Issue 7, 2012

Zeolite supported Brønsted-acid ionic liquids: an eco approach for synthesis of spiro[indole-pyrido[3,2-e]thiazine] in water under ultrasonication

Abstract

A zeolite supported Brønsted-acid catalyst system has been developed using different Brønsted-acid ionic liquids supported on ZSM-5 zeolite. Catalytic activity was tested via aqueous-mediated ultrasound-promoted synthesis of novel N-substituted spiro heterocycles, which does not take place under conventional conditions. The yield of the desired products was increased in the presence of ultrasonication compared to those of conventional and MW techniques. In the presence of ultrasonication, the recyclability of this novel catalyst system was studied. There was no loss of catalytic activity up to five cycles whereas a significant loss was observed in the presence of MWs.

Graphical abstract: Zeolite supported Brønsted-acid ionic liquids: an eco approach for synthesis of spiro[indole-pyrido[3,2-e]thiazine] in water under ultrasonication

Article information

Article type
Paper
Submitted
03 Feb 2012
Accepted
19 Apr 2012
First published
20 Apr 2012

Green Chem., 2012,14, 1956-1963

Zeolite supported Brønsted-acid ionic liquids: an eco approach for synthesis of spiro[indole-pyrido[3,2-e]thiazine] in water under ultrasonication

K. Arya, D. S. Rawat and H. Sasai, Green Chem., 2012, 14, 1956 DOI: 10.1039/C2GC35168D

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