反应详情

To a solution of 7β-[2-(2-carbobenzoxyamino-5-fluoro-4-thiazolyl)-2-hydroxyiminoacetamido]-3-cephem-4-carboxylic acid diphenylmethyl ester (180 mg) in dichloromethane (3 ml) is added a solution of diazomethane in ether until yellow color of the solution does no more fade out. After 30 minutes, the reaction mixture is concentrated to give 7β-[2-(2-carbobenzoxyamino-5-fluoro-4-thiazolyl)-2-methoxyiminoacetamido]-3-cephem-4-carboxylic acid diphenylmethyl ester (153 mg). Similarly prepared are compounds of Table 1.

1. concentrationthe reaction mixture is concentrated