Click and facile access of substituted tetrahydro-4H-chromenes using 2-aminopyridine as a catalyst

摘要

A highly convenient and greener method for the facile synthesis of pharmaceutically diverse 2-amino-5-oxo-4-aryl-5,6,7,8-tetrahydro-4H-chromene-3-carbonitriles via a one-pot, three component condensation of aromatic aldehydes, malononitrile, and 1,3-cyclohexanedione or dimedone using 2-aminopyridine as an efficient alkaline organo catalyst is described. This new chemistry furnishes the desired heterocycles in very shorter reaction times with higher purity and has the advantages of economic viability, ease of preparation, excellent yields, and recyclability of catalyst.