Degenerative xanthate transfer to olefins under visible-light photocatalysis
作者:Atsushi Kaga、Xiangyang Wu、Joel Yi Jie Lim、Hirohito Hayashi、Yunpeng Lu、Edwin K L Yeow、Shunsuke Chiba
DOI:10.3762/bjoc.14.283
日期:——
The degenerative transfer of xanthates to olefins is enabled by the iridium-based photocatalyst [IrdF(CF3)ppy}2(dtbbpy)](PF6) under blue LED light irradiation. Detailed mechanistic investigations through kinetics and photophysical studies revealed that the process operates under a radical chain mechanism, which is initiated through triplet-sensitization of xanthates by the long-lived triplet state
Visible light/Ir(III) photocatalytic initiation of xanthate-based radical-chain reactions: Xanthate group transfer and oxidative addition to aromatic systems
作者:Pedro López-Mendoza、John E. Díaz、Alix E. Loaiza、Luis D. Miranda
DOI:10.1016/j.tet.2018.04.079
日期:2018.9
The protocol can be used in classical xanthate-based inter- and intra-molecular group transfer reactions and oxidative radical addition to several heteroaromatic systems. The process does not require high temperature and reactions are cleaner compared with the traditional peroxide initiation. In the oxidative addition to aromatic systems, the oxidation process is part of the catalytic cycle and does
Formation of Carbon−Nitrogen Bonds via a Novel Radical Azidation Process
作者:Cyril Ollivier、Philippe Renaud
DOI:10.1021/ja000673h
日期:2000.7.1
A Novel Approach for the Formation of Carbon−Nitrogen Bonds: Azidation of Alkyl Radicals with Sulfonyl Azides
作者:Cyril Ollivier、Philippe Renaud
DOI:10.1021/ja004129k
日期:2001.5.1
Two preparatively attractive methods for the azidation of alkyl radicals are described. Secondary and tertiary alkyl iodides and dithiocarbonates are easily converted into the corresponding azides, either by reaction with ethanesulfonyl azide in the presence of dilauroyl peroxide, or by treatment with benzenesulfonyl azide and hexabutylditin in the presence of a radical initiator. Interestingly, intramolecular
A Convergent Approach to 1,3-Dithiolan-2-ones and an Unexpected Synthesis of Lactones
作者:Xianzhu Zeng、Samir Z. Zard
DOI:10.1021/acs.orglett.2c02215
日期:2022.7.29
reagents, and is atom economical, since both sulfur atoms of the xanthate end up in the products. With adducts derived from xanthates bearing an ester group, an unexpected transformation leading to lactones was uncovered.