Ring-closure method for 1-carbacephalosporin six-membered ring

Details Ring-closure method for 1-carbacephalosporin six-membered ring Ring-closure method for 1-carbacephalosporin six-membered ring

C - Chemistry, Metallurgy

07

D

C07D 471/04 (2006.01) C07D 405/06 (2006.01) C07D 463/00 (2006.01) C07F 7/10 (2006.01) C07F 9/6558 (2006.01)

Patent

CA 2066493

X-83276 Abstract The invention provides a process for preparing 7-protected amino- 4-protected carboxy-1-carbacephalosporins which includes subjecting a 3- protected-amino-4-(1-propylene oxide)-methyl(protected carboxy)-azetidin-2- one to a strong base to form a 2-hydroxycepham and thereafter dehydrating the 2-hydroxycepham to form the desired 1-carbacephalosporin. Also included in the invention are novel intermediates.

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