Water → HCID 53655027, compound

Participants

Reaction Steps

3 g (11 mmol) of (S)-7-chloro-11,12,13,13a-tetrahydro-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepin-9-one in 30 ml of dimethylformamide are stirred at 90° for 30 minutes with 1.60 g of N-chlorosuccinimide. The solution is poured into water and extracted with chloroform. The chloroform extracts are washed several times with water, dried over magnesium sulphate and evaporated. By chromatography on a silica gel column and subsequent recrystallization from ethyl acetate there is obtained (S)-1,7-dichloro-11,12,13,13a-tetrahydro-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepin-9-one of melting point 209°-210°.

Provenance & Evidence