Abstract
5,5-Dimethyl-2-[(2-substitutedphenylhydrazinyl)methylene]cyclohexane-1,3-dione, obtained from heating dimedone with N,N‘-dimethylformamide dimethyl acetal (DMF-DMA) and phenyl hydrazines, on cyclisation in ethanol gave 6,7-dihydro-1 H-indazol-4(5 H)-ones. The thiosemicarbazone derivative of 6,7-dihydro-1 H-indazole-4(5 H)-ones, on cyclocondensation with a and (3-haloacids in the presence of N,N‘-dicyclohexylcarbodiimide afforded new thiazolidin-4-ones and 1,3-thiazinan-4-ones respectively. Thiosemicarbazone of 6,7-dihydro-1 H-indazol-4(5 H)-ones on stirring with phenacyl bromides yields 2,4-disubstituted thiazoles. X-ray structure of the intermediate compound 5-dimethyl-2-[(2-phenylhydrazinyl)methylene] cyclohexane-1,3-dione was determined.
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