A metal-free, and environment benign iodine-catalysed protocol has been developed for the regioselectivesynthesis of β-hydroxysulfides in good to excellent yields from easily accessible styrenes and thiophenols. The reaction involves single step CS and CO bonds construction.
HBr/H 2 O 2 -mediated formation of C–S bond with thiosulfates
作者:Rongxing Zhang、Shengzhou Jin、Yuanxing Wan、Sen Lin、Zhaohua Yan
DOI:10.1016/j.tetlet.2018.01.055
日期:2018.2
environmentally-friendly H2O2 as oxidant and HBr as catalyst. Based on the preliminary experimental results, a plausible reaction mechanism was proposed for HBr/H2O2-mediated formation of C–S bond with thiosulfates.
通过HBr / H 2 O 2介导的苯乙烯和4-羟基香豆素的亚磺酰基化反应导致不对称硫化物的形成,一种新颖,有效且绿色的构建C–S键的方案得以开发。使用环境友好的H 2 O 2作为氧化剂和HBr作为催化剂,一步一步制备各种不对称硫化物,并具有中等至良好的收率。根据初步的实验结果,提出了一种可能的反应机理,该反应机理是HBr / H 2 O 2介导的与硫代硫酸盐形成CS键的反应。
Molecular Iodine Catalyzed Hydroxysulfenylation of Alkenes with Disulfides in Aerobic Conditions
molecular-iodine-catalyzed radical reaction. This reaction involves hydroxysulfenylation of alkenes with disulfides in aqueous solution. Air is used as the oxidant without any additives. Control experiments indicated that the oxygen atom of products might come from O2. Both aryl alkenes and aliphatic alkenes were well tolerated in this transformation and afforded the corresponding products in moderate
Three-Component Oxychalcogenation of Alkenes under Metal-Free Conditions: A Tetrabutylammonium Tribromide-Catalyzed System
作者:Jiawei Huang、Xiaoman Li、Liang Xu、Yu Wei
DOI:10.1021/acs.joc.2c02856
日期:2023.3.3
A three-component oxychalcogenation reaction, from alkenes, diselenides/thiophenols, and H2O/alcohols, has been realized herein. Tetrabutylammonium tribromide (TBATB) and dimethylsulfoxide (DMSO) are utilized as the catalyst and the terminal oxidant, respectively, to enable this difunctionalization transformation. The metal-free reaction system shows good functional group compatibility, providing a
本文实现了烯烃、二硒化物/苯硫酚和 H 2 O/醇的三组分氧硫属化反应。四丁基三溴化铵 (TBATB) 和二甲基亚砜 (DMSO) 分别用作催化剂和末端氧化剂,以实现这种双官能化转化。无金属反应体系显示出良好的官能团相容性,为获得β-羟基或β-烷氧基有机硫族化合物提供了统一实用的途径。