8-chloro-6-(2-chlorophenyl)-2-methyl-4H-imidazo[1,2-a][1,4]benzodiazepine-1-carboxaldehyde → HCID 21680191, compound

Participants

Reaction Steps

A mixture of 1.0 g. of 8-chloro-6-(2-chlorophenyl)-4H-imidazo[1,2-a][1,4]benzodiazepine-1-carboxaldehyde (II) and 0.1 g. of tris(triphenylphosphine)rhodium chloride in 50 ml. of benzene is refluxed for about 6 hours. The mixture is then allowed to cool and filtered to remove the catalyst. The fitrate thus obtained is concentrated in vacuo to give 8-chloro-6-(2-chlorophenyl)-4H-imidazo[1,2-a][1,4]benzodiazepine, which is further purified by chromatography on silica gel and/or crystallization, m.p. 179°-180° C.

Provenance & Evidence