Synthesis of novel heterocycles through reaction of indolin-2-one derivatives with active methylene and amino reagents

Arch Pharm Res. 1997 Oct;20(5):507-9. doi: 10.1007/BF02973949.

Abstract

Several new spiro compounds were synthesized via one-pot ternary condensation of isatin, malononitrile and each of thiobarbituric acid, barbituric acid, 3-methyl-pyrazolin-5-one, 1-phenyl-3-methyl-pyrazolin-5-one, acetylacetone, benzoylacetone, ethyl acetoacetate, phenacyl cyanide or ethyl-cyanoacetate dimer. Structures and reaction mechanism were reported and supported via a second synthetic route.