A divergent strategy for the facile preparation of various enantioenriched phenylthio-substituted lactones was developed based on Lewis base/Brønsted acid co-catalyzed thiolation of homoallylic acids. The acid-controlled regiodivergent cyclization (6-endo vs. 5-exo) and acid-mediated stereoselective rearrangement of phenylthio-substituted lactones were explored. Experimental and computational studies
基于路易斯碱/布朗斯台德酸共催化的均烯丙基酸的硫醇化反应,开发了一种简便制备各种对映体富集的苯硫基取代的内酯的策略。探索了酸控制的区域发散环化(6-endo vs. 5-exo)和苯硫基取代的内酯的酸介导的立体选择性重排。进行了实验和计算研究以阐明区域选择性和对映选择性的起源。计算结果表明,CO和CS键的形成可能会同时发生,而不会形成通常认为的催化剂配位的硫鎓离子中间体,而且底物和SPh之间的潜在π-π堆积是对映确定步骤的重要因素。最后,
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.
Structural, Mechanistic, Spectroscopic, and Preparative Studies on the <i>Lewis</i>
Base Catalyzed, Enantioselective Sulfenofunctionalization of Alkenes
作者:Eduard Hartmann、Scott E. Denmark
DOI:10.1002/hlca.201700158
日期:2017.9
with the spectroscopic identification of putative thiiranium ion intermediates generated in the enantiodetermining step. The structural insights gleaned from these studies informed the design of new catalyst architectures to improve enantioselectivity. In addition, structural modification of the sulfenylating agents had a significant and salutary effect on the enantioselectivity of sulfenofunctionalization
bifunctional quaternary phosphonium bromides possessing an amide moiety were designed for the highlyenantioselectivesulfenylation and chlorination of β-ketoesters under base-free phase-transfer conditions. The tuning of an amide moiety of the catalyst was crucial to achieve high reactivity and enantioselectivity.