Aromatization of dihydronaphthalenes have been accomplished under mild conditions using an organic photocatalyst. Scope and limitations of the approach have been evaluated along with the reaction mechanism.
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
Phenanthrenes and chrysenes are readily obtained by reaction of biphenyl-2-diazonium tetrafluoroborates or 2-phenylnaphthalene-1-diazonium tetrafluoroborates, respectively, with mono-substituted acetylenes in pyridine at 0°C.
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