Photochemical, Metal‐Free Sigmatropic Rearrangement Reactions of Sulfur Ylides
作者:Zhen Yang、Yujing Guo、Rene M. Koenigs
DOI:10.1002/chem.201900597
日期:2019.5.10
Sigmatropic rearrangement reactions constitute one of the most fundamental reactions of carbenes. While state‐of‐the‐art synthetic methods require the use of expensive precious metal catalysts, the application of visible light for the photolysis of α‐aryldiazoacetates is much less investigated and provides an operationally simple entry to carbenes under mild reaction conditions. Herein, we report on
Electrochemical Direct Thiolation of Lactams with Mercaptans: An Efficient Access to
<i>N</i>
‐Acylsulfenamides
作者:Zhaoxin Wei、Renjie Wang、Yonghong Zhang、Bin Wang、Yu Xia、Ablimit Abdukader、Fei Xue、Weiwei Jin、Chenjiang Liu
DOI:10.1002/ejoc.202100924
日期:2021.9.7
A variety of N-acylsulfenamides are produced by the electrochemically enabled cross-coupling of readily available feedstocks under standard conditions. This protocol is practical and has wide substrate scope with good reaction efficiency (38 examples, up to 97 % yield). A possible free radical mechanism is preliminarily demonstrated.
Hydrochloric Acid-Promoted Intermolecular 1,2-Thiofunctionalization of Aromatic Alkenes
作者:Xiaomeng Li、Yunlong Guo、Zengming Shen
DOI:10.1021/acs.joc.7b03263
日期:2018.3.2
and different types of nucleophiles. Importantly, extension of nucleophiles can reach aryl ethers, indoles, and carboxylic acids with good reactivity. This practical and convenient method has broad substrate scope and high yields under metal-free and mild conditions. Furthermore, we achieved conversion and application for making sulfoxide and sulfone by oxidation.
Asymmetric sulfenylation of 3-CF 3 -Oxindoles through organocatalysis with a quinidine derivative
作者:Yidan E、Teng Yuan、Liang Yin、Youjun Xu
DOI:10.1016/j.tetlet.2017.05.015
日期:2017.6
An asymmetric sulfenylation of 3-CF3-oxindoles catalyzed by a quinidine derivative was described. 3-CF3-oxindoles with electro-donating groups led to corresponding products in good yield and with good enantioselectivity while 3-CF3-oxindoles bearing electro-withdrawing groups were not competent substrates due to its significant decomposition at the optimal reaction conditions. As for the sulfenylation
A simple and inherent green photocatalytic approach using commercially available and cheap nBu4NBr with 4-CzIPN was reported to effectively initiate the site-selective α-C(sp3)-H activation of tetrahydrofuran for C-S and C-C cross-couplings.