Mesolite: An Efficient Heterogeneous Catalyst for One-Pot Synthesis of 2-Amino-4H-chromenes

Abstract

An efficient and environmentally benign method for one-pot three-component synthesis of 2-Amino-4H-chromenes has been developed by cyclocondensation of benzaldehyde, malononitrile and resorcinol using newly modified mesolite-type natural zeolite as green catalyst. The catalyst was structurally modified by sulfuric acid treatment and characterized by X-ray diffraction, FT-IR, NH₃-TPD, SEM-EDS and BET. This method offers several advantages over the reported methods such as simple and inexpensive modification of catalyst, mild reaction conditions, excellent yield and reusability of catalyst.

KEYWORDS:

• 2-Amino-4H- chromenes
• benzaldehyde
• malononitrile
• mesolite
• one-pot synthesis
• resorcinol

Acknowledgment

We are grateful to the Head, Department of Chemistry, Dr Babasaheb Ambedkar Marathwada University, Aurangabad–431004 (MS), India for providing the laboratory facility. The authors are thankful to STIC Cochin and IIT Madras for providing characterization facilities.