Hydrazine hydrate (1:1) → 7-chloro-5-methyl-6-oxo-5,6-dihydro-4H-imidazo[1,5-a][1,4]benzodiazepin-3-carboxylic acid hydrazide

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Reaction Steps

50 g (156.4 mmol) of ethyl 7-chloro-5-methyl-6-oxo-5,6-dihydro-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylate were stirred at boiling temperature for 6 hours with 90 ml (1.85 mol) of hydrazine hydrate in 500 ml of ethanol. By cooling to -10°, filtering the suspension under suction and drying the crystallizate there were obtained 51.9 g (100%) of 7-chloro-5-methyl-6-oxo-5,6-dihydro-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylic acid hydrazide of m.p. 287°.

Provenance & Evidence