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-青霉烷-3-
羧酸化合物及其药学上可接受的盐可以通过适当的黄原酸盐或
三硫代碳酸酯的脱
硫和电荷亲和性
硫化合物的加成,然后进行卤代和环闭来制备。相应的脱
硫和卤代烯烃中间体也被揭示。