Electrochemical Reduction of Activated Olefins in Deuterated Solvents. II. A Regioselective Deuteriation Catalytic Process from alpha,beta-Ethylenic Aryl Sulfones.
摘要:
The title compounds were electrochemically reduced in aprotic dimethyl sulfoxide-d(6), acetonitrile-d(3), or organic solvents containing heavy water. When a catalytic amount of charge passed through the cell, alpha-deuteriation of olefins occurred in high yield. Since both chemical and electrochemically formed bases were found to be totally inefficient in the performance of such deuteriation, a radical chain process is tentatively proposed. During attempted total reduction of substrates, tetradeuteriated dimers were isolated, from which information on the reduction mode and coupling process can be obtained.
Iodine-mediated synthesis of (E)-vinyl sulfones from sodium sulfinates and cinnamic acids in aqueous medium
作者:Jian Gao、Junyi Lai、Gaoqing Yuan
DOI:10.1039/c5ra10896a
日期:——
With water as the reaction medium, a green and efficient method has been developed for the synthesis of (E)-vinylsulfones via I2-mediated decarboxylative cross-coupling reactions of sodium sulfinates with cinnamic acids. This synthetic route could effectively avoid the use of toxic organic solvents and transition metal catalysts, and the target products could be obtained with moderate to excellent
Regioselective and stereoselective sulfonylation of alkynylcarbonyl compounds in water
作者:Wenyi Li、Guoxing Yin、Lei Huang、Yan Xiao、Zhimin Fu、Xiu Xin、Fang Liu、Zhizhang Li、Weimin He
DOI:10.1039/c6gc01196a
日期:——
A simple and efficient route for the synthesis of Z-[small beta]-sulfonyl-[small alpha],[small beta]-unsaturated carbonylcompounds by using water as the solvent and hydrogen source is developed.
开发了一种简单有效的途径,以水为溶剂和氢源,合成Z-小β-磺酰基-小α,β-不饱和羰基化合物。
Aerobic copper-catalyzed synthesis of (E)-alkenyl sulfones and (E)-β-halo-alkenyl sulfones via addition of sodium sulfinates to alkynes
作者:Nobukazu Taniguchi
DOI:10.1016/j.tet.2014.01.071
日期:2014.3
(E)-alkenyl sulfones. When a CuCl catalyst was employed, the hydrosulfonylation proceeded syn-selectively, and (E)-alkenyl sulfones were synthesized in excellent yields. In contrast, the reaction using CuI catalyst produced (E)-β-haloalkenyl sulfones anti-selectively in the presence of potassium halides. Furthermore, the (E)-β-bromoalkenyl sulfones are possible to convert into various alkenyl sulfones by Suzuki–Miyaura
A stereoselective synthesis of (E)-vinyl sulfones has been developed via electrochemical oxidative N–S bond cleavage of aromatic sulfonylhydrazides, followed by cross-coupling reactions with cinnamic acids to form the C–S bond. The protocol proceeded smoothly to afford (E)-vinyl sulfones in good yields with wide substrate scope under metal-free and halogen-free conditions.
Metal-free Oxidative Coupling of Aromatic Alkenes with Thiols Leading to (<i>E</i>)-Vinyl Sulfones
作者:Leilei Wang、Huilan Yue、Daoshan Yang、Huanhuan Cui、Minghui Zhu、Jinming Wang、Wei Wei、Hua Wang
DOI:10.1021/acs.joc.7b00994
日期:2017.7.7
A facile I2O5-mediated direct oxidative coupling of aromatic alkenes with thiols toward vinyl sulfones has been developed under metal-free conditions. This methodology provides a convenient and efficient approach to various (E)-vinyl sulfones from readily available starting materials with excellent regioselectivity. The present oxidative coupling reaction, not only expands the scope of functionalization
在无金属条件下,已经开发出一种简便的由I 2 O 5介导的芳香族烯烃与硫醇向乙烯基砜的直接氧化偶合的方法。该方法学提供了一种简便有效的方法,可从易于获得的起始材料中以优异的区域选择性来制备各种(E)-乙烯基砜。目前的氧化偶合反应不仅扩大了烯烃与硫醇的官能化范围,而且使其成为对(E)-乙烯基砜的传统合成方法的实用而有力的补充。