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Title: | Microwave-Assisted Expedite Synthesis of 2-Phenylimidazo[1,2-a]pyridylquinoxalin-2(1H)-ones |
Authors: | Kumar, Anil Sakhuja, Rajeev |
Keywords: | Chemistry Microwave Synthesis of 2-Phenylimidazo |
Issue Date: | 31-May-2014 |
Publisher: | Wiley |
Abstract: | An efficient methodology has been developed for the synthesis of quinoxalin-2(1H)-one derivatives of 2-phenylimidazo[1,2-a]pyridines by microwave-irradiated Hinsberg heterocyclization between 2-phenylimidazo[1,2-a]pyridine-3-glyoxalates and o-phenylenediamine using either montmorillonite K-10 or Yb(OTf)3 as catalysts. Montmorillonite K-10 was proven to be an efficient catalyst for the heterocyclization reaction between sterically hindered glyoxalate and o-phenylenediamine only under microwave conditions. The use of Yb(OTf)3/tetrahydrofuran was also found to be an effective catalyst for the above chemical transformation among a series of Lewis acids screened under microwave conditions; however, comparatively lesser yields were obtained as compared with the use of montmorillonite K-10. |
URI: | https://onlinelibrary.wiley.com/doi/abs/10.1002/jhet.2189 http://dspace.bits-pilani.ac.in:8080/xmlui/handle/123456789/2862 |
Appears in Collections: | Department of Chemistry |
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