A green protocol for synthesis of pyran annulated hetrocyclic systems using Na2SO4 as an efficient catalyst

Authors

• Malek Taher Maghsoodlou ¹
• Amin Masoumnia ²
• Mir Rasul Mousavi ²
• Nourollah Hazeri ²
• Jasem Aboonajmi ³
• Sayyed Mostafa Habibi-Khorasani ²
• Shiva Kiaee ²

1. Chemistry Department, Faculty of Science, University of Sistan and Baluchestan, Zahedan, Iran
2. Department of Chemistry, The University of Sistan and Baluchestan, P.O. Box 98135-674, Zahedan, Iran
3. Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71454, Iran

Abstract

Na2SO4 as an inexpensive and effective catalyst has provided a green protocol for the synthesis of tetrahydrobenzo[b]pyran, pyrano[2,3-d]pyrimidinone and dihydropyrano[3,2c]chromene derivatives from the three-component domino reaction of aromatic aldehydes and malononitrile with 4-hydroxycoumarin/ dimedone/ barbituric acid in ethanol/water as a mixture of solvent that, this mixture entirely is green solvent. Products could simply be separated from the catalyst. Using neutral and mild conditions, short reaction time, environmentally benign procedure, high to excellent yields of the products and easy work-up without using column chromatography are the advantages of this method. By virtue of these advantages, sodium sulfate can be used as catalyst in the organic transformations.

Keywords

• 4-hydroxycoumarin
• Green protocol
• Pyran annulated hetrocyclic systems
• Na2SO4
• Barbituric acid