The present invention provides an improved process for the preparation of Venlafaxine and the intermediates thereof. The present invention provides a process for preparing compound of formula (IV), an intermediate for preparing Venlafaxine by hydrogenating a compound of formula (III): in the presence of toluene, water, and Raney nickel as catalyst with the process yield of 66% formula (IV) with 99% HPLC purity. The compound of formula (III) is prepared by drop wise addition of p-methoxyphenyl acetonitrile as a solution in tetrahydrofuran to the solution of butyl lithium in hexane the said process yields 89% of compound of formula (III) with 99.8% purity.
本发明提供了一种改进的
文拉法辛及其中间体的制备方法。本发明提供了一种制备化合物IV的方法,该化合物是制备
文拉法辛的中间体,通过在
甲苯、
水和雷尼
镍作为催化剂的存在下,将化合物III氢化而得,该过程的产率为66%,化合物IV的HPLC纯度为99%。化合物III是通过将
对甲氧基苯乙腈作为
四氢呋喃溶液滴加到己烷中丁基
锂的溶液中制备的,该过程产率为89%,化合物III的纯度为99.8%。