m-Chloroperbenzoic acid → Benzhydryl 7-[2-(2-tritylaminothiazol-4-yl)-2-difluoromethoxyiminoacetamido]-3-chloromethyl-3-cephem-4-carboxylate-1-oxide

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Reaction Steps

A mixture of benzhydryl 7-[2-(2-tritylaminothiazol-4-yl)-2-difluoromethoxyiminoacetamido]-3-chloromethyl-3-cephem-4-carboxylate (syn isomer) (35 g), m-chloroperbenzoic acid (8.64 g) and ethyl acetate (300 ml) was stirred for 30 minutes at 0° to 5° C. and then, water (300 ml), sodium bisulfite and sodium bicarbonate were added thereto. The organic layer was separated, washed with an aqueous solution of sodium chloride, dried over magnesium sulfate and evaporated. The residue was triturated with diisopropyl ether to give benzhydryl 7-[2-(2-tritylaminothiazol-4-yl)-2-difluoromethoxyiminoacetamido]-3-chloromethyl-3-cephem-4-carboxylate-1-oxide (syn isomer) (29.93 g).

Provenance & Evidence