Reaction of 2-(2-Oxo-1,2-dihydro-3H-pyrrol-3-ylidene)- malononitriles with C-Nucleophiles. Synthesis of New Spiro-Fused Pyrrole Derivatives

Resumo

Base-catalyzed nucleophilic addition of carbon nucleophiles to the exocyclic double bond of 2-(5-aryl-4-methyl-2-oxo-1,2-dihydro-3H-pyrrol-3-ylidene)malononitriles afforded spiro-fused pyrrole derivatives, 7-amino-3-aryl-4-methyl-1-oxo-8-oxa-2-azaspiro[4.5]deca-3,6,9-triene-6-carbonitriles. The products can be regarded as rare structural analogs of biologically active spirans based on isatin.