Fluorinative Rearrangements of Substituted Phenylallenes Mediated by (Difluoroiodo)toluene: Synthesis of α-(Difluoromethyl)styrenes
作者:Zhensheng Zhao、Léanne Racicot、Graham K. Murphy
DOI:10.1002/anie.201706798
日期:2017.9.11
(difluoroiodo)toluene in the presence of 20 mol % BF3⋅OEt2 to yield α‐difluoromethyl styrenes. This unprecedented reaction was entirely chemoselective for the internal allene π bond, and showed remarkable regioselectivity during the fluorination event. Substituted phenylallenes, phenylallenes possessing both phenyl‐ and α‐allenyl substituents, and diphenylallenes were investigated, and good functional‐group
Catalytic Enantioselective Synthesis of Highly Functionalized Difluoromethylated Cyclopropanes
作者:Maxence Bos、Wei-Sheng Huang、Thomas Poisson、Xavier Pannecoucke、André B. Charette、Philippe Jubault
DOI:10.1002/anie.201707375
日期:2017.10.16
The first catalyticasymmetricsynthesis of highly functionalized difluoromethylated cyclopropanes is described. The method, based on a rhodium‐catalyzed cyclopropanation of difluoromethylated olefins, gives access to a broad range of cyclopropanes bearing ester, ketone, or nitro functional groups. By using Rh2((S)‐BTPCP)4 as a catalyst, the corresponding products were obtained in high yields and high
Biocatalytic Strategy for the Highly Stereoselective Synthesis of CHF
<sub>2</sub>
‐Containing Trisubstituted Cyclopropanes
作者:Daniela M. Carminati、Jonathan Decaens、Samuel Couve‐Bonnaire、Philippe Jubault、Rudi Fasan
DOI:10.1002/anie.202015895
日期:2021.3.22
Enantiodivergent selectivity and extension of the method to the stereoselective cyclopropanation of mono‐ and trifluoromethylated olefins was also achieved. This methodology represents a powerful strategy for the stereoselectivesynthesis of high‐value fluorinated building blocks for medicinal chemistry, as exemplified by the formal total synthesis of a CHF2 isostere of a TRPV1 inhibitor.
Photocatalytic Hydroacylation of Alkenes by Directly Using Acyl Oximes
作者:Lan Zheng、Peng-Ju Xia、Qing-Lan Zhao、Yu-En Qian、Wen-Nian Jiang、Hao-Yue Xiang、Hua Yang
DOI:10.1021/acs.joc.0c01818
日期:2020.9.18
are directly used as the acyl radical precursors in the hydroacylation reactions for the first time. In this work, acyl radicals can be effectively generated viaβ-scission of a phosphoranyl radical under photocatalytic conditions. As a result, the hydroacylation of alkenes triggered by the resulting acyl radicals leads to facile syntheses of a range of valuable ketones.
The electrochemical synthesis of fluorinated allyl silanes and boronates is disclosed. Through the electrogeneration of boryl and silyl radical a panel of α-trifluoromethyl or α-difluoromethylstyrenes was converted into the corresponding allyl silanes and boronates in good to excellent yields (64 examples, from 31 % to 95 % yield). A scale up of the reactions under continuous flow was showcased and