反应详情

温度

10 °C

To a suspension of p-nitrobenzyl 7-phenylacetamido-3-cephem-4-carboxylate (10.50 g.) in dry dichloromethane (100 ml.) was added dry pyridine (2.14 g.). Phosphorus pentachloride (5.50 g.) was added to the solution at -10° C., and the mixture was stirred at -5° C. for 45 minutes and further at 10° C. for an hour. After adding methanol (520 g.) to the resultant mixture, the mixture was stirred at -20° C. for 1.5 hours. The precipitates were collected by filtration, washed with dichloromethane (120 ml.) and diethyl ether (130 ml.) in turn, and then dried to give p-nitrobenzyl 7-amino-3-cephem-4-carboxylate (7.90 g.), m.p. 182° C. (dec.).

1. stirringthe mixture was stirred at -20° C. for 1.5 hours
2. filtrationThe precipitates were collected by filtration
3. washwashed with dichloromethane (120 ml.) and diethyl ether (130 ml.) in turn
4. customdried