Aryltrifluoromethylative cyclization of unactivated alkenes by the use of PhICF<sub>3</sub>Cl under catalyst-free conditions
作者:Jia Guo、Cong Xu、Xiaowei Liu、Mang Wang
DOI:10.1039/c8ob03189d
日期:——
A concise and catalyst-free aryltrifluoromethylative cyclization of unactivated alkenes has been developed herein. The use of PhICF3Cl as a powerful trifluoromethylating agent allows easy transformations. A set of trifluoroethylated carbocycles and aza-hereocycles were efficiently synthesized in good yield and selectivity. A broad substrate scope, mild reaction conditions, and easy operation would
Reactivity and properties of bis(chlorodifluoroacetyl) peroxide generated <i>in situ</i> from chlorodifluoroacetic anhydride for chlorodifluoromethylation reactions
作者:Shintaro Kawamura、Cassandra J. Henderson、Yuma Aoki、Daisuke Sekine、Shū Kobayashi、Mikiko Sodeoka
DOI:10.1039/c8cc05905e
日期:——
We developed a practical chlorodifluoromethylation reaction mediated by diacyl peroxide generated in situ from chlorodifluoroacetic anhydride. Allylic and amino-chlorodifluoromethylations of alkenes proceeded well with the combination of this reagent, Cu(II) catalyst and a pyridine additive. Carbo- and aromatic chlorodifluoromethylations proceeded under metal-free conditions.
We present a tetrahydrocarbozole-forming carbo-trifluoromethylation of indoles bearing an alkenyl group at the C3 position. The reaction proceeded selectively with the combination of TsOH·H2O as a catalyst and CH2Cl2 as a solvent. The site-selectivity could be altered by changing the reaction solvent; the use of THF instead of CH2Cl2 increased the formation of aromatic trifluoromethylation products
Perfluoroalkylation of Unactivated Alkenes with Acid Anhydrides as the Perfluoroalkyl Source
作者:Shintaro Kawamura、Mikiko Sodeoka
DOI:10.1002/anie.201604127
日期:2016.7.18
An efficient perfluoroalkylation of unactivated alkenes with perfluoro acid anhydrides was developed. Copper salts play a crucial role as a catalyst to achieve allylic perfluoroalkylation with the in situ generated bis(perfluoroacyl) peroxides. Furthermore, carboperfluoroalkylation of alkene bearing an aromatic ring at an appropriate position on the carbon side chain was found to proceed under metal‐free
An orthogonal bimetallicrelay catalytic strategy capable of enantioselectively imbedding a boryl functionality at a remote, less-activated site of aryl alkenes is disclosed. This approach was applicable to unactivated terminal and internal alkenes, as well as a mixture of olefin isomers, thus leading to the corresponding chiral products with a boryl-substituted stereogenic center β to a functional