反应详情

Aluminum chloride (2.66 g.) was added under ice-cooling to a solution of 2,2,2-trichloroethyl 2-methyl-2,3-methylene-6-(2-phenylacetamido)penam-3-carboxylate (9.2 g.) in dried dichloromethane (100 ml.) and the mixture was stirred for 7 hours at room temperature. After the reaction, the reaction mixture was washed in turn with 2% hydrochloric acid three times, a saturated sodium bicarbonate aqueous solution and a saturated sodium chloride aqueous solution and then dried over magnesium sulfate. After drying, the solvent was distilled off and the residue was purified by column chromatography on silica gel (200 g.) using chloroform as developing solvent to give 2,2,2-trichloroethyl 2-methyl-7-(2-phenylacetamido)-3-cephem-4-carboxylate (2.4 g.), mp 175° to 178° C.

1. customAfter the reaction
2. washthe reaction mixture was washed in turn with 2% hydrochloric acid three times
3. dry with materiala saturated sodium bicarbonate aqueous solution and a saturated sodium chloride aqueous solution and then dried over magnesium sulfate
4. customAfter drying
5. distillationthe solvent was distilled off
6. customthe residue was purified by column chromatography on silica gel (200 g.)