Metal-Free Photocatalyzed Cross Coupling of Bromoheteroarenes with Pyrroles
作者:Leyre Marzo、Indrajit Ghosh、Francisco Esteban、Burkhard König
DOI:10.1021/acscatal.6b01452
日期:2016.10.7
successively trapped by pyrroles for the synthesis of heteroaromatic biaryls in moderate to excellent yields. The synthetically important photoredox catalytic C–H heteroarylation reaction works for a broad range of brominated electron-rich heteroarenes and chlorinated heteroarenes bearing electron withdrawing groups. In addition, this methodology was applied to the formal synthesis of a benzimidazole derivative
Synthesis of π-conjugated systems bearing thiophene and pyrrole heterocycles through palladium catalyzed cross-coupling reactions
作者:M. Cidália R. Castro、M. Manuela M. Raposo
DOI:10.1016/j.tet.2016.02.054
日期:2016.4
synthesized using commercially or readily available coupling components, through three different palladium catalyzed cross-coupling reactions (Suzuki-Miyaura, Stille and decarboxylativecoupling). The synthesis of compounds 5 via the Suzuki-Miyaura reaction produced the title compounds in better yields than the other coupling reactions, while, decarboxylativecoupling resulted in the lower yields. UV–visible
通过三种不同的钯催化的交叉偶联反应(Suzuki-Miyaura,Stille和脱羧偶联),使用市售或易于获得的偶联组分,合成了一系列噻吩基吡咯和噻吩基吡咯及其甲酰基衍生物5a - d。通过Suzuki-Miyaura反应合成的化合物5产生的标题化合物的收率高于其他偶联反应,而脱羧偶联的收率则较低。紫外线可见和11 H NMR研究证实存在从供体吡咯杂环到受体基团的明显的分子内电荷转移(ICT),并且整个π-共轭体系具有高极化率。这些特性共同表明了它们作为制备光学应用推挽杂环化合物的通用前体的强大潜力。
Biaryl Cross‐Coupling Enabled by Photo‐Induced Electron Transfer
作者:Hirohito Hayashi、Bin Wang、Xiangyang Wu、Shi Jie Teo、Atsushi Kaga、Kohei Watanabe、Ryo Takita、Edwin K. L. Yeow、Shunsuke Chiba
DOI:10.1002/adsc.201901601
日期:2020.5.26
a protocol for aryl cross‐coupling of electron‐deficient aryl halides with electron‐rich (hetero)arenes that is driven solely by violet light. This process takes advantage of formation of photo‐excited state of electron‐deficient aryl halides, that are reduced by electron‐rich (hetero)arenes to form a pair of aryl anion and cationradicals. The resulting aryl anion radicals of aryl halides undergo mesolysis