1-Iodo-polyfluoroalkanes from polyfluoroalkoxy trimethylsilanes and iodochloro triphenylphosphorane
摘要:
Polyfluoroalkoxy trimethylsilanes R(f)CH(2)OSi(CH3)(3) (from the alcohols R(f)CH(2)OH and HMDS), react with Ph(3)PICl (from ICl and Ph(3)P) eliminating (CH3)(3)SiCl. Pyrolysis or the residues gives Ph(3)PO and pure iodides R(f)CH(2).
<i>Z</i>
‐Selective Fluoroalkenylation of (Hetero)Aromatic Systems by Iodonium Reagents in Palladium‐Catalyzed Directed C−H Activation
作者:Balázs L. Tóth、Gergő Sályi、Attila Domján、Orsolya Egyed、Attila Bényei、Zsombor Gonda、Zoltán Novák
DOI:10.1002/adsc.202101108
日期:2022.1.18
The direct and catalytic incorporation of fluorine containing molecular motifs into organic compounds resulting high-value added chemicals represents a rapidly evolving part of synthetic methodologies, thus this area is in the focus of pharmaceutical and agrochemical research. Herein we report a stereoselective procedure for direct fluorovinylation of aromatic and heteroaromatic scaffolds. This methodology
An Olefinic 1,2‐Boryl‐Migration Enabled by Radical Addition: Construction of
<i>gem</i>
‐Bis(boryl)alkanes
作者:Binlin Zhao、Zexian Li、Yixiao Wu、Yandong Wang、Jiasheng Qian、Yu Yuan、Zhuangzhi Shi
DOI:10.1002/anie.201903721
日期:2019.7.8
(commercially available or prepared from alkenyl bromides and Mg) with B2Pin2 (bis(pinacolato)diboron) react with diverse alkyl halides by a Ru photocatalyst to give various gem‐bis(boryl)alkanes. Alkyl radicals add efficiently to the alkenyl diboronate complexes, and the adduct radicalanions undergo radical‐polar crossover, specifically, a 1,2‐boryl‐anion shift from boron to the α‐carbon sp2 center.
Photocatalytic Palladium-Catalyzed Fluoroalkylation of Styrene Derivatives
作者:Réka Adamik、Tamás Földesi、Zoltán Novák
DOI:10.1021/acs.orglett.0c03043
日期:2020.10.16
A visible light induced palladium-catalyzed fluoroalkylation method was developed. The Heck-type alkyl coupling reaction enables the introduction of trifluoroethyl, difluoroethyl and other fluoroalkyl fragment into styrenes under mild reaction conditions without the use of additional photosensitizers and ensures access to fluoroalkylated olefins on a broad scale.
作者:Michael Graupe、Thomas Koini、Vincent Y Wang、George M Nassif、Ramon Colorado、Ramon J Villazana、Henry Dong、Yasuhiro F Miura、Olga E Shmakova、T.Randall Lee
DOI:10.1016/s0022-1139(98)00284-x
日期:1999.2
good yields under free radical conditions. Reduction of the resulting secondary iodides gave long-chain alkanethioacetates with perfluoroalkylterminalsegments. These intermediates were readily transformed into the corresponding terminally perfluorinated alkanethiols by acidic deprotection. The product thiols should find use in the generation of well-defined fluorinated interfaces using the self-assembled
Photocatalytic Reductive Fluoroalkylation of Nitrones
作者:Vyacheslav I. Supranovich、Vitalij V. Levin、Marina I. Struchkova、Alexander D. Dilman
DOI:10.1021/acs.orglett.7b03987
日期:2018.2.2
A method for the addition of fluorinated groups to nitrones using an iridium photocatalyst and ascorbic acid as a stoichiometric reducing agent is described. The reaction proceeds through the generation of fluorinated radicals by single-electron reduction of fluorinated alkyl iodides with an iridium complex mediated by visible light. Besides perfluorinated reagents, partially fluorinated alkyl iodides