Remote Regioselective Radical C–H Functionalization of Unactivated C–H Bonds in Amides: The Synthesis of <i>gem</i>-Difluoroalkenes
作者:Qu-Ping Hu、Jing Cheng、Ying Wang、Jie Shi、Bi-Qin Wang、Ping Hu、Ke-Qing Zhao、Fei Pan
DOI:10.1021/acs.orglett.1c01385
日期:2021.6.4
The site-selective functionalization of unactivated aliphatic amines is an attractive and challenging synthetic approach. We herein report a general strategy for the remote site-selective functionalization of unactivated C(sp3)–H bonds in amides by photogenerated amidyl radicals to form gem-difluoroalkenes with trifluoromethyl-substituted alkenes. The site selectivity is controlled by a 1,5-hydrogen
Regioselective Alkylative Cross-Coupling of Remote Unactivated C(<i>sp</i><sup>3</sup>)–H Bonds
作者:Scott M. Thullen、Sean M. Treacy、Tomislav Rovis
DOI:10.1021/jacs.9b07014
日期:2019.9.11
The functionalization of unactivatedC(sp3)-H bonds poses a significant challenge due to their ubiquity and relative similarity in most organic frameworks. Herein, we describe the use of a combined photoredox and nickel catalytic system for the regioselective C(sp3)-C(sp3) coupling of unactivatedC(sp3)-H bonds and alkyl bromides. Positional selectivity is dictated by a 1,5-hydrogen atom transfer (HAT)
Remote Allylation of Unactivated C(sp<sup>3</sup>)–H Bonds Triggered by Photogenerated Amidyl Radicals
作者:Bin Xu、Uttam K. Tambar
DOI:10.1021/acscatal.9b00563
日期:2019.5.3
The allylationreaction is a highly versatile transformation in chemical synthesis. While many elegant direct C(sp2)–H allylationreactions have been developed, the direct allylation of unactivated C(sp3)–H bonds is underdeveloped. By applying photoredox catalysis and a [1,5]-HAT process, herein we report a direct allylation of unactivated C(sp3)–H bonds. This photocatalyzed transformation is tolerant
Synthesis of Isothiocyanates by Reaction of Amides with Carbon Disulfide in the Presence of Solid Potassium Carbonate/Sodium Hydroxide Mixture
作者:Domenico Albanese、Michele Penso
DOI:10.1055/s-1991-26629
日期:——
Readily available N-monosubstituted trifluoroacetamides are transformed into isothiocyanates in good yield by reaction, at room temperature, with carbon disulfide in acetonitrile in the presence of anhydrous sodium hydroxide/potassium carbonate basic mixture.
Photoinduced remote regioselective radical alkynylation of unactivated C–H bonds
作者:Qu-Ping Hu、Yu-Tao Liu、Yong-Ze Liu、Fei Pan
DOI:10.1039/d1cc06885g
日期:——
method for the remote regioselective alkynylation of unactivated C(sp3)–H bonds in diverse aliphatic amides by photogenerated amidyl radicals has been developed. The site-selectivity is dominated via a 1,5-hydrogenatomtransfer (HAT) process of the amide. Mild reaction conditions and high regioselectivity are demonstrated in this methodology.