JP3898296B2 - Pyrrolopyrazolopyrimidine compounds and pharmaceuticals containing the same as active ingredients - Google Patents

Pyrrolopyrazolopyrimidine compounds and pharmaceuticals containing the same as active ingredients Download PDF

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Publication number
JP3898296B2
JP3898296B2 JP23086297A JP23086297A JP3898296B2 JP 3898296 B2 JP3898296 B2 JP 3898296B2 JP 23086297 A JP23086297 A JP 23086297A JP 23086297 A JP23086297 A JP 23086297A JP 3898296 B2 JP3898296 B2 JP 3898296B2
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Japan
Prior art keywords
group
compound
pyrimidine
pyrazolo
nitro
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Expired - Fee Related
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JP23086297A
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Japanese (ja)
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JPH10120683A (en
Inventor
隆之 並木
雅之 湯浅
高▲桑▼貴子
聡 一ノ宮
幸雄 河津
兼一 岸井
宣夫 船山
真理子 原田
恭子 種田
直樹 檜山
知朗 八尋
真由美 杉尾
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Pola Chemical Industries Inc
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Pola Chemical Industries Inc
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Priority to JP23086297A priority Critical patent/JP3898296B2/en
Publication of JPH10120683A publication Critical patent/JPH10120683A/en
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Publication of JP3898296B2 publication Critical patent/JP3898296B2/en
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Expired - Fee Related legal-status Critical Current

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  • Nitrogen Condensed Heterocyclic Rings (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は新規なピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン化合物、この化合物の製造法及び製造中間体、並びにこの化合物を有効成分とする医薬に関する。
【0002】
【従来の技術】
喘息等に代表される呼吸器疾患の予防・治療は、現在、テオフィリンに代表されるキサンチン系気管支拡張剤による気管支拡張が主として行なわれており、その他には、塩酸エフェドリン等のベータ受容体興奮薬を対症的に用いる程度であった。
【0003】
しかしながら、上記の薬剤は、何れも副作用が大きく、問題であった。しかし、これらの薬剤に代わる優れた薬剤が見出されていないため、やむをえずこれらの薬剤を投与せざるを得なかった。
【0004】
一方、ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン骨格を有する化合物としては、3−シアノ−5−メチルピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン類に優れた血管拡張作用及び気管(支)拡張作用のあることが知られている(特公平6−88999号公報)。しかしながら、この化合物は血圧降下作用などの循環器に対する作用と気管(支)に対する作用の分離が困難であり、気管(支)に対して選択的に作用する薬剤の開発が望まれていた。
【0005】
【発明が解決しようとする課題】
従って本発明の目的は、副作用が少なく、呼吸器疾患の予防・治療効果に優れた医薬を提供することにある。
【0006】
【課題を解決するための手段】
斯かる実情に鑑み本発明者は、呼吸器疾患の予防・治療に有効な化合物を求めて、合成、スクリーニング等鋭意研究を行なったところ、下記一般式(1)で表される新規化合物又はその塩が、優れた気管(支)拡張作用及び気道収縮抑制作用を有し、かつ、循環器に対する作用が弱いので呼吸器疾患の予防・治療薬として有用であることを見出し本発明を完成した。
【0007】
すなわち本発明は、次の一般式(1)
【0008】
【化8】
【0009】
〔式中、R1は直鎖、分岐鎖若しくは環状のアルキル基を示し、R2は水素原子、ハロゲン原子、置換基としてヒドロキシ基又はジニトロベンジルオキシ基を有していてもよいアルキル基、置換基としてアルキル基を有していてもよいアミノ基、ピロリジノ基、ピペリジノ基、モルホリノ基、カルボキシル基、アルコキシカルボニル基又はカルバモイル基を示し、R3はニトロ基又はトリフルオロアセチル基を示す〕
で表されるピロロピラゾロピリミジン化合物又はその塩を提供するものである。
【0010】
また本発明は上記化合物(1)又はその塩を有効成分とする医薬を提供するものである。
【0011】
更に本発明は、上記化合物(1)又はその塩の製造法及び新規な製造中間体を提供するものである。
【0012】
【発明の実施の形態】
上記一般式(1)中、R1 で示される直鎖、分岐鎖又は環状のアルキル基としては炭素数1〜10のものが好ましく、炭素数2〜8のものがより好ましく、炭素数3〜7のものが特に好ましい。当該アルキル基のうち、直鎖又は分岐鎖のアルキル基としては、例えばメチル基、エチル基、n−プロピル基、イソプロピル基、n−ブチル基、イソブチル基、sec−ブチル基、tert−ブチル基、n−ペンチル基、イソペンチル基、tert−ペンチル基、1−エチルプロピル基、n−ヘキシル基、イソヘキシル基、n−ヘプチル基、n−オクチル基、n−ノニル基、n−デシル基等が挙げられるが、このうち、n−プロピル基、イソプロピル基、n−ブチル基、イソブチル基、sec−ブチル基、tert−ブチル基、n−ペンチル基、tert−ペンチル基(tert−アミル基)、1−エチルプロピル基、n−ヘキシル基、n−ヘプチル基が特に好ましい。また、当該環状アルキル基としては、シクロプロピル基、シクロブチル基、シクロペンチル基、シクロヘキシル基、シクロヘプチル基等が挙げられるが、このうちシクロプロピル基、シクロブチル基、シクロペンチル基及びシクロヘキシル基が特に好ましい。
【0013】
2 で示されるハロゲン原子としてはフッ素原子、塩素原子、臭素原子が挙げられ、このうちフッ素原子、塩素原子が好ましい。アルキル基としては、炭素数1〜10の直鎖又は分岐鎖のアルキル基が好ましく、炭素数1〜6の直鎖又は分岐鎖のアルキル基がより好ましい。当該アルキル基としては、メチル基、エチル基、n−プロピル基、イソプロピル基、n−ブチル基、イソブチル基、sec−ブチル基、tert−ブチル基、n−ペンチル基、n−ヘキシル基等が挙げられ、このうちメチル基、エチル基、イソプロピル基等が特に好ましい。置換基を有するアルキル基としては、アルコキシアルキル基、アラルキルオキシアルキル基、アリールオキシアルキル基、置換基を有していてもよいアミノアルキル基(例えばアミノアルキル基、モノ若しくはジ−アルキルアミノアルキル基、環を構成するヘテロ原子として更に酸素原子若しくは窒素原子を有していてもよい4〜7員の環状アミノ置換アルキル基)、ヒドロキシアルキル基が挙げられ、具体的にはメトキシメチル基、エトキシメチル基、ジニトロベンジルオキシメチル基、ベンジルオキシメチル基、フェノキシメチル基、アミノメチル基、メチルアミノメチル基、ジメチルアミノメチル基、モルホリノメチル基、ピペラジノメチル基、4−メチルピペラジノメチル基、ヒドロキシメチル基等が挙げられる。また置換基を有していてもよいアミノ基としては、アミノ基、モノ又はジアルキルアミノ基、環状アミノ基(例えば、環を構成するヘテロ原子として更に酸素原子又は窒素原子を有していてもよい4〜7員の環状アミノ基)、ハロゲン原子が置換していてもよいアルキルスルホニルアミノ基、アリールスルホニルアミノ基、アルキルカルボニルアミノ基、アリールカルボニルアミノ基、置換基を有していてもよいウレイド基、置換基を有していてもよいチオウレイド基、置換基を有していてもよいヒドラジノ基が挙げられる。ここでハロゲン原子としては、フッ素原子、塩素原子、臭素原子、ヨウ素原子が挙げられる。また、ウレイド基、チオウレイド基、ヒドラジノ基の置換基としては、R1 と同様な直鎖、分岐鎖又は環状のアルキル基等が挙げられる。置換基を有していてもよいアミノ基の具体例としては、アミノ基、メチルアミノ基、エチルアミノ基、ジメチルアミノ基、ジエチルアミノ基、シクロプロピルアミノ基、シクロブチルアミノ基、ピロリジノ基、ピペリジノ基、モルホリノ基、ピペラジノ基、メタンスルホニルアミノ基、トリフルオロメタンスルホニルアミノ基、ベンゼンスルホニルアミノ基、アセチルアミノ基、ベンゾイルアミノ基、ウレイド基、メチルウレイド基、チオウレイド基、メチルチオウレイド基、ヒドラジノ基、メチルヒドラジノ基等が挙げられる。またアルコキシカルボニル基としては、総炭素数2〜11のアルコキシカルボニル基が好ましく、総炭素数2〜7のアルコキシカルボニル基がより好ましい。当該アルコキシカルボニル基としては、メトキシカルボニル基、エトキシカルボニル基、イソプロピルオキシカルボニル基等が挙げられる。また、アルキルカルバモイル基としては、総炭素数2〜11のアルキルカルバモイル基が好ましく、総炭素数2〜7のアルキルカルバモイル基がより好ましい。当該アルキルカルバモイル基としては、メチルカルバモイル基、エチルカルバモイル基、イソプロピルカルバモイル基、ジメチルカルバモイル基、ジエチルカルバモイル基等が挙げられる。
【0017】
3 で示される基、ニトロ基又はトリフルオロアセチル基であり、このうちニトロ基が更に好ましい。
【0018】
化合物(1)の具体的な化合物としては、例えば、8−tert−ブチル−6,7−ジヒドロ−5−メチル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物1)、8−tert−アミル−6,7−ジヒドロ−5−メチル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物2)、8−シクロペンチル−6,7−ジヒドロ−5−メチル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物3)、8−シクロヘキシル−6,7−ジヒドロ−5−メチル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物4)、8−sec −ブチル−6,7−ジヒドロ−5−メチル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物5)、5−アミノ−8−シクロペンチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物19)、5−アミノ−8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物20)、エチル 8−シクロペンチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボキシレート(化合物21)、エチル 8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボキシレート(化合物22)、8−シクロペンチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボン酸(化合物23)、8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボン酸(化合物24)、8−tert−ブチル−6,7−ジヒドロ−5−メチル−3−トリフルオロアセチル−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物25)、8−tert−アミル−6,7−ジヒドロ−5−メチル−3−トリフルオロアセチル−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物26)、8−シクロペンチル−6,7−ジヒドロ−5−メチル−3−トリフルオロアセチル−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物27)、8−シクロヘキシル−6,7−ジヒドロ−5−メチル−3−トリフルオロアセチル−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物28)、8−sec −ブチル−6,7−ジヒドロ−5−メチル−3−トリフルオロアセチル−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物29)、8−tert−ブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物37)、8−シクロペンチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物38)、8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物39)、8−tert−ブチル−5−クロロ−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物40)、5−クロロ−8−シクロペンチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物41)、8−sec−ブチル−5−クロロ−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物42)、8−sec−ブチル−6,7−ジヒドロ−5−メトキシメチル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物43)、8−sec−ブチル−6,7−ジヒドロ−5−エトキシメチル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物44)、5−ベンジロキシメチル−8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物45)、8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−5−フェノキシメチル−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物46)、5−アミノメチル−8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物47)、8−sec−ブチル−6,7−ジヒドロ−5−メチルアミノメチル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物48)、8−sec−ブチル−6,7−ジヒドロ−5−ジメチルアミノメチル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物49)、8−sec−ブチル−6,7−ジヒドロ−5−モルホリノメチル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物50)、8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−5−ピペラジノメチル−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物51)、8−sec−ブチル−6,7−ジヒドロ−5−(4−メチルピペラジノメチル)−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物52)、8−sec−ブチル−6,7−ジヒドロ−5−ヒドロキシメチル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物53)、8−sec−ブチル−6,7−ジヒドロ−5−メチルアミノ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物54)、8−sec−ブチル−6,7−ジヒドロ−5−エチルアミノ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物55)、8−sec−ブチル−6,7−ジヒドロ−5−ジメチルアミノ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物56)、8−sec−ブチル−5−ジエチルアミノ−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物57)、8−sec−ブチル−5−シクロプロピルアミノ−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物58)、8−sec−ブチル−5−シクロブチルアミノ−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物59)、8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−5−ピロリジノ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物60)、8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−5−ピペリジノ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物61)、8−sec−ブチル−6,7−ジヒドロ−5−モルホリノ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物62)、8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−5−ピペラジノ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物63)、8−sec−ブチル−6,7−ジヒドロ−5−メタンスルホニルアミノ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物64)、8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−5−トリフルオロメタンスルホニルアミノ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物65)、5−ベンゼンスルホニルアミノ−8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物66)、5−アセチルアミノ−8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物67)、5−ベンゾイルアミノ−8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物68)、8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−5−ウレイド−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物69)、8−sec−ブチル−6,7−ジヒドロ−5−メチルウレイド−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物70)、8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−5−チオウレイド−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物71)、8−sec−ブチル−6,7−ジヒドロ−5−メチルチオウレイド−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物72)、8−sec−ブチル−6,7−ジヒドロ−5−ヒドラジノ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物73)、8−sec−ブチル−6,7−ジヒドロ−5−メチルヒドラジノ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物74)、8−sec−ブチル−5−カルバモイル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物75)、エチル 8−シクロプロピル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−e]ピリミジン−5−カルボキシレート(化合物76)、エチル 8−シクロブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボキシレート(化合物77)、エチル 6,7−ジヒドロ−8−イソプロピル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボキシレート(化合物78)、エチル 6,7−ジヒドロ−8−(1−エチルプロピル)−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボキシレート(化合物79)、8−シクロプロピル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボン酸(化合物80)、8−シクロブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボン酸(化合物81)、6,7−ジヒドロ−8−イソプロピル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボン酸(化合物82)、6,7−ジヒドロ−8−(1−エチルプロピル)−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボン酸(化合物83)、5−アミノ−8−シクロプロピル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物84)、5−アミノ−8−シクロブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物85)、5−アミノ−6,7−ジヒドロ−8−イソプロピル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物86)、5−アミノ−6,7−ジヒドロ−8−(1−エチルプロピル)−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物87)、8−sec−ブチル−6,7−ジヒドロ−5−(2′,4′−ジニトロベンジルオキシメチル)−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物88)等が例示できる。
【0019】
また、本発明で用いることのできる塩としては、生理的に許容しうるものであれば特段の限定はされず、例えば、塩酸、硫酸、硝酸、燐酸等の鉱酸塩、クエン酸、蓚酸、フマール酸、マレイン酸、ギ酸、酢酸、メタンスルホン酸、ベンゼンスルホン酸、パラトルエンスルホン酸等の有機酸塩、炭酸塩等が好ましく例示できる。
【0020】
また、本発明化合物(1)は、水和物等の溶媒和物も包含する。
【0021】
本発明の化合物(1)は、例えば、次の反応式に従って製造することができる。
【0022】
【化9】
【0023】
〔式中、R1 、R2 及びR3 は前記と同じものを示し、Xはハロゲン原子を示す〕
【0024】
すなわち、あらかじめ置換基(R2、R3 )を導入した化合物(3)又はその互変異性体に、塩化ホスホリル等のハロゲン化剤を反応させてジハロゲン体(2)とし、これにアミン類(NH2−R1)を反応させて閉環せしめれば化合物(1)を製造することができる。更に一般式(1)中のR1〜R3 の基を常法により種々の置換基に変換することもできる。また、化合物(3)を化合物(2)に変換した後に、R2 やR3 の置換基を他の置換基に変換し、その後化合物(1)としてもよい。
【0025】
ここで化合物(3)の互変異性体としては、次の構造のものが挙げられる。
【0026】
【化10】
【0027】
〔式中、R2 及びR3 は前記と同じものを示す〕
ここで化合物(3)は、次の方法(1)又は方法(2)により製造することができる。
【0028】
方法(1):
【0029】
【化11】
【0030】
〔式中、R2 及びR3 は前記と同じものを示す〕
すなわち、アミノピラゾール誘導体(4)とカルボニルラクトン誘導体(5)とをルイス酸等を触媒として縮合させ、必要に応じてアルカリ処理することにより閉環すれば化合物(3)を得ることができる。
【0031】
方法(2):
化合物(3)のR2 が水酸基である化合物(3−1)は次の反応式に従って製造することができる。
【0032】
【化12】
【0033】
〔式中、R3 は前記と同じものを示し、TBDMSiは、tert−ブチルジメチルシリル基を示し、Etはエチル基を示す〕
【0034】
すなわち、ブロモエタノールを、tert−ブチルジメチルシリルクロリドでt−ブチルジメチルシリル化した後、ナトリウムエトキシド等のアルカリの存在下、マロン酸ジエチルを縮合させ、次いでこれをアミノピラゾールと反応させれば、R2 が水酸基である化合物(3)を得ることができる。
【0035】
化合物(3)にハロゲン化試薬を作用させれば、ジハロゲン体(2)を得ることができる。ここで用いるハロゲン化試薬として特に限定されないが、例えばオキシ塩化リンなどが挙げられる。ハロゲン化試薬は化合物(3)に対して通常1.0〜10.0モル、好ましくは2.0〜5.0モル用いられる。反応に用いる溶媒は非水溶媒であれば、特に限定されず、具体的には、N,N−ジメチルホルムアミド、クロロホルム、ジクロロメタンなどが挙げられる。またハロゲン化試薬が液体の場合、無溶媒で反応を行うことも可能である。反応の進行を促進するために塩基性触媒の使用が可能である。また、窒素気流下反応させて行っても良い。反応温度については溶媒、ハロゲン化試薬、触媒の物性によって異なるが、加熱還流が好ましい。反応の後処理及び精製については一般的な方法に従って行えばよい。ただし、場合によりR2、R3 の分解に留意する必要がある。
なお、R2 が水酸基である化合物(3)にオキシハロゲン化リンを作用させると、R2 がハロゲン原子である化合物(2)を得ることができる。
そしてR2 及び/又はR3 を種々の置換基に変換することもできる。
【0036】
上記一般式(2)及び(3)の化合物を含む下記一般式(6)
【0037】
【化13】
【0038】
〔式中、Zは水酸基又はハロゲン原子を示し、Yは水酸基又はハロゲン原子を示し、R2 及びR3 は前記と同じ〕
で表されるピラゾロピリミジン誘導体又はその互変異性体は、新規化合物であり、本発明化合物(1)の製造中間体として重要な化合物である。
【0039】
この化合物(6)においてZは水酸基又は塩素原子、臭素原子、ヨウ素原子等のハロゲン原子を示すが、ハロゲン原子の中では塩素原子が好ましい。Yは水酸基又は上記のハロゲン原子を示すが、ハロゲン原子の中では塩素原子が好ましい。これらの化合物(6)を例示するならば、例えば、7−クロロ−6−(2−クロロエチル)−5−メチル−3−ニトロピラゾロ[1,5−a]ピリミジン、エチル 6−(2−ヒドロキシエチル)−5−メチルピラゾロ[1,5−a]ピリミジン−7(4H)−オン−3−カルボキシレート、エチル 7−クロロ−6−(2−クロロエチル)−5−メチルピラゾロ[1,5−a]ピリミジン−3−カルボキシレート、エチル 7−クロロ−6−(2−クロロエチル)−3−ニトロピラゾロ[1,5−a]ピリミジン−5−カルボキシレート、7−ブロモ−6−(2−ブロモエチル)−5−メチル−3−ニトロピラゾロ[1,5−a]ピリミジン、7−クロロ−6−(2−クロロエチル)−5−エチル−3−ニトロピラゾロ[1,5−a]ピリミジン、7−クロロ−6−(2−クロロエチル)−5−n−プロピル−3−ニトロピラゾロ[1,5−a]ピリミジン、7−クロロ−6−(2−クロロエチル)−5−イソプロピル−3−ニトロピラゾロ[1,5−a]ピリミジン、7−クロロ−6−(2−クロロエチル)−5−シクロプロピル−3−ニトロピラゾロ[1,5−a]ピリミジン、5−n−ブチル−7−クロロ−6−(2−クロロエチル)−3−ニトロピラゾロ[1,5−a]ピリミジン、5−t−ブチル−7−クロロ−6−(2−クロロエチル)−3−ニトロピラゾロ[1,5−a]ピリミジン、7−クロロ−6−(2−クロロエチル)−5−シクロペンチル−3−ニトロピラゾロ[1,5−a]ピリミジン、エチル 5−エチル−6−(2−ヒドロキシエチル)ピラゾロ[1,5−a]ピリミジン−7(4H)−オン−3−カルボキシレート、エチル 6−(2−ヒドロキシエチル)−5−n−プロピルピラゾロ[1,5−a]ピリミジン−7(4H)−オン−3−カルボキシレート、エチル 6−(2−ヒドロキシエチル)−5−イソプロピルピラゾロ[1,5−a]ピリミジン−7(4H)−オン−3−カルボキシレート、エチル 6−(2−ヒドロキシエチル)−5−シクロプロピルピラゾロ[1,5−a]ピリミジン−7(4H)−オン−3−カルボキシレート、エチル 5−n−ブチル−6−(2−ヒドロキシエチル)ピラゾロ[1,5−a]ピリミジン−7(4H)−オン−3−カルボキシレート、エチル 5−t−ブチル−6−(2−ヒドロキシエチル)ピラゾロ[1,5−a]ピリミジン−7(4H)−オン−3−カルボキシレート、エチル 6−(2−ヒドロキシエチル)−5−シクロペンチルピラゾロ[1,5−a]ピリミジン−7(4H)−オン−3−カルボキシレート、メチル 6−(2−ヒドロキシエチル)−5−メチルピラゾロ[1,5−a]ピリミジン−7(4H)−オン−3−カルボキシレート、n−プロピル 6−(2−ヒドロキシエチル)−5−メチルピラゾロ[1,5−a]ピリミジン−7(4H)−オン−3−カルボキシレート、t−ブチル 6−(2−ヒドロキシエチル)−5−メチルピラゾロ[1,5−a]ピリミジン−7(4H)−オン−3−カルボキシレート、エチル 7−ブロモ−6−(2−ブロモエチル)−5−メチルピラゾロ[1,5−a]ピリミジン−3−カルボキシレート、エチル 7−クロロ−6−(2−クロロエチル)−5−エチルピラゾロ[1,5−a]ピリミジン−3−カルボキシレート、エチル 7−クロロ−6−(2−クロロエチル)−5−n−プロピルピラゾロ[1,5−a]ピリミジン−3−カルボキシレート、エチル 7−クロロ−6−(2−クロロエチル)−5−イソプロピルピラゾロ[1,5−a]ピリミジン−3−カルボキシレート、エチル 7−クロロ−6−(2−クロロエチル)−5−シクロプロピルピラゾロ[1,5−a]ピリミジン−3−カルボキシレート、エチル 5−t−ブチル−7−クロロ−6−(2−クロロエチル)ピラゾロ[1,5−a]ピリミジン−3−カルボキシレート、メチル 7−クロロ−6−(2−クロロエチル)−5−メチルピラゾロ[1,5−a]ピリミジン−3−カルボキシレート、n−プロピル 7−クロロ−6−(2−クロロエチル)−5−メチルピラゾロ[1,5−a]ピリミジン−3−カルボキシレート、t−ブチル 7−クロロ−6−(2−クロロエチル)−5−メチルピラゾロ[1,5−a]ピリミジン−3−カルボキシレート、エチル 7−ブロモ−6−(2−ブロモエチル)−3−ニトロピラゾロ[1,5−a]ピリミジン−5−カルボキシレート、メチル 7−クロロ−6−(2−クロロエチル)−3−ニトロピラゾロ[1,5−a]ピリミジン−5−カルボキシレート、n−ブチル 7−クロロ−6−(2−クロロエチル)−3−ニトロピラゾロ[1,5−a]ピリミジン−5−カルボキシレート、t−ブチル 7−クロロ−6−(2−クロロエチル)−3−ニトロピラゾロ[1,5−a]ピリミジン−5−カルボキシレート、6−(2−クロロエチル)−5,7−ジクロロ−3−ニトロピラゾロ[1,5−a]ピリミジン、7−クロロ−6−(2−クロロエチル)−5−(2′,4′−ジニトロベンジルオキシメチル)−3−ニトロピラゾロ[1,5−a]ピリミジン等が挙げられる。
【0040】
本発明化合物(1)は、ジハロゲン体(2)に、アミン類〔NH2−R1〕を反応させ閉環せしめた後、所望によりR2 及び/又はR3 を種々の置換基に変換することにより製造することができる。
【0041】
ここでアミン類は、ジハロゲン体(2)に対して通常0.1〜10.0モル、好ましくは1.0〜2.5モル用いられる。反応の縮合剤としては3級有機アミン、無機塩基が用いられ、具体的に例示すればトリエチルアミン、N,N−ジイソプロピルエチルアミン、無水炭酸カリウム、無水炭酸ナトリウムなどが挙げられる。これらの縮合剤は一般式(2)で表される化合物に対して通常0.5〜30.0モル、好ましくは2.0〜5.0モル用いられる。また、原料アミンであるR1−NH2 を大過剰用いることにより縮合剤を不要とすることもできる。反応に用いる溶媒は2つの原料を溶解させることのできる非水溶媒であれば、特に限定されず、具体的には、N,N−ジメチルホルムアミド、クロロホルム、ジクロロメタンなどが挙げられる。溶媒の使用量は、具体的にはこれら原料化合物に対して5〜100倍量あればよい。またこれらの溶媒は単独で用いることも可能であるし、2種以上を組み合わせて用いることも可能である。溶媒の選択は、原料化合物及び縮合剤の物性に適合させて行えばよい。本製造法の反応温度については室温〜沸点付近の温度まで何れの温度でも良いが、好ましいのは室温である。本製造法の反応時間は種々の条件により異なるが30分〜30日間を要する。反応の後処理と精製法については一般的な方法、例示すれば水によるクエンチ、溶媒抽出、カラムクロマトグラフィー、再結晶等を適切に組み合わせてやればよい。一般式(1)で表される化合物が得られた後に置換基R2 、R3 に関しては還元、加水分解等の様々な化学変換を行うことが可能である。
【0042】
化合物(1)は、極性又は非極性溶媒中で酸と混合する等の常法により塩とすることができる。
かくして得られた化合物(1)又はその塩は、カラムクロマトグラフィーや再結晶などの通常の方法により、精製することができる。
【0043】
化合物(1)又はその塩は、後記試験例に示すように優れた気管支拡張作用及び気道収縮抑制作用を有し、かつ循環器系に及ぼす作用が弱いので、気管支喘息、慢性閉塞性肺疾患、気管支炎、肺炎等の呼吸器系疾患治療・予防用の医薬として有用である。
【0044】
化合物(1)又はその塩はそれ自体で医薬として用いることもできるが、通常医薬として用いられている種々の剤型(組成物)とすることもできる。この様な剤型としては、インハレーション剤、注射剤、経口投与剤、経直腸投与剤等が挙げられる。
【0045】
これらの剤型の本発明の医薬には、化合物(1)又はその塩以外に通常製剤化のために用いられている任意成分を含有することができる。この様な任意成分としては、例えば、賦形剤、結合剤、被覆剤、滑沢剤、糖衣剤、崩壊剤、増量剤、矯味矯臭剤、乳化・可溶化・分散剤、安定剤、pH調整剤、等張剤等が例示できる。また、本発明の医薬はこれら以外に通常呼吸器疾患の治療や予防で用いられている既知の薬物、例えば、テオフィリン等を含有することも可能である。本発明の医薬は、これらの成分を用いて常法に従って製造することができる。
【0046】
本発明の医薬の好ましい投与量は、症状、疾病の種類、性別、年齢、体格等によって異なるが、化合物(1)又はその塩として一般的に成人1日あたり1〜1000mgが好ましく、これを1日一回ないし数回に分けて投与することが好ましい。
【0047】
【発明の効果】
本発明化合物(1)又はその塩は、優れた気管(支)拡張作用及び気道収縮抑制作用を有し、しかも循環器系に対する作用が弱いので喘息、慢性閉塞性肺疾患、気管支炎、肺炎等の呼吸器疾患の予防・治療に有用である。
【0048】
【実施例】
以下、実施例を挙げて更に詳細に本発明を説明するが本発明はこれらに限定されるものではない。但し、化合物6〜18、及び化合物30〜36は、あくまで参考例として記載したものであり、本発明の技術的範囲に属するものではない。
【0049】
参考例1
3−{[1−(テトラヒドロ−2−オキソ−3−フリル)エチリデン]アミノ}ピラゾールの製造:
3−アミノピラゾール0.83g(10.00mmol)、2−アセチル−γ−ブチロラクトン1.92g(15.00mmol)を乾燥エタノール12mlに溶解し、これに室温で攪拌しながら、ボロントリフルオリドメタノールコンプレックス0.1mlを加え、続いて同条件下で4時間攪拌した。析出してきた固体を濾取し、エタノールで洗い、風乾し、目的物を1.34g(収率69.4%)得た。
【0050】
1H−NMR(DMSO−d6,ppm)
2.45(3H,s),2.86(2H,t,J=7.8Hz),4.27(2H,t,J=7.8Hz),6.07(1H,d,J=2.2Hz),6.67(1H,d,J=2.2Hz),10.00(1H,s),12.46(1H,brs)
【0051】
参考例2
6−(2−ヒドロキシエチル)−5−メチルピラゾロ[1,5−a]ピリミジン−7(4H)−オンの製造:
3−{[1−(テトラヒドロ−2−オキソ−3−フリル)エチリデン]アミノ}ピラゾール1.17g(6.04mmol)を水7.5mlに懸濁し、これにトリエチルアミン0.73g(7.23mmol)を加え、油浴温100℃にて2時間攪拌した。その後、氷−水で冷却し、攪拌しながら濃塩酸を加え、pH2付近とし(固体析出)、更に飽和重曹水を加えてpH4付近とした。不溶固体を濾取し、水で数回洗い、風乾し、目的物を1.06g(収率90.6%)得た。
【0052】
1H−NMR(CDCl3+CD3OD,ppm)
2.38(3H,s),2.81(2H,t,J=6.5Hz),3.74(2H,t,J=6.5Hz),5.97(1H,d,J=2.0Hz),7.80(1H,d,J=2.0Hz)
【0053】
参考例3
7−クロロ−6−(2−クロロエチル)−5−メチルピラゾロ[1,5−a]ピリミジンの製造:
6−(2−ヒドロキシエチル)−5−メチルピラゾロ[1,5−a]ピリミジン−7(4H)−オン5.30g(27.46mmol)にトリエチルアミン8.5ml(d=0.726,61.10mmol)を加え、これに氷冷、窒素雰囲気下攪拌しながらオキシ塩化リン8.5ml(d=1.645,91.19mmol)を2分要し滴下し、続いて油浴温100℃にて1時間攪拌した。その後氷−水で冷却し、反応液をクロロホルム100mlに溶かし、氷−水500mlに注いだ。よく振とう後、クロロホルム層を分離し、水層は更にクロロホルムで抽出し(100ml×2)、全クロロホルム層は合わせて硫酸ナトリウム乾燥後、溶媒留去した。残渣をシリカゲルカラムクロマトグラフィー(クロロホルム)に付し、目的物を3.78g(収率59.8%)得た。
【0054】
1H−NMR(CDCl3,ppm)
2.71(3H,s),3.35(2H,t,J=7.5Hz),3.76(2H,t,J=7.5Hz),6.67(1H,d,J=2.4Hz),8.15(1H,d,J=2.4Hz)
【0055】
実施例1
7−クロロ−6−(2−クロロエチル)−5−メチル−3−ニトロピラゾロ[1,5−a]ピリミジンの製造:
濃硫酸46mlに氷−水−塩系で冷却下、窒素雰囲気下攪拌しながら90%硝酸23mlを3分30秒要して滴下し、続いて−5℃付近で攪拌しながら7−クロロ−6−(2−クロロエチル)−5−メチルピラゾロ[1,5−a]ピリミジン5.0g(21.74mmol)を固体のまま少しずつ10分30秒要して加え、−5〜5℃で5時間攪拌した。その後氷−水800mlに反応液を注ぎ、約45分攪拌し、析出してきた固体を濾取し、水で数回洗い、風乾し、目的物を5.65g(収率94.5%)得た。
【0056】
m.p.
