Abstract
Some spiro indolone derivatives 5a,b and 6 were synthesized through one-pot synthesis via the ternary condensation of 1H-indole-2,3-dione 1, 3-methyl-1-phenyl-2-pyrazolin-5-one 2 and active methylenes, namely malononitrile, ethyl cyanoacetate 4a,b and pyrazolone 2, respectively. The same derivatives can be obtained via other methods, through reactions of 3-[3-methyl-5-oxo-1-phenyl-1,5-dihydro-pyrazol-(4Z)-ylidene]-1,3-dihydro-indol-2-one 3 with the corresponding active methylenes. Reaction of 3 with amines and with ethyl vinyl ether was studied.
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