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Lookup NU author(s): Dr Ross Harrington
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Triethylphosphite induced reductive cyclisation of 1-(2-nitrophenyl)-3,5-di(2-thienyl)pyrazole 6 afforded the expected 1,3-di(2-thienyl)pyrazolo[1,2-a]benzotriazole 7 (14%) together with an unexpected product which was shown to be a 2-(2-thienyl)pyrazolo[1,5-a]pyrrolo[2,1-c]quinoxaline 8 derivative (27%). A mechanism for the extrusion of sulfur during the transformation of heterocycle 6 into product 8 is proposed. (C) 2012 Elsevier Ltd. All rights reserved.
Author(s): Harrington RW, Stanforth SP
Publication type: Article
Publication status: Published
Journal: Tetrahedron Letters
Print publication date: 18/04/2012
ISSN (print): 0040-4039
ISSN (electronic): 1873-3581
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