反应详情

To a solution of benzhydryl 7-salicylideneamino-3-vinyl-3-cephem-4-carboxylate (1.6 g) in methylene chloride (20 ml) and anisole (5 ml) was added dropwise trifluoroacetic acid (6 ml) with stirring, and the stirring was continued at ambient temperature for an hour. The reaction mixture was poured into diisopropyl ether, and the precipitates were collected by filtration and then suspended in water, followed by adjusting to pH 3.5 with a saturated aqueous sodium bicarbonate. The solid was collected by filtration to give 7-amino-3-vinyl-3-cephem-4-carboxylic acid (0.4 g).

1. waitthe stirring was continued at ambient temperature for an hour
2. filtrationthe precipitates were collected by filtration
3. filtrationThe solid was collected by filtration