172.1〜174.2℃
IR(KBr錠剤、cm-1
1620,1502,1481,1403,1383,1315,1213
1H−NMR(CDCl3,ppm)
2.91(3H,s),3.43(2H,t,J=7.0Hz),3.83(2H,t,J=7.0Hz),8.80(1H,s)
【0057】
実施例2
化合物1(R1:tert−ブチル、R2:メチル、R3:ニトロ)の製造:
8−tert−ブチル−6,7−ジヒドロ−5−メチル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジンの製造:
7−クロロ−6−(2−クロロエチル)−5−メチル−3−ニトロピラゾロ[1,5−a]ピリミジン1.75g(6.36mmol)を乾燥ジメチルホルムアミド18mlに溶解し、これにtert−ブチルアミン0.93g(12.72mmol)、トリエチルアミン1.61g(15.94mmol)を順次加え室温で6時間攪拌した。その後反応液を水に注ぎ、酢酸エチルで抽出した(150ml×2)。全酢酸エチル層を合わせて飽和食塩水で洗い、硫酸マグネシウムで乾燥後、溶媒留去した。残渣をシリカゲルカラムクロマトグラフィー(ヘキサン:酢酸エチル=2:1)に付し、エタノールより再結晶し、目的物を0.78g(収率44.6%)得た。
【0058】
1H−NMR(CDCl3,ppm)
1.71(9H,s),2.47(3H,s),3.06(2H,t,J=9.2Hz),4.09(2H,t,J=9.2Hz),8.61(1H,s)
【0059】
実施例3
化合物2(R1:tert−アミル、R2:メチル、R3:ニトロ)の製造:
7−クロロ−6−(2−クロロエチル)−5−メチル−3−ニトロピラゾロ[1,5−a]ピリミジンとtert−アミルアミンより実施例2と同様に化合物2を収率37.8%で得た。
【0060】
1H−NMR(CDCl3,ppm)
0.89(3H,t,J=7.6Hz),1.64(6H,s),2.27(2H,q,J=7.6Hz),2.47(3H,s),3.07(2H,t,J=9.0Hz),4.09(2H,t,J=9.0Hz),8.59(1H,s)
【0061】
実施例4
化合物3(R1:シクロペンチル、R2:メチル、R3:ニトロ):
7−クロロ−6−(2−クロロエチル)−5−メチル−3−ニトロピラゾロ[1,5−a]ピリミジンとシクロペンチルアミンより実施例2と同様に化合物3を収率82.9%で得た。
【0062】
IR(KBr錠剤、cm-1
1626,1617,1492,1394,1234,1196
m.p.
228〜234℃
1H−NMR(CDCl3,ppm)
1.60〜1.85(6H,m),1.90〜2.10(2H,m),2.46(3H,s),3.16(2H,t,J=8.9Hz),3.92(2H,t,J=8.9Hz),5.81(1H,m),8.56(1H,s)
【0063】
実施例5
化合物4(R1:シクロヘキシル、R2:メチル、R3:ニトロ)の製造:
7−クロロ−6−(2−クロロエチル)−5−メチル−3−ニトロピラゾロ[1,5−a]ピリミジンとシクロヘキシルアミンより実施例2と同様に化合物4を収率76.6%で得た。
【0064】
IR(KBr錠剤、cm-1
1622,1613,1491,1454,1441,1397,1245,1231,1199
m.p.
256.8〜258.1℃
1H−NMR(CDCl3,ppm)
1.00〜1.30(1H,m),1.35〜2.00(9H,m),2.46(3H,s),3.14(2H,t,J=9.0Hz),3.91(2H,t,J=9.0Hz),5.15〜5.35(1H,m),8.57(1H,s)
【0065】
実施例6
化合物5(R1:sec −ブチル、R2:メチル、R3:ニトロ)の製造:
7−クロロ−6−(2−クロロエチル)−5−メチル−3−ニトロピラゾロ[1,5−a]ピリミジンとsec−ブチルアミンより実施例2と同様に化合物5を収率74.3%で得た。
【0066】
IR(KBr錠剤、cm-1
1626,1614,1488,1443,1397,1229,1200,1180
m.p.
257.9〜260.1℃
1H−NMR(CDCl3,ppm)
0.94(3H,t,J=7.4Hz),1.31(3H,d,J=6.8Hz),1.55〜1.75(2H,m),2.48(3H,s),3.17(2H,t,J=9.2Hz),3.73〜3.95(2H,m),5.50〜5.68(1H,m),8.58(1H,s)
【0067】
実施例7
化合物6(R1:シクロペンチル、R2:メチル、R3:アミノ)の製造:
化合物3を0.287g秤取り、これに無水塩化スズ(II)0.95g及び乾燥エタノール2mlを加え、窒素雰囲気下70〜80℃で1時間50分撹拌した。氷水で冷却し、水冷撹拌下酢酸エチル20mlと飽和重層水30mlをそそぎ込み、不溶物を除去し酢酸エチルで数回洗浄し、濾液と合わせ酢酸エチル層を分離し、水層を更に酢酸エチルで抽出し、酢酸エチル層をすべて合わせて、硫酸ナトリウムで乾燥させた後、溶媒を溜去し、残渣を酢酸エチルより再結晶し、化合物6を0.114g(収率44.4%)得た。
【0068】
IR(KBr錠剤、cm-1
3378,1578,1561,1332
m.p.
134〜134.5℃
1H−NMR(CDCl3,ppm)
1.55〜1.80(6H,m),1.80〜2.05(2H,m),2.35(3H,s),3.07(2H,t,J=9.0Hz),3.77(2H,t,J=9.0Hz),5.88〜6.05(1H,m),7.70(1H,s)
【0069】
実施例8
化合物7(R1:シクロペンチル、R2:メチル、R3:アセチルアミノ)の製造:
化合物3を0.20g秤取り、酢酸1.8mlに溶かし、還元鉄0.13gを個体のまま一度に加え、続いて窒素雰囲気下、100℃で1時間30分加熱撹拌した。その後酢酸を溜去し、残渣にクロロホルム10mlを加え、これを飽和重曹水30mlに注いだ。不溶物を濾去し濾液のクロロホルム層を分離した。水層は更にクロロホルムで抽出し、全クロロホルム層を合わせて、硫酸ナトリウムで乾燥後溶媒を溜去し、化合物7を0.20g(収率95.2%)得た。
【0070】
IR(KBr錠剤、cm-1
3234,1633,1582,1558,1530,1329,1250,1166
m.p.
233〜234℃
1H−NMR(CDCl3,ppm)
1.60〜1.80(6H,m),1.85〜2.05(2H,m),2.19(3H,s),2.33(3H,s),3.08(2H,t,J=9.2Hz),3.82(2H,t,J=9.2Hz),5.93〜6.10(1H,m),8.28(1H,brs),8.58(1H,s)
【0071】
実施例9
化合物8(R1:シクロペンチル、R2:メチル、R3:トリフルオロメタンスルホニルアミノ)の製造:
化合物6 0.1gを2mlの乾燥塩化メチレンに溶かし、氷水冷下窒素雰囲気で、撹拌しながら、トリフルオロメタンスルホン酸無水物0.13gを2mlの乾燥塩化メチレンに溶かしたものを滴下し、このまま25分間撹拌を続けた。クロロホルム−冷飽和重曹水に注ぎ、クロロホルム層を分離し、硫酸ナトリウムで乾燥後溶媒を溜去し、残渣をシリカゲルカラムクロマトグラフィー(クロロホルム:メタノール=100:0→100:1)で精製し、化合物8を0.13g(収率86.7%)得た。
【0072】
IR(KBr錠剤、cm-1
1636,1300,1203,1163
m.p.
178〜179℃
1H−NMR(CDCl3,ppm)
1.62〜1.87(6H,m),1.90〜2.10(2H,m),2.37(3H,s),3.11(2H,t,J=8.6Hz),3.96(2H,t,J=8.6Hz),5.95〜6.10(1H,m),7.98(1H,s)
【0073】
実施例10
化合物9(R1:シクロペンチル、R2:メチル、R3:トリフルオロアセチルアミノ)の製造:
化合物6 0.257gを4.5mlの乾燥ピリジンに溶かし、窒素雰囲気下、室温で撹拌しながら、トリフルオロ酢酸無水物の0.42mlを滴下し、このまま1時間10分撹拌した。反応液を減圧濃縮し、残渣をクロロホルム20mlに溶解させ、これを水30mlに注いだ。飽和重曹水でアルカリ性にした後、クロロホルム層を分離した。硫酸ナトリウム乾燥後、溶媒留去した。残渣を酢酸エチルより再結晶し化合物9を0.129g(収率36.5%)得た。
【0074】
IR(KBr錠剤、cm-1
1702,1628,1605,1318,1307,1209,1192,1154
m.p.
175〜176℃
1H−NMR(CDCl3,ppm)
1.60〜1.85(6H,m),1.85〜2.10(2H,m),2.33(3H,s),3.10(2H,t,J=9.2Hz),3.85(2H,t,J=9.2Hz),5.90〜6.08(1H,m),8.63(1H,s)
【0075】
実施例11
化合物10(R1:シクロペンチル、R2:メチル、R3:メタンスルホニルアミノ)の製造:
0.14gの化合物6を2mlの乾燥塩化メチレンに溶かし、氷冷窒素雰囲気下、撹拌しながら、トリエチルアミン0.2mlを加え、更にメタンスルホニルクロリド75mgの2ml乾燥塩化メチレン溶液を滴下した。氷冷窒素雰囲気下で30分撹拌しクロロホルム5ml、冷水30mlに注ぎ、クロロホルム層を分離し、硫酸ナトリウムで乾燥させた後、溶媒を留去し、シリカゲルカラムクロマトグラフィー(溶出溶媒:クロロホルム)で精製しエタノールより再結晶して、化合物10を0.105g(収率58.3%)得た。
【0076】
IR(KBr錠剤、cm-1
1618,1595,1542,1323,1149
m.p.
172〜174℃
1H−NMR(CDCl3,ppm)
1.60〜1.85(6H,m),1.85〜2.05(2H,m),2.35(3H,s),3.04(3H,s),3.08(2H,t,J=9.9Hz),3.82(2H,t,J=9.9Hz),5.90〜6.05(1H,m),8.04(1H,s)
【0077】
実施例12
化合物12(R1:シクロペンチル、R2:メチル、R3:エチルオキサリルアミノ)の製造:
0.257gの化合物6を4mlの乾燥塩化メチレンに溶かし、氷冷窒素雰囲気下、撹拌しながら、トリエチルアミン0.37mlを加え、更にエチルオキサリルクロリド164mgの2ml乾燥塩化メチレン溶液を滴下した。氷冷窒素雰囲気下で60分撹拌しクロロホルム10ml、冷水50mlに注ぎ、クロロホルム層を分離し、硫酸ナトリウムで乾燥させた後、溶媒を留去し、シリカゲルカラムクロマトグラフィー(溶出溶媒:クロロホルム)で精製しエタノールより再結晶して、化合物12を0.271g(収率75.9%)得た。
【0078】
IR(KBr錠剤、cm-1
3400,1764,1702,1625,1609,1504
m.p.
185〜186℃
1H−NMR(CDCl3,ppm)
1.43(3H,t,J=7.0Hz),1.60〜1.85(6H,m),1.85〜2.05(2H,m),2.35(3H,s),3.10(2H,t,J=9.0Hz),3.83(2H,t,J=9.0Hz),4.42(2H,q,J=7.0Hz),5.90〜6.06(1H,m),8.69(1H,s),9.32(1H,brs)
【0079】
実施例13
化合物11(R1:シクロペンチル、R2:メチル、R3:オキサリルアミノ)の製造:
化合物12の0.34gをメタノール6.8mlに懸濁し、これに氷冷窒素雰囲気下撹拌しながら1N−水酸化ナトリウム水溶液1.3mlを加え、氷冷窒素雰囲気下撹拌を1時間続けた。更に、水6mlを加え、室温で8時間30分撹拌した。メタノール20mlを加え撹拌した後、不溶物を濾取し乾燥させ300mlの熱エタノールに溶解させ濾過し、溶媒を留去した後エタノール15mlを加え、更に1N−塩化水素水溶液を加えてpHを3付近とした。析出固体を濾取し、乾燥させて化合物11を0.17g(収率54.8%)得た。
【0080】
IR(KBr錠剤、cm-1
3235,2800〜2350,1681,1625,1547,1496,1346,1296,1173
m.p.
255〜255.5℃
【0081】
実施例14
化合物13(R1:tert−ブチル、R2 :メチル、R3:N−(1H−テトラゾール−5−イル)カルボキサミド)の製造:
後記実施例に記載の化合物34を380mg秤取り、乾燥DMF3mlを加え、これに280mgの1,1′−カルボニルジイミダゾールを加え、90℃で30分撹拌し、結晶が溶解した状態で5−アミノ−1H−テトラゾール170mgを加えた。更に90℃で3時間撹拌を行い、その後反応液を0℃に冷却し、水を加えた後、濃塩酸にて、酸性にした。その後、飽和炭酸水素ナトリウム水溶液にて反応液を中和し、析出した結晶を濾取し乾燥させた。この結晶をクロロホルムで洗浄し、更に乾燥させ、化合物13を180mg得た。(収率38.2%)
【0082】
IR(KBr錠剤、cm-1
1667,1580,1502,1303,1201
1H−NMR(DMSO−d6,ppm)
1.50(9H,s),2.31(3H,s),2.84(2H,t,J=8.9Hz),3.95(2H,t,J=8.9Hz),8.42(1H,s),11.59(1H,s),15.80(1H,brs)
【0083】
実施例15
化合物14(R1:tert−アミル、R2:メチル、R3:N−(1H−テトラゾール−5−イル)カルボキサミド)の製造:
後記実施例に記載の化合物35 400mgより、実施例14と同様に化合物14を280mg(収率60.0%)得た。
【0084】
IR(KBr錠剤、cm-1
1666,1578,1501,1297,1200
1H−NMR(DMSO−d6,ppm)
0.90(3H,t,J=7.3Hz),1.67(6H,s),2.33(2H,q,J=7.3Hz),2.45(3H,s),3.09(2H,t,J=8.9Hz),4.13(2H,t,J=8.9Hz),8.46(1H,s),11.89(1H,s),15.60(1H,brs)
【0085】
実施例16
化合物15(R1:シクロペンチル、R2:メチル、R3:1H−テトラゾール−5−イル)の製造:
3−シアノ−8−シクロペンチル−5−メチル−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン1.62g、アジ化ナトリウム0.45g,酢酸アンモニウム0.51gに乾燥DMF21mlを加え、窒素雰囲気下160℃で9時間撹拌した。途中適宜アジ化ナトリウム0.45gと酢酸アンモニウム0.51gを加えた。氷水冷下撹拌しながら水30mlを加え、濃塩酸を加えpHを1とした後、飽和重曹水でpH4〜5にした。クロロホルムで抽出し乾燥後濃縮し、シリカゲルカラムクロマトグラフィー(溶出溶媒クロロホルム:メタノール=10:0→30:1)で精製し、化合物15を0.54g(収率28.7%)得た。
【0086】
IR(KBr錠剤、cm-1
1625,1581,1322,1259,1201
m.p.
266.5℃〜267.5℃
1H−NMR(CDCl3,ppm)
1.60〜1.85(6H,m),1.85〜2.10(2H,m),2.40(3H,s),3.14(3H,t,J=9.2Hz),3.90(3H,t,J=9.2Hz),5.54(1H,brs),5.80〜6.00(1H,m),8.57(1H,s)
【0087】
実施例17
化合物16(R1:tert−ブチル、R2:メチル、R3:1H−テトラゾール−5−イル)の製造:
8−tert−ブチル−3−シアノ−5−メチル−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン1.38gより実施例16と同様にして化合物16を0.42g(収率26.1%)得た。
【0088】
IR(KBr錠剤、cm-1
1627,1560,1245,1196
m.p.
270℃
1H−NMR(CDCl3:DMSO−d6=4:1,ppm)
1.75(9H,s),2.46(3H,s),3.06(2H,t,J=8.9Hz),4.08(2H,t,J=8.9Hz),5.90(1H,brs),8.51(1H,s)
【0089】
実施例18
化合物17(R1:tert−アミル、R2:メチル、R3:1H−テトラゾール−5−イル)の製造:
8−tert−アミル−3−シアノ−5−メチル−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン1.40gより実施例16と同様にして化合物17を0.46g(収率28.4%)得た。
【0090】
IR(KBr錠剤、cm-1
1633,1569,1256,1186
m.p.
246℃
1H−NMR(DMSO−d6,ppm)
0.86(3H,t,J=7.3Hz),1.64(6H,s),2.31(2H,q,J=7.3Hz),2.40(3H,s),3.04(2H,t,J=8.7Hz),4.09(2H,t,J=8.7Hz),8.54(1H,s)
【0091】
実施例19
化合物18(R1:シクロペンチル、R2:メチル、R3:カルボキサミド)の製造:
3−シアノ−8−シクロペンチル−6,7−ジヒドロ−5−メチル−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン0.53gにエタノール2mlを加え、更に水2mlに溶解させた水酸化ナトリウム0.58gを加え、窒素雰囲気下8時間加熱還流した。冷却後、水30mlを加え、不溶固体を濾取し、風乾して化合物18を0.33g(収率57.9%)得た。
【0092】
IR(KBr錠剤、cm-1
3334,3135,1656,1616,1590,1518,1465,1330,1259,1196
m.p.
280℃以上
1H−NMR(CDCl3,ppm)
1.58〜1.85(6H,m),1.85〜2.05(2H,m),2.35(3H,s),3.11(3H,t,J=8.9Hz),3.85(3H,t,J=8.9Hz),5.45(1H,brs),5.85〜6.00(1H,m),8.36(1H,brs),8.45(1H,s)
【0093】
実施例20
化合物19(R1:シクロペンチル、R2:アミノ、R3:ニトロ)の製造:
後記実施例に記載の化合物23の1.2gを18mlの乾燥アセトンに懸濁させ、氷冷窒素雰囲気下撹拌しながらトリエチルアミン0.65mlを加えた。続いてクロロ炭酸エチル0.47gを2mlの乾燥アセトンに溶解させ、滴下し1時間攪拌した。このままの条件下でアジ化ナトリウム0.54gを水2mlに溶かして滴下し1時間撹拌を続けた後、2時間放置した。この反応物を水200mlに注ぎ、不溶物を濾取し、水で洗った。これをトルエン25mlに懸濁させ125℃で4時間加熱撹拌した。これを氷水で冷却後、クロロホルム120mlを加え溶解し、硫酸ナトリウムで乾燥させた後濃縮した。残渣をシリカゲルカラムクロマトグラフィー(溶出溶媒;クロロホルム:メタノール=100:0→100:1)で精製し濃縮した。残渣をクロロホルム100mlに溶解させ、1N−塩酸で抽出した。塩酸層は重曹にてアルカリ性にし、クロロホルムで抽出し化合物19を0.74g(収率67.9%)得た。
【0094】
IR(KBr錠剤、cm-1
3487,3310,3210,1624,1583,1400,1258,1214
m.p.
279〜280℃
1H−NMR(CDCl3,ppm)
1.60〜1.85(6H,m),1.85〜2.05(2H,m),2.97(2H,t,J=8.9Hz),3.86(3H,t,J=8.9Hz),5.60〜5.80(1H,m),5.72(2H,brs),8.42(1H,s)
【0095】
実施例21
化合物20(R1:sec−ブチル、R2:アミノ、R3:ニトロ)の製造:
後記実施例に記載の化合物24を原料として、実施例20と同様の操作で化合物20を製造した。収率45.8%
【0096】
IR(KBr錠剤、cm-1
1640,1625,1580,1399,1256
m.p.
201.5〜203.1℃
1H−NMR(CDCl3,ppm)
0.92(3H,t,J=7.6Hz),1.25(3H,d,J=6.5Hz),1.45〜1.75(2H,m),2.98(2H,t,J=8.9Hz),3.79(2H,s,J=8.9Hz),5.41(1H,s,J=6.5Hz),6.14(2H,brs),8.40(1H,s)
【0097】
参考例4
エチル(テトラヒドロ−2−オキソ−3−フリル)グリオキシレートの製造:
モレキャラーシーブス乾燥済エタノール500mlに金属ナトリウム25.80gを加えて溶解させた。次いで、蓚酸ジエチル148.21gを加え、反応系を−15〜−10℃に冷却した。この温度を保ちながらγ−ブチロラクトン88.79gのエタノール60ml溶液を滴下し、2時間攪拌を行った後、室温で16時間攪拌を行った。反応液は氷水1Lにあけ、濃塩酸でpH=4〜5に調整し、クロロホルム抽出を行った。クロロホルム層は無水硫酸ナトリウムにて乾燥を行い、溶媒を減圧留去した。ここで得られた粗生成物を減圧蒸留し、150〜160℃(5〜6mmHg)の留分を目的物として得た。微黄色液体156.21g。収率83.1%。
【0098】
1H−NMR(CDCl3,ppm)
1.39(3H,t,J=7.4Hz),3.30(2H,t,J=7.4Hz),4.37(2H,q,J=7.4Hz),4.50(2H,t,J=7.4Hz),10.92(1H,br)
【0099】
実施例22
エチル 7−クロロ−6−(2−クロロエチル)−3−ニトロピラゾロ[1,5−a]ピリミジン−5−カルボキシレートの製造:
3−アミノピラゾール8.12g(97.70mmol)の32ml酢酸溶液に室温で攪拌しながら合成ゼオライトA−4パウダー8.12gを加え、更に氷冷攪拌下、参考例4で得たエチル(テトラヒドロ−2−オキソ−3−フリル)グリオキシレート8.19g(97.78mmol)の40ml酢酸溶液を2分要し滴下し、続いて室温で4時間攪拌した。その後、不溶物を濾去し、濾液を減圧濃縮した。残渣をクロロホルム150mlに溶解し、水700mlに注ぎ、よく振とう後クロロホルム層を分離し、水層は更にクロロホルムで抽出し(150ml×2)、全クロロホルム層は合わせて硫酸ナトリウム乾燥後溶媒留去した。残渣をシリカゲルカラムクロマトグラフィー(クロロホルム)に付し、精製しエチル 6−(2−ヒドロキシエチル)ピラゾロ[1,5−a]ピリミジン−7(4H)−オン−5−カルボキシレートを5.36g得た。これにオキシ塩化リン7ml(d=1.645,75.10mmol)を加え、窒素雰囲気下、油浴温100℃で40分攪拌し、続いて室温付近まで冷却し、これにトリエチルアミン7ml(d=0.726,50.32mmol)を加えて、油浴温100℃で30分攪拌した。その後氷−水で冷却し、クロロホルム100mlを加えて、氷−水600mlに注ぎ、よく振とう後にクロロホルム層を分離し、水層は更にクロロホルムで抽出し(100ml×2)、全クロロホルム層は合わせて、硫酸マグネシウム乾燥後、溶媒留去した。残渣をシリカゲルカラムクロマトグラフィー(クロロホルム)に付し、エチル 7−クロロ−6−(2−クロロエチル)ピラゾロ[1,5−a]ピリミジン−5−カルボキシレートを3.60g得た。無水酢酸14.2mlに氷冷攪拌下90%硝酸1.60ml、濃硫酸1滴を順次加え、続いて−10℃に冷却した。これにエチル 7−クロロ−6−(2−クロロエチル)ピラゾロ[1,5−a]ピリミジン−5−カルボキシレート3.60gの4.30ml無水酢酸溶液を−5〜0℃に保ちながら滴下した。同条件下で20分攪拌した後、氷−水300mlに注ぎ、酢酸エチル400mlで抽出した。有機層を飽和重曹水で2回、飽和食塩水で1回洗浄し、硫酸マグネシウムで乾燥後、溶媒留去した。残渣をシリカゲルカラムクロマトグラフィー(酢酸エチル:n−ヘキサン=1:5、クロロホルム)に付し、目的物を2.49g(収率7.6%)得た。
【0100】
1H−NMR(CDCl3,ppm)
1.49(3H,t,J=7.3Hz),3.61(2H,t,J=7.0Hz)、3.85(2H,t,J=7.0Hz),4.56(2H,q,J=7.3Hz),8.93(1H,s)
【0101】
実施例23
エチル 8−シクロペンチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボキシレートの製造(化合物21)(その1):
エチル 7−クロロ−6−(2−クロロエチル)−3−ニトロピラゾロ[1,5−a]ピリミジン−5−カルボキシレート1.16g(3.48mmol)を乾燥ジメチルホルムアミド12mlに溶解し、シクロペンチルアミン2.4ml(d=0.863,24.32mmol)を加え、室温で4時間攪拌した。その後、反応液を氷−水に注ぎ、不溶固体を濾取し、水で洗い、風乾し、目的物を1.15g(収率95.7%)得た。
【0102】
1H−NMR(CDCl3,ppm)
1.47(3H,t,J=7.3Hz),1.65〜1.90(6H,m),1.95〜2.15(2H,m),3.58(2H,t,J=8.9Hz)、4.00(2H,t,J=8.9Hz),4.46(2H,q,J=7.3Hz),5.85〜6.05(1H,m),8.67(1H,s)
【0103】
実施例24
化合物21(R1:シクロペンチル、R2:エトキシカルボニル、R3:ニトロ)の製造(その2):
エチル 7−クロロ−6−(2−クロロエチル)ピラゾロ[1,5−a]ピリミジン−5−カルボキシレート3.6gを乾燥DMF48mlに溶解させ、窒素雰囲気下室温で撹拌しながら、シクロペンチルアミン7.3mlを加え1時間20分撹拌した。反応物を氷水250mlに注ぎ、不溶物を濾取し、風乾してエチル 8−シクロペンチル−6,7−ジヒドロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボキシレートを3.20g(収率85.3%)得た。この1.16gを、濃硫酸7.8mlと90%硝酸3.9mlを混合して調整した混酸に−5〜0℃で撹拌しながら少しずつ加えた。5分間同条件下で攪拌した後反応液を氷水200mlに注ぎ、クロロホルムにて抽出した。クロロホルム層は、硫酸ナトリウムで乾燥した後溶媒留去し、残渣をシリカゲルカラムクロマトグラフィー(酢酸エチル:n−ヘキサン=1:1)で精製し化合物21を0.76g(収率57.0%)得た。
【0104】
1H−NMR(CDCl3,ppm)
1.47(3H,t,J=7.3Hz),1.65〜1.90(6H,m),1.95〜2.15(2H,m),3.58(2H,t,J=8.9Hz),4.00(2H,t,J=8.9Hz),4.46(2H,q,J=7.3Hz),5.85〜6.05(1H,m),8.67(1H,s)
【0105】
実施例25
化合物22(R1:sec−ブチル、R2:エトキシカルボニル、R3:ニトロ)の製造:
エチル 7−クロロ−6−(2−クロロエチル)−3−ニトロピラゾロ[1,5−a]ピリミジン−5−カルボキシレートとsec−ブチルアミンより、実施例23と同様に化合物22を得た。(収率90.1%)
【0106】
1H−NMR(CDCl3,ppm)
0.96(3H,t,J=7.3Hz),1.37(3H,d,J=6.5Hz),1.47(3H,t,J=7.0Hz),1.64〜1.80(2H,m),3.58(3H,t,J=7.3Hz)、3.82〜4.04(2H,m)、4.46(2H,q,J=7.0Hz),5.73(1H,s、J=6.5Hz),8.67(1H,s)
【0107】
実施例26
化合物23(R1:シクロペンチル、R2:カルボキシル、R3:ニトロ)の製造:
化合物21の2.05gをテトラヒドロフラン30ml、メタノール10mlに懸濁し、氷水冷下0.5N−水酸化ナトリウム水溶液20mlを滴下し15分放置し、更に0.5N−水酸化ナトリウム水溶液20mlを滴下した。氷水冷下15分放置し5分間超音波処理をして濃硫酸を加えpHを3にした。水200mlを加えて不溶物を濾取し水洗し乾燥させて化合物23を1.21g(収率64.2%)得た。
【0108】
1H−NMR(DMSO−d6,ppm)
1.50〜2.00(8H,m),3.40(2H,t,J=8.6Hz),3.99(2H,t,J=8.6Hz),5.78(1H,q,J=8.0Hz),8.93(1H,s)
【0109】
実施例27
化合物24(R1:sec−ブチル、R2:カルボキシル、R3:ニトロ)の製造:
実施例26と同様に化合物22を処理して、化合物24を得た。(収率85.7%)
【0110】
1H−NMR(DMSO−d6,ppm)
0.86(3H,t,J=7.3Hz),1.29(3H,d,J=6.5Hz),1.50〜1.80(2H,m),3.42(3H,t,J=8.9Hz),3.80〜4.04(2H,m),5.45〜5.65(1H,m),8.93(1H,s),13.56(1H,brs)
【0111】
実施例28
化合物25(R1:tert−ブチル、R2:メチル、R3:トリフルオロアセチル)の製造:
7−クロロ−6−(2−クロロエチル)−5−メチルピラゾロ[1,5−a]ピリミジン500mg(2.17mmol)を乾燥ジメチルホルムアミド9mlに溶解し、これにtert−ブチルアミン191mg(2.61mmol)、トリエチルアミン660mg(6.53mmol)を順次加え、室温で172時間攪拌した。反応液を水50mlに注ぎ、数分攪拌した後、クロロホルムで抽出した(10ml×4)。全クロロホルム層を合わせ、硫酸ナトリウム乾燥後、溶媒留去した。
残渣を酢酸エチル20mlに溶解し、飽和食塩水で洗い(50ml×6)、硫酸ナトリウム乾燥後、溶媒留去した。残渣をシリカゲルカラムクロマトグラフィー(クロロホルム:n−ヘキサン=8:2)に付し、8−tert−ブチル−6,7−ジヒドロ−5−メチル−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジンを0.24g(収率47.9%)得た。
【0112】
IR(KBr錠剤、cm-1
1593,1558,1498,1313,1250,1209,749
m.p.
143.5〜145.5℃
1H−NMR(CDCl3,ppm)
1.73(9H,s),2.34(3H,s),2.96(2H,t,J=9.0Hz),3.95(2H,t,J=9.0Hz),6.28(1H,d,J=2.7Hz),7.92(1H,d,J=2.7Hz)
【0113】
この8−tert−ブチル−6,7−ジヒドロ−5−メチル−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン0.24gを乾燥塩化メチレン2.5mlに溶解し、トリフルオロ酢酸無水物0.3mlを加え7時間撹拌した。反応液をクロロホルム10mlと水50mlに注ぎ、飽和重曹水でアルカリ性にし、有機層を分離した。硫酸ナトリウムで乾燥させた後シリカゲルカラムクロマトグラフィー(クロロホルム)で精製し、エタノールから再結晶し、化合物25を0.20g(収率58.5%)得た。
【0114】
IR(KBr錠剤、cm-1
1672,1596,1583,1503,1222,1184,1157,1123,883,730
m.p.
