Strontium arsenate and Sr2As2EuxO7+δ pyrochlores as reusable heterogeneous catalysts in one-pot, three-component synthesis of 2-amino-4H-chromene derivatives under microwave irradiation

Document Type : Research Article

Authors

1 Department of Inorganic Chemistry, Faculty of Chemistry, Semnan University, Semnan, Iran

2 Department of Organic Chemistry, Faculty of Chemistry, Urmia University, Urmia, Iran

Abstract

In this research work, a highly efficient procedure for the synthesis of 2-amino-4H-chromene derivatives by a one-pot, three component condensation of aromatic aldehydes, malononitrile and β-naphtol in water as the eco-friendly solvent and under microwave irradiation using Sr2As2O7 or Sr2As2EuxO7+δ as catalyst is described. It is the first report of using such catalysts in this field. The catalysts were synthesized via solvothermal method at 180 oC for 24 h and characterized by PXRD, FTIR, FESEM, EDX, UV-Vis techniques. For the catalytic performance, the reaction conditions was optimized and found that in the case of 15 mg of catalyst, water as solvent and 6 min microwave irradiation time, higher efficiency is obtained for the model reaction. The results show that aromatic aldehydes containing electron-donating or electron-withdrawing groups could produce the corresponding products, but higher efficiency was obtained with electron-withdrawing groups. Synthesized catalysts can be recycled very easily and reused for 4 runs without substantial loss in activity. Environment friendly solvent, short reaction times, easy isolation and high yield products are the advantages of presented research.

Keywords

Main Subjects

Nashrieh Shimi va Mohandesi Shimi Iran

Articles in Press, Accepted Manuscript
Available Online from 03 November 2021

Files

Share

How to cite

Statistics