Sodium Carbonate → (S)-8-bromo-9-oxo-12,12a-dihydro-9H,11H-azeto[2,1-c]imidazo[1,5-a][1,4]benzodiazepine-1-carboxamidoxime

Participants

Reaction Steps

13 g (39.5 mmol) of (S)-8-bromo-9-oxo-12,12a-dihydro-9H,11H-azeto[2,1-c]imidazo[1,5-a][1,4]benzodiazepine-1-carbonitrile were stirred with 7.5 g (71 mmol) of sodium carbonate and 5.7 g (82 mmol) of hydroxylamine hydrochloride in 200 ml of ethanol and 40 ml of water at 50° for 1 hour and at 75° for 10 minutes. After dilution with 50 ml of water the suspension was suction filtered, whereupon the crystals were dried. There were obtained 7.33 g (51%) of (S)-8-bromo-9-oxo-12,12a-dihydro-9H,11H-azeto[2,1-c]imidazo[1,5-a][1,4]benzodiazepine-1-carboxamidoxime of m.p. 265°-266°.

Provenance & Evidence