反应详情

To a solution of 2 parts of 7-chloro-2-methylmercapto-5-phenyl-3H-1,4-benzodiazepine in 70 parts by volume of ethanol is added 5 parts by volume of 80% hydrazine hydrate and the mixture is allowed to stand at room temperature for 3 days. After evaporation of the solvent, a small amount of water is added to the residue, whereby 7-chloro-2-hydrazino-5-phenyl-3H-1,4-benzodiazepine is obtained as crystals. Recrystallization from a mixture of methylene chloride and benzene gives crystals. Melting point; 175° C (browning), 205° C to 207° C (decomposition).

1. customAfter evaporation of the solvent
2. additiona small amount of water is added to the residue