Process for 3-exomethylenecepham sulfoxide esters

Details Process for 3-exomethylenecepham sulfoxide esters Process for 3-exomethylenecepham sulfoxide esters

C - Chemistry, Metallurgy

07

D

C07D 501/02 (2006.01) C07D 501/00 (2006.01) C07D 501/14 (2006.01) C07F 7/10 (2006.01)

Patent

CA 2058687

Abstract X-8289 3-Exomethylenecepham sulfoxide esters are obtained in improved yields via cyclization of 3-methyl- 2-(4-chlorosulfinyl-2-oxo-3-amino-1-azetidinyl)-3- butenoic acid esters under anhydrous conditions with a Lewis acid-type Friedel-Crafts catalyst in the presence of a nitro compound, e.g., nitromethane, nitroethane, nitropropane or nitrobenzene.

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