Synthesis of some new spiropyrazolo[4 ',5 ': 5,6]-pyrano[2, 3-d]pyrimidines

3-Methylpyrazolin-5-ones (1a,b) were reacted with cyclo-alkanones (2a d) in the presence of fused sodium acetate to give the corresponding cycloalkyli dene derivatives (3a-h). Reaction of compounds 3a-h with malononitrile gave the pyrano derivatives (4a-h), which were cyclized to pyranopyrimidines wi th acetic anhydride/pyridine, formamide and formamide/formic acid. All the synthesized spiroheterocycles derivatives were identified by conventional m ethods (IR,H-1 NMR) and elemental analyses.