申请人:PFIZER INC.
公开号:EP0156644A1
公开(公告)日:1985-10-02
This invention provides a two-step process for the preparation of 4-acetylimidazoles. In the first step, a 4-acylamino-5-methylisoxazole is subjected to catalytic hydrogenolysis to give a 4-amino-3-acyl-amino-3-buten-2-one. In the second step, the intermediate 3-buten-2-one compound is cyclized to a 4-acetylimidazole by treatment with a basic agent. The 4-acetylimidazoles are chemical intermediates for preparing known antisecretory agents and histamine H2 antagonists, useful for the treatment of gastric hyperacidity and peptic ulcers.
本发明提供了一种分两步制备
4-乙酰基咪唑的工艺。第一步,将 4-乙酰
氨基-
5-甲基异噁唑进行催化氢解,得到 4-
氨基-3-乙酰
氨基-3-
丁烯-2-酮。在第二步中,中间体 3-
丁烯-2-酮化合物通过碱性物质环化为
4-乙酰基咪唑。4- 乙酰基
咪唑是制备已知抗分泌剂和
组胺 H2 拮抗剂的
化学中间体,可用于治疗胃酸过多和消化性溃疡。