O.NN.[N+:4]([C:7]1[CH:8]=[C:9]([C:13]2[CH:14]3[CH:16]([C:17](=[O:20])[NH:18][N:19]=2)[CH2:15]3)[CH:10]=[CH:11][CH:12]=1)([O-])=O>C(O)C.[Ni]>[NH2:4][C:7]1[CH:8]=[C:9]([C:13]2[CH:14]3[CH:16]([C:17](=[O:20])[NH:18][N:19]=2)[CH2:15]3)[CH:10]=[CH:11][CH:12]=1A solution of 0.65 g (13.0 millimoles) of hydrazine hydrate in 10 ml of ethanol is added, whilst stirring, to a mixture of 1.5 g (6.5 millimoles) of 2-(m-nitrophenyl)-3,4-diaza-bicyclo[4.1.0]hept-2-en-5-one (see Example 32b), 20 ml of ethanol and a small amount of an aqueous Raney nickel suspension in the course of 5 minutes, during which the temperature rises from 25° to 35° C. Stirring is continued for 1 hour and the reaction mixture is then slowly raised to the boil. It is refluxed for 5 minutes and filtered hot, and the filtrate is concentrated. After recrystallization from ethyl acetate/methanol, 1.0 g (76% of theory) of 2-(m-aminophenyl)-3,4-diaza-bicyclo[4.1.0]hept-2-en-5-one is obtained as colorless crystals, identical with the compound from Example 33.
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