201.9〜203.2℃
1H−NMR(CDCl3,ppm)
1.72(9H,s),2.46(3H,s),3.05(2H,t,J=9.2Hz),4.07(2H,t,J=9.2Hz),8.41(1H,s)
【0115】
実施例29
化合物26(R1:tert−アミル、R2:メチル、R3:トリフルオロアセチル)の製造:
実施例28と同様に7−クロロ−6−(2−クロロエチル)−5−メチルピラゾロ[1,5−a]ピリミジンとtert−アミルアミンより製造した8−tert−アミル−6,7−ジヒドロ−5−メチル−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジンから化合物26を得た。(収率43.0%)
【0116】
IR(KBr錠剤、cm-1
1671,1584,1501,1222,1185,1155,1122,882
m.p.
147.3〜148.8℃
1H−NMR(CDCl3,ppm)
0.89(3H,t,J=7.8Hz),1.65(6H,s),2.29(2H,q,J=7.8Hz),2.46(3H,s),3.06(2H,t,J=9.2Hz),4.08(2H,t,J=9.2Hz),8.39(1H,s)
【0117】
実施例30
化合物27(R1:シクロペンチル、R2:メチル、R3:トリフルオロアセチル)の製造:
実施例28と同様に7−クロロ−6−(2−クロロエチル)−5−メチルピラゾロ[1,5−a]ピリミジンとシクロペンチルアミンより製造した8−シクロペンチル−6,7−ジヒドロ−5−メチル−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジンから化合物27を得た。(収率85.0%)
【0118】
IR(KBr錠剤、cm-1
1678,1626,1193,1127,885
m.p.
160.1〜163.3℃
1H−NMR(CDCl3,ppm)
1.58〜1.88(6H,m),1.88〜2.10(2H,m),2.46(3H,s),3.15(2H,t,J=9.2Hz),3.90(2H,t,J=9.2Hz),5.73〜5.95(1H,m),8.39(1H,s)
【0119】
実施例31
化合物28(R1:シクロヘキシル、R2:メチル、R3:トリフルオロアセチル)の製造:
実施例28と同様に7−クロロ−6−(2−クロロエチル)−5−メチルピラゾロ[1,5−a]ピリミジンとシクロヘキシルアミンより製造した8−シクロヘキシル−6,7−ジヒドロ−5−メチル−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジンから化合物28を得た。(収率18.1%)
【0120】
IR(KBr錠剤、cm-1
1677,1624,1601,1515,1508,1241,1191,1175,1129
m.p.
156.0〜158.2℃
1H−NMR(CDCl3,ppm)
1.00〜1.30(1H,m),1.30〜2.00(9H,m),2.46(3H,s),3.14(2H,t,J=8.9Hz),3.89(2H,t,J=8.9Hz),5.22〜5.38(1H,m),8.39(1H,s)
【0121】
実施例32
化合物29(R1:sec −ブチル、R2:メチル、R3:トリフルオロアセチル)の製造:
実施例28と同様に7−クロロ−6−(2−クロロエチル)−5−メチルピラゾロ[1,5−a]ピリミジンとsec−ブチルアミンより製造した8−sec−ブチル−6,7−ジヒドロ−5−メチル−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジンから化合物29を得た。(収率58.5%)
【0122】
IR(KBr錠剤、cm-1
1675,1630,1600,1515,1245,1225,1180,1155,1125,880,775,725
m.p.
169.9〜171.3℃
1H−NMR(CDCl3,ppm)
0.94(3H,t,J=7.6Hz),1.31(3H,d,J=7.0Hz),1.55〜1.80(2H,m),2.46(3H,s),3.17(2H,t,J=8.9Hz),3.70〜3.95(2H,m),5.50〜5.68(1H,m),8.38(1H,s)
【0123】
実施例33
エチル 6−(2−ヒドロキシエチル)−5−メチルピラゾロ[1,5−a]ピリミジン−7(4H)−オン−3−カルボキシレートの製造:
エチル 3−アミノピラゾール−4−カルボキシレート1.55g(10.00mmol)、α−アセチル−γ−ブチロラクトン1.92g(15.00mmol)に乾燥エタノール2mlを加え、これに窒素雰囲気下室温で攪拌しながらボロントリフルオリドメタノールコンプレックス0.1mlを加え、続いて同条件下15分間攪拌し、2時間35分放置した。その後エタノールを加え、不溶固体を濾取し、エタノールで洗い、風乾した。得られた固体を水10.5mlに懸濁し、これにトリエチルアミン1.03g(10.2mmol)を加え、油浴温100℃で3時間攪拌した。その後氷−水で冷却し、攪拌しながら濃塩酸を加えpH4付近とした(固体析出)。これにクロロホルムと水を加え、よく振とうした後、クロロホルム層を分離し、水層はクロロホルムにて更に抽出した。全クロロホルム層は合わせて、硫酸ナトリウム乾燥後、溶媒留去した。残渣をシリカゲルカラムクロマトグラフィー(クロロホルム、クロロホルム:メタノール=100:1)に付し、目的物を2.11g(収率79.6%)得た。
【0124】
IR(KBr錠剤、cm-1
3491,3301,1695,1666,1580,1233,1215,1035,778
1H−NMR(CDCl3,ppm)
1.39(3H,t,J=7.3Hz),2.50(3H,s),2.88(2H,t,J=6.2Hz),3.88(2H,t,J=6.2Hz),4.35(2H,q,J=7.3Hz),7.27(1H,s),9.53(1H,brs)
【0125】
実施例34
エチル 7−クロロ−6−(2−クロロエチル)−5−メチルピラゾロ[1,5−a]ピリミジン−3−カルボキシレートの製造:
エチル 6−(2−ヒドロキシエチル)−5−メチルピラゾロ[1,5−a]ピリミジン−7(4H)−オン−3−カルボキシレート0.34g(1.28mmol)にオキシ塩化リン0.4ml(d=1.645,4.29mmol)、トリエチルアミン0.36ml(d=0.726,2.59mmol)を順次加え、続いて窒素雰囲気下油浴温100℃で2時間15分攪拌した。その後氷−水で冷却し、クロロホルム10mlに溶解し、これを水30mlに注いだ。飽和重曹水にてpH6付近とし、よく振とうした後有機層を分離し、水層は更にクロロホルムで抽出し(10ml×2)、全クロロホルム層は合わせて硫酸ナトリウム乾燥後、溶媒留去した。残渣をシリカゲルカラククロマトグラフィー(クロロホルム)に付し、目的物を0.33g(収率84.6%)得た。
【0126】
1H−NMR(CDCl3,ppm)
1.42(3H,t,J=7.3Hz),2.83(3H,s),3.38(2H,t,J=7.2Hz),3.78(2H,t,J=7.2Hz),4.42(2H,q,J=7.3Hz),8.57(1H,s)
【0127】
実施例35
エチル 8−シクロペンチル−6,7−ジヒドロ−5−メチル−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−3−カルボキシレートの製造(化合物30):
エチル 7−クロロ−6−(2−クロロエチル)−5−メチルピラゾロ[1,5−a]ピリミジン−3−カルボキシレート0.12g(0.40mmol)の1.6ml乾燥ジメチルホルムアミド溶液に、シクロペンチルアミン0.04g(0.47mmol)、トリエチルアミン0.12g(1.19mmol)を順次加え、室温で17時間30分攪拌した。その後、反応液を水50mlに注ぎ、クロロホルムにて抽出(10ml×3)し、全クロロホルム層は合わせて、硫酸ナトリウム乾燥後溶媒留去した。残渣をシリカゲルカラムクロマトグラフィー(クロロホルム)に付し、目的物を0.10g(収率80.0%)得た。
【0128】
m.p.
178〜180℃
IR(KBr錠剤、cm-1
1688,1610,1514,1459,1313,1295,1180,1110,776
1H−NMR(CDCl3,ppm)
1.39(3H,t,J=7.3Hz),1.60〜1.85(6H,m),1.85〜2.05(2H,m),2.43(3H,s),3.11(2H,t,J=9.0Hz),3.84(2H,t,J=9.0Hz),4.37(2H,q,J=7.3Hz),5.85〜6.00(1H,m),8.34(1H,s)
【0129】
実施例36
化合物31(R1:tert−ブチル、R2:メチル、R3:エトキシカルボニル)の製造:
7−クロロ−6−(2−クロロエチル)−3−エトキシカルボニル−5−メチルピラゾロ[1,5−a]ピリミジン1gとtert−ブチルアミン3.2mlより、実施例35と同様の方法で化合物31を0.57g(収率57%)得た。
【0130】
IR(KBr錠剤、cm-1
1708,1600,1570,1176
m.p.
164〜165℃
1H−NMR(CDCl3,ppm)
1.34(3H,t,J=7.0Hz),1.69(9H,s),2.47(3H,s),3.00(2H,t,J=8.9Hz),4.00(2H,t,J=8.9Hz),4.36(2H,q,J=7.0Hz),8.35(1H,s)
【0131】
実施例37
化合物32(R1:tert−アミル、R2:メチル、R3:エトキシカルボニル)の製造:
7−クロロ−6−(2−クロロエチル)−3−エトキシカルボニル−5−メチルピラゾロ[1,5−a]ピリミジン1.45gとtert−アミルアミン5mlより、実施例35と同様の方法で化合物32を0.89g(収率58.9%)得た。
【0132】
IR(KBr錠剤、cm-1
1705,1600,1507,1174
m.p.
137〜139℃
1H−NMR(CDCl3,ppm)
0.86(3H,t,J=7.6Hz),1.38(3H,t,J=7.0Hz),1.63(6H,s),2.30(2H,q,J=7.6Hz),2.42(3H,s),3.00(2H,t,J=8.9Hz),4.01(2H,t,J=8.9Hz),4.36(2H,q,J=7.0Hz),8.33(1H,s)
【0133】
実施例38
化合物33(R1:シクロペンチル、R2:メチル、R3:カルボキシル)の製造:
化合物30の0.90gをエタノール13mlに懸濁し、これに水酸化ナトリウム0.84gを水6.5mlに溶かしたものを加え、窒素雰囲気下100℃で30分加熱撹拌した。氷水で冷却し、撹拌しながら水13mlを加え、1N−塩酸を加えてpHを2にし、更に飽和重曹水を加えpHを3〜4にした。不溶固体を濾取し、水洗風乾し化合物33を0.75g(収率91.5%)得た。
【0134】
IR(KBr錠剤、cm-1
1723,1610,1516,1301,1202,1191,778
m.p.
230〜230.5℃
1H−NMR(CDCl3,ppm)
1.60〜1.88(6H,m),1.88〜2.10(2H,m),2.34(3H,s),3.14(2H,t,J=9.2Hz),3.91(2H,t,J=9.2Hz),5.78〜5.95(1H,m),8.36(1H,s)
【0135】
実施例39
化合物34(R1:tert−ブチル、R2:メチル、R3:カルボキシル)の製造:
実施例38と同様に、化合物31の0.70gを処理し、化合物34を0.64g(定量的)得た。
【0136】
IR(KBr錠剤、cm-1
1718,1584,1508,1203
m.p.
258〜259℃
1H−NMR(DMSO−d6,ppm)
1.67(9H,s),2.31(3H,s),2.99(2H,t,J=8.9Hz),4.08(2H,t,J=8.9Hz),8.39(1H,s)
【0137】
実施例40
化合物35(R1:tert−アミル、R2:メチル、R3:カルボキシル)の製造:
実施例38と同様に、化合物32の0.5gを処理し、化合物35を0.41g(収率89.7%)得た。
【0138】
IR(KBr錠剤、cm-1
1723,1578,1504,1186
m.p.
239〜240℃
1H−NMR(DMSO−d6,ppm)
0.89(3H,t,J=7.3Hz),1.73(6H,s),2.30(2H,q,J=7.3Hz),2.36(3H,s),3.04(2H,t,J=8.9Hz),4.08(2H,t,J=8.9Hz),8.38(1H,s)
【0139】
実施例41
化合物36(R1:シクロペンチル、R2:メチル、R3 :N−(1H−テトラゾール−5−イル)カルボキサミド)の製造:
化合物33の0.286gを乾燥DMF2mlに懸濁させ、窒素雰囲気下室温にて撹拌しながら1,1’−カルボニルジイミダゾール0.20gを固体のまま加え、室温で15分、90℃で40分撹拌した。この反応液に5−アミノ−1H−テトラゾール0.12gを加え、1時間30分撹拌した。氷水で冷却し、水10mlを加え、撹拌しながら1N−塩酸を加え、pHを1にし、続いて飽和重曹水を加えpHを4にした。不溶固体を濾取し水洗風乾して化合物36を0.315g(収率89.2%)得た。
【0140】
IR(KBr錠剤、cm-1
1676,1605,1543,1508,1297,1200,1186,764
m.p.
293〜296℃
1H−NMR(CDCl3,ppm)
1.68〜1.88(6H,m),1.90〜2.08(2H,m),2.45(3H,s),3.17(3H,t,J=9.2Hz),3.93(3H,t,J=9.2Hz),5.80〜5.95(1H,m),8.52(1H,s)
【0141】
参考例5
1−ブロモ−2−t−ブチルジメチルシリロキシエタンの製造:
モレキュラーシーブス乾燥済みアセトニトリル40mlにt−ブチルジメチルシリルクロリド3.50g、イミダゾール4.00gを加え、室温にて10分間攪拌を行った。ここに、2−ブロモエタノール2.64gを加え、室温で更に6時間攪拌を行った。溶媒を減圧留去し、残渣に酢酸エチルを加えた。酢酸エチル層は飽和炭酸水素ナトリウム水溶液で洗浄し、無水炭酸ナトリウムで乾燥を行った後、溶媒を減圧留去、ここで得られた粗生成物をシリカゲルカラムクロマトグラフィー(溶出溶媒ヘキサン:酢酸エチル=2:1)に供し、目的物を4.40g(収率87.0%)得た。
【0142】
無色液体
1H−NMR(CDCl3,ppm)
−0.10(6H,s),0.82(9H,s),3.31(2H,t,J=6.3Hz),3.80(2H,t,J=6.3Hz)
【0143】
参考例6
2−(2−t−ブチルジメチルシリロキシエチル)マロン酸ジエチルの製造:
モレキュラーシーブス乾燥済みエタノール1.70Lに金属ナトリウム22.90gを溶解させ、マロン酸ジエチル131.0g、参考例5の化合物を230g加え、加熱還流下1晩攪拌を行った。溶媒をあらかた減圧留去した後少々エーテルを加え、析出している結晶を濾別、濾液を濃縮し、シリカゲルカラムクロマトグラフィー(溶出溶媒ヘキサンのみ→ヘキサン:酢酸エチル=10:1)に供し目的物を234.42g(収率89.9%)得た。
【0144】
無色液体
1H−NMR(CDCl3,ppm)
0.02(6H,s),0.87(9H,s),1.25(6H,t,J=7.2Hz),2.10(2H,q,J=6.5Hz),3.54〜3.66(3H,m),4.17(4H,m)
【0145】
参考例7
5−ヒドロキシ−6−(2−ヒドロキシエチル)ピラゾロ[1,5−a]ピリミジン−7(4H)−オンの製造:
モレキュラーシーブス乾燥済みエタノール1200mlに金属ナトリウム6.72gを溶解した後、参考例6の化合物64.0g、3−アミノピラゾール12.12gを加え、加熱還流下3日間攪拌を行った。溶媒を減圧留去し、残渣に水を加え溶解させた。水層はエーテルで3回洗浄を行った。水層を0℃に冷やし、1N塩酸にてpH=5.0に調整し、ここで析出した結晶を濾取した。この結晶にメタノール200ml、濃塩酸3滴を加え、溶媒を水分とともに減圧留去、メタノール/エーテル系より結晶を析出させ、目的物を21.38g(収率76.8%)得た。
【0146】
淡褐色結晶
1H−NMR(DMSO−d6,ppm)
2.66(2H,t,J=6.7Hz),3.52(2H,t,J=6.7Hz),5.93(1H,d,J=1.9Hz),7.60(1H,d,J=1.9Hz)
【0147】
参考例8
6−(2−クロロエチル)−5,7−ジクロロピラゾロ[1,5−a]ピリミジンの製造:
5−ヒドロキシ−6−(2−ヒドロキシエチル)ピラゾロ[1,5−a]ピリミジン−7(4H)−オン12.45gにオキシ塩化リン100ml、トリエチルアミン13.00gを加え、加熱還流下、2時間攪拌を行った。過剰のオキシ塩化リンを減圧留去後、残渣を氷−水に注ぎ、クロロホルムで抽出した。クロロホルム層を水洗した後、硫酸ナトリウム乾燥後、溶媒を減圧留去した。残渣をシリカゲルカラムクロマトグラフィー(クロロホルム)に付し、目的物を10.86g(収率68.0%)得た。
【0148】
淡褐色結晶
1H−NMR(CDCl3,ppm)
3.49(2H,t,J=7.0Hz),3.82(2H,t,J=7.0Hz),6.80(1H,d,J=2.4Hz),8.21(1H,d,J=2.4Hz)
【0149】
実施例42
6−(2−クロロエチル)−5,7−ジクロロ−3−ニトロピラゾロ[1,5−a]ピリミジンの製造:
濃硫酸100mlを氷冷下0℃に冷却し、ここに温度が上がらぬように徐々に90%硝酸50mlを加えていった。しばらく攪拌した後に参考例8の化合物13.80gを結晶のままやはり温度が上がらぬように徐々に加え、0℃のまま4時間攪拌を行った。TLC上で原料スポットが消失したため攪拌をやめ、反応液を氷水の中にあけた。析出してくる結晶を濾取、風乾を行った。収量15.61g。収率95.5%。
【0150】
黄色結晶
1H−NMR(CDCl3,ppm)
3.55(2H,t,J=7.0Hz),3.89(2H,t,J=7.0Hz),8.84(1H,s)
【0151】
実施例43
8−t−ブチル−5−クロロ−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物40)の製造:
実施例42の化合物6.00gを乾燥ジメチルホルムアミド50mlに溶解し、t−ブチルアミン1.80g、トリエチルアミン4.10gを加え、室温にて4時間攪拌した。反応液を減圧濃縮し、残渣をクロロホルムに溶解し、希塩酸、飽和食塩水で洗い、硫酸ナトリウム乾燥後、溶媒留去した。残渣につき、クロロホルム−エーテル系より結晶を析出させ、目的物を得た。収量5.54g。収率92.3%。
【0152】
黄色結晶
m.p.
247℃(分解)
IR(KBr錠剤、cm-1
1610,1580,1480
1H−NMR(CDCl3,ppm)
1.78(9H,s),3.13(2H,t,J=8.9Hz),4.15(2H,t,J=8.9Hz),8.61(1H,s)
【0153】
実施例44
5−クロロ−8−シクロペンチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物41)の製造:
実施例42の化合物6.00gにシクロペンチルアミン5.59g、トリエチルアミン4.10gを作用させ、実施例43の合成方法に準じて合成を行った。収量5.59g。収率89.2%。
【0154】
黄色結晶
m.p.
209〜210℃
IR(KBr錠剤、cm-1
1610,1480,1230
1H−NMR(CDCl3,ppm)
1.76(6H,m),2.04(2H,m),3.26(2H,t,J=7.8Hz),3.86(2H,t,J=7.8Hz),5.79(1H,m),8.57(1H,s)
【0155】
実施例45
8−sec−ブチル−5−クロロ−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物42)の製造:
実施例42の化合物6.00gにsec−ブチルアミン1.80g、トリエチルアミン4.10gを作用させ、実施例43の合成方法に準じて合成を行った。収量5.50g。収率91.7%。
【0156】
黄色結晶
m.p.
270℃以上
IR(KBr錠剤、cm-1
1630,1610,1490,1230,1220
1H−NMR(CDCl3,ppm)
0.95(3H,t,J=7.0Hz),1.34(3H,d,J=7.0Hz),1.68(2H,m),3.24(2H,t,J=8.9Hz),3.89(1H,m),5.58(1H,m),8.58(1H,s)
【0157】
参考例9
8−tert−ブチル−5−クロロ−6,7−ジヒドロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジンの製造:
6−(2−クロロエチル)−5,7−ジクロロピラゾロ[1,5−a]ピリミジン12.50gをジメチルホルムアミド70mlに溶解し、tert−ブチルアミン9.55g、トリエチルアミン11.47gを加え、室温にて2日間攪拌を行った。過剰のアミン及び溶媒を減圧留去し残渣をクロロホルムに溶解した。クロロホルム層は飽和食塩水で洗浄した後無水硫酸ナトリウムで乾燥を行い、溶媒を減圧留去、クロロホルム/エーテル系より結晶を析出させた。この結晶を濾取し、エタノールを用いて再結晶を行い、目的物を11.34g(収率90.6%)得た。
【0158】
白色結晶
1H−NMR(CDCl3,ppm)
1.79(9H,s),3.06(2H,t,J=7.2Hz),4.00(2H,t,J=7.2Hz),6.31(1H,d,J=2.4Hz),7.95(1H,d,J=2.4Hz)
【0159】
参考例10
5−クロロ−8−シクロペンチル−6,7−ジヒドロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジンの製造:
6−(2−クロロエチル)−5,7−ジクロロピラゾロ[1,5−a]ピリミジン11.0gにシクロペンチルアミン4.54g、トリエチルアミン8.87gを作用させ、参考例9の合成方法に準じて合成を行った。収量10.42g。収率90.4%。
【0160】
白色結晶
1H−NMR(CDCl3,ppm)
1.70(6H,m),2.10(2H,m),3.15(2H,t,J=6.2Hz),3.85(2H,t,J=6.2Hz),6.04(1H,m),6.30(1H,d,J=2.4Hz),7.95(1H,d,J=2.4Hz)
【0161】
参考例11
8−sec−ブチル−5−クロロ−6,7−ジヒドロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジンの製造:
6−(2−クロロエチル)−5,7−ジクロロピラゾロ[1,5−a]ピリミジン5.26gにsec−ブチルアミン4.00g、トリエチルアミン4.82gを作用させ、参考例9の合成方法に準じて合成を行った。収量4.68g。収率89.0%。
【0162】
白色結晶
1H−NMR(CDCl3,ppm)
0.97(3H,t,J=7.3Hz),1.29(3H,d,J=7.0Hz),1.69(2H,m),3.20(2H,t,J=6.2Hz),3.80(2H,m), 5.73(1H,m), 6.30(1H,d,J=1.9Hz),7.94(1H,d,J=1.9Hz)
【0163】
参考例12
8−tert−ブチル−6,7−ジヒドロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジンの製造:
8−tert−ブチル−5−クロロ−6,7−ジヒドロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン11.30gをテトラヒドロフラン300ml、メタノール150mlの混合溶媒に溶解し、反応系を0℃に冷却した。ここに塩化パラジウム3.75g、水素化ホウ素ナトリウム7.83gを徐々に加え、0℃にて30分間攪拌を行った。更に塩化パラジウム7.50g、水素化ホウ素ナトリウム5.66gを徐々に加え、0℃にて30分間、室温にて2時間攪拌を行った。反応溶媒を減圧留去し、粗生成物をシリカゲルカラムクロマトグラフィー(酢酸エチル→酢酸エチル:メタノール=10:1)に付し、目的物を3.94g(収率40.4%)得た。
【0164】
白色結晶
1H−NMR(CDCl3,ppm)
1.74(9H,s),3.04(2H,t,J=8.9Hz),3.96(2H,t,J=8.9Hz),6.37(1H,d,J=2.2Hz),7.94(1H,s),7.96(1H,d,J=2.2Hz)
【0165】
参考例13
8−シクロペンチル−6,7−ジヒドロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジンの製造:
5−クロロ−8−シクロペンチル−6,7−ジヒドロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン10.42gを用い、参考例12と同様の方法で目的物を3.44g(収率38.0%)得た。
【0166】
白色結晶
1H−NMR(CDCl3,ppm)
1.75(6H,m),1.98(2H,m),3.16(2H,t,J=8.9Hz),3.85(2H,t,J=8.9Hz),6.05(1H,m),6.31(1H,d,J=2.4Hz),7.98(1H,s),7.98(1H,d,J=2.4Hz)
【0167】
参考例14
8−sec−ブチル−6,7−ジヒドロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジンの製造:
8−sec−ブチル−5−クロロ−6,7−ジヒドロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン4.68gを用い、参考例12と同様の方法で目的物を1.23g(収率30.4%)得た。
【0168】
白色結晶
1H−NMR(CDCl3,ppm)
0.94(3H,t,J=7.6Hz),1.27(3H,d,J=6.5Hz),1.63(2H,m), 3.17(2H,t,J=8.9Hz),3.75(2H,m),5.73(1H,m),6.37(1H,d,J=2.4Hz),7.96(1H,s),7.96(1H,d,J=2.4Hz)
【0169】
実施例46
8−tert−ブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物37)の製造:
酢酸25mlに徐々に90%硝酸を3.30ml加えた後、濃硫酸を3滴加え、室温にてしばらく攪拌を行った。ここに8−tert−ブチル−6,7−ジヒドロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン3.90gの酢酸8.0ml溶液を徐々に加えていった。TLC上で原料スポットが消失したため攪拌を止め、反応溶液を氷水の中にあけ、クロロホルム抽出を行った。クロロホルム層は飽和食塩水で洗浄した後、無水硫酸ナトリウムで乾燥し、溶媒を減圧留去した。クロロホルム/エーテル系より結晶を析出させた。濾取した結晶は、エタノールより再結晶化させ、精製を行い、目的物を2.32g(収率49.0%)得た。
【0170】
黄色結晶
m.p.
209℃
IR(KBr錠剤、cm-1
1620,1590,1490,1400
1H−NMR(CDCl3,ppm)
1.73(9H,s),3.16(2H,t,J=8.9Hz),4.12(2H,t,J=8.9Hz),8.17(1H,s),8.61(1H,s)
【0171】
実施例47
8−シクロペンチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物38)の製造:
8−シクロペンチル−6,7−ジヒドロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン3.40gを用い、実施例46と同様の方法で目的物を2.57g(収率56.0%)得た。
【0172】
黄色結晶
m.p.
181℃
IR(KBr錠剤、cm-1
1620,1610,1480,1245,1220
1H−NMR(CDCl3,ppm)
1.75(6H,m),2.05(2H,m),3.29(2H,t,J=8.4Hz),4.06(2H,t,J=8.4Hz),5.83(1H,m),8.14(1H,s),8.60(1H,s)
【0173】
実施例48
8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物39)の製造:
8−sec−ブチル−6,7−ジヒドロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン240mgを用い、実施例46と同様の方法で目的物を190mg(収率65.5%)得た。
【0174】
黄色結晶
m.p.
199℃
IR(KBr錠剤、cm-1
1630,1610,1480,1250,1220
1H−NMR(CDCl3,ppm)
0.95(3H,t,J=7.3Hz),1.33(3H,d,J=6.8Hz),1.73(2H,m),3.27(2H,t,J=9.2Hz),3.87(2H,m),5.62(1H,m),8.18(1H,s),8.62(1H,s)
【0175】
実施例49
8−sec−ブチル−6,7−ジヒドロ−5−ヒドロキシメチル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物53)の製造:
330mgの化合物24を乾燥テトラヒドロフラン10mlに懸濁し、氷−塩で反応系を冷却し、窒素雰囲気下、撹拌しながらトリエチルアミン0.17mlを加えた。更にここにクロロ炭酸エチル0.12mlの乾燥テトラヒドロフラン2ml溶液を1分間で滴下し、40分間撹拌した。次に反応系に水素化ホウ素ナトリウム100mgを一度に加え、室温で1時間撹拌、更に水素化ホウ素ナトリウム50mgを加え、氷冷下、1時間撹拌した。同温度で1規定塩酸を少しずつ加えていき、pH=1〜2に調整した。これに飽和炭酸水素ナトリウム水溶液を加え弱アルカリ性とし、水10mlを加えた後に酢酸エチルで抽出した。有機層は飽和食塩水で洗浄した後、無水硫酸ナトリウムで乾燥し、溶媒を減圧留去した。また、水層はクロロホルムで再度抽出し、無水硫酸ナトリウムで乾燥した後、溶媒を減圧留去した。両有機層から得られた粗生成物を合わせてシリカゲルカラムクロマトグラフィー(溶出溶媒 クロロホルム:メタノール=100:0.5)に付し、目的物を40mg得た。(収率12.7%)
【0176】
黄色結晶
IR(KBr錠剤,cm-1
3421,1623,1489,1241
m.p.
222〜226℃
1H−NMR(CDCl3,ppm)
0.94(3H,t,J=7.3Hz),1.33(3H,d,J=6.5Hz),1.65(2H,m),3.19(2H,t,J=8.9Hz),3.87(2H,m),4.65(2H,s),5.60(1H,m),8.56(1H,s)
【0177】
実施例50
8−sec−ブチル−5−カルバモイル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物75)の製造:
0.19gの化合物24を乾燥テトラヒドロフラン6mlに懸濁し、氷−塩で反応系を冷却し、窒素雰囲気下、撹拌しながらトリエチルアミン0.11mlを加えた。更にここにクロロ炭酸エチル0.08mlの乾燥テトラヒドロフラン2ml溶液を2分間要し滴下し、同条件で40分間撹拌した。引き続き同条件で濃アンモニア水1.8mlを一気に加え、室温で激しく1時間撹拌した。析出した結晶を濾取、風乾した。得られた結晶は一旦クロロホルム:メタノール=4:1に溶解し、不溶物を濾去した後、減圧濃縮し、ヘキサンを加えて再析出を行った。収量150mg(収率78.9%)。
【0178】
黄緑色結晶
IR(KBr錠剤,cm-1
3432,1697,1490,1236
m.p.
