CN109970631A - 一种5-碘-2-吡啶乙酸的合成方法 - Google Patents

一种5-碘-2-吡啶乙酸的合成方法 Download PDF

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CN109970631A
CN109970631A CN201910231401.0A CN201910231401A CN109970631A CN 109970631 A CN109970631 A CN 109970631A CN 201910231401 A CN201910231401 A CN 201910231401A CN 109970631 A CN109970631 A CN 109970631A
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iodo
acid
synthetic method
pyridylacetic acid
pyridylacetic
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徐红岩
马敬祥
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Shanghai Jiyan Biotechnology Co Ltd
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Shanghai Jiyan Biotechnology Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D213/00Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
    • C07D213/02Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
    • C07D213/04Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D213/60Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D213/61Halogen atoms or nitro radicals

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  • Organic Chemistry (AREA)
  • Pyridine Compounds (AREA)

Abstract

本发明涉及一种5‑碘‑2‑吡啶乙酸的合成方法。主要解决5‑碘‑2‑吡啶乙酸无法采用合硅胶色谱柱纯化制备的技术问题。本发明合成方法包括以下步骤:氰乙酸叔丁酯在二甲基亚砜溶液中,和氢化钠反应,生成的中间体和2‑溴‑5‑碘吡啶反应,生成化合物1;化合物1在盐酸溶液中,加热脱羧、氰基水解,生成目标化合物2;作为价格昂贵的医药中间体,5‑碘‑2‑吡啶乙酸在化学制药领域有广泛的应用前景,可用于合成KX2‑391,一种高选择性的Src激酶抑制剂。

Description

一种5-碘-2-吡啶乙酸的合成方法
技术领域
本发明涉及到5-碘-2-吡啶乙酸(CAS:1234616-74-0)的合成方法。
背景技术
作为价格昂贵的医药中间体,5-碘-2-吡啶乙酸在化学制药领域有广泛的应用前景,可用于合成KX2-391,一种高选择性的Src激酶抑制剂。
KX2-391是一种非ATP竞争性Src抑制剂,也是第一种靶向Src激酶底物结合位点的抑制剂,最早报导于US Patent 7,300,931, 其合成方法如下:
5-溴-2-吡啶乙酸作为一种医药中间体,其合成方法和应用,已经以专利的形式报导出来,常见的合成方法是5-溴-2-碘吡啶和丙二酸脂反应,经过水解、脱羧得到;作为反应活性更大的5-碘-2-吡啶乙酸,因为其活性大,容易脱羧,不适合硅胶色谱柱纯化,无法用此方法合成。
发明内容
本发明的目的是提供一种5-碘-2-吡啶乙酸的合成方法,主要解决5-碘-2-吡啶乙酸无法采用合硅胶色谱柱纯化制备的技术问题。
本发明技术方案为:一种5-碘-2-吡啶乙酸的合成方法,其特征是包括以下步骤:第一步,氰乙酸叔丁酯在二甲基亚砜溶液中,和氢化钠反应,生成的中间体和2-溴-5-碘吡啶反应,生成化合物1;第二步,化合物1在盐酸溶液中,加热脱羧、氰基水解,生成目标化合物2。合成线路如下:
第一步反应125 ℃,反应时间为6小时;第二步反应在6 M盐酸中反应,反应温度为100℃,反应时间为3小时。反应后用2 M的氢氧化钠水溶液调pH = 9-10,进行萃取;再用2 M的盐酸盐调pH = 4进行抽滤干燥。
本发明的有益效果是:本发明首次报导了5-碘-2-吡啶乙酸的合成方法,化合物1经过脱羧、水解,即可得到高纯度的目标化合物2。本发明的反应线路独特,原料便宜,无需色谱柱纯化,适合于放大生产。
具体实施方式
步骤1:
向1 升三口烧瓶中加入二甲基亚砜 (500 mL),在室温时加入氢化钠 (60%,27.7 g,692 mmol),滴加氰乙酸叔丁酯(100.7 g,713 mmol),约1小时滴完,室温搅拌半小时,再加2-溴-5-碘吡啶(76.7 g,270 mmol),加热至125 ℃,反应6小时,停止加热,冷至室温后,搅拌下将反应液慢慢倒入氯化铵溶液中(150 g氯化铵溶于1.5 L水),析出固体,抽滤,水洗,将固体溶于约乙酸乙酯(2 L),饱和食盐水洗涤,有机相干燥,旋干,用乙酸乙酯和石油醚混合液(体积比1:10,200 mL)打浆,抽滤出固体,转入纸盘过夜晾干,得到黄色固体,目标化合物1(54 g,157 mmol, 58%);
步骤2:
向1 升三口烧瓶中加入加入水(300 mL),浓盐酸(300 mL)和目标化合物1(54 g,157mmol),加热至100℃,反应3小时。黄色固体消失,反应液变为浅棕色。将反应液转至1升单口瓶,在70℃旋蒸至糊状,冷至室温,再加少量碎冰(100 g),在冰浴中,慢慢加2 M的氢氧化钠水溶液调pH = 9-10(约400 mL),用甲基叔丁基醚(200 mL)萃取两次,弃去有机相,水相抽滤后,用2 M的盐酸盐调pH = 4,析出土黄色固体,再搅拌10分钟后抽滤,用少量水洗,固体转入真空干燥箱,40 ℃真空干燥2小时,得土黄色固体,目标化合物2(30 g,114 mmol,73%)。1H NMR (400 MHz, DMSO-d6): 12.89 (s, 1 H), 8.69 (d, J = 1.6 Hz, 1 H),8.10-8.08 (m, 1 H), 7.20 (d, J = 1.6 Hz, 1 H), 3.69 (s, 2 H)。

