An environmentally benign method for the synthesis of aryl sulfides in water under mild conditions has been realized, in which arenes are coupled with equal stoichiometry of allyl sulfides. This arylthiolation is enabled by the presence of the Lipshutz surfactant, TPGS-750-M, using water as the recyclable reaction medium.
Radical–Radical Cross-Coupling for C–S Bond Formation
作者:Zhiliang Huang、Dongchao Zhang、Xiaotian Qi、Zhiyuan Yan、Mengfan Wang、Haiming Yan、Aiwen Lei
DOI:10.1021/acs.orglett.6b00764
日期:2016.5.20
A new method was demonstrated to overcome the selectivity issue of radical–radical cross-coupling toward the synthesis of asymmetric diaryl thioethers. The preliminary mechanism was revealed by radical-trapping experiments, DFT calculations, and kinetics, etc., indicating that the C–S bond formed through cross-coupling of a thiyl radical and an aryl radical cation. Moreover, the formation of an aryl
A CuI-catalyzed direct access to sulfides from disulfides via C-H bond cleavage of di- or trimethoxybenzene is described. The procedure utilizes O-2 as a clean and cheap oxidant. Direct selenation of the C-H bond also took place under this procedure. Furthermore, the system enables the use of two RS in (RS)(2). Thus, it represents an atom-economical procedure for the synthesis of sulfides and selenides.
Iron-Catalyzed Direct C-H Thiolation of Trimethoxybenzene with Disulfides
An iron-catalyzed thiolation access to sulfides from disulfides via arene C-H bond cleavage of trimethoxybenzene is described. The procedure tolerates methoxyl, fluoro, chloro, bromo, nitro, and heterocyclic groups, using air as the clean and terminal oxidant.
Metal-and Oxidant-Free Electrochemical Synthesis of Aryl Sulfides
A metal- and oxidant-free electrochemical synthesis of aryl sulfides was developed through a C–H sulfidation reaction of arenes and disulfides. Compared with traditional organic synthesis methods, this direct electrochemical approach efficiently generates aryl sulfides under catalyst- and oxidant-free conditions with the superiorities of wide substrate compatibility, mild reaction condition and waster