Hydroxylamine → (S)-8-chloro-11,12,13,13a-tetrahydro-9-oxo-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepine-1-carboxamidoxime

Participants

Reaction Steps

7.0 g (23.4 mmol) of (S)-8-chloro-11,12,13,13a-tetrahydro-9-oxo-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepine-1-carbonitrile are stirred at boiling temperature for 1.5 hours together with about 1.0 g of freshly prepared hydroxylamine in 90 ml of ethanol. By cooling, filtering off the precipitated material, washing with ether and drying there is obtained (S)-8-chloro-11,12,13,13a-tetrahydro-9-oxo-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepine-1-carboxamidoxime of melting point 249°-250°. By chromatography of the residue from the mother liquor on silica gel and subsequent crystallization from ethyl acetate there is obtained a second portion of the desired amidoxime.

Provenance & Evidence