Process for removing sulfonyl groups from benzimidazole isomers
    4.
    发明授权
    Process for removing sulfonyl groups from benzimidazole isomers 失效
    从苯并咪唑异构体中除去磺酰基的方法

    公开(公告)号:US4463181A

    公开(公告)日:1984-07-31

    申请号:US477476

    申请日:1983-03-21

    IPC分类号: C07D235/30

    CPC分类号: C07D235/30

    摘要: This invention discloses a process for removing a sulfonyl group from the 1-position of a benzimidazole to allow conversion of 2-amino-1,5-substituted-benzimidazole compounds into 2-amino-1,6-substituted-benzimidazole compounds. The 5-isomer is reacted with an alkali metal hydroxide or carbonate in an inert aqueous organic solvent system. The reaction is acidified to precipitate the base and form the intermediate benzimidazole tautomer. The intermediate is then reacted with a sulfonyl acylating agent or a haloalkyl isothiocyanate to form a mixture of 2-amino-1,5(6)-substituted-benzimidazole compounds. This invention also discloses the same process for removing a sulfonyl group from the 1-position of a benzimidazole to allow conversion of 2-amino-1,6-substituted-benzimidazole compounds into 2-amino-1,5-substituted-benzimidazole compounds.

    摘要翻译: 本发明公开了一种从苯并咪唑的1-位除去磺酰基以使2-氨基-1,5-取代的苯并咪唑化合物转化为2-氨基-1,6-取代的苯并咪唑化合物的方法。 5-异构体与碱金属氢氧化物或碳酸酯在惰性水性有机溶剂体系中反应。 将反应物酸化以沉淀碱并形成中间体苯并咪唑互变异构体。 然后将中间体与磺酰基酰化剂或异硫氰酸卤代烷基酯反应形成2-氨基-1,5(6) - 取代 - 苯并咪唑化合物的混合物。 本发明还公开了从苯并咪唑的1位除去磺酰基以允许2-氨基-1,6-取代的苯并咪唑化合物转化为2-氨基-1,5-取代的苯并咪唑化合物的相同方法。