CN101445438B - 一种3-甲氧基丙醛的合成方法 - Google Patents
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Abstract
本发明公开了一种如式(I)所示的3-甲氧基丙醛的合成方法:在无溶剂存在下,式(II)所示的3-甲氧基-1,2-丙二醇在催化剂作用下,于150-250℃温度条件发生脱水反应,反应完毕反应液后处理得式(I)所示的3-甲氧基丙醛;所述的催化剂包括主催化剂,所述的主催化剂为硫酸、对甲苯磺酸、硫酸铜、硫酸氢铜、硫酸氢钾、一水硫酸氢钠或酸性离子液体。本发明提供的3-甲氧基丙醛合成方法,原料易得,成本低廉,操作简单,对环境友好。
Description
(一)技术领域:
本发明涉及一种3-甲氧基丙醛的合成方法。
(二)背景技术:
3-甲氧基丙醛是高效、低毒,咪唑啉酮类除草剂甲氧咪草烟的重要原料之一。3-甲氧基丙醛可以用于合成血清素和降肾上腺素的抑制剂(N-(3-methoxypropyl)-N-arylmethylpiperidin-4-amines),以及合成香料甲基茉莉酸等。
已有的合成方法主要有以3-甲氧基丙醇为原料,在二氯甲烷中以氯铬酸吡啶嗡盐为氧化剂发生氧化反应制备3-甲氧基丙醛(Juric,S.;Kronja,O.J.Phys.Org.Chem.2002,15,556),反应收率为36.8%。还有报道(Alagona G.等,Organometallics,20(25),5394-5404,2001)以甲氧基乙烯为原料,在金属铑的催化作用下与一氧化碳,氢气经过加氢醛化,得到3-甲氧基丙醛,转化率和选择性均不理想。Procopio A.等(Synlett,14,2633-2635,2004)报道了以甲氧基环氧丙醇为原料,在二氯甲烷溶剂中以三氟甲磺酸铒为催化剂,经过重排反应生成3-甲氧基丙醛。所用催化剂比较昂贵,不易得。此外,还有报道以丙烯醛为原料,与甲醇加成反应生成3-甲氧基丙醛,例如德国专利DE10122268,DE10138967,日本专利JP2001247507等。但是所用原料丙烯醛是高毒类化合物,刺激性较大,对环境污染严重。
(三)发明内容:
本发明提供了一种3-甲氧基丙醛的合成方法。该方法是:
一种如式(I)所示的3-甲氧基丙醛的合成方法,所述的方法按如下步骤进行:在无溶剂存在下,式(II)所示的3-甲氧基-1,2-丙二醇在催化剂作用下,于150-250℃温度条件下发生脱水反应,反应完毕反应液经后处理生成式(I)所示的3-甲氧基丙醛。
本发明所述的合成方法的反应方程式如下:
本发明所述的脱水反应的催化剂包括主催化剂,所述的主催化剂为质子酸或酸性离子液体,如硫酸、对甲苯磺酸、硫酸铜、硫酸氢铜、硫酸氢钾、一水硫酸氢钠或酸性离子液体,所述的酸性离子液体为1-(4-磺酸丁基)-3-甲基咪唑硫酸氢盐、1-(4-磺酸丁基)吡啶硫酸氢盐、N,N,N-三乙基-3-磺酸丙胺硫酸氢盐,1-(3-磺酸丙基)-3-甲基咪唑硫酸氢盐或1-丁基-3-甲基咪唑三氟甲磺酸盐,主催化剂优选为一水硫酸氢钠或硫酸铜。所述主催化剂加入量为3-甲氧基-1,2-丙二醇质量的5-20%,优选为10-15%。
本发明所述催化剂还可以包括助催化剂,所述的脱水反应的助催化剂为相转移催化剂,如环糊精或分子量为200-800的聚乙二醇等,或一种以上的混合物;优选为下列之一或一种以上的混合物:β-环糊精、分子量为400~600的聚乙二醇。所述助催化剂加入量为3-甲氧基-1,2-丙二醇质量的0-20%,优选为10-15%,助催化剂加入量为3-甲氧基-1,2-丙二醇质量的0-20%,其中0的含义是助催化剂可以无限接近于0。
本发明所述的脱水反应在150-250℃温度条件下进行,优选为190-210℃,反应时间优选为0.5-3h。
本发明所述的后处理为,反应结束,反应液常压蒸馏得3-甲氧基丙醛粗品,将粗品常压精馏,收集108-112℃馏分,得到3-甲氧基丙醛纯品。
较为具体的,推荐本发明按照如下步骤进行:
