Dimethylformamide → (R)-N'-(8-methyl-5-(4-nitrophenyl)-8,9-dihydro-7H-1,3-dioxolo[4,5-h][2,3]benzodiazepin-7-carbothioyl)-acetic hydrazide

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To a solution of 4.04 g (10.0 mmol) of the starting material XII, 3 ml of dimethylformamide, 1.40 ml (10.0 mmol) of triethylamine and 0.06 g (0.5 mmol) of 4-dimethylaminopyridine 1.48 g (20.0 mmol) of acetic hydrazide was added. The reaction mixture was stirred at 50° C. for 5 h, then diluted with water, the precipitated crystals were filtered off and washed with water. The so obtained 4.5 g of (R)—N′-{8-methyl-5-(4-nitrophenyl)-8,9-dihydro-7H-1,3-dioxolo[4,5-h][2,3]benzodiazepine-7-carbothioyl}-acetic hydrazide according to its 1H-NMR spectrum was a mixture of rotation isomers. (The analyzed sample was purified by column chromatography using a mixture of n-hexane-ethyl acetate (1:1) as eluent and it was crystallized with 0.5 mol of ethyl acetate, Mp.: 118° C.).

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