Ammonia → 6-(2-chlorophenyl)-1,8-dichloro-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxamide

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Reaction Steps

A mixture of 0.5 g (0.0012 mole) of 6-(2-chlorophenyl)-1,8-dichloro-4H-imidazo[1,5-a] [1,4]benzodiazepine-3-carboxylic acid methyl ester and 20 ml of a 20% solution of ammonia in methanol was heated at 120°-125° in a steel bomb for 18 hrs. Evaporation of the solvent at reduced pressure gave an amorphous solid. The solid was dissolved in methylene chloride, washed with water, dried and evaporated at reduced pressure to give a tan, amorphous solid which crystallized when stirred with a small amount of boiling ether. Recrystallization from a solution of methanol and methylene chloride gave white crystals with mp 285°-288°. Uv λ 214 mμ (ε=44,300) sh 245 (26,500) sh 260 (16,400) sh 300 (600); ir (KBr) 3470, 3335 cm-1 (NH2) 1670 (CON).

Provenance & Evidence