Process and intermediates for the preparation of penem derivatives
申请人:Pfizer Inc.
公开号:US04619783A1
公开(公告)日:1986-10-28
Certain substituted-2-penem-3-carboxylic acid compounds, and pharmaceutically-acceptable salts thereof, can be prepared from the appropriate xanthate or trithiocarbonate by desulfurization, followed by halogenation and ring closure. The corresponding desulfurized and halogenated intermediates are disclosed.