反应详情

温度

35 °C

To a suspension of benzhydryl 7-[2-(6-formamidopyridin-2-yl)-2-tert-butoxycarbonylmethoxyiminoacetamido]-3-vinyl-3-cephem-4-carboxylate (syn isomer) (4.8 g) in methanol (300 ml) was added conc. hydrochloric acid (2.88 ml), and the mixture was stirred at 35° C. for an hour. The reaction mixture was adjusted to pH 5.5 with 5% aqueous sodium bicarbonate, and the methanol was removed by distillation under reduced pressure, followed by extraction with ethyl acetate (300 ml). The extract was washed with a saturated aqueous sodium chloride and then dried over magnesium sulfate. Removal of the solvent gave benzhydryl 7-[2-(6-aminopyridin-2-yl)-2-tert-butoxycarbonylmethoxyiminoacetamido]-3-vinyl-3-cephem-4-carboxylate (syn isomer) (4.5 g), mp 125°-129° C.

1. customthe methanol was removed by distillation under reduced pressure
2. extractionfollowed by extraction with ethyl acetate (300 ml)
3. washThe extract was washed with a saturated aqueous sodium chloride
4. dry with materialdried over magnesium sulfate
5. customRemoval of the solvent