在无溶剂存在下,式(II)所示的3-甲氧基-1,2-丙二醇在催化剂作用下,于190~210℃温度条件发生脱水反应0.5-3h,反应完成后反应液常压蒸馏得3-甲氧基丙醛粗品,将粗品常压精馏,收集108-112℃馏分,得到3-甲氧基丙醛纯品;所述的催化剂包括主催化剂和助催化剂,所述的主催化剂为一水硫酸氢钠或硫酸铜,主催化剂加入量为3-甲氧基-1,2-丙二醇质量的10~15%;所述的助催化剂为β-环糊精、分子量为400~600的聚乙二醇或两者的混合物,所述的助催化剂加入量为3-甲氧基-1,2-丙二醇质量的10~15%。
本发明的3-甲氧基丙醛合成方法,原料易得,操作简单,对环境友好。
(四)实施方式:
下面结合具体实施例对本发明进行进一步描述,但本发明的保护范围并不限于此:
实施例1
在三口烧瓶中,加入4g 3-甲氧基-1,2-丙二醇,0.6g硫酸铜,0.6gPEG600,搅拌升温,在200℃下反应1h,常压蒸馏,得到3-甲氧基丙醛粗馏分。GC检测分析,3-甲氧基丙醛含量为65%,收率为40%。
实施例2
在三口烧瓶中,加入200g 3-甲氧基-1,2-丙二醇,30g硫酸铜,30gPEG600,搅拌升温,在200℃下反应3h,常压蒸馏,得到3-甲氧基丙醛粗馏分。将粗馏分常压精馏,收集108-112℃的馏分,得到66g3-甲氧基丙醛纯品,收率为40%。
实施例3
参考实施例1的方法,改变反应的温度为150℃,其他反应条件与实施例1相同,得到3-甲氧基丙醛。GC检测分析,3-甲氧基丙醛含量为40%,收率为18%。
实施例4
参考实施例1的方法,改变反应的温度为250℃,其他反应条件与实施例1相同,得到3-甲氧基丙醛。GC检测分析,3-甲氧基丙醛含量为58%,收率为34%。
实施例5
参考实施例2的方法,改变反应的温度为250℃,其他反应条件与实施例2相同,得到60g3-甲氧基丙醛纯品,收率为36%。
实施例6
参考实施例1的方法,改变催化剂的用量,硫酸铜用量为0.2g,PEG600用量为0.2g,其他反应条件与实施例1相同,得到3-甲氧基丙醛。GC检测分析,3-甲氧基丙醛含量为20%,收率为25%。。
实施例7
参考实施例1的方法,改变催化剂的用量,硫酸铜用量为0.8g,PEG600用量为0.8g,其他反应条件与实施例1相同,得到3-甲氧基丙醛。GC检测分析,3-甲氧基丙醛含量为62%,收率为38%。
实施例8-17
参考实施例1的方法,改变反应所用催化剂,分别用硫酸,对甲苯磺酸,硫酸氢铜,硫酸氢钾,酸性离子液体替代硫酸铜,催化剂质量仍为0.6g,其他反应条件与实施例1相同,得到了3-甲氧基丙醛,用GC检测分析,结果如表1。
表1催化剂改变对反应的影响
实施例 | 催化剂 | 3-甲氧基丙醛含量(%) | 收率(%) |
8 | p-MeC6H4SO3H | 12.0 | 6.2 |
9 | H2SO4 | 11.4 | 5.0 |
10 | NaHSO4·H2O | 44.4 | 20.9 |
11 | CuSO4·5H2O | 41.3 | 20.8 |
12 | CuSO4 | 51.4 | 29.6 |
13 | Cu(HSO4)2 | 36.2 | 17.4 |
14 | KHSO4 | 27.0 | 7.6 |
15 | [TEPSA][HSO4] | 30.1 | 13.3 |
16 | [HSO3-BMIM][HSO4] | 30.9 | 3.9 |
17 | [HSO3-BPy][HSO4] | 23.9 | 9.9 |
注:[TEPSA][HSO4]:N,N,N-三乙基-3-磺酸丙胺硫酸氢盐
[HSO3-BMIM][HSO4]:1-(4-磺酸丁基)-3-甲基咪唑硫酸氢盐
[HSO3-BPy][HSO4]:1-(4-磺酸丁基)吡啶硫酸氢盐、
实施例18-26
参考实施例1的方法,改变反应所用催化剂,主催化剂用一水硫酸氢钠,硫酸铜,助催化剂用β-环糊精,聚乙二醇200、400、800,催化剂用量如表2所示,其他反应条件与实施例1相同,得到了3-甲氧基丙醛,用GC检测分析,结果如表2.
