Process for preparing 3-methylene cephalosporins

Details Process for preparing 3-methylene cephalosporins Process for preparing 3-methylene cephalosporins

C - Chemistry, Metallurgy

07

D

204/91.17

C07D 513/02 (2006.01) B01J 19/12 (2006.01) C07D 501/08 (2006.01) C07D 501/10 (2006.01) C07D 501/14 (2006.01) C07D 501/22 (2006.01) C07D 501/28 (2006.01) C07D 501/30 (2006.01)

Patent

CA 1062654

ABSTRACT Photolysis of azetidin-2-one derivatives having the formula Image wherein R1, is acyl, R2 is hydrogen or a-methoxy, R3 is hydrogen, alkyl, 2,2,2-trichloroethyl, trimethylsilyl, diphenylmethyl, benzyl, 4-methoxybenzyl, or 4-nitrobenzyl, and R4 is an aromatic heterocyclic group, yields 3-methylene cephalosporins.

271660

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