Ethyl Acetate → HCID 178477300, compound

Participants

Reaction Steps

To a solution of 7β-[(Z)-2-(2-t-butoxycarbonylaminothiazol -4-yl)-2-trityloxyiminoacetylamino]-3-(1-methyl-1,2,4-triazol-3-ylthiomethylthio)-3-cephem-4-carboxylic acid diphenylmethyl ester 1-oxide (1.78 g : 1.69 mMol.) in dimethylformamide (15 ml) at -20° C. is added phosphorus trichloride (0.42 ml : 4.18 mMol.), and the mixture is stirred at the same temperature for 20 minutes. The reaction mixture is poured into two layers of cold aqueous sodium hydrogen carbonate and ethyl acetate. The organic layer is taken, washed with water and brine, dried over sodium sulfate, and concentrated. The residue is purified by silica gel chromatography (toluene : ethyl acetate=2: 1) to give 7β-[(Z)-2- (2-t-butoxycarbonylaminothiazol-4-yl) -2-trityloxyiminoacetamido]-3-(1- methyl-1,2,4-triazol-3-ylthiomethylthio) -3-cephem-4-carboxylic acid diphenylmethyl ester (1.59 g) as brown foam. Yield : 91%.

Provenance & Evidence