Intermediate and processes for its preparation and conversion into a pharmacologically-active agent
申请人:Alembic Limited
公开号:US06756502B2
公开(公告)日:2004-06-29
Processes for the preparation of Venlafaxine (IX) via the novel epoxy-nitrile intermediate (I), which when subjected to hydrogenation forms compound (X), and may subsequently be reduced to yield the desired product (IX). The epoxy-nitrile intermediate (I) itself may be synthesized via various alternative reaction strategies, from a range of starting materials. E.g. 4-methoxy-benzaldehyde (VI), upon treatment with cyclohexyl magnesium bromide yields compound (V). This in turn may be oxidized to yield compound (III), which forms compound (II) on treatment with an (x-keto-halogenation agent. Cyanation of compound (II), then yields the desired epoxy nitrile intermediate (I), from which Venlafaxine (IX) may be synthesized.
使用新型环氧腈中间体(I)制备文拉法辛(IX)的工艺,当该中间体经过氢化反应形成化合物(X)后,可以进一步还原以产生所需的产物(IX)。环氧腈中间体(I)本身可以通过各种替代反应策略从一系列起始材料中合成。例如,4-甲氧基苯甲醛(VI)经过环己基溴化镁处理后产生化合物(V)。这反过来又可以被氧化成化合物(III),在与(x-酮卤代试剂)反应后形成化合物(II)。化合物(II)的氰化反应,然后产生所需的环氧腈中间体(I),从中可以合成文拉法辛(IX)。