反应详情

A solution of 3-chloroperbenzoic acid (0.44 g.) in chloroform (5 ml.) was dropwise added under ice-cooling to a solution of 2,2,2-trichloroethyl 2-methyl-7-(2-phenylacetamido)-3-cephem-4-carboxylate (0.92 g.) in chloroform (10 ml.) and the mixture was stirred for 1.5 hours at the same temperature. After the reaction, the precipitating crystals were filtered off and the filtrate was washed in turn with a sodium bicarbonate aqueous solution and a saturated sodium chloride aqueous solution, followed by drying over magnesium sulfate, and then the solvent was distilled off. The residue was crystallized using a small amount of ether to give 2,2,2-trichloroethyl 2-methyl-7-(2-phenylacetamido)-3-cephem-4-carboxylate-1-oxide, mp 173° to 175° C.

1. customAfter the reaction
2. filtrationthe precipitating crystals were filtered off
3. washthe filtrate was washed in turn with a sodium bicarbonate aqueous solution
4. dry with materialby drying over magnesium sulfate
5. distillationthe solvent was distilled off
6. customThe residue was crystallized