申请人:Parthasaradhi Reddy Bandi
公开号:US20100234614A1
公开(公告)日:2010-09-16
The present invention provides an improved and commercially viable process for preparation of irbesartan intermediate, 1-[(2′-cyanobiphenyl-4-yl)methyl]-2-n-butyl-4-spirocyclopentane-2-imidazolin-5-one, substantially free of 1-[(2′-cyanobiphenyl-4-yl)methyl]-2-n-propyl-4-spirocyclopentane-2-imidazolin-5-one impurity, thereby producing irbesartan substantially free of the undesired propyl analog impurity, namely 2-propyl-3-[[2′-(1H-tetrazol-5-yl)[1,1′-biphenyl]-4-yl]methyl]-1,3 -diazaspiro[4.4]non-1-en-4-one. The present invention also provides a process for preparation of irbesartan substantially free of tin content. The present invention further provides a commercially viable process for preparation of irbesartan in high purity and in high yield.
本发明提供了一种改进且商业上可行的过程,用于制备缬沙坦中间体,1-[(2′-氰基联苯-4-基)甲基]-2-正丁基-4-螺环戊二烯-2-咪唑啉-5-酮,基本上不含1-[(2′-氰基联苯-4-基)甲基]-2-正丙基-4-螺环戊二烯-2-咪唑啉-5-酮杂质,从而生产基本上不含不需要的正丙基类似物杂质的缬沙坦,即2-正丙基-3-[[2′-(1H-四唑-5-基)[1,1′-联苯]-4-基]甲基]-1,3-二氮杂螺[4.4]壬-1-烯-4-酮。本发明还提供了一种制备基本上不含锡含量的缬沙坦的过程。本发明进一步提供了一种商业上可行的高纯度和高产率的缬沙坦制备过程。