Visible-Light-Driven Difluoroacetamidation of Unactive Arenes and Heteroarenes by Direct C–H Functionalization at Room Temperature
作者:Lin Wang、Xiao-Jing Wei、Wen-Liang Jia、Jian-Ji Zhong、Li-Zhu Wu、Qiang Liu
DOI:10.1021/ol502676y
日期:2014.11.21
The directed difluoroacetamidation of unactivated arenes and heteroarenes with bromodifluoroacetamides via visible-light photoredox catalysis has been efficiently achieved at room temperature. Broad utility of this transformation is presented, including electronically deficient heteroaromatic and aromatic systems. The mechanistic pathway of the difluoroacetamidation was discussed based on photoluminescence
Photocatalytic reductive radical–radical coupling of <i>N</i>,<i>N</i>′-cyclicazomethine imines with difluorobromo derivatives
作者:Peng-Ju Xia、Zhi-Peng Ye、Dan Song、Ji-Wei Ren、Han-Wen Wu、Jun-An Xiao、Hao-Yue Xiang、Xiao-Qing Chen、Hua Yang
DOI:10.1039/c8cc09385g
日期:——
A visible-light-induced difluoroalkylation of N,N′-cyclicazomethine imine was successfully realized through a novel photoredox radical–radical cross-coupling reaction. This developed protocol exhibits high functional group tolerance and affords a variety of difluorinated 3-pyrazolidinone scaffolds. Extensive mechanistic investigations have been undertaken, well revealing the involvement of a reductive
bromide and terminal alkenes. The reaction involves fluoroalkylation of alkenes and migration of double bonds via a 1,5-hydrogen atom transfer strategy. Through this method, a series of remote fluoroalkylated alkenes was obtained under mild conditions.
Photoredox-Catalyzed Remote Difunctionalizations of Alkenes To Synthesize Fluoroalkyl Ketones with Dimethyl Sulfoxide as the Oxidant
作者:Lixin Li、Haotian Luo、Zhengguang Zhao、Yong Li、Qiuju Zhou、Jing Xu、Jie Li、Yan-Na Ma
DOI:10.1021/acs.orglett.9b03594
日期:2019.11.15
remote benzyl C-H bond activation via a 1,5-H shift in a highly controlled site-selective manner and Kornblum reaction with dimethylsulfoxide as the oxidant. With this method, a broad array of fluoroalkyl groups were introduced into a double bond to produce 1,6-fluoroalkylated ketones at room temperature.
Palladium-Catalyzed Remote Aryldifluoroalkylation of Alkenyl Aldehydes
作者:Xingliang Nie、Cungui Cheng、Gangguo Zhu
DOI:10.1002/anie.201611697
日期:2017.2.6
A palladium‐catalyzed three‐component reaction between fluoroalkyl bromides, arylboronic acids, and alkenyl aldehydes has been developed and provides facile access to 5‐, 6‐, or 7‐difluoroalkylated ketones under very mild reaction conditions. The resultant products can be smoothly converted into CF2‐containing tetrahydronaphthalenes by a novel silver‐catalyzed intramolecular decarboxylative cyclization