Nickel-Catalyzed Markovnikov Transfer Hydrocyanation in the Absence of Lewis Acid
作者:Nils L. Frye、Anup Bhunia、Armido Studer
DOI:10.1021/acs.orglett.0c01454
日期:2020.6.5
Hydrocyanation in the absence of toxic HCN gas is highly desirable. Addressing that challenge, transition-metal-catalyzed transfer hydrocyanation using safe HCN precursors has been developed, but these reagents generally require a Lewis acid for activation, and the control of regioselectivity often remains problematic. In this Letter, a Ni-catalyzed highly Markovnikov-selective transfer hydrocyanation
Asymmetric Cu-Catalyzed Intermolecular Trifluoromethylarylation of Styrenes: Enantioselective Arylation of Benzylic Radicals
作者:Lianqian Wu、Fei Wang、Xiaolong Wan、Dinghai Wang、Pinhong Chen、Guosheng Liu
DOI:10.1021/jacs.6b13299
日期:2017.3.1
trifluoromethyl-arylation of alkenes has been developed, which provides an efficient approach to access chiral CF3-containing 1,1-diarylmethane derivatives with good to excellent enantioselectivity. Various vinyl arenes and aryl boronic acids are compatible with these conditions. The utility of the method is demonstrated by accessing modified bioactive molecules.
inhibition of the undesired Glaser coupling side reaction. The substratescope is broad, covering (hetero)aryl-, alkynyl-, and aminocarbonyl-substituted alkenes, (hetero)aryl and alkyl as well as silyl alkynes, and tertiary to primary alkyl radical precursors with excellent functional group compatibility. Facile transformations of the obtained chiral alkynes have also been demonstrated, highlighting
A strategically novel protocol for ring-opening functionalization of aryl gem-difluorocyclopropanes (F2CPs), which allows an expedient construction of CF3-containing architectures via visible-light-promoted F-nucleophilic attack manifold, was disclosed. Single electron oxidation of F2CPs was ascribed as the critical step for the success of this transformation by prompting F-nucleophilic attack, as
Asymmetric Copper-Catalyzed Intermolecular Aminoarylation of Styrenes: Efficient Access to Optical 2,2-Diarylethylamines
作者:Dinghai Wang、Lianqian Wu、Fei Wang、Xiaolong Wan、Pinhong Chen、Zhenyang Lin、Guosheng Liu
DOI:10.1021/jacs.7b02455
日期:2017.5.24
After addition to styrene, the generated benzylic radical could couple with a chiral L*CuIIAr complex to achieve enantioselective arylation. Various optical 2,2-diarylethylamines were efficiently synthesized from simple styrenes with high enantioselectivity, and these products can serve as valuablesynthons toward bioactive molecules' synthesis.