Sequential Cross‐Coupling/Annulation of
<i>ortho</i>
‐Vinyl Bromobenzenes with Aromatic Bromides for the Synthesis of Polycyclic Aromatic Compounds
作者:Dong Wei、Meng‐Yao Li、Bin‐Bin Zhu、Xiao‐Di Yang、Fang Zhang、Chen‐Guo Feng、Guo‐Qiang Lin
DOI:10.1002/anie.201910792
日期:2019.11.11
A sequential cross-coupling/annulation of ortho-vinyl bromobenzenes with aromatic bromides was realized, providing a direct and modular approach to access polycyclicaromaticcompounds. A vinyl-coordinated palladacycle was proposed as the key intermediate for this sequential process. Excellent chemoselectivity and regioselectivity were observed in this transformation. The practicability of this method
Electrochemically driven [4+2] benzannulation: synthesis of polycyclic (hetero)aromatic compounds
作者:Yunlong Liu、Pengcheng Zhou、Yingli Xu、Zhiqi Yang、Dong Wang
DOI:10.1039/d2cc06552e
日期:——
A green and economical electrochemical protocol has been developed to synthesize polycyclic (hetero)aromatic compounds by the [4+2] benzannulation of biaryldiazonium salts with alkynes. This protocol features a broad substrate scope. Instead of requiring diazonium reagents, these reactions can begin from anilines and can be carried out in one pot. Moreover, the readily accessible scale-up synthesis
Cascade Synthesis of Phenanthrenes under Photoirradiation
作者:Yongkang Li、Dan E. Wise、Joshua K. Mitchell、Marvin Parasram
DOI:10.1021/acs.joc.2c02202
日期:2023.1.6
We report a photoinduced phenanthrene synthesis from aryliodides and styrenes through an arylation/cyclization cascade. Compared to prior methods, this approach obviates the need for hazardous reagents and provides access to unsymmetrical phenanthrenes with good functional group tolerance. Mechanistic studies revealed that photoexcitation of aryliodides leads to homolytic C–I bond cleavage. Arylation