Nucleophilic Bromo- and Iododifluoromethylation of Aldehydes
作者:Mikhail D. Kosobokov、Vitalij V. Levin、Marina I. Struchkova、Alexander D. Dilman
DOI:10.1021/ol501674n
日期:2014.7.18
A method for bromo- and iododifluoromethylation of aldehydes using bromo- and iodo-substituted difluoromethyl silicon reagents (Me3SiCF2X) is described. The reaction is performed in the presence of a combination of tetrabutylammonium and lithium salts Bu4NX/LiX (X = Br or I) in propionitrile. It is believed that, in this process, a short-lived halodifluoromethyl carbanion serves as nucleophile, which
Visible light-mediated difluoroalkylation of electron-deficient alkenes
作者:Vyacheslav I Supranovich、Vitalij V Levin、Marina I Struchkova、Jinbo Hu、Alexander D Dilman
DOI:10.3762/bjoc.14.139
日期:——
A method for the reductive difluoroalkylation of electron-deficientalkenes using 1,1-difluorinated iodides mediated by irradiation with blue light is described. The reaction involves radicaladdition of 1,1-difluorinated radicals at the double bond followed by hydrogen atom transfer from sodium cyanoborohydride.
Photoredox mediated annelation of iododifluoromethylated alcohols with 1,1-diarylethylenes
作者:Liubov I. Panferova、Grigory N. Chernov、Vitalij V. Levin、Vladimir A. Kokorekin、Alexander D. Dilman
DOI:10.1016/j.tet.2018.10.062
日期:2018.12
A method for the synthesis of 3,3-difluorotetrahydrofurans from iododifluoromethylated alcohols and 1,1-diarylethylenes is described. The reaction is performed under irradiation with 400 nm light emitting diodes in the presence of a cationic iridium(III) photocatalyst, [Ir(ppy)2(dtbbpy)]PF6, substoichiometric amounts of triphenylphosphine and sodium trifluoroacetate as a base.
Light-Promoted Allylation of Iododifluoromethylated Alcohols
作者:Liubov I. Panferova、Marina I. Struchkova、Alexander D. Dilman
DOI:10.1002/ejoc.201800543
日期:2018.8.1
A method for the synthesis of β,β‐difluorinated alcohols by the formal substitution of iodine in the iododifluoromethyl fragment by the allylgroup is described. The reaction involves silylation of the starting alcohols with allyl(chloro)dimethylsilane followed by an light‐promoted atom transfer process. The C,C‐bond‐forming event proceeds through 7‐endo‐trig radical cyclization.
Nucleophilic Iododifluoromethylation of Carbonyl Compounds Using Difluoromethyl 2-Pyridyl Sulfone
作者:Wenjun Miao、Chuanfa Ni、Yanchuan Zhao、Jinbo Hu
DOI:10.1021/acs.orglett.6b01258
日期:2016.6.3
A new, efficient method for iododifluoromethylation of carbonyl compounds utilizing difluoromethyl 2-pyridyl sulfone (2-PySO2CF2H) is described. This transformation is achieved by a nucleophilic addition of 2-PySO2CF2H with carbonyl compounds and a subsequent iodination of sulfinate, which is generated in situ by a novel zinc-mediated depyridination reaction. The method employs mild reaction conditions