Brønsted acidic ionic liquids promoted cyclocondensation reaction: Synthesis of 1,8-dioxo-octahydroxanthene - 30/09/11

Doi : 10.1016/j.crci.2011.04.008

P.P. Salvi ^a, A.M. Mandhare ^a, A.S. Sartape ^a, D.K. Pawar ^a, S.H. Han ^b, S.S. Kolekar ^a,^⁎
^a Department of chemistry, Shivaji University, Kolhapur, 416 004 (MS), India
^b Inorganic nano-material laboratory, department of chemistry, Hanyang University, Seoul 133-791, South Korea

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Abstract

Novel Brønsted acidic ionic liquids bearing hydrogen sulfate and dihydrogen phosphate as anions were designed and successfully applied as catalysts for the one-pot synthesis of 1,8-dioxo-octahydroxanthene in water medium. The sequence of the catalytic activity observed in the transformation was in good agreement. In this article, six different ionic liquids (ILs) such as, [BMIM][BF₄], [CMIM][HSO₄], [NMP][HSO₄], [BMIM][HSO₄], [(CH₂)₄SO₃HMIM][HSO₄], [BMIM][H₂PO₄] were synthesized and used as a catalyst for synthesis of 1,8-dioxo-octahydroxanthene very first time. The products could be conveniently separated from the reaction mixture by filtration and the dissolved catalyst can be regenerated and recycled several times without significant loss of activity.

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Keywords : Brønsted acidic ionic liquids, Green catalyst, Multicomponent reaction, 1,8-dioxo-octahydroxanthene, Regeneration of catalyst

Plan

Introduction

Results and discussion

Promoting effect of BAILs

Effects of different reaction conditions using [CMIM][HSO₄] as a catalyst

Reusability of [CMIM] [HSO₄]

Conclusion

Experimental

Materials and methods

Synthesis of ionic liquids

General procedure

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Vol 14 - N° 10

P. 883-886 - octobre 2011 Retour au numéro

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An efficient protocol for synthesis of tetrahydrobenzo[b]pyrans using amino functionalized ionic liquid
P.P. Salvi, A.M. Mandhare, A.S. Sartape, D.K. Pawar, S.H. Han, S.S. Kolekar

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Brønsted acidic ionic liquids promoted cyclocondensation reaction: Synthesis of 1,8-dioxo-octahydroxanthene - 30/09/11

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