300℃以上
1H−NMR(DMSO−d6,ppm)
0.93(3H,t,J=7.3Hz),1.34(3H,d,J=6.5Hz),1.73(2H,m),3.53(2H,t,J=8.6Hz),4.00(2H,m),5.60(1H,m),7.83(1H,br),7.93(1H,br),8.99(1H,s)
【0179】
実施例51
エチル 8−シクロプロピル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボキシレート(化合物76)の製造:
エチル 7−クロロ−6−(2−クロロエチル)−3−ニトロ−ピラゾロ[1,5−a]ピリミジン−5−カルボキシレートとシクロプロピルアミンより、実施例23と同様に目的物を得た。(収率97.6%)
【0180】
1H−NMR(CDCl3,ppm)
1.00〜1.09(4H,m),1.42(3H,t,J=7.0Hz),3.50(2H,t,J=8.9Hz),3.70(1H,m),3.95(2H,t,J=8.9Hz),4.42(2H,q,J=7.0Hz),8.72(1H,s)
【0181】
実施例52
エチル 8−シクロブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボキシレート(化合物77)の製造:
エチル 7−クロロ−6−(2−クロロエチル)−3−ニトロ−ピラゾロ[1,5−a]ピリミジン−5−カルボキシレートとシクロブチルアミンより、実施例23と同様に目的物を得た。(収率99.8%)
【0182】
1H−NMR(CDCl3,ppm)
1.46(3H,t,J=6.8Hz),1.84(2H,m),2.38(4H,m),3.59(2H,t,J=8.6Hz),4.13(2H,t,J=8.6Hz),4.45(2H,q,J=6.8Hz),6.05(1H,m),8.67(1H,s)
【0183】
実施例53
エチル 6,7−ジヒドロ−8−イソプロピル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボキシレート(化合物78)の製造:
エチル 7−クロロ−6−(2−クロロエチル)−3−ニトロ−ピラゾロ[1,5−a]ピリミジン−5−カルボキシレートとイソプロピルアミンより、実施例23と同様に目的物を得た。(収率97.1%)
【0184】
1H−NMR(CDCl3,ppm)
1.40(6H,d,J=7.0Hz),1.47(3H,t,J=7.0Hz),3.56(2H,t,J=8.9Hz),3.99(2H,t,J=8.9Hz),4.45(2H,q,J=7.0Hz),5.89(1H,m),8.65(1H,s)
【0185】
実施例54
エチル 6,7−ジヒドロ−8−(1−エチルプロピル)−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボキシレート(化合物79)の製造:
エチル 7−クロロ−6−(2−クロロエチル)−3−ニトロ−ピラゾロ[1,5−a]ピリミジン−5−カルボキシレートと3−アミノペンタンより、実施例23と同様に目的物を得た。(収率96.4%)
【0186】
1H−NMR(CDCl3,ppm)
0.93(6H,t,J=7.3Hz),1.47(3H,t,J=7.3Hz),1.65〜1.82(4H,m),3.61(2H,t,J=8.6Hz),3.87(2H,t,J=8.6Hz),4.46(2H,q,J=7.3Hz),5.61(1H,m),8.67(1H,s)
【0187】
実施例55
8−シクロプロピル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボン酸(化合物80)の製造:
実施例26と同様にエチル 8−シクロプロピル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボキシレートを処理して、目的物を得た。(収率:定量的)
【0188】
1H−NMR(DMSO−d6,ppm)
0.86〜1.07(4H,m),3.33(2H,t,J=8.9Hz),3.68(1H,m),3.88(2H,t,J=8.9Hz),8.91(1H,s)
【0189】
実施例56
8−シクロブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボン酸(化合物81)の製造:
実施例26と同様にエチル 8−シクロブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボキシレートを処理して、目的物を得た。(収率:94.1%)
【0190】
1H−NMR(DMSO−d6,ppm)
1.78〜1.86(2H,m),2.30〜2.46(4H,m),3.59(2H,t,J=8.4Hz),4.15(2H,t,J=8.4Hz),4.23(1H,br),6.04(1H,m),8.68(1H,s)
【0191】
実施例57
6,7−ジヒドロ−8−イソプロピル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボン酸(化合物82)の製造:
実施例26と同様にエチル 6,7−ジヒドロ−8−イソプロピル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボキシレートを処理して、目的物を得た。(収率:97.0%)
【0192】
1H−NMR(DMSO−d6,ppm)
1.39(6H,d,J=7.0Hz),3.55(2H,t,J=8.6Hz),4.01(2H,t,J=8.6Hz),5.86(1H,m),8.69(1H,s)
【0193】
実施例58
6,7−ジヒドロ−8−(1−エチルプロピル)−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボン酸(化合物83)の製造:
実施例26と同様にエチル 6,7−ジヒドロ−8−(1−エチルプロピル)−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボキシレートを処理して、目的物を得た。(収率:97.3%)
【0194】
1H−NMR(DMSO−d6,ppm)
0.93(6H,t,J=7.3Hz),1.59〜1.86(4H,m),3.67(2H,t,J=8.9Hz),3.93(2H,t,J=8.9Hz),5.63(1H,m),8.68(1H,s)
【0195】
実施例59
5−アミノ−8−シクロプロピル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物84)の製造:8−シクロプロピル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボン酸を原料として、実施例20と同様の操作で目的物を製造した(収率:74.4%)。得られた目的物はクロロホルム−メタノール−エーテルから再析出を行った。
【0196】
黄色結晶
IR(KBr錠剤,cm-1
1636,1400,1260
m.p.
280℃以上
1H−NMR(DMSO−d6,ppm)
0.84(4H,m),2.80(2H,t,J=8.9Hz),3.18(1H,m),3.72(2H,t,J=8.9Hz),7.04(2H,br),8.51(1H,s)
【0197】
実施例60
5−アミノ−8−シクロブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物85)の製造:
8−シクロブチル−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボン酸を原料として、実施例20と同様の操作で目的物を製造した(収率:54.1%)。得られた目的物はクロロホルム−メタノール−エーテルから再析出を行った。
【0198】
黄色結晶
IR(KBr錠剤,cm-1
1640,1400,1240
m.p.
275℃以上
1H−NMR(DMSO−d6,ppm)
1.70(2H,m),2.16(2H,m),2.33(2H,m),2.96(2H,t,J=9.2Hz),3.93(2H,t,J=9.2Hz),5.75(1H,m),6.62(2H,br),8.37(1H,s)
【0199】
実施例61
5−アミノ−6,7−ジヒドロ−8−イソプロピル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物86)の製造:
6,7−ジヒドロ−8−イソプロピル−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボン酸を原料として、実施例20と同様の操作で目的物を製造した(収率:48.9%)。得られた目的物はクロロホルム−メタノール−エーテルから再析出を行った。
【0200】
黄色結晶
IR(KBr錠剤,cm-1
1635,1400,1260
m.p.
275℃以上
1H−NMR(DMSO−d6,ppm)
1.27(6H,d,J=6.2Hz),2.97(2H,t,J=9.5Hz),3.81(2H,t,J=9.5Hz),5.54(1H,m),6.03(2H,br),8.37(1H,s)
【0201】
実施例62
5−アミノ−6,7−ジヒドロ−8−(1−エチルプロピル)−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物87)の製造:
6,7−ジヒドロ−8−(1−エチルプロピル)−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン−5−カルボン酸を原料として、実施例20と同様の操作で目的物を製造した(収率:48.5%)。得られた目的物はクロロホルム−メタノール−エーテルから再析出を行った。
【0202】
黄色結晶
IR(KBr錠剤,cm-1
1650,1400,1253
m.p.
106〜109℃
1H−NMR(CDCl3,ppm)
0.90(6H,t,J=7.3Hz),1.54〜1.67(4H,m),3.00(2H,t,J=8.9Hz),3.75(2H,t,J=8.9Hz),5.35(1H,m),5.78(2H,br),8.41(1H,s)
【0203】
実施例63
8−sec−ブチル−5−ジエチルアミノ−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物57)の製造:
8−sec−ブチル−5−クロロ−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物42) 400mgにジエチルアミン1.00g、トリエチルアミン1.00g、ジメチルホルムアミド6.0mlを加え、加熱還流下3時間撹拌した。TLC上で原料スポットがほぼ消失したので撹拌を止め、溶媒の一部を減圧留去し、反応液を氷水の中にあけ、析出している結晶を濾取、風乾した。更にここで得られた結晶をエタノールより再結晶化した。収量410mg(収率91.1%)。
【0204】
黄色結晶
IR(KBr錠剤,cm-1
1630,1540,1400,1252
m.p.
174〜175℃
1H−NMR(CDCl3,ppm)
0.92(3H,t,J=7.3Hz),1.20〜1.30(8H,m),1.52〜1.68(2H,m),3.26(2H,t,J=9.2Hz),3.62〜3.73(6H,m),5.43〜5.56(1H,m),8.41(1H,s)
【0205】
実施例64
8−sec−ブチル−5−シクロブチルアミノ−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物59)の製造:
8−sec−ブチル−5−クロロ−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物42) 200mgをジメチルホルムアミド6.0mlに溶解し、ここにシクロブチルアミン800mg、トリエチルアミン800mgを加え、130℃で4時間撹拌した。TLC上で原料スポットが消失したので撹拌を止め、反応液を氷水の中にあけ、析出している結晶を濾取、風乾した。収量120mg(収率51.3%)。精製は更にシリカゲルカラムクロマトグラフィー(溶出溶媒 ヘキサン:酢酸エチル=1:1)に付し、更に、クロロホルム/エーテル系より結晶を析出させて行った。
【0206】
黄色結晶
IR(KBr錠剤,cm-1
3395,1635,1600,1380,1250
m.p.
249〜251℃
1H−NMR(CDCl3,ppm)
0.91(3H,t,J=7.3Hz),1.22(3H,d,J=6.5Hz),1.59(2H,m),1.77(2H,m),1.92(2H,m),2.48(2H,m),2.96(2H,t,J=8.9Hz),3.73(2H,m),4.73(2H,m),5.39(1H,m),8.39(1H,s)
【0207】
実施例65
8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−5−ピロリジノ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物60)の製造:
8−sec−ブチル−5−クロロ−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物42) 400mgにピロリジン1.00g、トリエチルアミン1.00g、ジメチルホルムアミド6.0mlを加え、加熱還流下2時間撹拌した。TLC上で原料スポットがほとんど消失したので撹拌を止め、溶媒、過剰のアミンをあらかた減圧留去し、残渣にクロロホルム/エーテルを加え、析出している結晶を濾取、乾燥した。更にここで得られた結晶をエタノールより再結晶化した。収量390mg(収率87.4%)。
【0208】
黄色結晶
IR(KBr錠剤,cm-1
1633,1540,1394,1256
m.p.
237℃
1H−NMR(CDCl3,ppm)
0.94(3H,t,J=7.0Hz),1.24(3H,d,J=6.7Hz),1.52〜1.68(2H,m),1.96(4H,m),3.36(2H,t,J=8.9Hz),3.56〜3.69(2H,m),3.78(4H,m),5.45(1H,m),8.37(1H,s)
【0209】
実施例66
8−sec−ブチル−6,7−ジヒドロ−3−ニトロ−5−ピペリジノ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物61)の製造:
8−sec−ブチル−5−クロロ−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物42) 200mgにピペリジン10mlを加え、加熱還流下1時間撹拌した。過剰のピペリジンを減圧留去し、残渣をクロロホルムに溶解し、1規定塩酸、飽和食塩水で有機層を洗浄後、無水硫酸ナトリウムで乾燥し、溶媒を減圧留去した。クロロホルム/エーテル系より結晶を析出させ、その結晶を濾取、乾燥した。得られた結晶を更に、エタノールより再結晶化した。収量140mg(収率60.9%)。
【0210】
黄色結晶
IR(KBr錠剤,cm-1
1638,1398,1230
m.p.
182℃
1H−NMR(CDCl3,ppm)
0.92(3H,t,J=7.2Hz),1.21(3H,d,J=6.5Hz),1.61〜1.80(8H,m),3.24(2H,t,J=9.5Hz),3.75(6H,m),5.51(1H,m),8.39(1H,s)
【0211】
実施例67
8−sec−ブチル−6,7−ジヒドロ−5−モルホリノ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物62)の製造:
8−sec−ブチル−5−クロロ−6,7−ジヒドロ−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物42) 400mgにモルホリン4.0mlを加え、加熱還流下1晩撹拌した。TLC上であまり変化がみられなかったのでジメチルホルムアミド4ml、トリエチルアミン1mlを加え、加熱還流下更に1晩撹拌した。TLC上で原料スポットがほとんど消失したので撹拌を止め、溶媒、過剰のアミンを減圧留去し、残渣をクロロホルムに溶解し、1規定塩酸、飽和食塩水で有機層を洗浄後、無水硫酸ナトリウムで乾燥し、溶媒を減圧留去した。残渣にクロロホルム、エーテルを加え、析出してきた結晶を濾取、更にこの結晶をエタノールより再結晶化した。収量260mg(収率56.5%)。
【0212】
黄色結晶
IR(KBr錠剤,cm-1
1642,1400,1250
m.p.
262℃
1H−NMR(CDCl3,ppm)
0.92(3H,t,J=7.6Hz),1.23(3H,d,J=7.0Hz),1.55〜1.64(2H,m),3.26(2H,t,J=9.2Hz),3.67〜3.80(10H,m),5.43(1H,m),8.41(1H,s)
【0213】
参考例15
ベンジルオキシ酢酸エチルの製造:
水素化ナトリウム4.42gを乾燥エーテルで2回洗浄し、トルエン80mlを加え、窒素雰囲気下、ベンジルアルコール10.81mlのトルエン20ml溶液を氷冷下で25分かけて滴下し、室温にて3時間30分撹拌した。次に反応系を氷冷し、ブロモ酢酸エチル16.76gのトルエン20ml溶液を30分かけて滴下した。更に0℃にて25分撹拌した後、冷水400ml、5規定塩酸2mlの混合液中に注ぎ、ベンゼンで抽出した。有機層は飽和食塩水で洗浄した後、無水硫酸ナトリウムで乾燥し、溶媒を減圧留去した。得られた粗生成物をシリカゲルカラムクロマトグラフィー(溶出溶媒 ヘキサン:酢酸エチル=15:1→12:1→10:1)に付し、無色油状の目的物を14.75g得た。収率76.0%。
【0214】
1H−NMR(CDCl3,ppm)
1.30(3H,t,J=7.0Hz),4.09(2H,s),4.22(2H,q,J=7.0Hz),4.64(2H,s),7.30〜7.42(5H,m)
【0215】
参考例16
2−ベンジルオキシアセチル−γ−ブチロラクトンの製造:
ジイソプロピルアミン10.6mlのテトラヒドロフラン75ml溶液を−70℃に冷却し、1.6規定n−ブチルリチウム−ヘキサン溶液46mlを滴下した。滴下終了後15分間撹拌し、γ−ブチロラクトン54.8gのテトラヒドロフラン50ml溶液を55分かけて滴下し、50分間撹拌した。更にベンジルオキシ酢酸エチル14.75gのテトラヒドロフラン50ml溶液を加え、−60〜−50℃にて2時間30分撹拌した。続いて20℃を越えないように5規定塩酸を加え、pH=1〜2に調整した。反応系に酢酸エチルを加え、これを飽和食塩水で洗浄した。有機層は無水硫酸ナトリウムで乾燥し、溶媒を減圧留去、粗生成物をシリカゲルカラムクロマトグラフィー(溶出溶媒 ヘキサン:酢酸エチル=3:1→2:1→1:1)に付し、無色油状の目的物を13.01g得た。収率87.2%。
【0216】
1H−NMR(CDCl3,ppm)
2.30(1H,m),2.75(1H,m),3.88(1H,m),4.27〜4.47(4H,m),4.68(2H,s),7.29〜7.38(5H,m)
【0217】
参考例17
3−{[2−(ベンジルオキシ)−1−(テトラヒドロ−2−オキソ−3−フリル)エチリデン]アミノ}ピラゾールの製造:
2−ベンジルオキシアセチル−γ−ブチロラクトン1.83g、3−アミノピラゾール0.50gをエタノール2.0mlに溶解し、三フッ化ホウ素メタノ−ルコンプレックス60μlを加え、室温にて16時間30分撹拌した。溶媒を減圧留去し、残渣をシリカゲルカラムクロマトグラフィー(溶出溶媒 ヘキサン:酢酸エチル=1:1→1:2)に付し、目的の黄色油状物を1.18g得た。収率65.5%。
【0218】
1H−NMR(CDCl3,ppm)
2.93(2H,t,J=7.8Hz),4.33(2H,t,J=7.8Hz),4.42(2H,s),4.52(2H,s),6.06(1H,d,J=2.4Hz),7.29〜7.37(5H,m),7.44(1H,d,J=2.4Hz),9.96(1H,br)
【0219】
参考例18
5−(ベンジルオキシメチル)−6−(2−ヒドロキシエチル)ピラゾロ[1,5−a]ピリミジン−7(4H)−オンの製造:
3−{[2−(ベンジルオキシ)−1−(テトラヒドロ−2−オキソ−3−フリル)エチリデン]アミノ}ピラゾール1.18gにトリエチルアミン600μl、水2.0mlを加え、加熱還流下40分間撹拌した。反応系を室温に戻した後、1規定塩酸を加え、pH=4に調整した。クロロホルムで抽出し、有機層は無水硫酸ナトリウムで乾燥した後、溶媒留去し、目的物を1.18g(定量的)得た。
【0220】
1H−NMR(CDCl3,ppm)
2.71(2H,t,J=5.7Hz),3.79(2H,t,J=5.7Hz),4.64(2H,s),4.67(2H,s),6.01(1H,d,J=2.2Hz),7.30〜7.38(5H,m),7.74(1H,d,J=2.2Hz)
【0221】
参考例19
5−(ベンジルオキシメチル)−7−クロロ−6−(2−クロロエチル)ピラゾロ[1,5−a]ピリミジンの製造:
5−(ベンジルオキシメチル)−6−(2−ヒドロキシエチル)ピラゾロ[1,5−a]ピリミジン−7(4H)−オン0.52gにオキシ塩化リン4.0ml、トリエチルアミン0.55mlを加え、油浴温100〜110℃で1時間20分撹拌した。過剰のオキシ塩化リン減圧留去し、反応残渣を氷水の中に注ぎ、クロロホルム抽出を行った。クロロホルム層は無水硫酸ナトリウムで乾燥した後、溶媒を減圧留去した。ここで得られた粗生成物をシリカゲルカラムクロマトグラフィー(溶出溶媒 クロロホルムのみ)に付し、目的物0.37gを得た。収率63.4%。
【0222】
1H−NMR(CDCl3,ppm)
3.39(2H,t,J=7.3Hz),3.75(2H,t,J=7.3Hz),4.65(2H,s),4.77(2H,s),6.79(1H,d,J=2.2Hz),7.30〜7.37(5H,m),8.19(1H,d,J=2.2Hz)
【0223】
実施例68
7−クロロ−6−(2−クロロエチル)−5−(2′,4′−ジニトロベンジルオキシメチル)−3−ニトロピラゾロ[1,5−a]ピリミジンの製造:
濃硫酸4.0mlを0℃に冷却し、温度が上がらぬように90%濃硝酸2.0mlを徐々に加えていき、同条件下、5−ベンジルオキシメチル−7−クロロ−6−(2−クロロエチル)ピラゾロ[1,5−a]ピリミジン0.37gを徐々に加え、1時間撹拌した。TLC上で原料スポットが消失したので撹拌を止め、反応液を氷水の中に注いだ。生じた結晶を濾取し、結晶を数回水洗し、乾燥して目的物を得た。収量0.35g。収率67.5%。
【0224】
1H−NMR(DMSO−d6,ppm)
3.45(2H,t,J=7.6Hz),3.87(2H,t,J=7.6Hz),5.14(2H,s),5.19(2H,s),8.20(1H,d,J=8.9Hz),8.60(1H,dd,J=8.9Hz,2.4Hz),8.79(1H,d,J=2.4Hz),9.19(1H,s)
【0225】
実施例69
8−sec−ブチル−6,7−ジヒドロ−5−(2′,4′−ジニトロベンジルオキシメチル)−3−ニトロ−8H−ピロロ[3,2−e]ピラゾロ[1,5−a]ピリミジン(化合物88)の製造:
7−クロロ−6−(2−クロロエチル)−5−(2′,4′−ジニトロベンジルオキシメチル)−3−ニトロピラゾロ[1,5−a]ピリミジン0.35gをジメチルホルムアミド5.0mlに溶解し、sec−ブチルアミン0.18gを加え、室温にて1時間30分撹拌した。溶媒を減圧留去し、残渣にクロロホルム50ml加え、1規定塩酸、飽和食塩水で洗浄した。有機層を無水硫酸ナトリウムで乾燥し、溶媒を減圧留去した。得られた結晶をクロロホルム−エーテル系より再析出させ、風乾した。更にこの粗生成物を分取用薄層クロマトグラフィー(展開溶媒 クロロホルム:メタノール=19:1)に付し、目的物を0.14g得た。収率40.0%。
【0226】
黄色結晶
IR(KBr錠剤,cm-1
1624,1225
m.p.
167〜168℃
1H−NMR(CDCl3,ppm)
0.96(3H,t,J=7.3Hz),1.34(3H,d,J=6.5Hz),1.69(2H,m),3.29(2H,t,J=8.9Hz),3.86(2H,m),4.81(2H,s),5.13(2H,s),5.65(1H,m),8.23(1H,d,J=8.4Hz),8.53(1H,dd,J=8.4Hz,2.2Hz),8.62(1H,s),8.92(1H,d,J=2.2Hz)
【0227】
実施例70
気管拡張作用(イン・ビトロ)
本発明の化合物(1)について、喘息等の呼吸器疾患の治療及び/又は予防に有益な気管拡張作用をマグヌス法によって調べた。即ち、ハートレー系白色種雄性モルモット(250〜300g)を打撲・放血死させてから気管を摘出した。この気管から短冊状の標本を作成し、混合ガス(95%O2、5%CO2)を通気して37℃に保温したクレブス−ヘンゼライト液を満たしたマグヌス管に懸垂した。静止張力1.0gを負荷して等尺性張力を記録した。試験化合物は3×10-7Mのカルバコール及び10-6Mのヒスタミンで収縮させた標本に累積的に投与して弛緩作用を検討した。累積投与後、10-4Mのパパベリンを投与して気管標本の最大弛緩作用を確認した。最大弛緩を100%とし、50%弛緩させる試験化合物の濃度の負の対数値を算出しpIC50値とした。結果を表1に示す。これより本発明の一般式(1)に表される化合物及び/又は生理的に許容されるこれらの塩は気管拡張作用に優れることが判る。又、R3 の置換基としてニトロ基が好ましいことも判る。
【0228】
【表1】
【0229】
実施例71
気管拡張作用(イン・ビトロ)
実施例70と同様にマグヌス法によって摘出気管を用いて(LTD4,濃度10-6M)、(CTA2,濃度10-7M)、(OA,濃度1mg/ml)による収縮に対する本発明の化合物のpIC50値を求めた。結果を表2に示す。これらの収縮に対しても本発明の化合物及び/又は生理的に許容されるこれらの塩は有効であることが判る。
【0230】
【表2】
【0231】
実施例72
気道収縮反応抑制作用(イン・ビボ)
1群6匹のハートレー系白色種雄性モルモット(250〜350g)をペントバルビツールで麻酔し、気管、頚動脈及び頚静脈にカニューレを挿入した。実験はブロンコスパスム・トランスデュサー(コンツェット−レッスラー法変法)の回路中に組み込んだ人工呼吸器に気道カニューレを接続し、横隔膜の切除により自発呼吸を停止させた後人工喚気下に於いて行い、気道収縮反応はベンチレーション・オーバーフロー量を指標として測定した。又、同時に頸動脈に挿入したカニューレを介して、血圧測定用アンプを用いて、血圧もモニターした。0.1N塩酸に溶解した試験化合物(1mg/ml/kg)を静脈投与後、0.5、5及び10分後にアセチルコリン(20μg/kg)又はヒスタミン(15μg/kg)を静脈投与し惹起された気道収縮反応を観察した。比較例としては、喘息の治療に一般的に広く用いられているテオフィリン(6mg/ml/kg)を用いた。数値は抑制率として算出した。血圧の変化(単位:mmHg)と合わせて結果を表3に示す。本発明の化合物は何れも気管収縮を抑制する作用に優れているにもかかわらず、血圧に与える影響が少ないことが判る。
【0232】
【表3】
【0233】
実施例73
気道収縮反応抑制作用(イン・ビボ)
食道にカニューレを挿入し、この食道カニューレより、1%CMCに懸濁した試験化合物(100mg/2ml/kg)を投与したこと、アセチルコリン、ヒスタミンの静脈注射が15、30、60、120分であったこと以外は実施例72と同様に経口投与による本発明の化合物の気道収縮に対する作用を求めた。結果は、表4に示す。本発明の化合物は何れも気管収縮を抑制する作用に優れているにもかかわらず、血圧に与える影響が少ないことが判る。尚、血圧の降下値は120分のものであり、比較のテオフィリンの投与量は100mg/kgであった。更に、100mg/kgの投与量に於いて死亡例を認めず、従って、本発明の化合物の安全性は高いものと考えられる。
【0234】
【表4】
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a novel pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine compound, a production method and production intermediate of this compound, and a pharmaceutical comprising this compound as an active ingredient.
[0002]
[Prior art]
Currently, bronchodilation with xanthine bronchodilators, such as theophylline, is mainly used to prevent and treat respiratory diseases such as asthma. In addition, beta-receptor stimulants such as ephedrine hydrochloride Was symptomatically used.
[0003]
However, all of the above drugs have serious side effects and have been problematic. However, since no excellent drugs that can replace these drugs have been found, it has been unavoidable to administer these drugs.
[0004]
On the other hand, examples of the compound having a pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine skeleton include 3-cyano-5-methylpyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidines. Are known to have excellent vasodilatory action and tracheal (branch) dilator action (Japanese Patent Publication No. 6-88999). However, this compound is difficult to separate the action on the circulatory organ such as the blood pressure lowering action and the action on the trachea (branch), and the development of a drug that selectively acts on the trachea (branch) has been desired.
[0005]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide a medicament having few side effects and excellent in the prevention / treatment effect of respiratory diseases.
[0006]
[Means for Solving the Problems]
In view of such circumstances, the present inventor has sought for a compound effective for the prevention and treatment of respiratory diseases, and conducted intensive research such as synthesis and screening. As a result, the novel compound represented by the following general formula (1) or a compound thereof The present invention was completed by finding that salt has an excellent tracheal (branch) dilating action and airway contraction-inhibiting action and is useful as a preventive / therapeutic agent for respiratory diseases because of its weak action on the circulatory system.
[0007]
That is, the present invention provides the following general formula (1)
[0008]
[Chemical 8]
[0009]
[In the formula, R1Represents a linear, branched or cyclic alkyl group, R2Is a hydrogen atom, halogen atom, substituentAs hydroxy group or dinitrobenzyloxy groupAlkyl group and substituent which may haveAs alkyl groupAn amino group optionally havingPyrrolidino group, piperidino group, morpholino group,Carboxyl group, alkoxycarbonyl group or carbamoylGroupRThreeIs a nitro groupOr trifluoroacetyl groupIndicates
The pyrrolopyrazolopyrimidine compound represented by these, or its salt is provided.
[0010]
The present invention also provides a medicament comprising the compound (1) or a salt thereof as an active ingredient.
[0011]
Furthermore, the present invention provides a process for producing the above compound (1) or a salt thereof and a novel production intermediate.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
In the general formula (1), R1As the linear, branched or cyclic alkyl group represented by the formula, those having 1 to 10 carbon atoms are preferable, those having 2 to 8 carbon atoms are more preferable, and those having 3 to 7 carbon atoms are particularly preferable. Among the alkyl groups, examples of the linear or branched alkyl group include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, Examples include n-pentyl group, isopentyl group, tert-pentyl group, 1-ethylpropyl group, n-hexyl group, isohexyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decyl group, and the like. Among these, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, n-pentyl group, tert-pentyl group (tert-amyl group), 1-ethyl A propyl group, an n-hexyl group, and an n-heptyl group are particularly preferable. Examples of the cyclic alkyl group include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group. Among these, a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, and a cyclohexyl group are particularly preferable.
[0013]
R2Examples of the halogen atom represented by the formula include a fluorine atom, a chlorine atom, and a bromine atom, and among these, a fluorine atom and a chlorine atom are preferable. As the alkyl group, a linear or branched alkyl group having 1 to 10 carbon atoms is preferable, and a linear or branched alkyl group having 1 to 6 carbon atoms is more preferable. Examples of the alkyl group include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, and an n-hexyl group. Of these, a methyl group, an ethyl group, an isopropyl group and the like are particularly preferable. Examples of the alkyl group having a substituent include an alkoxyalkyl group, an aralkyloxyalkyl group, an aryloxyalkyl group, an aminoalkyl group which may have a substituent (for example, an aminoalkyl group, a mono- or di-alkylaminoalkyl group, Examples of the hetero atom constituting the ring include a 4- to 7-membered cyclic amino-substituted alkyl group which may further have an oxygen atom or a nitrogen atom), and a hydroxyalkyl group. Specific examples include a methoxymethyl group and an ethoxymethyl group. , Dinitrobenzyloxymethyl group, benzyloxymethyl group, phenoxymethyl group, aminomethyl group, methylaminomethyl group, dimethylaminomethyl group, morpholinomethyl group, piperazinomethyl group, 4-methylpiperazinomethyl group, hydroxymethyl group, etc. Is mentioned. The amino group which may have a substituent includes an amino group, a mono- or dialkylamino group, and a cyclic amino group (for example, an oxygen atom or a nitrogen atom may further be included as a hetero atom constituting the ring). A 4- to 7-membered cyclic amino group), an alkylsulfonylamino group optionally substituted by a halogen atom, an arylsulfonylamino group, an alkylcarbonylamino group, an arylcarbonylamino group, or an optionally substituted ureido group , A thioureido group which may have a substituent, and a hydrazino group which may have a substituent. Here, examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. Moreover, as a substituent of a ureido group, a thioureido group, and a hydrazino group, R1And a linear, branched or cyclic alkyl group similar to those described above. Specific examples of the amino group which may have a substituent include an amino group, a methylamino group, an ethylamino group, a dimethylamino group, a diethylamino group, a cyclopropylamino group, a cyclobutylamino group, a pyrrolidino group, and a piperidino group. , Morpholino group, piperazino group, methanesulfonylamino group, trifluoromethanesulfonylamino group, benzenesulfonylamino group, acetylamino group, benzoylamino group, ureido group, methylureido group, thioureido group, methylthioureido group, hydrazino group, methylhydra Examples include a dino group. Moreover, as an alkoxycarbonyl group, a C2-C11 alkoxycarbonyl group is preferable and a C2-C7 alkoxycarbonyl group is more preferable. Examples of the alkoxycarbonyl group include a methoxycarbonyl group, an ethoxycarbonyl group, and an isopropyloxycarbonyl group. Moreover, as an alkylcarbamoyl group, a C2-C11 alkylcarbamoyl group is preferable and a C2-C7 alkylcarbamoyl group is more preferable. Examples of the alkylcarbamoyl group include a methylcarbamoyl group, an ethylcarbamoyl group, an isopropylcarbamoyl group, a dimethylcarbamoyl group, and a diethylcarbamoyl group.
[0017]
  R ThreeGroup represented byIsNitro groupOrLifluoroacetyl groupAndOf these, a nitro group is more preferred.
