Visible-Light-Driven, Photoredox-Catalyzed Cascade of <i>ortho-</i>Hydroxycinnamic Esters To Access 3-Fluoroalkylated Coumarins
作者:Dan Song、Chao-Ming Wang、Zhi-Peng Ye、Peng-Ju Xia、Zhi-Xiong Deng、Jun-An Xiao、Hao-Yue Xiang、Hua Yang
DOI:10.1021/acs.joc.9b00715
日期:2019.6.7
A general and straightforward protocol for di-/perfluoroalkylation of ortho-hydroxycinnamic esters via a photoredox-catalyzed cascade was developed to access a variety of 3-fluoroalkylated coumarins. This method was characterized by all-in-one synthetic design, simplified operation, mild reaction conditions, and broad substrate scope. Moreover, a sequential one-pot procedure starting from commercially available salicylaldehyde was also successfully realized to synthesize 3-fluoroalkylated coumarins.
<i>Ortho</i>-Dearomatization of Phenols Creating All-Carbon Spiro-Bicycles
作者:Chao Zheng、Lu Wang、Jingjie Li、Leifeng Wang、David Zhigang Wang
DOI:10.1021/ol401863k
日期:2013.8.16
A range of alkene-linked phenols are generally and reliably dearomatized specifically at their ortho-positions to create all-carbon quaternary stereogenic centers at the corresponding spiro-ring junctions, thus establishing a viable solution to the long-standing synthetic challenge.
Visible-Light-Driven, Photocatalyst-Free Cascade to Access 3-Cyanoalkyl Coumarins from <i>ortho</i>-Hydroxycinnamic Esters