REACTION OF ISATINS WITH ACTIVE METHYLENE COMPOUNDS ON NEUTRAL ALUMINA: FORMATION OF KNOEVENAGEL CONDENSATES AND OTHER INTERESTING PRODUCTS
Abstract
Isatin and its N-methyl and 5-nitro derivatives underwent smooth reaction with a variety of acyclic and cyclic active methylene compounds on neutral alumina at rt to efficiently furnish Knoevenagel condensates in the majority of the cases and tandem Knoevenagel condensation-Michael addition products including spiro compounds in two cases.
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