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 Aldehydes Using Bromine/Iodine Exchange
作者:Vitalij V. Levin、Vladimir O. Smirnov、Marina I. Struchkova、Alexander D. Dilman
DOI:10.1021/acs.joc.5b01590
日期:2015.9.18
A method for the iododifluoromethylation of aromatic aldehydes using (bromodifluoromethyl)trimethylsilane (Me3SiCF2Br) is described. The selective formation of the CF2I group is based on using sodium iodide, with the sodium serving as a scavenger of bromide and iodide serving as a nucleophile with respect to difluorocarbene. The primary CF2I-addition products can undergo HI-elimination or iodine/zinc exchange followed by allylation in a one-pot manner.