Cyclization to form cephem ring and intermediates therefor

Details Cyclization to form cephem ring and intermediates therefor Cyclization to form cephem ring and intermediates therefor

C - Chemistry, Metallurgy

07

D

260/242, 260/300

C07D 205/08 (2006.01) C07D 205/095 (2006.01) C07D 513/04 (2006.01)

Patent

CA 1136132

ABSTRACT An intermediate represented by following formula for synthe- sizing 3-hydroxy-3-cephem compounds. Image or Image wherein A and B each is a hydrogen or amino substituent: R is a hydrogen or thiol substituent; Hal is a halogen; X is a hydroxy or carboxy protecting group; the broken line between A and R shows that when R and B are hydrogens. and A is a carboxylic acyl. the substituents can be combined to form an azetidinothiazoline bicy- clic ring: and the enamine derivatives thereof.

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