Claims (6)

1.一种5-碘-2-吡啶乙酸的合成方法, 其特征是:包括以下步骤:第一步,氰乙酸叔丁酯在二甲基亚砜溶液中,和氢化钠反应,生成的中间体和2-溴-5-碘吡啶反应,生成化合物1;第二步,化合物1在盐酸溶液中,加热脱羧、氰基水解,生成目标化合物2;合成线路如下:
2.根据权利要求1所述的一种5-碘-2-吡啶乙酸的合成方法, 其特征是:第一步反应温度125 ℃,反应时间为6小时。
3.根据权利要求1所述的一种5-碘-2-吡啶乙酸的合成方法, 其特征是:第二步在6 M盐酸中反应。
4.根据权利要求1所述的一种5-碘-2-吡啶乙酸的合成方法, 其特征是:第二步反应温度为100℃时,反应3小时。
5.根据权利要求4所述的一种5-碘-2-吡啶乙酸的合成方法, 其特征是:第二步反应后用2 M的氢氧化钠水溶液调pH = 9-10进行萃取。
6.根据权利要求5所述的一种5-碘-2-吡啶乙酸的合成方法, 其特征是:萃取后用2 M的盐酸调pH = 4进行抽滤干燥。
CN201910231401.0A 2019-03-26 2019-03-26 一种5-碘-2-吡啶乙酸的合成方法 Pending CN109970631A (zh)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102939290A (zh) * 2010-03-19 2013-02-20 辉瑞大药厂 2,3-二氢-1h-茚-1-基-2,7-二氮杂螺[3.6]壬烷衍生物及其作为生长激素释放肽受体的拮抗剂或反向激动剂的用途
WO2015092610A1 (en) * 2013-12-20 2015-06-25 Pfizer Limited N-acylpiperidine ether tropomyosin-related kinase inhibitors
CN108026045A (zh) * 2015-05-15 2018-05-11 奥瑞基尼探索技术有限公司 用作RORγ调节剂的经过取代的四氢喹啉酮化合物

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102939290A (zh) * 2010-03-19 2013-02-20 辉瑞大药厂 2,3-二氢-1h-茚-1-基-2,7-二氮杂螺[3.6]壬烷衍生物及其作为生长激素释放肽受体的拮抗剂或反向激动剂的用途
WO2015092610A1 (en) * 2013-12-20 2015-06-25 Pfizer Limited N-acylpiperidine ether tropomyosin-related kinase inhibitors
CN108026045A (zh) * 2015-05-15 2018-05-11 奥瑞基尼探索技术有限公司 用作RORγ调节剂的经过取代的四氢喹啉酮化合物

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