title: 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.
abstract: An efficient route for regio- and chemoselective synthesis of substituted 3-(carboethoxy)imidazo[1,5-a]quinoxalines and novel diimidazo[1,5-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.
authors.affiliation: Department of Chemistry, Indian Institute of Technology, Kanpur-208016, India.
authors.forename: G S M
authors.initials: GS
authors.lastname: Sundaram
authors.forename: B
authors.initials: B
authors.lastname: Singh
authors.forename: C
authors.initials: C
authors.lastname: Venkatesh
authors.forename: H
authors.initials: H
authors.lastname: Ila
authors.forename: H
authors.initials: H
authors.lastname: Junjappa
mesh_terms: D002264:Carboxylic Acids / Q000138:chemical synthesis / Q000737:chemistry*; D002713:Chlorine / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry*; D017953:Isocyanates / Q000737:chemistry*; D008745:Methylation; D015394:Molecular Structure; D011810:Quinoxalines / Q000737:chemistry*; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D013455:Sulfur / Q000737:chemistry*
chemical_list: D002264:Carboxylic Acids; D007093:Imidazoles; D017953:Isocyanates; D011810:Quinoxalines; D013438:Sulfhydryl Compounds; D002713:Chlorine; D013455:Sulfur; C029899:imidazole; C053447:ethyl isocyanate