Highly efficient synthesis of benzopyranopyridines via ZxP2O7 nanoparticles catalyzed multicomponent reactions of salicylaldehydes with malononitrile and thiols

摘要

ZrP2O7 nanoparticles as an efficient catalyst have been used for the preparation of benzopyrano2,3-bpyridines from the four-component condensation reaction of salicylalde-hydes, thiols, and 2 equiv. of malononitrile under reflux conditions in ethanol in excellent yields and short reaction times.