[0018]
  Specific examples of the compound (1) include, for example, 8-tert-butyl-6,7-dihydro-5-methyl-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5- a] pyrimidine (compound 1), 8-tert-amyl-6,7-dihydro-5-methyl-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (compound 2) ), 8-cyclopentyl-6,7-dihydro-5-methyl-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 3), 8-cyclohexyl-6, 7-dihydro-5-methyl-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (compound 4), 8-sec-butyl-6,7-dihydro-5 Methyl-3-nitro-8H-pyrrolo [3,2-e] pyrazo [1,5-a] pyrimidine (Compound 5)5-Amino-8-cyclopentyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (compound 19), 5-amino-8-sec-butyl -6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (compound 20), ethyl 8-cyclopentyl-6,7-dihydro-3-nitro- 8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylate (Compound 21), ethyl 8-sec-butyl-6,7-dihydro-3-nitro-8H-pyrrolo [ 3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylate (compound 22), 8-cyclopentyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] Limidine-5-carboxylic acid (Compound 23), 8-sec-butyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carvone Acid (Compound 24), 8-tert-butyl-6,7-dihydro-5-methyl-3-trifluoroacetyl-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 25) ), 8-tert-amyl-6,7-dihydro-5-methyl-3-trifluoroacetyl-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 26), 8- Cyclopentyl-6,7-dihydro-5-methyl-3-trifluoroacetyl-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (compound 27), 8-cyclohexyl-6,7- Dihydro-5-methyl -3-Trifluoroacetyl-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 28), 8-sec-butyl-6,7-dihydro-5-methyl-3-tri Fluoroacetyl-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 29), 8-Tert-butyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (compound 37), 8-cyclopentyl-6,7-dihydro-3 -Nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (compound 38), 8-sec-butyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2 -E] pyrazolo [1,5-a] pyrimidine (compound 39), 8-tert-butyl-5-chloro-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1 , 5-a] pyrimidine (compound 40), 5-chloro-8-cyclopentyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (compound 41), 8-sec-butyl-5-chloro-6,7 Dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 42), 8-sec-butyl-6,7-dihydro-5-methoxymethyl-3-nitro -8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (compound 43), 8-sec-butyl-6,7-dihydro-5-ethoxymethyl-3-nitro-8H-pyrrolo [ 3,2-e] pyrazolo [1,5-a] pyrimidine (compound 44), 5-benzyloxymethyl-8-sec-butyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2- e] pyrazolo [1,5-a] pyrimidine (compound 45), 8-sec-butyl-6,7-dihydro-3-nitro-5-phenoxymethyl-8H-pyrrolo [3,2-e] pyrazolo [1 , 5-a] pyrimidine (Compound 46), 5- Aminomethyl-8-sec-butyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 47), 8-sec-butyl-6 , 7-Dihydro-5-methylaminomethyl-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 48), 8-sec-butyl-6,7-dihydro -5-dimethylaminomethyl-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 49), 8-sec-butyl-6,7-dihydro-5-morpholino Methyl-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 50), 8-sec-butyl-6,7-dihydro-3-nitro-5-piperazinomethyl- 8H-pyrrolo [3,2-e] pyrazo [1,5-a] pyrimidine (Compound 51), 8-sec-butyl-6,7-dihydro-5- (4-methylpiperazinomethyl) -3-nitro-8H-pyrrolo [3,2-e Pyrazolo [1,5-a] pyrimidine (Compound 52), 8-sec-butyl-6,7-dihydro-5-hydroxymethyl-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1, 5-a] pyrimidine (compound 53), 8-sec-butyl-6,7-dihydro-5-methylamino-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 54), 8-sec-butyl-6,7-dihydro-5-ethylamino-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 55), 8-sec-butyl-6,7-dihydro-5-dimethylamino -3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (compound 56), 8-sec-butyl-5-diethylamino-6,7-dihydro-3-nitro-8H -Pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 57), 8-sec-butyl-5-cyclopropylamino-6,7-dihydro-3-nitro-8H-pyrrolo [3 , 2-e] pyrazolo [1,5-a] pyrimidine (Compound 58), 8-sec-butyl-5-cyclobutylamino-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e Pyrazolo [1,5-a] pyrimidine (Compound 59), 8-sec-butyl-6,7-dihydro-3-nitro-5-pyrrolidino-8H-pyrrolo [3,2-e] pyrazolo [1,5 -A] pyrimidine (compound 60), 8-sec-buty Ru-6,7-dihydro-3-nitro-5-piperidino-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 61), 8-sec-butyl-6,7- Dihydro-5-morpholino-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 62), 8-sec-butyl-6,7-dihydro-3-nitro- 5-piperazino-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 63), 8-sec-butyl-6,7-dihydro-5-methanesulfonylamino-3-nitro- 8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 64), 8-sec-butyl-6,7-dihydro-3-nitro-5-trifluoromethanesulfonylamino-8H-pyrrolo [3,2-e] pyrazolo [ , 5-a] pyrimidine (compound 65), 5-benzenesulfonylamino-8-sec-butyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a Pyrimidine (Compound 66), 5-acetylamino-8-sec-butyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 67) ), 5-benzoylamino-8-sec-butyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 68), 8-sec -Butyl-6,7-dihydro-3-nitro-5-ureido-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 69), 8-sec-butyl-6,7 -Dihydro-5-methylureido-3-nitrate -8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 70), 8-sec-butyl-6,7-dihydro-3-nitro-5-thioureido-8H-pyrrolo [3 , 2-e] pyrazolo [1,5-a] pyrimidine (Compound 71), 8-sec-butyl-6,7-dihydro-5-methylthioureido-3-nitro-8H-pyrrolo [3,2-e] Pyrazolo [1,5-a] pyrimidine (Compound 72), 8-sec-butyl-6,7-dihydro-5-hydrazino-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5- a] Pyrimidine (Compound 73), 8-sec-butyl-6,7-dihydro-5-methylhydrazino-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine ( Compound 74), 8-sec-butyl-5-carbamoi Ru-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 75), ethyl 8-cyclopropyl-6,7-dihydro-3- Nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-e] pyrimidine-5-carboxylate (compound 76), ethyl 8-cyclobutyl-6,7-dihydro-3-nitro-8H-pyrrolo [ 3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylate (compound 77), ethyl 6,7-dihydro-8-isopropyl-3-nitro-8H-pyrrolo [3,2-e] Pyrazolo [1,5-a] pyrimidine-5-carboxylate (Compound 78), ethyl 6,7-dihydro-8- (1-ethylpropyl) -3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1, 5-a] pyrimidine-5-carboxylate (compound 79), 8-cyclopropyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine- 5-carboxylic acid (compound 80), 8-cyclobutyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylic acid (compound 81) ), 6,7-dihydro-8-isopropyl-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylic acid (compound 82), 6,7-dihydro -8- (1-ethylpropyl) -3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylic acid (Compound 83), 5-amino-8-cyclo Propyl-6,7-dihydride -3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (compound 84), 5-amino-8-cyclobutyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (compound 85), 5-amino-6,7-dihydro-8-isopropyl-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 86), 5-amino-6,7-dihydro-8- (1-ethylpropyl) -3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1, 5-a] pyrimidine (compound 87), 8-sec-butyl-6,7-dihydro-5- (2 ', 4'-dinitrobenzyloxymethyl) -3-nitro-8H-pyrrolo [3,2-e Pyrazolo [1,5-a] pyrimidine (Compound 8 ) And the like.
[0019]
The salt that can be used in the present invention is not particularly limited as long as it is physiologically acceptable. For example, mineral salts such as hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, citric acid, oxalic acid, Preferred examples include organic acid salts such as fumaric acid, maleic acid, formic acid, acetic acid, methanesulfonic acid, benzenesulfonic acid, and paratoluenesulfonic acid, and carbonates.
[0020]
The compound (1) of the present invention also includes solvates such as hydrates.
[0021]
Compound (1) of the present invention can be produced, for example, according to the following reaction formula.
[0022]
[Chemical 9]
[0023]
[In the formula, R1, R2And RThreeRepresents the same as above, and X represents a halogen atom.
[0024]
That is, the substituent (R2, RThree) Or a tautomer thereof is reacted with a halogenating agent such as phosphoryl chloride to obtain a dihalogen (2).2-R1) Can be reacted to cyclize to produce compound (1). Further, R in the general formula (1)1~ RThreeThese groups can be converted into various substituents by a conventional method. In addition, after converting compound (3) to compound (2), R2Or RThreeThese substituents may be converted to other substituents and then used as the compound (1).
[0025]
Here, as a tautomer of the compound (3), one having the following structure may be mentioned.
[0026]
Embedded image
[0027]
[In the formula, R2And RThreeIs the same as above)
Here, the compound (3) can be produced by the following method (1) or method (2).
[0028]
Method (1):
[0029]
Embedded image
[0030]
[In the formula, R2And RThreeIs the same as above)
That is, the compound (3) can be obtained by condensing the aminopyrazole derivative (4) and the carbonyl lactone derivative (5) using a Lewis acid or the like as a catalyst and ring-closing by alkali treatment as necessary.
[0031]
Method (2):
R of compound (3)2Compound (3-1) in which is a hydroxyl group can be produced according to the following reaction formula.
[0032]
Embedded image
[0033]
[In the formula, RThreeIs the same as above, TBDMSi represents a tert-butyldimethylsilyl group, and Et represents an ethyl group.
[0034]
That is, after bromoethanol is t-butyldimethylsilylated with tert-butyldimethylsilyl chloride, diethyl malonate is condensed in the presence of an alkali such as sodium ethoxide, and then this is reacted with aminopyrazole. R2A compound (3) in which is a hydroxyl group can be obtained.
[0035]
When a halogenating reagent is allowed to act on the compound (3), the dihalogen (2) can be obtained. Although it does not specifically limit as a halogenating reagent used here, For example, phosphorus oxychloride etc. are mentioned. The halogenating reagent is generally used in an amount of 1.0 to 10.0 mol, preferably 2.0 to 5.0 mol, relative to compound (3). The solvent used in the reaction is not particularly limited as long as it is a non-aqueous solvent, and specific examples include N, N-dimethylformamide, chloroform, dichloromethane and the like. Further, when the halogenating reagent is a liquid, the reaction can be carried out without a solvent. A basic catalyst can be used to promote the progress of the reaction. Alternatively, the reaction may be performed in a nitrogen stream. The reaction temperature varies depending on the physical properties of the solvent, halogenating reagent, and catalyst, but heating to reflux is preferred. The workup and purification of the reaction may be performed according to a general method. However, in some cases R2, RThreeIt is necessary to pay attention to the decomposition of.
R2When phosphorus oxyhalide is allowed to act on compound (3) in which is a hydroxyl group, R2Compound (2) in which is a halogen atom can be obtained.
And R2And / or RThreeCan be converted into various substituents.
[0036]
The following general formula (6) including the compounds of the above general formulas (2) and (3)
[0037]
Embedded image
[0038]
[In the formula, Z represents a hydroxyl group or a halogen atom, Y represents a hydroxyl group or a halogen atom, R2And RThreeIs the same as above)
The pyrazolopyrimidine derivative represented by the formula (1) or a tautomer thereof is a novel compound and is an important compound as a production intermediate of the compound (1) of the present invention.
[0039]
In this compound (6), Z represents a hydroxyl group or a halogen atom such as a chlorine atom, a bromine atom or an iodine atom, and among the halogen atoms, a chlorine atom is preferred. Y represents a hydroxyl group or the above halogen atom, and among the halogen atoms, a chlorine atom is preferable. If these compounds (6) are illustrated, for example, 7-chloro-6- (2-chloroethyl) -5-methyl-3-nitropyrazolo [1,5-a] pyrimidine, ethyl 6- (2-hydroxyethyl) ) -5-methylpyrazolo [1,5-a] pyrimidine-7 (4H) -one-3-carboxylate, ethyl 7-chloro-6- (2-chloroethyl) -5-methylpyrazolo [1,5-a] pyrimidine -3-carboxylate, ethyl 7-chloro-6- (2-chloroethyl) -3-nitropyrazolo [1,5-a] pyrimidine-5-carboxylate, 7-bromo-6- (2-bromoethyl) -5 Methyl-3-nitropyrazolo [1,5-a] pyrimidine, 7-chloro-6- (2-chloroethyl) -5-ethyl-3-nitropyrazolo [1,5-a] pyrimidine 7-chloro-6- (2-chloroethyl) -5-n-propyl-3-nitropyrazolo [1,5-a] pyrimidine, 7-chloro-6- (2-chloroethyl) -5-isopropyl-3- Nitropyrazolo [1,5-a] pyrimidine, 7-chloro-6- (2-chloroethyl) -5-cyclopropyl-3-nitropyrazolo [1,5-a] pyrimidine, 5-n-butyl-7-chloro-6 -(2-chloroethyl) -3-nitropyrazolo [1,5-a] pyrimidine, 5-t-butyl-7-chloro-6- (2-chloroethyl) -3-nitropyrazolo [1,5-a] pyrimidine, 7 -Chloro-6- (2-chloroethyl) -5-cyclopentyl-3-nitropyrazolo [1,5-a] pyrimidine, ethyl 5-ethyl-6- (2-hydroxyethyl) pyrazolo [1, 5-a] pyrimidin-7 (4H) -one-3-carboxylate, ethyl 6- (2-hydroxyethyl) -5-n-propylpyrazolo [1,5-a] pyrimidin-7 (4H) -one -3-carboxylate, ethyl 6- (2-hydroxyethyl) -5-isopropylpyrazolo [1,5-a] pyrimidin-7 (4H) -one-3-carboxylate, ethyl 6- (2-hydroxyethyl) ) -5-cyclopropylpyrazolo [1,5-a] pyrimidin-7 (4H) -one-3-carboxylate, ethyl 5-n-butyl-6- (2-hydroxyethyl) pyrazolo [1,5- a] Pyrimidin-7 (4H) -one-3-carboxylate, ethyl 5-t-butyl-6- (2-hydroxyethyl) pyrazolo [1,5-a] pyrimidine-7 (4H)- On-3-carboxylate, ethyl 6- (2-hydroxyethyl) -5-cyclopentylpyrazolo [1,5-a] pyrimidine-7 (4H) -one-3-carboxylate, methyl 6- (2-hydroxy Ethyl) -5-methylpyrazolo [1,5-a] pyrimidine-7 (4H) -one-3-carboxylate, n-propyl 6- (2-hydroxyethyl) -5-methylpyrazolo [1,5-a] pyrimidine -7 (4H) -one-3-carboxylate, t-butyl 6- (2-hydroxyethyl) -5-methylpyrazolo [1,5-a] pyrimidin-7 (4H) -one-3-carboxylate, ethyl 7-Bromo-6- (2-bromoethyl) -5-methylpyrazolo [1,5-a] pyrimidine-3-carboxylate, ethyl 7-chloro-6- 2-chloroethyl) -5-ethylpyrazolo [1,5-a] pyrimidine-3-carboxylate, ethyl 7-chloro-6- (2-chloroethyl) -5-n-propylpyrazolo [1,5-a] pyrimidine -3-carboxylate, ethyl 7-chloro-6- (2-chloroethyl) -5-isopropylpyrazolo [1,5-a] pyrimidine-3-carboxylate, ethyl 7-chloro-6- (2-chloroethyl) -5-cyclopropylpyrazolo [1,5-a] pyrimidine-3-carboxylate, ethyl 5-t-butyl-7-chloro-6- (2-chloroethyl) pyrazolo [1,5-a] pyrimidine-3 -Carboxylate, methyl 7-chloro-6- (2-chloroethyl) -5-methylpyrazolo [1,5-a] pyrimidine-3-carboxylate n-propyl 7-chloro-6- (2-chloroethyl) -5-methylpyrazolo [1,5-a] pyrimidine-3-carboxylate, t-butyl 7-chloro-6- (2-chloroethyl) -5-methylpyrazolo [1,5-a] pyrimidine-3-carboxylate, ethyl 7-bromo-6- (2-bromoethyl) -3-nitropyrazolo [1,5-a] pyrimidine-5-carboxylate, methyl 7-chloro-6 -(2-Chloroethyl) -3-nitropyrazolo [1,5-a] pyrimidine-5-carboxylate, n-butyl 7-chloro-6- (2-chloroethyl) -3-nitropyrazolo [1,5-a] pyrimidine -5-carboxylate, t-butyl 7-chloro-6- (2-chloroethyl) -3-nitropyrazolo [1,5-a] pyrimidine- -Carboxylate, 6- (2-chloroethyl) -5,7-dichloro-3-nitropyrazolo [1,5-a] pyrimidine, 7-chloro-6- (2-chloroethyl) -5- (2 ', 4' -Dinitrobenzyloxymethyl) -3-nitropyrazolo [1,5-a] pyrimidine and the like.
[0040]
The compound (1) of the present invention contains an amine [NH2-R1] To cause ring closure, and if desired, R2And / or RThreeCan be produced by converting into various substituents.
[0041]
Here, the amine is usually used in an amount of 0.1 to 10.0 mol, preferably 1.0 to 2.5 mol, relative to the dihalogen (2). As the condensing agent for the reaction, tertiary organic amines and inorganic bases are used. Specific examples include triethylamine, N, N-diisopropylethylamine, anhydrous potassium carbonate, anhydrous sodium carbonate and the like. These condensing agents are generally used in an amount of 0.5 to 30.0 mol, preferably 2.0 to 5.0 mol, relative to the compound represented by the general formula (2). In addition, raw material amine R1-NH2A large excess of can be used to eliminate the need for a condensing agent. The solvent used in the reaction is not particularly limited as long as it is a non-aqueous solvent capable of dissolving two raw materials, and specific examples include N, N-dimethylformamide, chloroform, and dichloromethane. Specifically, the amount of the solvent used may be 5 to 100 times the amount of these raw material compounds. These solvents can be used alone or in combination of two or more. The selection of the solvent may be performed in accordance with the physical properties of the raw material compound and the condensing agent. The reaction temperature of this production method may be any temperature from room temperature to a temperature near the boiling point, but room temperature is preferred. The reaction time of this production method varies depending on various conditions, but requires 30 minutes to 30 days. As for the post-treatment and purification method of the reaction, a general method, for example, quenching with water, solvent extraction, column chromatography, recrystallization and the like may be combined appropriately. After the compound represented by the general formula (1) is obtained, the substituent R2, RThreeAs for, various chemical transformations such as reduction and hydrolysis can be performed.
[0042]
Compound (1) can be converted to a salt by a conventional method such as mixing with an acid in a polar or nonpolar solvent.
The compound (1) thus obtained or a salt thereof can be purified by a usual method such as column chromatography or recrystallization.
[0043]
Compound (1) or a salt thereof has an excellent bronchodilator action and airway contraction inhibitory action as shown in the following test examples, and has a weak effect on the circulatory system, so bronchial asthma, chronic obstructive pulmonary disease, It is useful as a medicine for the treatment and prevention of respiratory diseases such as bronchitis and pneumonia.
[0044]
Compound (1) or a salt thereof can be used as a medicine by itself, but can also be used in various dosage forms (compositions) which are usually used as a medicine. Examples of such dosage forms include inhalation agents, injections, oral administration agents, and rectal administration agents.
[0045]
In addition to the compound (1) or a salt thereof, the pharmaceutical agent of the present invention in these dosage forms can contain optional components that are usually used for formulation. Examples of such optional components include excipients, binders, coating agents, lubricants, sugar coatings, disintegrating agents, extenders, flavoring agents, emulsifying / solubilizing / dispersing agents, stabilizers, and pH adjustments. Agents, isotonic agents and the like. In addition to these, the medicament of the present invention can also contain known drugs, such as theophylline, which are usually used in the treatment and prevention of respiratory diseases. The medicament of the present invention can be produced according to a conventional method using these components.
[0046]
The preferred dose of the medicament of the present invention varies depending on symptoms, disease types, sex, age, physique, etc., but generally 1 to 1000 mg per day for an adult is preferred as the compound (1) or a salt thereof. It is preferable to administer once to several times a day.
[0047]
【The invention's effect】
The compound (1) of the present invention or a salt thereof has an excellent tracheal (branch) dilating action and airway contraction suppressing action, and also has a weak action on the circulatory system, so that asthma, chronic obstructive pulmonary disease, bronchitis, pneumonia, etc. It is useful for the prevention and treatment of respiratory diseases.
[0048]
【Example】
  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated further in detail, this invention is not limited to these.However, the compounds 6 to 18 and the compounds 30 to 36 are described only as reference examples, and do not belong to the technical scope of the present invention.
[0049]
Reference example 1
Preparation of 3-{[1- (tetrahydro-2-oxo-3-furyl) ethylidene] amino} pyrazole:
Boron trifluoride methanol complex 0 was prepared by dissolving 0.83 g (10.00 mmol) of 3-aminopyrazole and 1.92 g (15.00 mmol) of 2-acetyl-γ-butyrolactone in 12 ml of dry ethanol and stirring the mixture at room temperature. 0.1 ml was added, followed by stirring for 4 hours under the same conditions. The precipitated solid was collected by filtration, washed with ethanol, and air-dried to obtain 1.34 g (yield 69.4%) of the desired product.
[0050]
1H-NMR (DMSO-d6, Ppm)
2.45 (3H, s), 2.86 (2H, t, J = 7.8 Hz), 4.27 (2H, t, J = 7.8 Hz), 6.07 (1H, d, J = 2) .2 Hz), 6.67 (1 H, d, J = 2.2 Hz), 10.00 (1 H, s), 12.46 (1 H, brs)
[0051]
Reference example 2
Preparation of 6- (2-hydroxyethyl) -5-methylpyrazolo [1,5-a] pyrimidin-7 (4H) -one:
1.17 g (6.04 mmol) of 3-{[1- (tetrahydro-2-oxo-3-furyl) ethylidene] amino} pyrazole was suspended in 7.5 ml of water, and 0.73 g (7.23 mmol) of triethylamine was suspended therein. And stirred at an oil bath temperature of 100 ° C. for 2 hours. Thereafter, the mixture was cooled with ice-water, concentrated hydrochloric acid was added with stirring to near pH 2 (solid precipitation), and saturated aqueous sodium hydrogen carbonate was further added to near pH 4. The insoluble solid was collected by filtration, washed several times with water, and air-dried to obtain 1.06 g (yield 90.6%) of the desired product.
[0052]
1H-NMR (CDClThree+ CDThreeOD, ppm)
2.38 (3H, s), 2.81 (2H, t, J = 6.5 Hz), 3.74 (2H, t, J = 6.5 Hz), 5.97 (1H, d, J = 2) .0Hz), 7.80 (1H, d, J = 2.0 Hz)
[0053]
Reference example 3
Preparation of 7-chloro-6- (2-chloroethyl) -5-methylpyrazolo [1,5-a] pyrimidine:
6.30 g (27.46 mmol) of 6- (2-hydroxyethyl) -5-methylpyrazolo [1,5-a] pyrimidin-7 (4H) -one and 8.5 ml of triethylamine (d = 0.726, 61.10 mmol) ), 8.5 ml of phosphorus oxychloride (d = 1.645, 91.19 mmol) was added dropwise over 2 minutes with stirring in an ice-cooled, nitrogen atmosphere, followed by 1 at an oil bath temperature of 100 ° C. Stir for hours. After cooling with ice-water, the reaction solution was dissolved in 100 ml of chloroform and poured into 500 ml of ice-water. After well shaking, the chloroform layer was separated, the aqueous layer was further extracted with chloroform (100 ml × 2), all the chloroform layers were combined, dried over sodium sulfate, and the solvent was distilled off. The residue was subjected to silica gel column chromatography (chloroform) to obtain 3.78 g (yield 59.8%) of the desired product.
[0054]
1H-NMR (CDClThree, Ppm)
2.71 (3H, s), 3.35 (2H, t, J = 7.5 Hz), 3.76 (2H, t, J = 7.5 Hz), 6.67 (1H, d, J = 2) .4 Hz), 8.15 (1H, d, J = 2.4 Hz)
[0055]
Example 1
Preparation of 7-chloro-6- (2-chloroethyl) -5-methyl-3-nitropyrazolo [1,5-a] pyrimidine:
While cooling with ice-water-salt system in 46 ml of concentrated sulfuric acid, 23 ml of 90% nitric acid was added dropwise over 3 minutes and 30 seconds with stirring in a nitrogen atmosphere, and then 7-chloro-6 with stirring at around -5 ° C. -(2-Chloroethyl) -5-methylpyrazolo [1,5-a] pyrimidine (5.0 g, 21.74 mmol) was added little by little for 10 minutes and 30 seconds and stirred at -5 to 5 ° C for 5 hours. did. Thereafter, the reaction solution was poured into 800 ml of ice-water and stirred for about 45 minutes. The precipitated solid was collected by filtration, washed several times with water and air-dried to obtain 5.65 g (yield 94.5%) of the desired product. It was.
[0056]
m. p.
172.1-174.2 ° C
IR (KBr tablet, cm-1)
1620, 1502, 1481, 1403, 1383, 1315, 1213
1H-NMR (CDClThree, Ppm)
2.91 (3H, s), 3.43 (2H, t, J = 7.0 Hz), 3.83 (2H, t, J = 7.0 Hz), 8.80 (1H, s)
[0057]
Example 2
Compound 1 (R1: Tert-butyl, R2: Methyl, RThree: Nitro) Production:
Preparation of 8-tert-butyl-6,7-dihydro-5-methyl-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine:
1.75 g (6.36 mmol) of 7-chloro-6- (2-chloroethyl) -5-methyl-3-nitropyrazolo [1,5-a] pyrimidine was dissolved in 18 ml of dry dimethylformamide, and tert-butylamine 0 .93 g (12.72 mmol) and triethylamine 1.61 g (15.94 mmol) were sequentially added, and the mixture was stirred at room temperature for 6 hours. Thereafter, the reaction solution was poured into water and extracted with ethyl acetate (150 ml × 2). All the ethyl acetate layers were combined, washed with saturated brine, dried over magnesium sulfate, and the solvent was distilled off. The residue was subjected to silica gel column chromatography (hexane: ethyl acetate = 2: 1) and recrystallized from ethanol to obtain 0.78 g (yield 44.6%) of the desired product.
[0058]
1H-NMR (CDClThree, Ppm)
1.71 (9H, s), 2.47 (3H, s), 3.06 (2H, t, J = 9.2 Hz), 4.09 (2H, t, J = 9.2 Hz), 8. 61 (1H, s)
[0059]
Example 3
Compound 2 (R1: Tert-amyl, R2: Methyl, RThree: Nitro) Production:
Compound 2 was obtained in a yield of 37.8% from 7-chloro-6- (2-chloroethyl) -5-methyl-3-nitropyrazolo [1,5-a] pyrimidine and tert-amylamine in the same manner as in Example 2. .
[0060]
1H-NMR (CDClThree, Ppm)
0.89 (3H, t, J = 7.6 Hz), 1.64 (6H, s), 2.27 (2H, q, J = 7.6 Hz), 2.47 (3H, s), 3. 07 (2H, t, J = 9.0 Hz), 4.09 (2H, t, J = 9.0 Hz), 8.59 (1H, s)
[0061]
Example 4
Compound 3 (R1: Cyclopentyl, R2: Methyl, RThree: Nitro):
Compound 3 was obtained in a yield of 82.9% from 7-chloro-6- (2-chloroethyl) -5-methyl-3-nitropyrazolo [1,5-a] pyrimidine and cyclopentylamine in the same manner as in Example 2.
[0062]
IR (KBr tablet, cm-1)
1626, 1617, 1492, 1394, 1234, 1196
m. p.
228-234 ° C
1H-NMR (CDClThree, Ppm)
1.60 to 1.85 (6H, m), 1.90 to 2.10 (2H, m), 2.46 (3H, s), 3.16 (2H, t, J = 8.9 Hz), 3.92 (2H, t, J = 8.9 Hz), 5.81 (1H, m), 8.56 (1H, s)
[0063]
Example 5
Compound 4 (R1: Cyclohexyl, R2: Methyl, RThree: Nitro) Production:
Compound 4 was obtained in a yield of 76.6% from 7-chloro-6- (2-chloroethyl) -5-methyl-3-nitropyrazolo [1,5-a] pyrimidine and cyclohexylamine in the same manner as in Example 2.
[0064]
IR (KBr tablet, cm-1)
1622, 1613, 1491, 1454, 1441, 1397, 1245, 1231, 1199
m. p.
256.8 to 258.1 ° C
1H-NMR (CDClThree, Ppm)
1.00-1.30 (1H, m), 1.35-2.00 (9H, m), 2.46 (3H, s), 3.14 (2H, t, J = 9.0 Hz), 3.91 (2H, t, J = 9.0 Hz), 5.15-5.35 (1H, m), 8.57 (1H, s)
[0065]
Example 6
Compound 5 (R1: Sec-butyl, R2: Methyl, RThree: Nitro) Production:
7-chloro-6- (2-chloroethyl) -5-methyl-3-nitropyrazolo [1,5-a] pyrimidine and sec-butylamine were used to give compound 5 in a yield of 74.3% in the same manner as in Example 2. .
[0066]
IR (KBr tablet, cm-1)
1626, 1614, 1488, 1443, 1397, 1229, 1200, 1180
m. p.
257.9-260.1 ° C
1H-NMR (CDClThree, Ppm)
0.94 (3H, t, J = 7.4 Hz), 1.31 (3H, d, J = 6.8 Hz), 1.55 to 1.75 (2H, m), 2.48 (3H, s ), 3.17 (2H, t, J = 9.2 Hz), 3.73 to 3.95 (2H, m), 5.50 to 5.68 (1H, m), 8.58 (1H, s) )
[0067]
Example 7
Compound 6 (R1: Cyclopentyl, R2: Methyl, RThree: Amino) Production:
0.287 g of compound 3 was weighed, 0.95 g of anhydrous tin (II) chloride and 2 ml of dry ethanol were added thereto, and the mixture was stirred at 70 to 80 ° C. for 1 hour and 50 minutes in a nitrogen atmosphere. Cool with ice water, pour 20 ml of ethyl acetate and 30 ml of saturated multistory water under water-cooling, remove insoluble matter, wash several times with ethyl acetate, combine with the filtrate, separate the ethyl acetate layer, and wash the aqueous layer with ethyl acetate. After extraction, all the ethyl acetate layers were combined and dried over sodium sulfate, the solvent was distilled off, and the residue was recrystallized from ethyl acetate to obtain 0.114 g (yield 44.4%) of Compound 6. .
[0068]
IR (KBr tablet, cm-1)
3378, 1578, 1561, 1332
m. p.
134-134.5 ° C
1H-NMR (CDClThree, Ppm)
1.55-1.80 (6H, m), 1.80-2.05 (2H, m), 2.35 (3H, s), 3.07 (2H, t, J = 9.0 Hz), 3.77 (2H, t, J = 9.0 Hz), 5.88 to 6.05 (1H, m), 7.70 (1H, s)
[0069]
Example 8
Compound 7 (R1: Cyclopentyl, R2: Methyl, RThree: Acetylamino):
0.20 g of compound 3 was weighed and dissolved in 1.8 ml of acetic acid, 0.13 g of reduced iron was added at once as a solid, and then heated and stirred at 100 ° C. for 1 hour and 30 minutes in a nitrogen atmosphere. Thereafter, acetic acid was distilled off, and 10 ml of chloroform was added to the residue. Insoluble matter was removed by filtration, and the chloroform layer of the filtrate was separated. The aqueous layer was further extracted with chloroform, all the chloroform layers were combined, dried over sodium sulfate, and the solvent was distilled off to obtain 0.20 g (yield 95.2%) of Compound 7.
[0070]
IR (KBr tablet, cm-1)
3234, 1633, 1582, 1558, 1530, 1329, 1250, 1166
m. p.
233-234 ° C
1H-NMR (CDClThree, Ppm)
1.60 to 1.80 (6H, m), 1.85 to 2.05 (2H, m), 2.19 (3H, s), 2.33 (3H, s), 3.08 (2H, t, J = 9.2 Hz), 3.82 (2H, t, J = 9.2 Hz), 5.93 to 6.10 (1H, m), 8.28 (1H, brs), 8.58 ( 1H, s)
[0071]
Example 9
Compound 8 (R1: Cyclopentyl, R2: Methyl, RThreeProduction of trifluoromethanesulfonylamino):
Compound 6 (0.1 g) was dissolved in 2 ml of dry methylene chloride, and a solution of 0.13 g of trifluoromethanesulfonic anhydride in 2 ml of dry methylene chloride was added dropwise with stirring in a nitrogen atmosphere under ice water cooling. Stirring was continued for a minute. Pour into chloroform-cold saturated aqueous sodium bicarbonate, separate the chloroform layer, dry over sodium sulfate, evaporate the solvent, purify the residue by silica gel column chromatography (chloroform: methanol = 100: 0 → 100: 1), compound 0.13 g (yield: 86.7%) of 8 was obtained.
[0072]
IR (KBr tablet, cm-1)
1636, 1300, 1203, 1163
m. p.
