Synthesis and Characterization of Copper-Salen Complex on Periodic Mesoporous Organosilica and its Application in Synthesis of Pyrano (2,3-d) Pyrimidine Derivatives

Nanoporous materials are porous in the nanoscale and have very diverse, regular structurewith a high ratio, selectivity of shape and size, which has resulted in their application in catalytsis,purification, and separation [1]. Periodic mesoporous organosilicas (PMOs) is one ofthe most advanced organic and inorganic hybrid materials that has attracted the attention ofmany researchers today. In order to enhance the applications of nanoporous compounds invarious fields such as catalysts, chemical sensors and chromatography, surface of silica mesoporousmust be functionalized with appropriate functional groups [2, 3]. Herein, we report thesynthesis of copper(salen) complex immobilized on periodic mesoporous organosilica and itsapplication as catalyst for the synthesis of pyrano (2,3-d) pyrimidine derivatives by using aldehydes,malononitrile and barbituric acid under solvent-free conditions. The activity and recoveryof the catalyst under reaction conditions were also examined (Fig. 1).