Triethylamine → (4-fluoro-2-bromophenyl)-(5H,11H-pyrrolo[2,1-c][1,4]benzodiazepin-10-yl)-methanone

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Reaction Steps

Step b) (4-Fluoro-2-bromophenyl)-(5H,11H-pyrrolo[2,1-c][1,4]benzo-diazepin-10-yl)-methanone: A solution of 4-fluoro-2-bromobenzoyl chloride (5.32 g) from step a), in dichloromethane (35 ml), was added dropwise to a solution of 10,11-dihydro-5H-pyrrolo[2,1-c][1,4]-benzodiazepine (3.44 g) and triethylamine (2.27 g) in dichloromethane (80 ml) and cooled in an ice bath. The cooling bath was removed and after stirring for 16 hours, the reaction mixture was washed sequentially with water, saturated aqueous sodium bicarbonate and saturated aqueous sodium chloride. The dichloromethane solution was dried over anhydrous magnesium sulfate, filtered and evaporated in vacuo to give a pale purple foam. Purification by flash chromatography on silica gel eluting with hexane-ethyl acetate (1:1) resulted in the intermediate (4-fluoro-2-bromophenyl)-(5H,11H-pyrrolo[2,1-c][1,4]benzodiazepin-10-yl)-methanone as a tan foam (6.91 g), MS m/z: 384 (M)+. This material was used without further purification in the next step.

Provenance & Evidence