Ammonia → 1,3-dihydro-7-hydroxyamino-1-methyl-5-phenyl-2H-1,4-benzodiazepin-2-one

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A mixture of 15 g. (0.05 mol) of 1,3-dihydro-1-methyl-7-nitro-5-phenyl-2H-1,4-benzodiazepin-2-one, 250 ml. of tetrahydrofuran, 250 ml. of methanol, 56 g. of stannous chloride dihydrate and 68 g. of sodium acetate trihydrate was stirred under nitrogen for 3 hours. 1 l. of methylene chloride and 15 ml. of concentrated ammonia was added. The inorganic material was separated by filtration over celite. The filtrate was washed with 1N sodium hydroxide solution, was dried over sodium sulfate and evaporated. Crystallization of the residue from methylene chloride and recrystallization from ethanol/methylene chloride yielded light yellow product with m.p. 211°-213°.

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