Potassium Carbonate → 4-(3-Bromopropionyl)-1,3-dimethyl-1,4,9,10-tetrahydropyrrolo[3,2-b][1,5]benzodiazepin-10-one

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A solution of 3.42 g of 3-bromopropionyl chloride in 20 ml of dioxane is added dropwise to 4.54 g of 1,3-dimethyl-1,4,9,10-tetrahydropyrrolo[3,2-b][1,5]benzodiazepin-10-one, 5.0 g of powdered anhydrous potassium carbonate and 80 ml of dry dioxane in the course of 10 minutes at from 50° to 60° C., and the mixture is stirred at this temperature for a further 2 hours. The solvent is stripped off in vacuo, and the resulting solid residue is stirred with 300 ml of ice water and filtered off. 5.1 g of the title compound of m.p. 194° to 195° C. (D.) are obtained after recrystallization from isopropanol.

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