Hydroxyamine hydrochloride → (S)-8-chloro-7-fluoro-12,12a-dihydro-9-oxo-9H,11H-azeto[2,1-c]imidazo[1,5-a][1,4]benzodiazepine-1-carboxamidoxime

Participants

Reaction Steps

3.1 g (134.8 mmol) of sodium were dissolved in 140 ml of methanol. 10 g (145 mmol) of hydroxylamine hydrochloride and 28.6 g (94.5 mmol) of (S)-8-chloro-7-fluoro-12,12a-dihydro-9-oxo-9H,11H-azeto[2,1-c]imidazo[1,5-a][1,4]benzodiazepine-1-carbonitrile were added in succession at room temperature. The suspension was stirred at room temperature overnight, cooled to 0° during 30 min., the crystals were filtered off, suspended in 50 ml of water and filtered off. The methanol solution was concentrated, whereupon the residue was suspended in 30 ml of water and the crystals were filtered off. By drying the combined crystallizate there were obtained 30.94 g (97%) of (S)-8-chloro-7-fluoro-12,12a-dihydro-9-oxo-9H,11H-azeto[2,1-c]imidazo[1,5-a][1,4]benzodiazepine-1-carboxamidoxime of m.p. 236°-238°.

Provenance & Evidence