申请人:Dishman Pharmaceuticals & Chemicals Ltd.
公开号:EP1721889A1
公开(公告)日:2006-11-15
The present invention relates to a process of preparing venlafaxine and derivatives thereof comprising reducing the corresponding β-hydroxynitriles using a reducing borohydride agent selected from tetraalkylammonium borohydride and aralkyltrialkylammonium borohydride. According to the present process, said β-hydroxynitrile can be prepared by condensating a phenylacetonitrile and cyclohexanone using a phase transfer catalyst and a base at a temperature of between 10-25 °C. Advantageously, in the present method, the use of hazardous catalysts and reducing agents is avoided and unexpectedly low amounts of reducing borohydride agent can be used.
本发明涉及一种制备文拉法辛及其衍生物的过程,包括使用从四烷基铵硼氢化物和芳基三烷基铵硼氢化物中选择的还原硼氢化剂还原相应的β-羟基腈。根据本方法,所述的β-羟基腈可以通过在10-25°C温度下使用相转移催化剂和碱使苯乙腈和环己酮缩合而制备。在本方法中,避免使用危险催化剂和还原剂,并且可以意外地使用较少量的还原硼氢化剂,具有明显优势。