The synthesis of 4-halotetrahydropyrans and 4-halo-5,6-dihydro-2H-pyrans via the lewis acid promoted cyclization of acetals of homoallylic and homopropargylic alcohols
Highly enantioselective and regioselective catalytic dihydroxylation of homoallylic alcohol derivatives
作者:E.J Corey、Angel Guzman-Perez、Mark C Noe
DOI:10.1016/0040-4039(95)00570-3
日期:1995.5
The catalytic dihydroxylation of p-methoxyphenyl ethers of various homoallylicalcohols proceeds with excellent enantioselectivity and in the case of diolefins with regioselectivity due to the favorable influence of the aryl ether moiety, as predicted from a previously proposed transition-state model.
Visible-Light-Promoted Iododifluoromethylation of Alkenes via (Phosphonio)difluoromethyl Radical Cation
作者:Alexey L. Trifonov、Liubov I. Panferova、Vitalij V. Levin、Vladimir A. Kokorekin、Alexander D. Dilman
DOI:10.1021/acs.orglett.0c00604
日期:2020.3.20
unactivated alkenes mediated by peri-xanthenoxanthene under blue-light irradiation is described. The reaction proceeds via activation of the carbon-iodine bond to generate (phosphonio)difluoromethyl radicalcation, which attacks the double bond with subsequent quenching by the iodine. The intermediate phosphonium salts are easily hydrolyzed, furnishing products of iododifluoromethylation of alkenes.
Fluoroalkyl sulfides as photoredox-active coupling reagents for alkene difunctionalization
作者:Mikhail D. Kosobokov、Mikhail O. Zubkov、Vitalij V. Levin、Vladimir A. Kokorekin、Alexander D. Dilman
DOI:10.1039/d0cc04617e
日期:——
A visible-light-promoted fluoroalkylation-thiolation of alkenes is described. A 4-tetrafluoropyridinylthio fragment serves as a photoredox-active group in the initiation step and undergoes a radical group transfer, which is important for the reaction efficiency. In the primary products, the pyridinylthio substituent may be further functionalized via radical processes or an aromatic substitution reaction
Organophotoredox-Catalyzed Reductive Tetrafluoroalkylation of Alkenes
作者:Vladislav S. Kostromitin、Vitalij V. Levin、Alexander D. Dilman
DOI:10.1021/acs.joc.2c00712
日期:——
A method for the hydroperfluoroalkylation of alkenes with 1,2-dibromotetrafluoroethane leading to tetrafluorinated bromides is described. The reaction is conveniently performed under blue light irradiation using an organic photocatalyst and ascorbic acid as a reducing agent. Primary products can be further functionalized via radical pathways affording various tetrafluorinated compounds.
作者:Vladislav S. Kostromitin、Vitalij V. Levin、Alexander D. Dilman
DOI:10.1021/acs.joc.3c00448
日期:2023.5.5
radical difunctionalization of alkenes using fluorinated halides and a nucleophilic component (thiolate and iodide anions) is described. These nucleophilic fragments serve as redox active groups for performing subsequent transformations. The difunctionalization reaction involves photoredox generation of fluorinated radicals, their addition to the double bond followed by copper-promoted C–S or C–I bond formation