反应详情

A mixture of 7-[2-(2-formamido-5-chlorothiazol-4-yl)-2-tert-butoxycarbonylmethoxyiminoacetamido]-3-(1,3,4-thiadiazol-2-yl)thiomethyl-3-cephem-4-carboxylic acid (syn isomer) (3.6 g) in methanol (36 ml) and conc. hydrochloric acid (1.1 g) was stirred for 3.0 hours at ambient temperature. The reaction mixture was added to water and ethyl acetate, and adjusted to pH 7.5 with a saturated aqueous solution of sodium bicarbonate. The aqueous layer was separated and adjusted to pH 3.0 with 10% aqueous hydrochloric acid, and then extracted with ethyl acetate. The extract was washed with a saturated aqueous solution of sodium chloride, dried over magnesium sulfate, and evaporated to give 7-[2-(2-amino-5-chlorothiazol-4-yl)-2-tert-butoxycarbonylmethoxyiminoacetamido]-3-(1,3,4-thiadiazol-2-yl)thiomethyl-3-cephem-4-carboxylic acid (syn isomer) (2.62 g).

1. customThe aqueous layer was separated
2. extractionextracted with ethyl acetate
3. washThe extract was washed with a saturated aqueous solution of sodium chloride
4. dry with materialdried over magnesium sulfate
5. customevaporated