Odorless, Regioselective Synthesis of Diaryl Sulfides and α-Thioaryl Carbonyls from Sodium Arylsulfinates <i>via</i>
a Metal- Free Radical Strategy in Water
作者:Ya-mei Lin、Guo-ping Lu、Gui-xiang Wang、Wen-bin Yi
DOI:10.1002/adsc.201600846
日期:2016.12.22
Regioselective arylthiolations of aromatic amines, arenols and ketones via C–H bond functionalization have been achieved with I2 and PPh3 in an aqueous system, whereby arylsulfenyl radicals are in situ generated from odorless sodium arylsulfinates. The arylsulfenyl radicals can react with free anilines containing electron‐withdrawing groups and complex substrates (estrone and progesterone). Further
The reaction of a γ,γ,γ-trifluoro-β-(p-methoxyphenylamino) sulfoxide with trifluoroacetic anhydride under Pummerer conditions occurs in an abnormal fashion, providing an excellent yield of the cyclic six-membered sulfonium salt arising from intramolecular interception of the usual trifluoroacetoxy-sulfonium intermediate by the electron rich p-methoxyphenyl group.
Metal-Free Iodine-Catalyzed Direct Arylthiation of Substituted Anilines with Thiols
作者:Daoshan Yang、Kelu Yan、Wei Wei、Jing Zhao、Mengqi Zhang、Xuguang Sheng、Guoqing Li、Shenglei Lu、Hua Wang
DOI:10.1021/acs.joc.5b00540
日期:2015.6.19
Iodine-catalyzed direct arylthiation of substituted anilines for the synthesis of various diaryl sulfides has been developed under metal- and solvent-free conditions. The present method uses readily available thiols as the arylthiation reagents, and environmentally friendly and inexpensive I-2 as the catalyst. Importantly, no base or ligand was necessary. Such a simple, efficient, and economical transformation provides an attractive approach to various diaryl sulfides in good to excellent yields.
Synthesis of asymmetrical thioethers with sulfinamides as the sulfenylation agent under metal-free conditions
Using sulfinamides as a new reagent for preparation of asymmetrical thioethers has been developed undermetal-freeconditions. The reactions proceeded smoothly without the use of stinky thiophenol, highly toxic sulfonyl chloride or oxidant. Such a simple, efficient transformation provides an attractive approach to various diaryl sulfides in good to excellent yields.