178-179 ° C
1H-NMR (CDClThree, Ppm)
1.62-1.87 (6H, m), 1.90-2.10 (2H, m), 2.37 (3H, s), 3.11 (2H, t, J = 8.6 Hz), 3.96 (2H, t, J = 8.6 Hz), 5.95 to 6.10 (1H, m), 7.98 (1H, s)
[0073]
Example 10
Compound 9 (R1: Cyclopentyl, R2: Methyl, RThree: Trifluoroacetylamino):
0.257 g of Compound 6 was dissolved in 4.5 ml of dry pyridine, 0.42 ml of trifluoroacetic anhydride was added dropwise with stirring at room temperature under a nitrogen atmosphere, and the mixture was stirred for 1 hour and 10 minutes. The reaction solution was concentrated under reduced pressure, the residue was dissolved in 20 ml of chloroform, and this was poured into 30 ml of water. After making alkaline with saturated aqueous sodium bicarbonate, the chloroform layer was separated. After drying sodium sulfate, the solvent was distilled off. The residue was recrystallized from ethyl acetate to obtain 0.129 g (yield 36.5%) of Compound 9.
[0074]
IR (KBr tablet, cm-1)
1702, 1628, 1605, 1318, 1307, 1209, 1192, 1154
m. p.
175-176 ° C
1H-NMR (CDClThree, Ppm)
1.60 to 1.85 (6H, m), 1.85 to 2.10 (2H, m), 2.33 (3H, s), 3.10 (2H, t, J = 9.2 Hz), 3.85 (2H, t, J = 9.2 Hz), 5.90 to 6.08 (1H, m), 8.63 (1H, s)
[0075]
Example 11
Compound 10 (R1: Cyclopentyl, R2: Methyl, RThree: Methanesulfonylamino):
0.14 g of compound 6 was dissolved in 2 ml of dry methylene chloride, 0.2 ml of triethylamine was added with stirring under an ice-cooled nitrogen atmosphere, and a 2 ml dry methylene chloride solution of 75 mg of methanesulfonyl chloride was added dropwise. The mixture was stirred for 30 minutes in an ice-cooled nitrogen atmosphere, poured into 5 ml of chloroform and 30 ml of cold water, the chloroform layer was separated and dried over sodium sulfate, the solvent was distilled off, and the residue was purified by silica gel column chromatography (elution solvent: chloroform). Recrystallization from ethanol gave 0.105 g (yield 58.3%) of compound 10.
[0076]
IR (KBr tablet, cm-1)
1618, 1595, 1542, 1323, 1149
m. p.
172-174 ° C
1H-NMR (CDClThree, Ppm)
1.60 to 1.85 (6H, m), 1.85 to 2.05 (2H, m), 2.35 (3H, s), 3.04 (3H, s), 3.08 (2H, t, J = 9.9 Hz), 3.82 (2H, t, J = 9.9 Hz), 5.90 to 6.05 (1H, m), 8.04 (1H, s)
[0077]
Example 12
Compound 12 (R1: Cyclopentyl, R2: Methyl, RThree: Ethyloxalylamino) Production:
0.257 g of compound 6 was dissolved in 4 ml of dry methylene chloride, 0.37 ml of triethylamine was added with stirring under an ice-cooled nitrogen atmosphere, and further 164 mg of ethyl oxalyl chloride in 2 ml of dry methylene chloride was added dropwise. The mixture was stirred for 60 minutes under an ice-cooled nitrogen atmosphere, poured into 10 ml of chloroform and 50 ml of cold water, the chloroform layer was separated and dried over sodium sulfate, the solvent was distilled off, and the residue was purified by silica gel column chromatography (elution solvent: chloroform). Recrystallization from ethanol gave 0.271 g (yield 75.9%) of compound 12.
[0078]
IR (KBr tablet, cm-1)
3400, 1764, 1702, 1625, 1609, 1504
m. p.
185-186 ° C
1H-NMR (CDClThree, Ppm)
1.43 (3H, t, J = 7.0 Hz), 1.60 to 1.85 (6H, m), 1.85 to 2.05 (2H, m), 2.35 (3H, s), 3.10 (2H, t, J = 9.0 Hz), 3.83 (2H, t, J = 9.0 Hz), 4.42 (2H, q, J = 7.0 Hz), 5.90-6 .06 (1H, m), 8.69 (1H, s), 9.32 (1H, brs)
[0079]
Example 13
Compound 11 (R1: Cyclopentyl, R2: Methyl, RThree: Oxalylamino):
0.34 g of Compound 12 was suspended in 6.8 ml of methanol, and 1.3 ml of 1N sodium hydroxide aqueous solution was added thereto while stirring in an ice-cooled nitrogen atmosphere, and stirring was continued for 1 hour in an ice-cooled nitrogen atmosphere. Further, 6 ml of water was added and stirred at room temperature for 8 hours and 30 minutes. After adding 20 ml of methanol and stirring, the insoluble matter was collected by filtration, dried, dissolved in 300 ml of hot ethanol and filtered. After the solvent was distilled off, 15 ml of ethanol was added, and a 1N hydrogen chloride aqueous solution was further added to adjust the pH to around 3. It was. The precipitated solid was collected by filtration and dried to obtain 0.17 g (yield 54.8%) of Compound 11.
[0080]
IR (KBr tablet, cm-1)
3235, 2800 to 2350, 1681, 1625, 1547, 1496, 1346, 1296, 1173
m. p.
255 to 255.5 ° C
[0081]
Example 14
Compound 13 (R1: Tert-butyl, R2: Methyl, RThree: N- (1H-tetrazol-5-yl) carboxamide):
380 mg of Compound 34 described in Examples below was weighed, 3 ml of dry DMF was added, 280 mg of 1,1′-carbonyldiimidazole was added thereto, and the mixture was stirred at 90 ° C. for 30 minutes. 170 mg of -1H-tetrazole was added. The mixture was further stirred at 90 ° C. for 3 hours, after which the reaction solution was cooled to 0 ° C., water was added, and the mixture was acidified with concentrated hydrochloric acid. Thereafter, the reaction solution was neutralized with a saturated aqueous sodium hydrogen carbonate solution, and the precipitated crystals were collected by filtration and dried. The crystals were washed with chloroform and further dried to obtain 180 mg of compound 13. (Yield 38.2%)
[0082]
IR (KBr tablet, cm-1)
1667, 1580, 1502, 1303, 1201
1H-NMR (DMSO-d6, Ppm)
1.50 (9H, s), 2.31 (3H, s), 2.84 (2H, t, J = 8.9 Hz), 3.95 (2H, t, J = 8.9 Hz), 8. 42 (1H, s), 11.59 (1H, s), 15.80 (1H, brs)
[0083]
Example 15
Compound 14 (R1: Tert-amyl, R2: Methyl, RThree: N- (1H-tetrazol-5-yl) carboxamide):
In the same manner as in Example 14, 280 mg (yield: 60.0%) of Compound 14 was obtained from 400 mg of Compound 35 described in Examples below.
[0084]
IR (KBr tablet, cm-1)
1666, 1578, 1501, 1297, 1200
1H-NMR (DMSO-d6, Ppm)
0.90 (3H, t, J = 7.3 Hz), 1.67 (6H, s), 2.33 (2H, q, J = 7.3 Hz), 2.45 (3H, s), 3. 09 (2H, t, J = 8.9 Hz), 4.13 (2H, t, J = 8.9 Hz), 8.46 (1H, s), 11.89 (1H, s), 15.60 ( 1H, brs)
[0085]
Example 16
Compound 15 (R1: Cyclopentyl, R2: Methyl, RThree1H-tetrazol-5-yl):
1.62 g of 3-cyano-8-cyclopentyl-5-methyl-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine, 0.45 g of sodium azide, 0.51 g of ammonium acetate and 21 ml of dry DMF And stirred at 160 ° C. for 9 hours under a nitrogen atmosphere. In the middle, 0.45 g of sodium azide and 0.51 g of ammonium acetate were added appropriately. While stirring with ice water, 30 ml of water was added, concentrated hydrochloric acid was added to adjust the pH to 1, and the pH was adjusted to 4 to 5 with saturated aqueous sodium hydrogen carbonate. Extraction with chloroform, drying, concentration, and purification by silica gel column chromatography (elution solvent chloroform: methanol = 10: 0 → 30: 1) gave 0.54 g (yield 28.7%) of Compound 15.
[0086]
IR (KBr tablet, cm-1)
1625, 1581, 1322, 1259, 1201
m. p.
266.5 ° C. to 267.5 ° C.
1H-NMR (CDClThree, Ppm)
1.60 to 1.85 (6H, m), 1.85 to 2.10 (2H, m), 2.40 (3H, s), 3.14 (3H, t, J = 9.2 Hz), 3.90 (3H, t, J = 9.2 Hz), 5.54 (1H, brs), 5.80 to 6.00 (1H, m), 8.57 (1H, s)
[0087]
Example 17
Compound 16 (R1: Tert-butyl, R2: Methyl, RThree1H-tetrazol-5-yl):
0.42 g of compound 16 was prepared in the same manner as in Example 16 from 1.38 g of 8-tert-butyl-3-cyano-5-methyl-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine. (Yield 26.1%).
[0088]
IR (KBr tablet, cm-1)
1627, 1560, 1245, 1196
m. p.
270 ° C
1H-NMR (CDClThree: DMSO-d6= 4: 1, ppm)
1.75 (9H, s), 2.46 (3H, s), 3.06 (2H, t, J = 8.9 Hz), 4.08 (2H, t, J = 8.9 Hz), 5. 90 (1H, brs), 8.51 (1H, s)
[0089]
Example 18
Compound 17 (R1: Tert-amyl, R2: Methyl, RThree1H-tetrazol-5-yl):
0.46 g of compound 17 was obtained in the same manner as in Example 16 from 1.40 g of 8-tert-amyl-3-cyano-5-methyl-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine. (Yield 28.4%) was obtained.
[0090]
IR (KBr tablet, cm-1)
1633, 1569, 1256, 1186
m. p.
246 ° C
1H-NMR (DMSO-d6, Ppm)
0.86 (3H, t, J = 7.3 Hz), 1.64 (6H, s), 2.31 (2H, q, J = 7.3 Hz), 2.40 (3H, s), 3. 04 (2H, t, J = 8.7 Hz), 4.09 (2H, t, J = 8.7 Hz), 8.54 (1H, s)
[0091]
Example 19
Compound 18 (R1: Cyclopentyl, R2: Methyl, RThree: Carboxamide):
To 0.53 g of 3-cyano-8-cyclopentyl-6,7-dihydro-5-methyl-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine, add 2 ml of ethanol, and add 2 ml of water. 0.58 g of dissolved sodium hydroxide was added, and the mixture was heated to reflux for 8 hours under a nitrogen atmosphere. After cooling, 30 ml of water was added and the insoluble solid was collected by filtration and air-dried to obtain 0.33 g (yield 57.9%) of Compound 18.
[0092]
IR (KBr tablet, cm-1)
3334, 3135, 1656, 1616, 1590, 1518, 1465, 1330, 1259, 1196
m. p.
280 ° C or higher
1H-NMR (CDClThree, Ppm)
1.58 to 1.85 (6H, m), 1.85 to 2.05 (2H, m), 2.35 (3H, s), 3.11 (3H, t, J = 8.9 Hz), 3.85 (3H, t, J = 8.9 Hz), 5.45 (1H, brs), 5.85 to 6.00 (1H, m), 8.36 (1H, brs), 8.45 ( 1H, s)
[0093]
Example 20
Compound 19 (R1: Cyclopentyl, R2: Amino, RThree: Nitro) Production:
1.2 g of the compound 23 described in Examples below was suspended in 18 ml of dry acetone, and 0.65 ml of triethylamine was added with stirring in an ice-cooled nitrogen atmosphere. Subsequently, 0.47 g of ethyl chlorocarbonate was dissolved in 2 ml of dry acetone, added dropwise and stirred for 1 hour. Under this condition, 0.54 g of sodium azide was dissolved in 2 ml of water and added dropwise, followed by stirring for 1 hour, and then left for 2 hours. The reaction product was poured into 200 ml of water, and the insoluble material was collected by filtration and washed with water. This was suspended in 25 ml of toluene and heated and stirred at 125 ° C. for 4 hours. This was cooled with ice water, dissolved by adding 120 ml of chloroform, dried over sodium sulfate and concentrated. The residue was purified by silica gel column chromatography (elution solvent; chloroform: methanol = 100: 0 → 100: 1) and concentrated. The residue was dissolved in 100 ml of chloroform and extracted with 1N hydrochloric acid. The hydrochloric acid layer was made alkaline with sodium bicarbonate and extracted with chloroform to obtain 0.74 g (yield 67.9%) of Compound 19.
[0094]
IR (KBr tablet, cm-1)
3487, 3310, 3210, 1624, 1583, 1400, 1258, 1214
m. p.
279-280 ° C
1H-NMR (CDClThree, Ppm)
1.60 to 1.85 (6H, m), 1.85 to 2.05 (2H, m), 2.97 (2H, t, J = 8.9 Hz), 3.86 (3H, t, J = 8.9 Hz), 5.60-5.80 (1H, m), 5.72 (2H, brs), 8.42 (1H, s)
[0095]
Example 21
Compound 20 (R1: Sec-butyl, R2: Amino, RThree: Nitro) Production:
Compound 20 was produced in the same manner as in Example 20, using Compound 24 described in the Examples below as the starting material. Yield 45.8%
[0096]
IR (KBr tablet, cm-1)
1640, 1625, 1580, 1399, 1256
m. p.
201.5-203.1 ° C
1H-NMR (CDClThree, Ppm)
0.92 (3H, t, J = 7.6 Hz), 1.25 (3H, d, J = 6.5 Hz), 1.45 to 1.75 (2H, m), 2.98 (2H, t , J = 8.9 Hz), 3.79 (2H, s, J = 8.9 Hz), 5.41 (1H, s, J = 6.5 Hz), 6.14 (2H, brs), 8.40. (1H, s)
[0097]
Reference example 4
Preparation of ethyl (tetrahydro-2-oxo-3-furyl) glyoxylate:
Molecara Sieves 25.80 g of metallic sodium was added to 500 ml of dried ethanol and dissolved. Next, 148.21 g of diethyl oxalate was added, and the reaction system was cooled to -15 to -10 ° C. While maintaining this temperature, a solution of 88.79 g of γ-butyrolactone in 60 ml of ethanol was added dropwise and stirred for 2 hours, followed by stirring at room temperature for 16 hours. The reaction solution was poured into 1 L of ice water, adjusted to pH = 4-5 with concentrated hydrochloric acid, and extracted with chloroform. The chloroform layer was dried over anhydrous sodium sulfate, and the solvent was distilled off under reduced pressure. The crude product obtained here was distilled under reduced pressure to obtain a fraction at 150 to 160 ° C. (5 to 6 mmHg) as a target product. 156.21 g of slightly yellow liquid. Yield 83.1%.
[0098]
1H-NMR (CDClThree, Ppm)
1.39 (3H, t, J = 7.4 Hz), 3.30 (2H, t, J = 7.4 Hz), 4.37 (2H, q, J = 7.4 Hz), 4.50 (2H , T, J = 7.4 Hz), 10.92 (1H, br)
[0099]
Example 22
Preparation of ethyl 7-chloro-6- (2-chloroethyl) -3-nitropyrazolo [1,5-a] pyrimidine-5-carboxylate:
To a 32 ml acetic acid solution of 8.12 g (97.70 mmol) of 3-aminopyrazole, 8.12 g of synthetic zeolite A-4 powder was added while stirring at room temperature, and the ethyl (tetrahydro-) obtained in Reference Example 4 was further stirred with ice cooling. 2-Oxo-3-furyl) glyoxylate 8.19 g (97.78 mmol) in 40 ml acetic acid was added dropwise over 2 minutes, followed by stirring at room temperature for 4 hours. Thereafter, the insoluble material was removed by filtration, and the filtrate was concentrated under reduced pressure. Dissolve the residue in 150 ml of chloroform, pour into 700 ml of water, shake well and separate the chloroform layer. The aqueous layer is further extracted with chloroform (150 ml × 2). All the chloroform layers are combined, dried over sodium sulfate and evaporated. did. The residue was subjected to silica gel column chromatography (chloroform) and purified to obtain 5.36 g of ethyl 6- (2-hydroxyethyl) pyrazolo [1,5-a] pyrimidin-7 (4H) -one-5-carboxylate. It was. To this, 7 ml of phosphorus oxychloride (d = 1.645, 75.10 mmol) was added, and the mixture was stirred at an oil bath temperature of 100 ° C. for 40 minutes under a nitrogen atmosphere, followed by cooling to near room temperature, and 7 ml of triethylamine (d = 0.726, 50.32 mmol) was added and the mixture was stirred at an oil bath temperature of 100 ° C. for 30 minutes. After cooling with ice-water, add 100 ml of chloroform, pour into 600 ml of ice-water, shake well and separate the chloroform layer. The aqueous layer is further extracted with chloroform (100 ml × 2). Then, after the magnesium sulfate was dried, the solvent was distilled off. The residue was subjected to silica gel column chromatography (chloroform) to obtain 3.60 g of ethyl 7-chloro-6- (2-chloroethyl) pyrazolo [1,5-a] pyrimidine-5-carboxylate. To 14.2 ml of acetic anhydride, 1.60 ml of 90% nitric acid and 1 drop of concentrated sulfuric acid were sequentially added with stirring under ice cooling, followed by cooling to -10 ° C. To this was added dropwise a 4.30 ml acetic anhydride solution of 3.60 g of ethyl 7-chloro-6- (2-chloroethyl) pyrazolo [1,5-a] pyrimidine-5-carboxylate while maintaining the temperature at -5 to 0 ° C. After stirring for 20 minutes under the same conditions, the mixture was poured into 300 ml of ice-water and extracted with 400 ml of ethyl acetate. The organic layer was washed twice with saturated aqueous sodium hydrogen carbonate and once with saturated brine, dried over magnesium sulfate, and the solvent was evaporated. The residue was subjected to silica gel column chromatography (ethyl acetate: n-hexane = 1: 5, chloroform) to obtain 2.49 g (yield 7.6%) of the desired product.
[0100]
1H-NMR (CDClThree, Ppm)
1.49 (3H, t, J = 7.3 Hz), 3.61 (2H, t, J = 7.0 Hz), 3.85 (2H, t, J = 7.0 Hz), 4.56 (2H , Q, J = 7.3 Hz), 8.93 (1H, s)
[0101]
Example 23
Preparation of ethyl 8-cyclopentyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylate (Compound 21) (Part 1):
1. Dissolve 1.16 g (3.48 mmol) of ethyl 7-chloro-6- (2-chloroethyl) -3-nitropyrazolo [1,5-a] pyrimidine-5-carboxylate in 12 ml of dry dimethylformamide. 4 ml (d = 0.863, 24.32 mmol) was added and stirred at room temperature for 4 hours. Thereafter, the reaction solution was poured into ice-water, insoluble solids were collected by filtration, washed with water, and air-dried to obtain 1.15 g (yield 95.7%) of the desired product.
[0102]
1H-NMR (CDClThree, Ppm)
1.47 (3H, t, J = 7.3 Hz), 1.65 to 1.90 (6H, m), 1.95 to 2.15 (2H, m), 3.58 (2H, t, J = 8.9 Hz), 4.00 (2H, t, J = 8.9 Hz), 4.46 (2H, q, J = 7.3 Hz), 5.85 to 6.05 (1H, m), 8 .67 (1H, s)
[0103]
Example 24
Compound 21 (R1: Cyclopentyl, R2: Ethoxycarbonyl, RThree: Nitro) (part 2):
3.6 g of ethyl 7-chloro-6- (2-chloroethyl) pyrazolo [1,5-a] pyrimidine-5-carboxylate is dissolved in 48 ml of dry DMF and stirred at room temperature under a nitrogen atmosphere while 7.3 ml of cyclopentylamine. And stirred for 1 hour and 20 minutes. The reaction product was poured into 250 ml of ice water, the insoluble material was collected by filtration, air-dried, and ethyl 8-cyclopentyl-6,7-dihydro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5. -3.20 g (yield 85.3%) of carboxylate was obtained. 1.16 g of this was gradually added to a mixed acid prepared by mixing 7.8 ml of concentrated sulfuric acid and 3.9 ml of 90% nitric acid while stirring at -5 to 0 ° C. After stirring for 5 minutes under the same conditions, the reaction solution was poured into 200 ml of ice water and extracted with chloroform. The chloroform layer was dried over sodium sulfate and the solvent was distilled off. The residue was purified by silica gel column chromatography (ethyl acetate: n-hexane = 1: 1) to obtain 0.76 g of compound 21 (yield 57.0%). Obtained.
[0104]
1H-NMR (CDClThree, Ppm)
1.47 (3H, t, J = 7.3 Hz), 1.65 to 1.90 (6H, m), 1.95 to 2.15 (2H, m), 3.58 (2H, t, J = 8.9 Hz), 4.00 (2H, t, J = 8.9 Hz), 4.46 (2H, q, J = 7.3 Hz), 5.85 to 6.05 (1H, m), 8 .67 (1H, s)
[0105]
Example 25
Compound 22 (R1: Sec-butyl, R2: Ethoxycarbonyl, RThree: Nitro) Production:
In the same manner as in Example 23, Compound 22 was obtained from ethyl 7-chloro-6- (2-chloroethyl) -3-nitropyrazolo [1,5-a] pyrimidine-5-carboxylate and sec-butylamine. (Yield 90.1%)
[0106]
1H-NMR (CDClThree, Ppm)
0.96 (3H, t, J = 7.3 Hz), 1.37 (3H, d, J = 6.5 Hz), 1.47 (3H, t, J = 7.0 Hz), 1.64 to 1 .80 (2H, m), 3.58 (3H, t, J = 7.3 Hz), 3.82 to 4.04 (2H, m), 4.46 (2H, q, J = 7.0 Hz) , 5.73 (1H, s, J = 6.5 Hz), 8.67 (1H, s)
[0107]
Example 26
Compound 23 (R1: Cyclopentyl, R2: Carboxyl, RThree: Nitro) Production:
2.05 g of Compound 21 was suspended in 30 ml of tetrahydrofuran and 10 ml of methanol, and 20 ml of 0.5N sodium hydroxide aqueous solution was added dropwise under ice-cooling and left for 15 minutes. Further, 20 ml of 0.5N sodium hydroxide aqueous solution was added dropwise. The mixture was allowed to stand for 15 minutes under ice-water cooling and sonicated for 5 minutes, and concentrated sulfuric acid was added to adjust the pH to 3. 200 ml of water was added, insolubles were collected by filtration, washed with water and dried to obtain 1.21 g of Compound 23 (yield 64.2%).
[0108]
1H-NMR (DMSO-d6, Ppm)
1.50 to 2.00 (8H, m), 3.40 (2H, t, J = 8.6 Hz), 3.99 (2H, t, J = 8.6 Hz), 5.78 (1H, q , J = 8.0 Hz), 8.93 (1H, s)
[0109]
Example 27
Compound 24 (R1: Sec-butyl, R2: Carboxyl, RThree: Nitro) Production:
Compound 22 was treated in the same manner as Example 26 to give compound 24. (Yield 85.7%)
[0110]
1H-NMR (DMSO-d6, Ppm)
0.86 (3H, t, J = 7.3 Hz), 1.29 (3H, d, J = 6.5 Hz), 1.50-1.80 (2H, m), 3.42 (3H, t , J = 8.9 Hz), 3.80 to 4.04 (2H, m), 5.45 to 5.65 (1H, m), 8.93 (1H, s), 13.56 (1H, brs) )
[0111]
Example 28
Compound 25 (R1: Tert-butyl, R2: Methyl, RThree: Trifluoroacetyl):
7-Chloro-6- (2-chloroethyl) -5-methylpyrazolo [1,5-a] pyrimidine (500 mg, 2.17 mmol) was dissolved in 9 ml of dry dimethylformamide, and 191 mg (2.61 mmol) of tert-butylamine was dissolved therein. 660 mg (6.53 mmol) of triethylamine was sequentially added, and the mixture was stirred at room temperature for 172 hours. The reaction solution was poured into 50 ml of water, stirred for several minutes, and extracted with chloroform (10 ml × 4). All chloroform layers were combined, dried over sodium sulfate, and then the solvent was distilled off.
The residue was dissolved in 20 ml of ethyl acetate, washed with saturated brine (50 ml × 6), dried over sodium sulfate and evaporated. The residue was subjected to silica gel column chromatography (chloroform: n-hexane = 8: 2), and 8-tert-butyl-6,7-dihydro-5-methyl-8H-pyrrolo [3,2-e] pyrazolo [1 , 5-a] pyrimidine (0.24 g, yield 47.9%).
[0112]
IR (KBr tablet, cm-1)
1593, 1558, 1498, 1313, 1250, 1209, 749
m. p.
143.5-145.5 ° C
1H-NMR (CDClThree, Ppm)
1.73 (9H, s), 2.34 (3H, s), 2.96 (2H, t, J = 9.0 Hz), 3.95 (2H, t, J = 9.0 Hz), 6. 28 (1H, d, J = 2.7 Hz), 7.92 (1H, d, J = 2.7 Hz)
[0113]
0.24 g of this 8-tert-butyl-6,7-dihydro-5-methyl-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine is dissolved in 2.5 ml of dry methylene chloride, 0.3 ml of trifluoroacetic anhydride was added and stirred for 7 hours. The reaction solution was poured into 10 ml of chloroform and 50 ml of water, made alkaline with saturated aqueous sodium hydrogen carbonate, and the organic layer was separated. After drying with sodium sulfate, the residue was purified by silica gel column chromatography (chloroform) and recrystallized from ethanol to obtain 0.20 g of compound 25 (yield 58.5%).
[0114]
IR (KBr tablet, cm-1)
1672, 1596, 1583, 1503, 1222, 1184, 1157, 1123, 883, 730
m. p.
201.9-203.2 ° C
1H-NMR (CDClThree, Ppm)
1.72 (9H, s), 2.46 (3H, s), 3.05 (2H, t, J = 9.2 Hz), 4.07 (2H, t, J = 9.2 Hz), 8. 41 (1H, s)
[0115]
Example 29
Compound 26 (R1: Tert-amyl, R2: Methyl, RThree: Trifluoroacetyl):
8-tert-amyl-6,7-dihydro-5 prepared from 7-chloro-6- (2-chloroethyl) -5-methylpyrazolo [1,5-a] pyrimidine and tert-amylamine in the same manner as in Example 28. Compound 26 was obtained from methyl-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine. (Yield 43.0%)
[0116]
IR (KBr tablet, cm-1)
1671, 1584, 1501, 1222, 1185, 1155, 1122, 882
m. p.
147.3 to 148.8 ° C
1H-NMR (CDClThree, Ppm)
0.89 (3H, t, J = 7.8 Hz), 1.65 (6H, s), 2.29 (2H, q, J = 7.8 Hz), 2.46 (3H, s), 3. 06 (2H, t, J = 9.2 Hz), 4.08 (2H, t, J = 9.2 Hz), 8.39 (1H, s)
[0117]
Example 30
Compound 27 (R1: Cyclopentyl, R2: Methyl, RThree: Trifluoroacetyl):
8-Cyclopentyl-6,7-dihydro-5-methyl-8H prepared from 7-chloro-6- (2-chloroethyl) -5-methylpyrazolo [1,5-a] pyrimidine and cyclopentylamine as in Example 28 Compound 27 was obtained from pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine. (Yield 85.0%)
[0118]
IR (KBr tablet, cm-1)
1678, 1626, 1193, 1127, 885
m. p.
160.1-163.3 ° C
1H-NMR (CDClThree, Ppm)
1.58 to 1.88 (6H, m), 1.88 to 2.10 (2H, m), 2.46 (3H, s), 3.15 (2H, t, J = 9.2 Hz), 3.90 (2H, t, J = 9.2 Hz), 5.73-5.95 (1H, m), 8.39 (1H, s)
[0119]
Example 31
Compound 28 (R1: Cyclohexyl, R2: Methyl, RThree: Trifluoroacetyl):
8-Cyclohexyl-6,7-dihydro-5-methyl-8H prepared from 7-chloro-6- (2-chloroethyl) -5-methylpyrazolo [1,5-a] pyrimidine and cyclohexylamine as in Example 28 Compound 28 was obtained from pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine. (Yield 18.1%)
[0120]
IR (KBr tablet, cm-1)
1677, 1624, 1601, 1515, 1508, 1241, 1191, 1175, 1129
m. p.
156.0-158.2 ° C
1H-NMR (CDClThree, Ppm)
1.00-1.30 (1H, m), 1.30-2.00 (9H, m), 2.46 (3H, s), 3.14 (2H, t, J = 8.9 Hz), 3.89 (2H, t, J = 8.9 Hz), 5.22 to 5.38 (1H, m), 8.39 (1H, s)
[0121]
Example 32
Compound 29 (R1: Sec-butyl, R2: Methyl, RThree: Trifluoroacetyl):
8-sec-butyl-6,7-dihydro-5 prepared from 7-chloro-6- (2-chloroethyl) -5-methylpyrazolo [1,5-a] pyrimidine and sec-butylamine as in Example 28 Compound 29 was obtained from methyl-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine. (Yield 58.5%)
[0122]
IR (KBr tablet, cm-1)
1675, 1630, 1600, 1515, 1245, 1225, 1180, 1155, 1125, 880, 775, 725
m. p.
169.9-171.3 ° C
1H-NMR (CDClThree, Ppm)
0.94 (3H, t, J = 7.6 Hz), 1.31 (3H, d, J = 7.0 Hz), 1.55-1.80 (2H, m), 2.46 (3H, s ), 3.17 (2H, t, J = 8.9 Hz), 3.70-3.95 (2H, m), 5.50-5.68 (1H, m), 8.38 (1H, s) )
[0123]
Example 33
Preparation of ethyl 6- (2-hydroxyethyl) -5-methylpyrazolo [1,5-a] pyrimidin-7 (4H) -one-3-carboxylate:
2 ml of dry ethanol was added to 1.55 g (10.00 mmol) of ethyl 3-aminopyrazole-4-carboxylate and 1.92 g (15.00 mmol) of α-acetyl-γ-butyrolactone, and this was stirred at room temperature under a nitrogen atmosphere. While adding 0.1 ml of boron trifluoride methanol complex, the mixture was stirred for 15 minutes under the same conditions and left for 2 hours and 35 minutes. Thereafter, ethanol was added, and the insoluble solid was collected by filtration, washed with ethanol, and air-dried. The obtained solid was suspended in 10.5 ml of water, 1.03 g (10.2 mmol) of triethylamine was added thereto, and the mixture was stirred at an oil bath temperature of 100 ° C. for 3 hours. Thereafter, the mixture was cooled with ice-water, and concentrated hydrochloric acid was added with stirring to obtain a pH of around 4 (solid precipitation). Chloroform and water were added to this, and after shaking well, the chloroform layer was separated, and the aqueous layer was further extracted with chloroform. All chloroform layers were combined, dried over sodium sulfate, and then the solvent was distilled off. The residue was subjected to silica gel column chromatography (chloroform, chloroform: methanol = 100: 1) to obtain 2.11 g (yield 79.6%) of the desired product.
[0124]
IR (KBr tablet, cm-1)
3491, 3301, 1695, 1666, 1580, 1233, 1215, 1035, 778
1H-NMR (CDClThree, Ppm)
1.39 (3H, t, J = 7.3 Hz), 2.50 (3H, s), 2.88 (2H, t, J = 6.2 Hz), 3.88 (2H, t, J = 6) .2 Hz), 4.35 (2 H, q, J = 7.3 Hz), 7.27 (1 H, s), 9.53 (1 H, brs)
[0125]
Example 34
Preparation of ethyl 7-chloro-6- (2-chloroethyl) -5-methylpyrazolo [1,5-a] pyrimidine-3-carboxylate:
Ethyl 6- (2-hydroxyethyl) -5-methylpyrazolo [1,5-a] pyrimidin-7 (4H) -one-3-carboxylate 0.34 g (1.28 mmol) and 0.4 ml of phosphorus oxychloride (d = 1.645, 4.29 mmol) and 0.36 ml (d = 0.726, 2.59 mmol) of triethylamine were sequentially added, followed by stirring at an oil bath temperature of 100 ° C. for 2 hours and 15 minutes under a nitrogen atmosphere. Thereafter, the mixture was cooled with ice-water, dissolved in 10 ml of chloroform, and poured into 30 ml of water. The pH was adjusted to about 6 with saturated aqueous sodium bicarbonate, and the organic layer was separated after shaking well. The aqueous layer was further extracted with chloroform (10 ml × 2), and all chloroform layers were combined, dried over sodium sulfate, and the solvent was distilled off. The residue was subjected to silica gel chromatography (chloroform) to obtain 0.33 g (yield: 84.6%) of the desired product.
