2-thiacephems

Details 2-thiacephems 2-thiacephems

C - Chemistry, Metallurgy

07

D

260/243

C07D 513/04 (2006.01) C07D 205/09 (2006.01) C07D 417/12 (2006.01) C07D 499/88 (2006.01) C07F 7/10 (2006.01) C07F 7/18 (2006.01)

Patent

CA 1254891

Processes for the preparation of a 2-thiacephem derivative of the general formula II: (see formula I) wherein R1 represents a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or a cycloalkyl group having 4 to 7 carbon atoms, said alkyl and cyclalkyl groups optionally substituted by hydroxy, protected hydroxy, amino, protected amino, mercapto, protected mercapto, or cyano; R2 represents a hydrogen atom or a carboxy protecting group and Y represents a hydrogen atom or a halogen atom. The processes are characterized as commencing with a compound of the general formula IV: (see formula II) compounds of formula II are useful intermediates in the preparation of (5R) penem compounds useful as pharmaceuticals.

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