Preparation of optically active ortho-chloro- and ortho-bromophenyl sulfoxides
摘要:
The preparation of the diastereomerically pure menthyl (S)-2-chloro- and (S)-2-bromophenyl sulfinates by esterification of the corresponding sulfinic acids with ( 1 R,2S,5R)- (-)-menthol and recrystallization/epimerization is reported. The two sulfinates have been converted into enantiomerically pure aryl, vinyl and alkyl sulfoxides by reaction with organomagnesium reagents. These sulfoxides are useful chiral auxiliaries to control the stereochemical outcome of radical reactions. (C) 1999 Elsevier Science Ltd. Ail rights reserved.
Electrochemical Oxidative Cross‐Coupling Reaction to Access Unsymmetrical Thiosulfonates and Selenosulfonates
作者:Xiaofeng Zhang、Ting Cui、Yanghao Zhang、Weijin Gu、Ping Liu、Peipei Sun
DOI:10.1002/adsc.201900047
日期:2019.4.23
The electrochemical oxidativecross‐dehydrogenativecoupling of arylsulfinic acids with thiophenols was achieved via a radical process. A wide range of arylsulfinic acids and substituted thiophenols were found to be tolerated, providing unsymmetrical thiosulfonates in good to excellent yields. This electrochemical method can also be used for the reaction of arylsulfinic acids with disulfides or diselenides
Visible-light initiated oxidative cyclization of phenyl propiolates with sulfinic acids to coumarin derivatives under metal-free conditions
作者:Wenchao Yang、Shuai Yang、Pinhua Li、Lei Wang
DOI:10.1039/c5cc00878f
日期:——
A visible-light initiated oxidative cyclization of phenyl propiolates with sulfinic acids has been developed at room temperature under metal-free conditions.
已在室温下无金属条件下开发了苯基丙炔酸酯与亚砜酸的可见光引发氧化环化反应。
Microwave-Accelerated Pd-Catalyzed Desulfitative Direct C2-Arylation of Free (NH)-Indoles with Arylsulfinic Acids
作者:Tao Miao、Pinhua Li、Guan-Wu Wang、Lei Wang
DOI:10.1002/asia.201300913
日期:2013.12
and efficientdirectC2‐arylation of free (NH)‐indoles with arylsulfinic acids proceeded through a microwave‐accelerated palladium‐catalyzed desulfitation reaction. By using PdCl2 as a catalyst, silver acetate as an oxidant, and H2SO4 as an additive, arylsulfinic acids with both electron‐donating and electron‐withdrawing groups underwent desulfitative coupling with an array of free (NH)‐indoles, thereby
游离(NH)吲哚与芳基亚磺酸的快速有效的直接C2-芳基化反应是通过微波促进的钯催化的脱硫反应进行的。通过使用PdCl 2作为催化剂,乙酸银作为氧化剂,H 2 SO 4作为添加剂,具有给电子基团和吸电子基团的芳基亚磺酸与一系列游离的(NH)吲哚进行脱硫偶联,从而有选择地提供高收率的C2-芳基吲哚。
Visible‐Light‐Induced Radical Cascade Cyclizations of 1,7‐Enynes with Sulfinic Acids: Direct Access to Sulfonated Chromanes and Sulfonated Tetrahydroquinolines under Metal‐Free Conditions
作者:Qi Liu、Yousheng Mei、Lei Wang、Yongmin Ma、Pinhua Li
DOI:10.1002/adsc.202000846
日期:2020.12.22
Visible‐light‐induced strategy to access sulfonated chromanes and sulfonated 1,2,3,4‐tetrahydroquinolines via a radical cascade cyclization of 1‐(arylethynyl)‐2‐(vinyloxy)benzenes and N‐allyl‐2‐(arylethynyl)anilines with aromatic and aliphatic sulfinic acids has been developed. In the presence of TBHP (7.5 mol%) as an oxidant and Eosin Y (3.0 mol%) as a photocatalyst, the reactions undergo smoothly