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E-mail: dr.jdsau@gmail.comReceived November 22, 2012, Accepted January 9, 2013Herein is reported a simple and efficient synthesis of isoflavones starting from various substituted phenacylbromides and salicylaldehydes in presence of NHC. The mechanism involved domino catalysis type approachwith consumption and regeneration of catalyst in two catalytic cycles. This method proved to be very lucrativeand gives very good yield. The method described here represents an environmentally benign alternative toclassical approach.Key Words : Umpolung, Heterocycles, Thiamine ( N-Heterocyclic carbene), Domino catalysis, Natural Prod-uctsIntroductionOne of the major issues of modern chemistry is thedevelopment of efficient methodologies for the synthesis ofbioactive compounds including natural products and theiranalogues.

Novel Synthesis of 3-Phenyl-chromen-4-ones Using N-Heterocyclic Carbene as Organocatalyst: An Efficient Domino Catalysis Type Approach