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
investigated using the following Michael acceptor -sulfone 2-[(4-methylphenyl)sulfonyl]cyclopent-2-en-1-one, where the addition product was isolated in good yield and as a mixture of two diastereomers. Also, the diastereomers were separable by crystallization, and, based on NMR spectroscopic data, the relative configuration of the formed stereocentres of the isolated diastereomer matched the 9,11-secosterol
Iodine-Catalyzed Selective Synthesis of 2-Sulfanylphenols<i>via</i>Oxidative Aromatization of Cyclohexanones and Disulfides
作者:Wenlei Ge、Xun Zhu、Yunyang Wei
DOI:10.1002/adsc.201300493
日期:2013.10.11
AbstractIodine‐catalyzed intermolecular dehydrogenative aromatizations of six‐membered cyclohexanones for the selective synthesis of 2‐sulfanylphenols have been developed. Both aryl and alkyl disulfides can be used as sulfanylation reagents to give the desired products in good yields under the optimized reaction conditions. The catalytic reaction uses dimethyl sulfoxide or oxygen as the terminal oxidant and avoids the use of transition metal catalysts. In addition, α‐sulfanyl enones could also be obtained via an iodine‐catalyzed oxidative system from simple cyclic ketones using dimethyl sulfoxide as the oxidant.magnified image