Hydrazine → 10,11-dihydro-10(4-aminobenzoyl)-5H-pyrrolo[2,1-c][1,4]benzodiazepine

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To a solution of 21.58 g of 10,11-dihydro-10-(4-nitrobenzoyl)-5H-pyrrolo[2,1-c][1,4]benzodiazepine in 325 ml of ethyl alcohol is added 2.15 g of 10% Pd/C and 5.16 g of hydrazine followed by stirring and heating under reflux for 15 hours. The room temperature reaction mixture is filtered through diatomaceous earth. The filtrate is concentrated in vacuo to a solid which is dissolved in methylene chloride and passed through a pad of hydrous magnesium silicate. The filtrate is concentrated in vacuo to give 19.2 g of the desired product as a tan solid. The solid is purified by flash chromatography using 7:1 ethyl acetate-hexane to give 17.97 g of the desired product, m.p. 166°-168° C.

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