.alpha.-protected...

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C - Chemistry, Metallurgy

07

D

260/525.1, 260/4

C07D 277/20 (2006.01) C07D 277/34 (2006.01) C07D 277/40 (2006.01) C07D 277/46 (2006.01) C07D 277/48 (2006.01)

Patent

CA 1128957

ABSTRACT OF THE DISCLOSURE Novel ?-protected oxyimio-.beta.-oxo-.gamma.-halogenobutyric acid derivatives of the formula; Image wherein x means a halogen and R5 is protected hydroxyl group, and salts and esters thereof, are useful intermediates for preparing ?-protected oxyimino- ?-(2-aminothiazol-r-yl)acetic acid derivatives which themselves are inter- mediates for certain antibiotic cephem compounds.

315025

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