反应详情

A mixture of (R)-6-(4-aminophenyl)-5-methyl-4 5-dihydro-3(2H)-pyridazinone (100 mg), 4H-pyran-4-one (52 mg) and hydrochloric acid (0.1 N, 1 ml) in water (1,3 ml) was stirred under reflux under nitrogen for 3 hours. Aqueous ammonia (880, 0.01 ml) was added to the cooled reaction mixture to afford the title compound which was collected, washed with water and dried, 91 mg, m.p. 257-8° C. (softens 120° C.), [α]25D=- 369.5° (1.07% in dimethylformamide).

1. temperatureunder reflux under nitrogen for 3 hours