Rh(III)-Catalyzed Aryl and Alkenyl C–H Bond Addition to Diverse Nitroalkenes
作者:Tyler J. Potter、David N. Kamber、Brandon Q. Mercado、Jonathan A. Ellman
DOI:10.1021/acscatal.6b03217
日期:2017.1.6
The transition-metal-catalyzed C–H bond addition to nitroalkenes has been developed. Very broad nitroalkene scope was observed for this Rh(III)-catalyzed method, including for aliphatic, aromatic, and β,β-disubstituted derivatives. Additionally, various directing groups and both aromatic and alkenyl C–H bonds were effective in this transformation. Representative nitroalkane products were converted
Rh(III)-Catalyzed Halogenation of Vinylic C–H Bonds: Rapid and General Access to <i>Z</i>-Halo Acrylamides
作者:Nadine Kuhl、Nils Schröder、Frank Glorius
DOI:10.1021/ol4015915
日期:2013.8.2
examples for the bromination, of readily available acrylamides to access a variety of differently substituted Z-haloacrylic acid derivatives is reported. The reaction proceeds under mild conditions via a Rh(III)-catalyzed C–H-activation/halogenation mechanism and represents a rare example of a direct halogenation of electron-poor acrylic acid derivatives.
A palladium-catalyzedC–Hbond functionalization of acrylamides was developed to build up stereoselectively trifluoromethylated 1,3-butadienes. Using a tertiary amide as a directing group, olefins were selectively functionalized with 2-bromo-3,3,3-trifluoropropene to access these important fluorinated compounds. The methodology was extended to the construction of pentafluoroethyl-substituted 1,3-dienes
Electrochemical Difluoromethylation of Electron‐Deficient Alkenes
作者:He‐Huan Xu、Jinshuai Song、Hai‐Chao Xu
DOI:10.1002/cssc.201803058
日期:2019.7.5
Electrochemical 1,2‐hydroxydifluoromethylation and C−H difluoromethylation of acrylamides were developed by using CF2HSO2NHNHBoc as the source of the CF2H group. These electricity‐powered oxidative alkene functionalization reactions do not need transition‐metal catalysts or chemical oxidants. The reaction outcome, 1,2‐difuntionalization or C−H functionalization, is determined by the substituents on