Substituted 2,3,5,6,7,8-hexahydropyrazolo4,3-
d1,2diazepine-8-carboxylates were prepared in good to excellent yields from ethyl (2
E)-3-(dimethylamino)-2-{(4
...Z)-4-(dimethylamino)methylidene-5-oxo-1-phenyl-4,5-dihydro-1
H-pyrazol-3-yl}propenoate with 1,2-disubstituted hydrazines by heating in an alcohol.
Substituted 2,3,5,6,7,8-hexahydropyrazolo4,3-
d1,2diazepine-8-carboxylates were obtained from ethyl (2
E)-3-(dimethylamino)-2-{(4
Z)-4-(dimethylamino)-methylidene-5-oxo-1-phenyl-4,5-dihydro-1
H-pyrazol-3-yl}propenoate, via substitution of both dimethylamino groups with 1,2-dialkylhydrazines.
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