[0126]
1H-NMR (CDClThree, Ppm)
1.42 (3H, t, J = 7.3 Hz), 2.83 (3H, s), 3.38 (2H, t, J = 7.2 Hz), 3.78 (2H, t, J = 7) .2 Hz), 4.42 (2H, q, J = 7.3 Hz), 8.57 (1 H, s)
[0127]
Example 35
Preparation of ethyl 8-cyclopentyl-6,7-dihydro-5-methyl-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-3-carboxylate (compound 30):
Ethyl 7-chloro-6- (2-chloroethyl) -5-methylpyrazolo [1,5-a] pyrimidine-3-carboxylate 0.12 g (0.40 mmol) in 1.6 ml dry dimethylformamide solution was added cyclopentylamine 0. 0.04 g (0.47 mmol) and triethylamine 0.12 g (1.19 mmol) were sequentially added, and the mixture was stirred at room temperature for 17 hours 30 minutes. Thereafter, the reaction solution was poured into 50 ml of water and extracted with chloroform (10 ml × 3). All the chloroform layers were combined, dried over sodium sulfate, and the solvent was distilled off. The residue was subjected to silica gel column chromatography (chloroform) to obtain 0.10 g (yield: 80.0%) of the desired product.
[0128]
m. p.
178-180 ° C
IR (KBr tablet, cm-1)
1688, 1610, 1514, 1459, 1313, 1295, 1180, 1110, 776
1H-NMR (CDClThree, Ppm)
1.39 (3H, t, J = 7.3 Hz), 1.60 to 1.85 (6H, m), 1.85 to 2.05 (2H, m), 2.43 (3H, s), 3.11 (2H, t, J = 9.0 Hz), 3.84 (2H, t, J = 9.0 Hz), 4.37 (2H, q, J = 7.3 Hz), 5.85-6 .00 (1H, m), 8.34 (1H, s)
[0129]
Example 36
Compound 31 (R1: Tert-butyl, R2: Methyl, RThree: Ethoxycarbonyl) Production:
From 31 g of 7-chloro-6- (2-chloroethyl) -3-ethoxycarbonyl-5-methylpyrazolo [1,5-a] pyrimidine and 3.2 ml of tert-butylamine, compound 31 was prepared in the same manner as in Example 35. .57 g (57% yield) was obtained.
[0130]
IR (KBr tablet, cm-1)
1708, 1600, 1570, 1176
m. p.
164-165 ° C
1H-NMR (CDClThree, Ppm)
1.34 (3H, t, J = 7.0 Hz), 1.69 (9H, s), 2.47 (3H, s), 3.00 (2H, t, J = 8.9 Hz), 4. 00 (2H, t, J = 8.9 Hz), 4.36 (2H, q, J = 7.0 Hz), 8.35 (1H, s)
[0131]
Example 37
Compound 32 (R1: Tert-amyl, R2: Methyl, RThree: Ethoxycarbonyl) Production:
7-chloro-6- (2-chloroethyl) -3-ethoxycarbonyl-5-methylpyrazolo [1,5-a] pyrimidine (1.45 g) and tert-amylamine (5 ml) were prepared in the same manner as in Example 35 to give compound 32. Obtained .89 g (yield 58.9%).
[0132]
IR (KBr tablet, cm-1)
1705, 1600, 1507, 1174
m. p.
137-139 ° C
1H-NMR (CDClThree, Ppm)
0.86 (3H, t, J = 7.6 Hz), 1.38 (3H, t, J = 7.0 Hz), 1.63 (6H, s), 2.30 (2H, q, J = 7) .6 Hz), 2.42 (3H, s), 3.00 (2H, t, J = 8.9 Hz), 4.01 (2H, t, J = 8.9 Hz), 4.36 (2H, q) , J = 7.0 Hz), 8.33 (1H, s)
[0133]
Example 38
Compound 33 (R1: Cyclopentyl, R2: Methyl, RThree: Carboxyl):
0.90 g of compound 30 was suspended in 13 ml of ethanol, and 0.84 g of sodium hydroxide dissolved in 6.5 ml of water was added thereto, and the mixture was heated and stirred at 100 ° C. for 30 minutes in a nitrogen atmosphere. The mixture was cooled with ice water, 13 ml of water was added with stirring, 1N-hydrochloric acid was added to adjust the pH to 2, and saturated aqueous sodium hydrogen carbonate was further added to adjust the pH to 3-4. The insoluble solid was collected by filtration, washed with water and air-dried to obtain 0.75 g (yield 91.5%) of Compound 33.
[0134]
IR (KBr tablet, cm-1)
1723, 1610, 1516, 1301, 1202, 1191, 778
m. p.
230-230.5 ° C
1H-NMR (CDClThree, Ppm)
1.60 to 1.88 (6H, m), 1.88 to 2.10 (2H, m), 2.34 (3H, s), 3.14 (2H, t, J = 9.2 Hz), 3.91 (2H, t, J = 9.2 Hz), 5.78-5.95 (1H, m), 8.36 (1H, s)
[0135]
Example 39
Compound 34 (R1: Tert-butyl, R2: Methyl, RThree: Carboxyl):
In the same manner as in Example 38, 0.70 g of compound 31 was treated to obtain 0.64 g (quantitative) of compound 34.
[0136]
IR (KBr tablet, cm-1)
1718, 1584, 1508, 1203
m. p.
258-259 ° C
1H-NMR (DMSO-d6, Ppm)
1.67 (9H, s), 2.31 (3H, s), 2.99 (2H, t, J = 8.9 Hz), 4.08 (2H, t, J = 8.9 Hz), 8. 39 (1H, s)
[0137]
Example 40
Compound 35 (R1: Tert-amyl, R2: Methyl, RThree: Carboxyl):
In the same manner as in Example 38, 0.5 g of compound 32 was treated to obtain 0.41 g (yield: 89.7%) of compound 35.
[0138]
IR (KBr tablet, cm-1)
1723, 1578, 1504, 1186
m. p.
239-240 ° C
1H-NMR (DMSO-d6, Ppm)
0.89 (3H, t, J = 7.3 Hz), 1.73 (6H, s), 2.30 (2H, q, J = 7.3 Hz), 2.36 (3H, s), 3. 04 (2H, t, J = 8.9 Hz), 4.08 (2H, t, J = 8.9 Hz), 8.38 (1H, s)
[0139]
Example 41
Compound 36 (R1: Cyclopentyl, R2: Methyl, RThree: N- (1H-tetrazol-5-yl) carboxamide):
0.286 g of Compound 33 was suspended in 2 ml of dry DMF, and 0.20 g of 1,1′-carbonyldiimidazole was added as a solid while stirring at room temperature under a nitrogen atmosphere. Stir. To this reaction solution, 0.12 g of 5-amino-1H-tetrazole was added and stirred for 1 hour 30 minutes. The mixture was cooled with ice water, 10 ml of water was added, 1N-hydrochloric acid was added with stirring to adjust the pH to 1, and then saturated aqueous sodium hydrogen carbonate was added to adjust the pH to 4. The insoluble solid was collected by filtration, washed with water and air-dried to obtain 0.315 g (yield 89.2%) of Compound 36.
[0140]
IR (KBr tablet, cm-1)
1676, 1605, 1543, 1508, 1297, 1200, 1186, 764
m. p.
293-296 ° C
1H-NMR (CDClThree, Ppm)
1.68 to 1.88 (6H, m), 1.90 to 2.08 (2H, m), 2.45 (3H, s), 3.17 (3H, t, J = 9.2 Hz), 3.93 (3H, t, J = 9.2 Hz), 5.80-5.95 (1H, m), 8.52 (1H, s)
[0141]
Reference Example 5
Production of 1-bromo-2-t-butyldimethylsilyloxyethane:
To 40 ml of molecular sieves-dried acetonitrile, 3.50 g of t-butyldimethylsilyl chloride and 4.00 g of imidazole were added, followed by stirring at room temperature for 10 minutes. To this was added 2.64 g of 2-bromoethanol, and the mixture was further stirred at room temperature for 6 hours. The solvent was distilled off under reduced pressure, and ethyl acetate was added to the residue. The ethyl acetate layer was washed with a saturated aqueous sodium hydrogen carbonate solution and dried over anhydrous sodium carbonate, and then the solvent was distilled off under reduced pressure. The resulting crude product was subjected to silica gel column chromatography (elution solvent hexane: ethyl acetate = 2: 1) to obtain 4.40 g (yield: 87.0%) of the desired product.
[0142]
Colorless liquid
1H-NMR (CDClThree, Ppm)
-0.10 (6H, s), 0.82 (9H, s), 3.31 (2H, t, J = 6.3 Hz), 3.80 (2H, t, J = 6.3 Hz)
[0143]
Reference Example 6
Preparation of diethyl 2- (2-t-butyldimethylsilyloxyethyl) malonate:
In 90.70 L of molecular sieves-dried ethanol, 22.90 g of metallic sodium was dissolved, 131.0 g of diethyl malonate and 230 g of the compound of Reference Example 5 were added, and the mixture was stirred overnight with heating under reflux. The solvent was distilled off under reduced pressure, ether was added a little, and the precipitated crystals were filtered off, the filtrate was concentrated, and subjected to silica gel column chromatography (elution solvent hexane only → hexane: ethyl acetate = 10: 1) to give the desired product. 234.42 g (yield 89.9%) was obtained.
[0144]
Colorless liquid
1H-NMR (CDClThree, Ppm)
0.02 (6H, s), 0.87 (9H, s), 1.25 (6H, t, J = 7.2 Hz), 2.10 (2H, q, J = 6.5 Hz), 3. 54-3.66 (3H, m), 4.17 (4H, m)
[0145]
Reference Example 7
Preparation of 5-hydroxy-6- (2-hydroxyethyl) pyrazolo [1,5-a] pyrimidin-7 (4H) -one:
After dissolving 6.72 g of metallic sodium in 1200 ml of molecular sieves-dried ethanol, 64.0 g of the compound of Reference Example 6 and 12.12 g of 3-aminopyrazole were added, and the mixture was stirred for 3 days with heating under reflux. The solvent was distilled off under reduced pressure, and water was added to the residue to dissolve it. The aqueous layer was washed 3 times with ether. The aqueous layer was cooled to 0 ° C., adjusted to pH = 5.0 with 1N hydrochloric acid, and the precipitated crystals were collected by filtration. To this crystal, 200 ml of methanol and 3 drops of concentrated hydrochloric acid were added, the solvent was distilled off under reduced pressure together with water, and the crystal was precipitated from a methanol / ether system to obtain 21.38 g (yield 76.8%) of the desired product.
[0146]
Light brown crystals
1H-NMR (DMSO-d6, Ppm)
2.66 (2H, t, J = 6.7 Hz), 3.52 (2H, t, J = 6.7 Hz), 5.93 (1H, d, J = 1.9 Hz), 7.60 (1H , D, J = 1.9 Hz)
[0147]
Reference Example 8
Preparation of 6- (2-chloroethyl) -5,7-dichloropyrazolo [1,5-a] pyrimidine:
To 12.45 g of 5-hydroxy-6- (2-hydroxyethyl) pyrazolo [1,5-a] pyrimidin-7 (4H) -one, 100 ml of phosphorus oxychloride and 13.00 g of triethylamine were added, and heated under reflux for 2 hours. Stirring was performed. After excess phosphorus oxychloride was distilled off under reduced pressure, the residue was poured into ice-water and extracted with chloroform. The chloroform layer was washed with water, dried over sodium sulfate, and the solvent was distilled off under reduced pressure. The residue was subjected to silica gel column chromatography (chloroform) to obtain 10.86 g (yield 68.0%) of the desired product.
[0148]
Light brown crystals
1H-NMR (CDClThree, Ppm)
3.49 (2H, t, J = 7.0 Hz), 3.82 (2H, t, J = 7.0 Hz), 6.80 (1H, d, J = 2.4 Hz), 8.21 (1H , D, J = 2.4 Hz)
[0149]
Example 42
Preparation of 6- (2-chloroethyl) -5,7-dichloro-3-nitropyrazolo [1,5-a] pyrimidine:
100 ml of concentrated sulfuric acid was cooled to 0 ° C. under ice cooling, and 50 ml of 90% nitric acid was gradually added thereto so that the temperature did not rise. After stirring for a while, 13.80 g of the compound of Reference Example 8 was gradually added in the form of crystals so that the temperature did not rise, and the mixture was stirred at 0 ° C. for 4 hours. Since the raw material spot disappeared on TLC, the stirring was stopped and the reaction solution was poured into ice water. The precipitated crystals were collected by filtration and air-dried. Yield 15.61 g. Yield 95.5%.
[0150]
Yellow crystals
1H-NMR (CDClThree, Ppm)
3.55 (2H, t, J = 7.0 Hz), 3.89 (2H, t, J = 7.0 Hz), 8.84 (1H, s)
[0151]
Example 43
Preparation of 8-t-butyl-5-chloro-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 40):
6.00 g of the compound of Example 42 was dissolved in 50 ml of dry dimethylformamide, 1.80 g of t-butylamine and 4.10 g of triethylamine were added, and the mixture was stirred at room temperature for 4 hours. The reaction mixture was concentrated under reduced pressure, the residue was dissolved in chloroform, washed with dilute hydrochloric acid and saturated brine, dried over sodium sulfate, and the solvent was evaporated. From the residue, crystals were precipitated from the chloroform-ether system to obtain the desired product. Yield 5.54g. Yield 92.3%.
[0152]
Yellow crystals
m. p.
247 ° C (decomposition)
IR (KBr tablet, cm-1)
1610, 1580, 1480
1H-NMR (CDClThree, Ppm)
1.78 (9H, s), 3.13 (2H, t, J = 8.9 Hz), 4.15 (2H, t, J = 8.9 Hz), 8.61 (1H, s)
[0153]
Example 44
Preparation of 5-chloro-8-cyclopentyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 41):
Synthesis was performed according to the synthesis method of Example 43 by allowing 6.09 g of the compound of Example 42 to act on 5.59 g of cyclopentylamine and 4.10 g of triethylamine. Yield 5.59g. Yield 89.2%.
[0154]
Yellow crystals
m. p.
209-210 ° C
IR (KBr tablet, cm-1)
1610, 1480, 1230
1H-NMR (CDClThree, Ppm)
1.76 (6H, m), 2.04 (2H, m), 3.26 (2H, t, J = 7.8 Hz), 3.86 (2H, t, J = 7.8 Hz), 5. 79 (1H, m), 8.57 (1H, s)
[0155]
Example 45
Preparation of 8-sec-butyl-5-chloro-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 42):
Synthesis was performed according to the synthesis method of Example 43 by allowing 1.80 g of sec-butylamine and 4.10 g of triethylamine to act on 6.00 g of the compound of Example 42. Yield 5.50 g. Yield 91.7%.
[0156]
Yellow crystals
m. p.
270 ° C or higher
IR (KBr tablet, cm-1)
1630, 1610, 1490, 1230, 1220
1H-NMR (CDClThree, Ppm)
0.95 (3H, t, J = 7.0 Hz), 1.34 (3H, d, J = 7.0 Hz), 1.68 (2H, m), 3.24 (2H, t, J = 8) .9Hz), 3.89 (1H, m), 5.58 (1H, m), 8.58 (1H, s)
[0157]
Reference Example 9
Preparation of 8-tert-butyl-5-chloro-6,7-dihydro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine:
Dissolve 12.50 g of 6- (2-chloroethyl) -5,7-dichloropyrazolo [1,5-a] pyrimidine in 70 ml of dimethylformamide, add 9.55 g of tert-butylamine and 11.47 g of triethylamine, and bring to room temperature. For 2 days. Excess amine and solvent were distilled off under reduced pressure, and the residue was dissolved in chloroform. The chloroform layer was washed with saturated brine and then dried over anhydrous sodium sulfate, the solvent was distilled off under reduced pressure, and crystals were precipitated from the chloroform / ether system. The crystals were collected by filtration and recrystallized from ethanol to obtain 11.34 g (yield 90.6%) of the desired product.
[0158]
White crystals
1H-NMR (CDClThree, Ppm)
1.79 (9H, s), 3.06 (2H, t, J = 7.2 Hz), 4.00 (2H, t, J = 7.2 Hz), 6.31 (1H, d, J = 2) .4 Hz), 7.95 (1H, d, J = 2.4 Hz)
[0159]
Reference Example 10
Preparation of 5-chloro-8-cyclopentyl-6,7-dihydro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine:
According to the synthesis method of Reference Example 9, 4.54 g of cyclopentylamine and 8.87 g of triethylamine were reacted with 11.0 g of 6- (2-chloroethyl) -5,7-dichloropyrazolo [1,5-a] pyrimidine. Synthesis was performed. Yield 10.42 g. Yield 90.4%.
[0160]
White crystals
1H-NMR (CDClThree, Ppm)
1.70 (6H, m), 2.10 (2H, m), 3.15 (2H, t, J = 6.2 Hz), 3.85 (2H, t, J = 6.2 Hz), 6. 04 (1H, m), 6.30 (1H, d, J = 2.4 Hz), 7.95 (1H, d, J = 2.4 Hz)
[0161]
Reference Example 11
Preparation of 8-sec-butyl-5-chloro-6,7-dihydro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine:
According to the synthesis method of Reference Example 9, 4.00 g of sec-butylamine and 4.82 g of triethylamine were allowed to act on 5.26 g of 6- (2-chloroethyl) -5,7-dichloropyrazolo [1,5-a] pyrimidine. Were synthesized. Yield 4.68g. Yield 89.0%.
[0162]
White crystals
1H-NMR (CDClThree, Ppm)
0.97 (3H, t, J = 7.3 Hz), 1.29 (3H, d, J = 7.0 Hz), 1.69 (2H, m), 3.20 (2H, t, J = 6) .2 Hz), 3.80 (2 H, m), 5.73 (1 H, m), 6.30 (1 H, d, J = 1.9 Hz), 7.94 (1 H, d, J = 1.9 Hz) )
[0163]
Reference Example 12
Preparation of 8-tert-butyl-6,7-dihydro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine:
Dissolve 11.30 g of 8-tert-butyl-5-chloro-6,7-dihydro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine in a mixed solvent of 300 ml of tetrahydrofuran and 150 ml of methanol. The reaction system was cooled to 0 ° C. To this, 3.75 g of palladium chloride and 7.83 g of sodium borohydride were gradually added and stirred at 0 ° C. for 30 minutes. Further, 7.50 g of palladium chloride and 5.66 g of sodium borohydride were gradually added, followed by stirring at 0 ° C. for 30 minutes and at room temperature for 2 hours. The reaction solvent was distilled off under reduced pressure, and the crude product was subjected to silica gel column chromatography (ethyl acetate → ethyl acetate: methanol = 10: 1) to obtain 3.94 g (yield 40.4%) of the desired product.
[0164]
White crystals
1H-NMR (CDClThree, Ppm)
1.74 (9H, s), 3.04 (2H, t, J = 8.9 Hz), 3.96 (2H, t, J = 8.9 Hz), 6.37 (1H, d, J = 2) .2 Hz), 7.94 (1 H, s), 7.96 (1 H, d, J = 2.2 Hz)
[0165]
Reference Example 13
Preparation of 8-cyclopentyl-6,7-dihydro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine:
The target product was prepared in the same manner as in Reference Example 12 using 10.42 g of 5-chloro-8-cyclopentyl-6,7-dihydro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine. 3.44 g (yield 38.0%) was obtained.
[0166]
White crystals
1H-NMR (CDClThree, Ppm)
1.75 (6H, m), 1.98 (2H, m), 3.16 (2H, t, J = 8.9 Hz), 3.85 (2H, t, J = 8.9 Hz), 6. 05 (1H, m), 6.31 (1H, d, J = 2.4 Hz), 7.98 (1H, s), 7.98 (1H, d, J = 2.4 Hz)
[0167]
Reference Example 14
Preparation of 8-sec-butyl-6,7-dihydro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine:
The objective was obtained in the same manner as in Reference Example 12 using 4.68 g of 8-sec-butyl-5-chloro-6,7-dihydro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine. 1.23 g (yield 30.4%) of the product was obtained.
[0168]
White crystals
1H-NMR (CDClThree, Ppm)
0.94 (3H, t, J = 7.6 Hz), 1.27 (3H, d, J = 6.5 Hz), 1.63 (2H, m), 3.17 (2H, t, J = 8) .9 Hz), 3.75 (2H, m), 5.73 (1 H, m), 6.37 (1 H, d, J = 2.4 Hz), 7.96 (1 H, s), 7.96 ( 1H, d, J = 2.4Hz)
[0169]
Example 46
Preparation of 8-tert-butyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 37):
After gradually adding 3.30 ml of 90% nitric acid to 25 ml of acetic acid, 3 drops of concentrated sulfuric acid was added, and the mixture was stirred at room temperature for a while. To this, 8.0 ml of acetic acid in an amount of 3.90 g of 8-tert-butyl-6,7-dihydro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine was gradually added. Since the raw material spot disappeared on TLC, stirring was stopped, the reaction solution was poured into ice water, and chloroform extraction was performed. The chloroform layer was washed with saturated brine, dried over anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. Crystals were precipitated from the chloroform / ether system. The crystals collected by filtration were recrystallized from ethanol and purified to obtain 2.32 g (yield 49.0%) of the desired product.
[0170]
Yellow crystals
m. p.
209 ° C
IR (KBr tablet, cm-1)
1620, 1590, 1490, 1400
1H-NMR (CDClThree, Ppm)
1.73 (9H, s), 3.16 (2H, t, J = 8.9 Hz), 4.12 (2H, t, J = 8.9 Hz), 8.17 (1H, s), 8. 61 (1H, s)
[0171]
Example 47
Preparation of 8-cyclopentyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 38):
Using 2.54 g of the desired product in the same manner as in Example 46, using 3.40 g of 8-cyclopentyl-6,7-dihydro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine ( Yield 56.0%).
[0172]
Yellow crystals
m. p.
181 ° C
IR (KBr tablet, cm-1)
1620, 1610, 1480, 1245, 1220
1H-NMR (CDClThree, Ppm)
1.75 (6H, m), 2.05 (2H, m), 3.29 (2H, t, J = 8.4 Hz), 4.06 (2H, t, J = 8.4 Hz), 5. 83 (1H, m), 8.14 (1H, s), 8.60 (1H, s)
[0173]
Example 48
Preparation of 8-sec-butyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 39):
Using 240 mg of 8-sec-butyl-6,7-dihydro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine in the same manner as in Example 46, 190 mg (yield) 65.5%).
[0174]
Yellow crystals
m. p.
199 ° C
IR (KBr tablet, cm-1)
1630, 1610, 1480, 1250, 1220
1H-NMR (CDClThree, Ppm)
0.95 (3H, t, J = 7.3 Hz), 1.33 (3H, d, J = 6.8 Hz), 1.73 (2H, m), 3.27 (2H, t, J = 9) .2 Hz), 3.87 (2H, m), 5.62 (1 H, m), 8.18 (1 H, s), 8.62 (1 H, s)
[0175]
Example 49
Preparation of 8-sec-butyl-6,7-dihydro-5-hydroxymethyl-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 53):
330 mg of compound 24 was suspended in 10 ml of dry tetrahydrofuran, the reaction system was cooled with ice-salt, and 0.17 ml of triethylamine was added with stirring under a nitrogen atmosphere. Further, 0.12 ml of ethyl chlorocarbonate in 2 ml of dry tetrahydrofuran was added dropwise over 1 minute and stirred for 40 minutes. Next, 100 mg of sodium borohydride was added to the reaction system at a time, and the mixture was stirred at room temperature for 1 hour. Further, 50 mg of sodium borohydride was added, and stirred for 1 hour under ice cooling. 1N hydrochloric acid was added little by little at the same temperature to adjust to pH = 1-2. Saturated aqueous sodium hydrogen carbonate solution was added thereto to make it weakly alkaline, and 10 ml of water was added, followed by extraction with ethyl acetate. The organic layer was washed with saturated brine, dried over anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The aqueous layer was extracted again with chloroform and dried over anhydrous sodium sulfate, and then the solvent was distilled off under reduced pressure. The crude products obtained from both organic layers were combined and subjected to silica gel column chromatography (elution solvent chloroform: methanol = 100: 0.5) to obtain 40 mg of the desired product. (Yield 12.7%)
[0176]
Yellow crystals
IR (KBr tablet, cm-1)
3421, 1623, 1489, 1241
m. p.
222-226 ° C
1H-NMR (CDClThree, Ppm)
0.94 (3H, t, J = 7.3 Hz), 1.33 (3H, d, J = 6.5 Hz), 1.65 (2H, m), 3.19 (2H, t, J = 8) 0.9 Hz), 3.87 (2H, m), 4.65 (2H, s), 5.60 (1H, m), 8.56 (1H, s)
[0177]
Example 50
Preparation of 8-sec-butyl-5-carbamoyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 75):
0.19 g of compound 24 was suspended in 6 ml of dry tetrahydrofuran, the reaction system was cooled with ice-salt, and 0.11 ml of triethylamine was added with stirring under a nitrogen atmosphere. Further, 0.02 ml of ethyl chlorocarbonate in 2 ml of dry tetrahydrofuran was added dropwise over 2 minutes and stirred for 40 minutes under the same conditions. Subsequently, 1.8 ml of concentrated aqueous ammonia was added all at once under the same conditions, and the mixture was vigorously stirred at room temperature for 1 hour. The precipitated crystals were collected by filtration and air-dried. The obtained crystals were once dissolved in chloroform: methanol = 4: 1, insolubles were filtered off, concentrated under reduced pressure, and hexane was added for reprecipitation. Yield 150 mg (yield 78.9%).
[0178]
Yellow-green crystal
IR (KBr tablet, cm-1)
3432, 1697, 1490, 1236
m. p.
300 ℃ or higher
1H-NMR (DMSO-d6, Ppm)
0.93 (3H, t, J = 7.3 Hz), 1.34 (3H, d, J = 6.5 Hz), 1.73 (2H, m), 3.53 (2H, t, J = 8) .6 Hz), 4.00 (2H, m), 5.60 (1H, m), 7.83 (1H, br), 7.93 (1H, br), 8.99 (1H, s)
[0179]
Example 51
Preparation of ethyl 8-cyclopropyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylate (compound 76):
The target product was obtained in the same manner as in Example 23 from ethyl 7-chloro-6- (2-chloroethyl) -3-nitro-pyrazolo [1,5-a] pyrimidine-5-carboxylate and cyclopropylamine. (Yield 97.6%)
[0180]
1H-NMR (CDClThree, Ppm)
1.00 to 1.09 (4H, m), 1.42 (3H, t, J = 7.0 Hz), 3.50 (2H, t, J = 8.9 Hz), 3.70 (1H, m ), 3.95 (2H, t, J = 8.9 Hz), 4.42 (2H, q, J = 7.0 Hz), 8.72 (1H, s)
[0181]
Example 52
Preparation of ethyl 8-cyclobutyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylate (Compound 77):
The target product was obtained in the same manner as in Example 23 from ethyl 7-chloro-6- (2-chloroethyl) -3-nitro-pyrazolo [1,5-a] pyrimidine-5-carboxylate and cyclobutylamine. (Yield 99.8%)
[0182]
1H-NMR (CDClThree, Ppm)
1.46 (3H, t, J = 6.8 Hz), 1.84 (2H, m), 2.38 (4H, m), 3.59 (2H, t, J = 8.6 Hz), 4. 13 (2H, t, J = 8.6 Hz), 4.45 (2H, q, J = 6.8 Hz), 6.05 (1H, m), 8.67 (1H, s)
[0183]
Example 53
Preparation of ethyl 6,7-dihydro-8-isopropyl-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylate (Compound 78):
The target product was obtained in the same manner as in Example 23 from ethyl 7-chloro-6- (2-chloroethyl) -3-nitro-pyrazolo [1,5-a] pyrimidine-5-carboxylate and isopropylamine. (Yield 97.1%)
[0184]
1H-NMR (CDClThree, Ppm)
1.40 (6H, d, J = 7.0 Hz), 1.47 (3H, t, J = 7.0 Hz), 3.56 (2H, t, J = 8.9 Hz), 3.99 (2H , T, J = 8.9 Hz), 4.45 (2H, q, J = 7.0 Hz), 5.89 (1H, m), 8.65 (1H, s)
[0185]
Example 54
Preparation of ethyl 6,7-dihydro-8- (1-ethylpropyl) -3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylate (Compound 79) :
The target product was obtained in the same manner as in Example 23 from ethyl 7-chloro-6- (2-chloroethyl) -3-nitro-pyrazolo [1,5-a] pyrimidine-5-carboxylate and 3-aminopentane. (Yield 96.4%)
[0186]
1H-NMR (CDClThree, Ppm)
0.93 (6H, t, J = 7.3 Hz), 1.47 (3H, t, J = 7.3 Hz), 1.65 to 1.82 (4H, m), 3.61 (2H, t , J = 8.6 Hz), 3.87 (2H, t, J = 8.6 Hz), 4.46 (2H, q, J = 7.3 Hz), 5.61 (1H, m), 8.67. (1H, s)
[0187]
Example 55
Preparation of 8-cyclopropyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylic acid (compound 80):
Treatment of ethyl 8-cyclopropyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylate as in Example 26. The target was obtained. (Yield: quantitative)
[0188]
1H-NMR (DMSO-d6, Ppm)
0.86 to 1.07 (4H, m), 3.33 (2H, t, J = 8.9 Hz), 3.68 (1H, m), 3.88 (2H, t, J = 8.9 Hz) ), 8.91 (1H, s)
[0189]
Example 56
Preparation of 8-cyclobutyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylic acid (Compound 81):
Treating ethyl 8-cyclobutyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylate as in Example 26, The desired product was obtained. (Yield: 94.1%)
[0190]
1H-NMR (DMSO-d6, Ppm)
1.78 to 1.86 (2H, m), 2.30 to 2.46 (4H, m), 3.59 (2H, t, J = 8.4 Hz), 4.15 (2H, t, J = 8.4 Hz), 4.23 (1H, br), 6.04 (1H, m), 8.68 (1H, s)
[0191]
Example 57
Preparation of 6,7-dihydro-8-isopropyl-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylic acid (Compound 82):
Treating ethyl 6,7-dihydro-8-isopropyl-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylate as in Example 26, The desired product was obtained. (Yield: 97.0%)
[0192]
1H-NMR (DMSO-d6, Ppm)
1.39 (6H, d, J = 7.0 Hz), 3.55 (2H, t, J = 8.6 Hz), 4.01 (2H, t, J = 8.6 Hz), 5.86 (1H , M), 8.69 (1H, s)
[0193]
Example 58
Preparation of 6,7-dihydro-8- (1-ethylpropyl) -3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylic acid (Compound 83):
Ethyl 6,7-dihydro-8- (1-ethylpropyl) -3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylate as in Example 26 To obtain the desired product. (Yield: 97.3%)
[0194]
1H-NMR (DMSO-d6, Ppm)
0.93 (6H, t, J = 7.3 Hz), 1.59 to 1.86 (4H, m), 3.67 (2H, t, J = 8.9 Hz), 3.93 (2H, t , J = 8.9 Hz), 5.63 (1H, m), 8.68 (1H, s)
[0195]
Example 59
Preparation of 5-amino-8-cyclopropyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (compound 84): 8-cyclopropyl- 6,7-Dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylic acid is used as a starting material to produce the target product in the same manner as in Example 20. (Yield: 74.4%). The obtained target product was reprecipitated from chloroform-methanol-ether.
