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

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Reaction Steps

40 g (124 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-carboxylic acid were suspended in 190 ml of N,N-dimethylformamide and treated portionwise at room temperature with 21 g (129.5 mmol) of 1,1'-carbonyldiimidazole. After completion of the CO2 evolution the clear brown solution was stirred at 50° for 30 min., cooled and treated dropwise with 30 ml of conc. ammonia at a temperature below 25° within about 10 min. After stirring for 30 minutes the suspension obtained was poured into 700 ml of ice-water, stirred at room temperature for 30 min. and filtered, whereupon the crystals were rinsed with a small amount of water. After drying there were obtained 31.36 g (78%) 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-carboxamide of m.p. 296°-298°.

Provenance & Evidence