Photoelectrochemical C−H Alkylation of Heteroarenes with Organotrifluoroborates
作者:Hong Yan、Zhong‐Wei Hou、Hai‐Chao Xu
DOI:10.1002/anie.201814488
日期:2019.3.26
A photoelectrochemical method for the C−H alkylation of heteroarenes with organotrifluoroborates has been developed. The merger of electrocatalysis and photoredox catalysis provides a chemical oxidant‐free approach for the generation and functionalization of alkylradicals from organotrifluoroborates. A variety of heteroarenes were functionalized using primary, secondary, and tertiary alkyltrifluoroborates
Photoredox-Mediated Minisci-type Alkylation of <i>N</i>-Heteroarenes with Alkanes with High Methylene Selectivity
作者:Guo-Xing Li、Xiafei Hu、Gang He、Gong Chen
DOI:10.1021/acscatal.8b04079
日期:2018.12.7
We report a highly efficient and chemoselective Minisci-type alkylation reaction of N-heteroarenes with alkanes under the reagent control of a hypervalent iodine oxidant PFBI-OH. In addition to the high reactivity, PFBI-OH demonstrated a high steric sensitivity for H abstraction of alkanes. This reaction is selective for more sterically accessible secondary C–H bonds over weaker tertiary C–H bonds
Ligand-Accelerated Iron Photocatalysis Enabling Decarboxylative Alkylation of Heteroarenes
作者:Zhenlong Li、Xiaofei Wang、Siqi Xia、Jian Jin
DOI:10.1021/acs.orglett.9b01439
日期:2019.6.7
A mild, practical protocol for the decarboxylative alkylation of heteroarenes has been accomplished via iron photocatalysis. A diverse range of carboxylic acids readily undergo oxidative decarboxylation and then couple with a broad array of heteroarenes in this transformation. The photoexcited state lifetimes of iron complexes are typically much shorter than those of iridium and ruthenium complexes. Here we describe our effort on iron photocatalysis by utilizing the intramolecular charge transfer pathway of iron-carboxylate complexes.