Allylic chlorination process and compounds prepared thereby

C - Chemistry – Metallurgy – 07 – D

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260/298.2

C07D 513/04 (2006.01)

Patent

CA 1145339

X-5055-Canada Abstract of the Disclosure This invention provides a process for the preparation of novel thiazolinoazetidinone compounds of the formula Image wherein R is hydrogen, methoxy, C1-C2 alkoxycarbonyl, C1-C8 alkyl, C1-C8 alkyl monosubstituted with protected hydroxy, C1-C3 alkoxy or cyano, C2-C8 alkenyl, C2-C8 alkenyl monosubstituted with protected hydroxy, C1-C3 alkoxy or cyano, C3-C8 cycloalkyl, C3-C8 cycloalkyl substituted with protected hydroxy, C1-C3 alkoxy or cyano, X-5055-Canada Image Image OR Image ; R2 is hydrogen, protected hydroxy, chloro, bromo, C1-C3 alkyl, C1-C3 alkoxy, nitro or cyano; Y is oxygen or a carbon-carbon bond; R3 is projected hydroxy, C1-C4 alkyl or protected amino; m is 0-2; n is 0-2; R1 is a carboxylic acid protecting group; and the 1- and 5-position C-H bonds in the thiazolinoazetidinone are in the .alpha.-position. These compounds are intermediates for the preparation of cephalosporins.

350602

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