An efficient synthesis of some new curcumin based pyrano[2,3-d] pyrimidine-2,4(3H)-dione derivatives using CoFe2O4@OCMC@Cu(BDC) as a novel and recoverable catalyst

( )Curcumin (bis-alpha,beta-unsaturated beta-diketone) is a low molecular weight hydrophobic polyphenol isolated from Curcuma longa. Curcumin has attracted significant recent consideration due to its medicinal and pharmacological properties. In this research pyrano[2,3-d]pyrimidine-2,4(3H)-dione derivatives were prepared in excellent yields and short reaction times by a one-pot multi-component cyclocondensation of curcumin, substituted aromatic aldehydes and barbituric acid in the presence of CoFe2O4@OCMC@Cu(BDC) nanostructure as an effective and robust catalyst. The CoFe2O4 functionalized OCMC@Cu(BDC) is introduced as a new, strong and efficient catalyst for the synthesis of a variety of heterocyclic compounds. The catalyst was perfectly characterized by various spectroscopy methods such as Fouriertransform infrared spectroscopy (FT-IR), Energy-dispersive X-ray (EDX), Scanning electron microscope (SEM), X-ray diffraction (XRD) and N2 adsorption-desorption isotherm (BET). Furthermore, the heterocyclic compounds were fully characterized by different spectral techniques including FT-IR, (HNMR)-H-1, (CNMR)-C-13. The magnetic catalyst could be easily recycled and reused for seven runs with a slightly decrease in its activity. (C) 2019 Elsevier B.V. All rights reserved.