Schiff bases [2-(1,5-Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4ylimino)-5,5-diethyl-dihydro-pyrimidine-4,6-dione and 2,6-Bis-(1,5 Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-ylimino)-5,5-diethyl-tetrahydro-pyrimidin-4one] were prepared by condensation of 5,5-Diethyl-pyrimidine-2,4,6-trione with one equivalent and tow equivalent of 4-Amino-1,5-dimethyl-2-phenyl-1,2-dihydropyrazol-3-one in ethanol (as solvent). These Schiff-base were reacted with one equivalent of maleic , succinic and malonic anhydride in absolute ethanol to give 7membered heterocyclic ring system 12(1,5-Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)-3,3-diethyl-7-oxa-1,5,12-triaza-spiro[5.6]dodecane-2,4,8,11tetraone. and 6-membered heterocyclic ring system of 5-(1,5-Dimethyl -3-oxo-2phenyl-2,3-dihydro-1H-pyrazol-4-yl)-9,9-diethyl-1-oxa-5,7,11-triazaspiro[5.5]undecane-2,4,8,10-tetraone.Than , the product were reacted with tow equivalent of maleic , succinic and malonic anhydride in same solvent give 2 (7membered) heterocyclic ring system of 8,15-Bis- (1,5-dimethyl-3-oxo-2-phenyl-2,3-