申请人:Pfizer Inc.
公开号:US04595539A1
公开(公告)日:1986-06-17
Certain 2-substituted-2-penem-3-carboxylic acid compounds and pharmaceutically-acceptable salts thereof can be prepared from the appropriate xanthate or trithiocarbonate by desulfurization and addition of an electrophilic sulfur compound followed by halogenation and ring closure. The corresponding desulfurized and halogenated olefinic intermediates are disclosed.
某些2-取代-2-氧杂-3-羧酸化合物及其药用可接受的盐可以通过适当的硫代硫酸盐或三硫代碳酸酯经过脱硫、加入亲电子硫化合物,随后进行卤素化和环合反应来制备。相应的脱硫和卤素化的烯丙基中间体也被披露。