Stereoselective synthesis of indenone-fused heterocyclic compounds via a one-pot four-component reaction

A one-pot multi-component synthesis of indenone-fused heterocyclic derivatives from readily available starting materials including diamines, 1,1-bis(methylthio)-2-nitroethene, 1,3-indandione and aromatic aldehydes in excellent yields is described. The sequence of cascade reactions include Knoevenagel condensation, enamine formation, Michael addition, imine-enamine tautomerization and cyclization. The diastereoselective synthesis of cis-indenohydropyridine have been definitively proven by X-ray crystallography.

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