Process for the preparation of 3-exomethylenecepham derivatives

Details Process for the preparation of 3-exomethylenecepham derivatives Process for the preparation of 3-exomethylenecepham derivatives

C - Chemistry, Metallurgy

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C07D 501/04 (2006.01) A61K 31/545 (2006.01) C07D 501/00 (2006.01) C07D 501/14 (2006.01) C07D 501/18 (2006.01) C07D 501/24 (2006.01) C07D 501/40 (2006.01) C07F 9/28 (2006.01) C07F 9/54 (2006.01) C07F 9/547 (2006.01) C07F 9/6547 (2006.01) C07D 501/22 (2006.01)

Patent

CA 1338607

A process is provided for the preparation of 3- methylene and 3-halomethylene cepham derivatives via 3-phos- phoniomethyl-3-cephem derivatives, which in turn can be prepared from 3-halomethyl-3-cephem derivatives. The prepa- ration can be carried out with or without isolating the intermediate phosphonium cephem compounds. The 3-methylene and 3-halomethylene cepham derivatives and in particular the 1-oxo and 1,1-dioxo cepham compounds are also prepared by reducing a 3-halomethyl-3-cephem derivative with activated metal, preferably zinc or magnesium.

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