表2不同催化剂对反应的影响
实施例 | 催化剂(wt%) | 3-甲氧基丙醛含量(%) | 收率(%) |
18 | NaHSO4·H2O(15)PEG400(5) | 44.5 | 23.1 |
19 | CuSO4(15)PEG400(5) | 46.0 | 23.9 |
20 | CuSO4(15)PEG400(15) | 59.2 | 30.6 |
21 | NaHSO4·H2O(15)PEG400(15) | 48.3 | 27.3 |
22 | CuSO4(15)PEG400(5) | 53.6 | 27.5 |
β-CD(5) | |||
23 | NaHSO4·H2O(15)PEG400(5)β-CD(5) | 53.2 | 28.2 |
24 | CuSO4(15)PEG200(15) | 20.3 | 12.2 |
25 | CuSO4(15)PEG800(15) | 20.6 | 12.1 |
26 | CuSO4(15)β-CD(15) | 28.4 | 13.9 |
Claims (9)
2.如权利要求1所述的合成方法,其特征在于所述的温度条件为190~210℃。
3.如权利要求1所述的合成方法,其特征在于所述的主催化剂的加入量为3-甲氧基-1,2-丙二醇质量的10~15%。
4.如权利要求1所述的合成方法,其特征在于所述的助催化剂的加入量为3-甲氧基-1,2-丙二醇质量的10~15%。
5.如权利要求1所述的合成方法,其特征在于所述的酸性离子液体为1-(4-磺酸丁基)-3-甲基咪唑硫酸氢盐、1-(4-磺酸丁基)吡啶硫酸氢盐、N,N,N-三乙基-3-磺酸丙胺硫酸氢盐、1-(3-磺酸丙基)-3-甲基咪唑硫酸氢盐或1-丁基-3-甲基咪唑三氟甲磺酸盐。
6.如权利要求1所述的合成方法,其特征在于所述的后处理为:反应结束,反应液常压蒸馏得3-甲氧基丙醛粗品,将粗品常压精馏,收集108-112℃馏分,得到3-甲氧基丙醛纯品。
7.如权利要求1所述的合成方法,其特征在于所述的脱水反应反应时间为0.5-3h。
8.如权利要求1所述的合成方法,其特征在于所述的主催化剂为一水硫酸氢钠或硫酸铜,所述的助催化剂为下列之一或一种以上的混合物:β-环糊精或分子量为400~600的聚乙二醇。
9.如权利要求1所述的合成方法,其特征在于所述的方法按如下步骤进行:在无溶剂存在下,式(II)所示的3-甲氧基-1,2-丙二醇在催化剂作用下,于190~210℃温度条件发生脱水反应0.5-3h,反应完成后反应液常压蒸馏得得3-甲氧基丙醛粗品,将粗品常压精馏,收集108-112℃馏分,得到3-甲氧基丙醛纯品;所述的催化剂包括主催化剂和助催化剂,所述的主催化剂为一水硫酸氢钠或硫酸铜,主催化剂加入量为3-甲氧基-1,2-丙二醇质量的10~15%;所述的助催化剂为β-环糊精、分子量为400~600的聚乙二醇或两者的混合物,所述的助催化剂加入量为3-甲氧基-1,2-丙二醇质量的10~15%。
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