Triethylamine → N-(2,3-Dimethylphenyl)-4-(5H-pyrrolo[2,1-c][1,4]-benzodiazepin-10(11H)-ylcarbonyl)benzamide

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A mixture of 0.332 g of 4-(5H-pyrrolo[2,1-c][1,4]benzodiazepin-10(11H)-ylcarbonyl)benzoic acid, 0.222 g of triethylamine, 0.157 g of 2,3-dimethylaniline hydrochloride, 0.15 ml of diethylphosphoryl cyanide in 20 ml of dichloromethane is heated on a steam bath for 3 hours. The mixture is washed with H2O, 1M NaHCO3, H2O, 1N HCl, brine and dried (Na2SO4). The solution is filtered through a thin pad of hydrous magnesium silicate and the filter cake washed with dichloromethane. The filtrate is concentrated to dryness under vacuum and the residue crystallized from dichloromethane-hexane to give 0.11 g of crystals, m.p. 239°-240° C.

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