Process for the Preparation of 4-(1-Hydroxy-1-Methylethyl)-2-Propyl-Imidazole-5-Carboxylates
申请人:Zhang Fuli
公开号:US20120095237A1
公开(公告)日:2012-04-19
The present invention discloses a process for obtaining 4-(1-hydroxy-1-methylethyl)-2-propyl-imidazole-5-carboxylate (formula I) by the reaction of 4,4-dimethyl-2-propyl-4,6-dihydrofuro[3,4-d]imidazole (formula II), or its hydrolysis product, or its ring-opening product, with alcohol under appropriate catalytic conditions. Furthermore, the present invention also provides a process for obtaining high purity 4,4-dimethyl-2-propyl-4,6-dihydrofuro[3,4-d]imidazole (formula II), therefore purified compound of formula I can be produced. Producing of olmesartan medoxomil at high purity is assured by said processes. R in formula I is selected from C
1
-C
6
alkyl.
本发明揭示了一种通过在适当的催化条件下将4,4-二甲基-2-丙基-4,6-二氢呋喃[3,4-d]咪唑(式II)或其水解产物或其开环产物与醇反应而获得4-(1-羟基-1-甲基乙基)-2-丙基-咪唑-5-羧酸酯(式I)的方法。此外,本发明还提供了一种获得高纯度4,4-二甲基-2-丙基-4,6-二氢呋喃[3,4-d]咪唑(式II)的方法,因此可以生产出纯化的式I化合物。通过这些方法可以确保高纯度的奥美沙坦酯的生产。式I中的R选择自C1-C6烷基。