Synthesis of new thieno[3,2-b]pyridine derivatives by palladium-catalyzed couplings and intramolecular cyclizations
作者:Ricardo C. Calhelha、Maria-João R.P. Queiroz
DOI:10.1016/j.tetlet.2009.10.138
日期:2010.1
di(hetero)arylamines were obtained by C–N Buchwald–Hartwig coupling with bromonitrobenzenes and with 2-bromopyridine. In the latter case a tetracyclic compound was formed by intramolecular cyclization. Using a brominated derivative in the pyridine ring as a coupling component, it was possible to synthesize C–C (Suzuki and Sonogashira) and C–N (Buchwald–Hartwig) coupling products and a tetracyclic compound obtained
两个甲基3-氨基噻吩并[3,2- b ]吡啶-2-羧酸盐是从3制备-氟或3- nitropicolinonitriles和巯基乙酸甲酯在DMF / KOH(水溶液)。从吡啶环中未取代的前体中,通过C–N Buchwald–Hartwig与溴硝基苯和2-溴吡啶的偶联,获得二(杂)芳基胺。在后一种情况下,通过分子内环化形成四环化合物。使用吡啶环中的溴化衍生物作为偶联成分,可以合成C–C(Suzuki和Sonogashira)和C–N(Buchwald–Hartwig)偶联产物,以及通过噻吩并吡啶系统双官能化获得的四环化合物。