Water → 3-bromo-4,5-dihydro-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one

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Reaction Steps

20 g (93.8 mmol) of 4,5-dihydro-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepin-6 -one in 100 ml of dimethylformamide are treated with 17.5 g (98 mmol) of N-bromosuccinimide and stirred at room temperature for 35 minutes. The solution is poured into water and extracted twice with chloroform. The chloroform extracts are washed several times with water, dried over magnesium sulphate and evaporated. After recrystallization from ethyl acetate, the residue yields 3-bromo-4,5-dihydro-5-methyl-6H-imidazo[1,5-a][1,4]benzodiazepin-6-one of melting point 196°-198°.

Provenance & Evidence