Dipolar cycloaddition of ethyl isocyanoacetate to 3-chloro-2-(methylthio)/2-(methylsulfonyl)quinoxalines: highly regio- and chemoselective synthesis of substituted imidazo[1,5-a]quinoxaline-3-carboxylates |
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| Authors: | Sundaram G S M Singh B Venkatesh C Ila H Junjappa H |
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| Institution: | Department of Chemistry, Indian Institute of Technology, Kanpur-208016, India. |
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| Abstract: | An efficient route for regio- and chemoselective synthesis of substituted 3-(carboethoxy)imidazo1,5-a]quinoxalines and novel diimidazo1,5-a:5',1'-c]quinoxalines via base-induced cycloaddition of ethyl isocyanoacetate to unsymmetrically substituted 3-chloro-2-(methylthio)/2-(methylsulfonyl)quinoxalines has been reported. |
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