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
iodide salts play a vital role in this reaction, which could tune carbocation reactivity through reversible C–I bond formation for controlling reaction selectivity, and a series of competitivereactions are completely eliminated in the presence of multiple reactivity pathways. The present dual catalytic protocol affords a very convenient method for direct synthesis of various difluoro-γ-lactams from simple
A Radical-Initiated Fragmentary Rearrangement Cascade of Ene-Ynamides to [1,2]-Annulated Indoles via Site-Selective Cyclization
作者:Sifan Li、Yu Wang、Zibo Wu、Weiliang Shi、Yibo Lei、Paul W. Davies、Wei Shu
DOI:10.1021/acs.orglett.1c02519
日期:2021.9.17
Herein, a radical triggered fragmentary cyclization cascade reaction of ene-ynamides is presented, providing a rapid access into [1,2]-annulated indoles by an intermolecular radical addition, intramolecular cyclization, desulfonylative aryl migration, and site-selective C(sp2)-N cyclization sequence. DFT calculations support oxidation of N-centered radical species to cations prior to the C–N bond formation
The reaction of fluorine-containing compounds with conjugated dienoic acids initiated by sodium dithionite
作者:Shengjie Mao、Xiang Fang、Lu Ba、Fanhong Wu
DOI:10.1016/j.jfluchem.2006.09.004
日期:2007.1
The reaction of fluorine-containing halides and acetamides with conjugated dienoic acids initiated by sodium dithionite gave halide-free 1,4-adducts in 40–80% yields, with the E configuration as the major products.
products, and one‐pot syntheses. Mechanistic analyses and theoretical calculations indicate that this reaction is enabled by a novel aminylradical/polar crossover mechanism, with the aminylradical being oxidized into the corresponding aminyl cation through a single electrontransfer (SET) process.