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Cascade Synthesis of Benzothieno[3,2- b]indoles under Oxidative Conditions Mediated by CuBr and tert-Butyl Hydroperoxide. 2018
Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology , Tianjin University , Tianjin 300072 , China.
A series of biologically relevant compounds of benzothieno[3,2- b]indole derivatives were conveniently synthesized from reactions of N-protected 2-((2-bromophenyl)ethynyl)anilines and potassium ethylxanthate, mediated by cuprous bromide/ tert-butyl hydroperoxide. The method features the construction of the pyrrole and thiophene rings in a cascade sequence with the pyrrole ring being formed prior to the thiophene ring via a possible reactive Cu(III)-pyrrole intermediate.
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