[0196]
Yellow crystals
IR (KBr tablet, cm-1)
1636, 1400, 1260
m. p.
280 ° C or higher
1H-NMR (DMSO-d6, Ppm)
0.84 (4H, m), 2.80 (2H, t, J = 8.9 Hz), 3.18 (1H, m), 3.72 (2H, t, J = 8.9 Hz), 7. 04 (2H, br), 8.51 (1H, s)
[0197]
Example 60
Preparation of 5-amino-8-cyclobutyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 85):
8-cyclobutyl-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylic acid was used as a starting material in the same manner as in Example 20. The desired product was produced (yield: 54.1%). The obtained target product was reprecipitated from chloroform-methanol-ether.
[0198]
Yellow crystals
IR (KBr tablet, cm-1)
1640, 1400, 1240
m. p.
275 ° C or higher
1H-NMR (DMSO-d6, Ppm)
1.70 (2H, m), 2.16 (2H, m), 2.33 (2H, m), 2.96 (2H, t, J = 9.2 Hz), 3.93 (2H, t, J = 9.2 Hz), 5.75 (1H, m), 6.62 (2H, br), 8.37 (1H, s)
[0199]
Example 61
Preparation of 5-amino-6,7-dihydro-8-isopropyl-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 86):
In the same manner as in Example 20, using 6,7-dihydro-8-isopropyl-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylic acid as a raw material. The desired product was produced (yield: 48.9%). The obtained target product was reprecipitated from chloroform-methanol-ether.
[0200]
Yellow crystals
IR (KBr tablet, cm-1)
1635, 1400, 1260
m. p.
275 ° C or higher
1H-NMR (DMSO-d6, Ppm)
1.27 (6H, d, J = 6.2 Hz), 2.97 (2H, t, J = 9.5 Hz), 3.81 (2H, t, J = 9.5 Hz), 5.54 (1H M), 6.03 (2H, br), 8.37 (1H, s)
[0201]
Example 62
Preparation of 5-amino-6,7-dihydro-8- (1-ethylpropyl) -3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 87):
Example 6, starting from 6,7-dihydro-8- (1-ethylpropyl) -3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine-5-carboxylic acid The target product was produced in the same manner as in (Yield: 48.5%). The obtained target product was reprecipitated from chloroform-methanol-ether.
[0202]
Yellow crystals
IR (KBr tablet, cm-1)
1650, 1400, 1253
m. p.
106-109 ° C
1H-NMR (CDClThree, Ppm)
0.90 (6H, t, J = 7.3 Hz), 1.54 to 1.67 (4H, m), 3.00 (2H, t, J = 8.9 Hz), 3.75 (2H, t , J = 8.9 Hz), 5.35 (1H, m), 5.78 (2H, br), 8.41 (1H, s)
[0203]
Example 63
Preparation of 8-sec-butyl-5-diethylamino-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 57):
8-sec-butyl-5-chloro-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 42) 1.00 g of diethylamine in 400 mg, Triethylamine 1.00g and dimethylformamide 6.0ml were added, and it stirred under heating-refluxing for 3 hours. Since the material spots almost disappeared on TLC, the stirring was stopped, a part of the solvent was distilled off under reduced pressure, the reaction solution was poured into ice water, and the precipitated crystals were collected by filtration and air-dried. Further, the crystals obtained here were recrystallized from ethanol. Yield 410 mg (yield 91.1%).
[0204]
Yellow crystals
IR (KBr tablet, cm-1)
1630, 1540, 1400, 1252
m. p.
174-175 ° C
1H-NMR (CDClThree, Ppm)
0.92 (3H, t, J = 7.3 Hz), 1.20 to 1.30 (8H, m), 1.52-1.68 (2H, m), 3.26 (2H, t, J = 9.2 Hz), 3.62 to 3.73 (6H, m), 5.43 to 5.56 (1H, m), 8.41 (1H, s)
[0205]
Example 64
Preparation of 8-sec-butyl-5-cyclobutylamino-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 59):
8-sec-butyl-5-chloro-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (compound 42) 200 mg of dimethylformamide 6.0 ml Into this, 800 mg of cyclobutylamine and 800 mg of triethylamine were added, and the mixture was stirred at 130 ° C. for 4 hours. Since the raw material spots disappeared on TLC, the stirring was stopped, the reaction solution was poured into ice water, and the precipitated crystals were collected by filtration and air-dried. Yield 120 mg (51.3% yield). The purification was further performed by silica gel column chromatography (elution solvent hexane: ethyl acetate = 1: 1), and further crystals were precipitated from a chloroform / ether system.
[0206]
Yellow crystals
IR (KBr tablet, cm-1)
3395, 1635, 1600, 1380, 1250
m. p.
249-251 ° C
1H-NMR (CDClThree, Ppm)
0.91 (3H, t, J = 7.3 Hz), 1.22 (3H, d, J = 6.5 Hz), 1.59 (2H, m), 1.77 (2H, m), 1. 92 (2H, m), 2.48 (2H, m), 2.96 (2H, t, J = 8.9 Hz), 3.73 (2H, m), 4.73 (2H, m), 5 .39 (1H, m), 8.39 (1H, s)
[0207]
Example 65
Preparation of 8-sec-butyl-6,7-dihydro-3-nitro-5-pyrrolidino-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 60):
8-sec-butyl-5-chloro-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 42) 400 mg to 1.00 g pyrrolidine, Triethylamine 1.00g and dimethylformamide 6.0ml were added, and it stirred under heating-refluxing for 2 hours. Since the raw material spots almost disappeared on TLC, the stirring was stopped, the solvent and excess amine were distilled off under reduced pressure, chloroform / ether was added to the residue, and the precipitated crystals were collected by filtration and dried. Further, the crystals obtained here were recrystallized from ethanol. Yield 390 mg (yield 87.4%).
[0208]
Yellow crystals
IR (KBr tablet, cm-1)
1633, 1540, 1394, 1256
m. p.
237 ° C
1H-NMR (CDClThree, Ppm)
0.94 (3H, t, J = 7.0 Hz), 1.24 (3H, d, J = 6.7 Hz), 1.52-1.68 (2H, m), 1.96 (4H, m ), 3.36 (2H, t, J = 8.9 Hz), 3.56 to 3.69 (2H, m), 3.78 (4H, m), 5.45 (1H, m), 8. 37 (1H, s)
[0209]
Example 66
Preparation of 8-sec-butyl-6,7-dihydro-3-nitro-5-piperidino-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 61):
8-sec-butyl-5-chloro-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 42) 10 mg of piperidine was added to 200 mg, The mixture was stirred for 1 hour with heating under reflux. Excess piperidine was distilled off under reduced pressure, the residue was dissolved in chloroform, the organic layer was washed with 1N hydrochloric acid and saturated brine, dried over anhydrous sodium sulfate, and the solvent was distilled off under reduced pressure. Crystals were precipitated from the chloroform / ether system, and the crystals were collected by filtration and dried. The obtained crystals were further recrystallized from ethanol. Yield 140 mg (60.9% yield).
[0210]
Yellow crystals
IR (KBr tablet, cm-1)
1638, 1398, 1230
m. p.
182 ° C
1H-NMR (CDClThree, Ppm)
0.92 (3H, t, J = 7.2 Hz), 1.21 (3H, d, J = 6.5 Hz), 1.61-1.80 (8H, m), 3.24 (2H, t , J = 9.5 Hz), 3.75 (6H, m), 5.51 (1H, m), 8.39 (1H, s)
[0211]
Example 67
Preparation of 8-sec-butyl-6,7-dihydro-5-morpholino-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 62):
8-sec-butyl-5-chloro-6,7-dihydro-3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine (Compound 42) 4.0 mg of morpholine in 400 mg In addition, the mixture was stirred overnight with heating under reflux. Since there was not much change on TLC, 4 ml of dimethylformamide and 1 ml of triethylamine were added, and the mixture was further stirred overnight with heating under reflux. Since the raw material spots almost disappeared on TLC, the stirring was stopped, the solvent and excess amine were distilled off under reduced pressure, the residue was dissolved in chloroform, the organic layer was washed with 1N hydrochloric acid and saturated brine, and then anhydrous sodium sulfate. It dried and the solvent was depressurizingly distilled. Chloroform and ether were added to the residue, the precipitated crystals were collected by filtration, and the crystals were recrystallized from ethanol. Yield 260 mg (56.5% yield).
[0212]
Yellow crystals
IR (KBr tablet, cm-1)
1642, 1400, 1250
m. p.
262 ° C
1H-NMR (CDClThree, Ppm)
0.92 (3H, t, J = 7.6 Hz), 1.23 (3H, d, J = 7.0 Hz), 1.55 to 1.64 (2H, m), 3.26 (2H, t , J = 9.2 Hz), 3.67 to 3.80 (10H, m), 5.43 (1H, m), 8.41 (1H, s)
[0213]
Reference Example 15
Production of ethyl benzyloxyacetate:
Sodium hydride (4.42 g) was washed twice with dry ether, 80 ml of toluene was added, and under a nitrogen atmosphere, a solution of benzyl alcohol (10.81 ml) in toluene (20 ml) was added dropwise over 25 minutes under ice-cooling, and at room temperature for 3 hours. Stir for 30 minutes. Next, the reaction system was ice-cooled, and a solution of 16.76 g of ethyl bromoacetate in 20 ml of toluene was added dropwise over 30 minutes. The mixture was further stirred at 0 ° C. for 25 minutes, poured into a mixture of 400 ml of cold water and 2 ml of 5N hydrochloric acid, and extracted with benzene. The organic layer was washed with saturated brine, dried over anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The obtained crude product was subjected to silica gel column chromatography (elution solvent hexane: ethyl acetate = 15: 1 → 12: 1 → 10: 1) to obtain 14.75 g of a colorless oily target product. Yield 76.0%.
[0214]
1H-NMR (CDClThree, Ppm)
1.30 (3H, t, J = 7.0 Hz), 4.09 (2H, s), 4.22 (2H, q, J = 7.0 Hz), 4.64 (2H, s), 7. 30 to 7.42 (5H, m)
[0215]
Reference Example 16
Production of 2-benzyloxyacetyl-γ-butyrolactone:
A solution of 10.6 ml of diisopropylamine in 75 ml of tetrahydrofuran was cooled to -70 ° C, and 46 ml of 1.6 N n-butyllithium-hexane solution was added dropwise. After completion of the dropwise addition, the mixture was stirred for 15 minutes, and a solution of 54.8 g of γ-butyrolactone in 50 ml of tetrahydrofuran was added dropwise over 55 minutes and stirred for 50 minutes. Further, a solution of ethyl benzyloxyacetate (14.75 g) in tetrahydrofuran (50 ml) was added, and the mixture was stirred at −60 to −50 ° C. for 2 hours and 30 minutes. Subsequently, 5N hydrochloric acid was added so as not to exceed 20 ° C., and the pH was adjusted to 1-2. Ethyl acetate was added to the reaction system, and this was washed with saturated brine. The organic layer was dried over anhydrous sodium sulfate, the solvent was distilled off under reduced pressure, and the crude product was subjected to silica gel column chromatography (elution solvent hexane: ethyl acetate = 3: 1 → 2: 1 → 1: 1) to give a colorless oil 13.01 g of the desired product was obtained. Yield 87.2%.
[0216]
1H-NMR (CDClThree, Ppm)
2.30 (1H, m), 2.75 (1H, m), 3.88 (1H, m), 4.27 to 4.47 (4H, m), 4.68 (2H, s), 7 .29-7.38 (5H, m)
[0217]
Reference Example 17
Preparation of 3-{[2- (benzyloxy) -1- (tetrahydro-2-oxo-3-furyl) ethylidene] amino} pyrazole:
2-Benzyloxyacetyl-γ-butyrolactone (1.83 g) and 3-aminopyrazole (0.50 g) were dissolved in ethanol (2.0 ml), boron trifluoride methanol complex (60 μl) was added, and the mixture was stirred at room temperature for 16 hours and 30 minutes. . The solvent was distilled off under reduced pressure, and the residue was subjected to silica gel column chromatography (elution solvent hexane: ethyl acetate = 1: 1 → 1: 2) to obtain 1.18 g of the objective yellow oil. Yield 65.5%.
[0218]
1H-NMR (CDClThree, Ppm)
2.93 (2H, t, J = 7.8 Hz), 4.33 (2H, t, J = 7.8 Hz), 4.42 (2H, s), 4.52 (2H, s), 6. 06 (1H, d, J = 2.4 Hz), 7.29-7.37 (5H, m), 7.44 (1H, d, J = 2.4 Hz), 9.96 (1H, br)
[0219]
Reference Example 18
Preparation of 5- (benzyloxymethyl) -6- (2-hydroxyethyl) pyrazolo [1,5-a] pyrimidin-7 (4H) -one:
To 1.18 g of 3-{[2- (benzyloxy) -1- (tetrahydro-2-oxo-3-furyl) ethylidene] amino} pyrazole were added 600 μl of triethylamine and 2.0 ml of water, and the mixture was stirred for 40 minutes under heating and reflux. . After returning the reaction system to room temperature, 1N hydrochloric acid was added to adjust to pH = 4. After extraction with chloroform, the organic layer was dried over anhydrous sodium sulfate and then the solvent was distilled off to obtain 1.18 g (quantitative) of the desired product.
[0220]
1H-NMR (CDClThree, Ppm)
2.71 (2H, t, J = 5.7 Hz), 3.79 (2H, t, J = 5.7 Hz), 4.64 (2H, s), 4.67 (2H, s), 6. 01 (1H, d, J = 2.2 Hz), 7.30-7.38 (5H, m), 7.74 (1H, d, J = 2.2 Hz)
[0221]
Reference Example 19
Preparation of 5- (benzyloxymethyl) -7-chloro-6- (2-chloroethyl) pyrazolo [1,5-a] pyrimidine:
To 0.52 g of 5- (benzyloxymethyl) -6- (2-hydroxyethyl) pyrazolo [1,5-a] pyrimidin-7 (4H) -one, 4.0 ml of phosphorus oxychloride and 0.55 ml of triethylamine were added. The mixture was stirred at an oil bath temperature of 100 to 110 ° C. for 1 hour and 20 minutes. Excess phosphorus oxychloride was distilled off under reduced pressure, and the reaction residue was poured into ice water and extracted with chloroform. The chloroform layer was dried over anhydrous sodium sulfate, and then the solvent was distilled off under reduced pressure. The crude product obtained here was subjected to silica gel column chromatography (elution solvent chloroform only) to obtain 0.37 g of the desired product. Yield 63.4%.
[0222]
1H-NMR (CDClThree, Ppm)
3.39 (2H, t, J = 7.3 Hz), 3.75 (2H, t, J = 7.3 Hz), 4.65 (2H, s), 4.77 (2H, s), 6. 79 (1H, d, J = 2.2 Hz), 7.30-7.37 (5H, m), 8.19 (1H, d, J = 2.2 Hz)
[0223]
Example 68
Preparation of 7-chloro-6- (2-chloroethyl) -5- (2 ', 4'-dinitrobenzyloxymethyl) -3-nitropyrazolo [1,5-a] pyrimidine:
4.0 ml of concentrated sulfuric acid was cooled to 0 ° C., and 2.0 ml of 90% concentrated nitric acid was gradually added so that the temperature did not rise. Under the same conditions, 5-benzyloxymethyl-7-chloro-6- (2 -Chloroethyl) pyrazolo [1,5-a] pyrimidine (0.37 g) was gradually added and stirred for 1 hour. Since the raw material spot disappeared on TLC, the stirring was stopped and the reaction solution was poured into ice water. The resulting crystals were collected by filtration, washed with water several times, and dried to obtain the desired product. Yield 0.35g. Yield 67.5%.
[0224]
1H-NMR (DMSO-d6, Ppm)
3.45 (2H, t, J = 7.6 Hz), 3.87 (2H, t, J = 7.6 Hz), 5.14 (2H, s), 5.19 (2H, s), 8. 20 (1H, d, J = 8.9 Hz), 8.60 (1H, dd, J = 8.9 Hz, 2.4 Hz), 8.79 (1H, d, J = 2.4 Hz), 9.19 (1H, s)
[0225]
Example 69
8-sec-butyl-6,7-dihydro-5- (2 ', 4'-dinitrobenzyloxymethyl) -3-nitro-8H-pyrrolo [3,2-e] pyrazolo [1,5-a] pyrimidine Production of (Compound 88):
7-Chloro-6- (2-chloroethyl) -5- (2 ', 4'-dinitrobenzyloxymethyl) -3-nitropyrazolo [1,5-a] pyrimidine (0.35 g) was dissolved in dimethylformamide (5.0 ml). , 0.18 g of sec-butylamine was added, and the mixture was stirred at room temperature for 1 hour and 30 minutes. The solvent was distilled off under reduced pressure, and 50 ml of chloroform was added to the residue, followed by washing with 1N hydrochloric acid and saturated brine. The organic layer was dried over anhydrous sodium sulfate and the solvent was distilled off under reduced pressure. The obtained crystals were reprecipitated from the chloroform-ether system and air-dried. Further, this crude product was subjected to preparative thin layer chromatography (developing solvent: chloroform: methanol = 19: 1) to obtain 0.14 g of the desired product. Yield 40.0%.
[0226]
Yellow crystals
IR (KBr tablet, cm-1)
1624, 1225
m. p.
167-168 ° C
1H-NMR (CDClThree, Ppm)
0.96 (3H, t, J = 7.3 Hz), 1.34 (3H, d, J = 6.5 Hz), 1.69 (2H, m), 3.29 (2H, t, J = 8) .9Hz), 3.86 (2H, m), 4.81 (2H, s), 5.13 (2H, s), 5.65 (1H, m), 8.23 (1H, d, J = 8.4 Hz), 8.53 (1 H, dd, J = 8.4 Hz, 2.2 Hz), 8.62 (1 H, s), 8.92 (1 H, d, J = 2.2 Hz)
[0227]
Example 70
Tracheal dilation (in vitro)
About the compound (1) of this invention, the trachea dilation effect useful for treatment and / or prevention of respiratory diseases, such as asthma, was investigated by the Magnus method. That is, the trachea was extracted after the Hartley white male guinea pig (250 to 300 g) was bruised and exsanguinated. A strip-shaped specimen is prepared from this trachea and mixed gas (95% O25% CO2) And suspended in a Magnus tube filled with Krebs-Henseleit solution kept at 37 ° C. An isometric tension was recorded by applying a static tension of 1.0 g. Test compound is 3 × 10-7M carbachol and 10-6The sample was contracted with M histamine and cumulatively administered to examine the relaxation effect. 10 after cumulative dosing-FourM papaverine was administered to confirm the maximum relaxation effect of the trachea specimen. PIC is calculated by calculating the negative logarithm of the concentration of the test compound that causes the maximum relaxation to be 100% and 50% relaxation.50Value. The results are shown in Table 1. From this, it can be seen that the compound represented by the general formula (1) of the present invention and / or physiologically acceptable salts thereof are excellent in the trachea dilating action. RThreeIt can also be seen that a nitro group is preferred as the substituent of
[0228]
[Table 1]
[0229]
Example 71
Tracheal dilation (in vitro)
As in Example 70, using the extracted trachea by the Magnus method (LTDFour, Concentration 10-6M), (CTA2, Concentration 10-7M), pIC of compounds of the invention against contraction by (OA, concentration 1 mg / ml)50The value was determined. The results are shown in Table 2. It can be seen that the compounds of the present invention and / or physiologically acceptable salts thereof are also effective against these contractions.
[0230]
[Table 2]
[0231]
Example 72
Inhibition of airway contraction response (in vivo)
A group of 6 Hartley white male guinea pigs (250-350 g) was anesthetized with pentobarbitur and cannulae were inserted into the trachea, carotid artery and jugular vein. The experiment was performed under artificial aspiration after the airway cannula was connected to a ventilator incorporated in the circuit of Broncospasm Transducer (Modified Consett-Ressler method), and spontaneous breathing was stopped by excision of the diaphragm. The airway contraction response was measured using the ventilation overflow amount as an index. At the same time, blood pressure was monitored using a blood pressure measurement amplifier via a cannula inserted into the carotid artery. Test compound (1 mg / ml / kg) dissolved in 0.1N hydrochloric acid was intravenously administered, and 0.5, 5 and 10 minutes later, acetylcholine (20 μg / kg) or histamine (15 μg / kg) was intravenously administered. Airway contraction response was observed. As a comparative example, theophylline (6 mg / ml / kg) generally used widely for the treatment of asthma was used. The numerical value was calculated as the inhibition rate. The results are shown in Table 3 together with changes in blood pressure (unit: mmHg). It can be seen that the compounds of the present invention have little effect on blood pressure despite being excellent in the action of suppressing tracheal contraction.
[0232]
[Table 3]
[0233]
Example 73
Inhibition of airway contraction response (in vivo)
The esophagus was cannulated, and the test compound (100 mg / 2 ml / kg) suspended in 1% CMC was administered from this esophageal cannula, and acetylcholine and histamine were intravenously injected at 15, 30, 60, and 120 minutes. In the same manner as in Example 72, the effect of the compound of the present invention on airway contraction was determined by oral administration. The results are shown in Table 4. It can be seen that all of the compounds of the present invention have little effect on blood pressure despite being excellent in the action of suppressing tracheal contraction. The blood pressure drop was 120 minutes, and the dose of comparative theophylline was 100 mg / kg. Furthermore, no death was observed at a dose of 100 mg / kg, and therefore the safety of the compound of the present invention is considered high.
[0234]
[Table 4]

Claims (7)

次の一般式(1)
〔式中、R1は直鎖、分岐鎖若しくは環状のアルキル基を示し、R2は水素原子、ハロゲン原子、置換基としてヒドロキシ基又はジニトロベンジルオキシ基を有していてもよいアルキル基、置換基としてアルキル基を有していてもよいアミノ基、ピロリジノ基、ピペリジノ基、モルホリノ基、カルボキシル基、アルコキシカルボニル基又はカルバモイル基を示し、R3はニトロ基又はトリフルオロアセチル基を示す〕で表されるピロロピラゾロピリミジン化合物又はその塩。
The following general formula (1)
[In the formula, R 1 represents a linear, branched or cyclic alkyl group, R 2 represents a hydrogen atom, a halogen atom, an alkyl group which may have a hydroxy group or a dinitrobenzyloxy group as a substituent, a substituted group; An amino group optionally having an alkyl group , a pyrrolidino group, a piperidino group, a morpholino group, a carboxyl group, an alkoxycarbonyl group or a carbamoyl group, and R 3 represents a nitro group or a trifluoroacetyl group. A pyrrolopyrazolopyrimidine compound or a salt thereof.
1が炭素数1〜10の直鎖、分岐鎖若しくは環状のアルキル基であり;R2が水素原子、ハロゲン原子、アミノ基、C 1-10 のアルキル基、カルボキシル基又はC2-11アルコキシカルボニル基である請求項1記載の化合物又はその塩。R 1 is straight-chain having 1 to 10 carbon atoms, be branched-chain or cyclic alkyl group; R 2 is a hydrogen atom, a halogen atom, amino group, alkyl group of C 1-10, a carboxyl group or a C 2-11 alkoxy compound or a salt thereof Motomeko 1, wherein a carbonyl group. 請求項1又は2記載の化合物又はその塩を有効成分とする医薬。  The pharmaceutical which uses the compound or its salt of Claim 1 or 2 as an active ingredient. 呼吸器疾患用薬である請求項3記載の医薬。  The medicament according to claim 3, which is a drug for respiratory diseases. 次の一般式(2)
〔式中、Xはハロゲン原子を示し、R2は水素原子、ハロゲン原子、置換基としてヒドロキシ基又はジニトロベンジルオキシ基を有していてもよいアルキル基、置換基としてアルキル基を有していてもよいアミノ基、ピロリジノ基、ピペリジノ基、モルホリノ基、カルボキシル基、アルコキシカルボニル基又はカルバモイル基を示し、R3はニトロ基又はトリフルオロアセチル基を示す〕で表される化合物に、式NH2−R1(ここで、R1は直鎖、分岐鎖又は環状のアルキル基を示す〕で表されるアミン類を反応させることを特徴とする次の一般式(1)
〔式中、R1、R2及びR3は前記と同じものを示す〕で表されるピロロピラゾロピリミジン化合物又はその塩の製造法。
The following general formula (2)
[Wherein, X represents a halogen atom, R 2 represents a hydrogen atom, a halogen atom, an alkyl group which may have a hydroxy group or a dinitrobenzyloxy group as a substituent , and an alkyl group as a substituent. also an amino group, pyrrolidino group, piperidino group, morpholino group, a carboxyl group, an alkoxycarbonyl group, or carbamoyl group, R 3 is a compound represented by a nitro group or a trifluoroacetyl group], the formula NH 2 - The following general formula (1), characterized by reacting an amine represented by R 1 (wherein R 1 represents a linear, branched or cyclic alkyl group)
[Wherein R 1 , R 2 and R 3 are the same as defined above], and a method for producing a pyrrolopyrazolopyrimidine compound or a salt thereof.
次の一般式(3)
〔式中、R2は水素原子、ハロゲン原子、置換基としてヒドロキシ基又はジニトロベンジルオキシ基を有していてもよいアルキル基、置換基としてアルキル基を有していてもよいアミノ基、ピロリジノ基、ピペリジノ基、モルホリノ基、カルボキシル基、アルコキシカルボニル基又はカルバモイル基を示し、R3はニトロ基又はトリフルオロアセチル基を示す〕で表される化合物又はその互変異性体にハロゲン化剤を反応させて次の一般式(2)
〔式中、R2及びR3は前記と同じものを示し、Xはハロゲン原子を示す〕で表される化合物とし、これに式NH2−R1(ここで、R1は直鎖、分岐鎖又は環状のアルキル基を示す〕で表されるアミン類を反応させることを特徴とする次の一般式(1)
〔式中、R1、R2及びR3は前記と同じものを示す〕で表されるピロロピラゾロピリミジン化合物又はその塩の製造法。
The following general formula (3)
[In the formula, R 2 represents a hydrogen atom, a halogen atom, an alkyl group which may have a hydroxy group or a dinitrobenzyloxy group as a substituent , an amino group which may have an alkyl group as a substituent, or a pyrrolidino group. A piperidino group, a morpholino group, a carboxyl group, an alkoxycarbonyl group or a carbamoyl group, and R 3 represents a nitro group or a trifluoroacetyl group ] or a tautomer thereof, and a halogenating agent is reacted. The following general formula (2)
[Wherein R 2 and R 3 are the same as those described above, and X represents a halogen atom], which is represented by the formula NH 2 -R 1 (where R 1 is linear, branched) A chain or a cyclic alkyl group] is reacted with the following general formula (1)
[Wherein R 1 , R 2 and R 3 are the same as defined above], and a method for producing a pyrrolopyrazolopyrimidine compound or a salt thereof.
次の一般式(6)
〔式中、Zは水酸基又はハロゲン原子を示し、Yは水酸基又はハロゲン原子を示し、R2は水素原子、ハロゲン原子、置換基としてヒドロキシ基又はジニトロベンジルオキシ基を有していてもよいアルキル基、置換基としてアルキル基を有していてもよいアミノ基、ピロリジノ基、ピペリジノ基、モルホリノ基、カルボキシル基、アルコキシカルボニル基又はカルバモイル基を示し、R3はニトロ基又はトリフルオロアセチル基を示す〕で表されるピラゾロピリミジン化合物、その互変異性体又はそれらの塩。
The following general formula (6)
[In the formula, Z represents a hydroxyl group or a halogen atom, Y represents a hydroxyl group or a halogen atom, R 2 represents a hydrogen atom, a halogen atom, or an alkyl group optionally having a hydroxy group or a dinitrobenzyloxy group as a substituent. An amino group optionally having an alkyl group as a substituent, a pyrrolidino group, a piperidino group, a morpholino group, a carboxyl group, an alkoxycarbonyl group or a carbamoyl group, and R 3 represents a nitro group or a trifluoroacetyl group. The pyrazolopyrimidine compound represented by these, its tautomer, or those salts.
JP23086297A 1996-08-28 1997-08-27 Pyrrolopyrazolopyrimidine compounds and pharmaceuticals containing the same as active ingredients Expired - Fee Related JP3898296B2 (en)

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WO2003006024A1 (en) 2001-07-13 2003-01-23 Btg International Ltd. Medicine containing pyrimidine derivative
BR0309475A (en) 2002-04-23 2005-03-01 Shionogi & Co Pyrazolo [1,5-a] pyrimidine derivatives and nad (p) h oxidase inhibitors containing them
WO2005087775A1 (en) * 2004-03-15 2005-09-22 Ono Pharmaceutical Co., Ltd. Tricyclic heterocyclic compound and medicinal composition containing the compound as active ingredient
SG196855A1 (en) 2008-10-22 2014-02-13 Array Biopharma Inc Substituted pyrazolo[1,5-a]pyrimidine compounds as trk kinase inhibitors
AR077468A1 (en) 2009-07-09 2011-08-31 Array Biopharma Inc PIRAZOLO COMPOUNDS (1,5-A) PYRIMIDINE SUBSTITUTED AS TRK-QUINASA INHIBITORS
US8933084B2 (en) 2010-05-20 2015-01-13 Array Biopharma Inc. Macrocyclic compounds as Trk kinase inhibitors
DK3699181T3 (en) 2014-11-16 2023-03-20 Array Biopharma Inc CRYSTALLINE FORM OF (S)-N-(5-((R)-2-(2,5-DIFLUORPHENYL)-PYRROLIDIN-1-YL)-PYRAZOLO[1,5-A]PYRIMIDIN-3-YL)-3 -HYDROXYPYRROLIDINE-1-CARBOXAMIDE HYDROGEN SULFATE
WO2017075107A1 (en) 2015-10-26 2017-05-04 Nanda Nisha Point mutations in trk inhibitor-resistant cancer and methods relating to the same
EP3439662B1 (en) 2016-04-04 2024-07-24 Loxo Oncology, Inc. Liquid formulations of (s)-n-(5-((r)-2-(2,5-difluorophenyl)-pyrrolidin-1-yl)-pyrazolo[1,5-a]pyrimidin-3-yl)-3-hydroxypyrrolidine-1-carboxamide
US10045991B2 (en) 2016-04-04 2018-08-14 Loxo Oncology, Inc. Methods of treating pediatric cancers
SI3800189T1 (en) 2016-05-18 2023-11-30 Loxo Oncology, Inc. Preparation of (s)-n-(5-((r)-2-(2,5-difluorophenyl)pyrrolidin-1-yl)pyrazolo(1,5-a)pyrimidin-3-yl)-3-hydroxypyrrolidine-1-carboxamide
JOP20190092A1 (en) 2016-10-26 2019-04-25 Array Biopharma Inc PROCESS FOR THE PREPARATION OF PYRAZOLO[1,5-a]PYRIMIDINES AND SALTS THEREOF
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