三氟甲磺酸酐与2-氯吡啶共介串联活化、分子内芳香族亲电加成以及α-酰基磺酰甲基锍螺环中间体的1,2-磺酰基转移实现了2-烷基/芳基硫代苯并[ b ]噻吩1,1-的高效合成二氧化碳。失活的磺酰基通过原位攻击决定亲电加成的位点选择性,而随后的 S-迁移控制区域选择性。一些 2-甲硫基苯并[ b ]噻吩 1,1-二氧化物在固态及其溶液中表现出荧光特性。
the optimized reaction conditions. Mechanistic studies indicated that this transformation involved copper‐catalyzedNObond cleavage, activation of a vinyl sp2 CHbond, and CS bond formation. The oxime acetates act as both a substrate and an oxidant, thus the reaction needs no additional oxidants or additives.
Photoinduced rearrangement of vinyl tosylates to β-ketosulfones
作者:Lili Xie、Xiaomeng Zhen、Shuping Huang、Xiaolong Su、Mai Lin、Yi Li
DOI:10.1039/c7gc01467h
日期:——
We developed a photoinduced radical fragmentation and rearrangement of vinyl tosylates that enables efficient formation of -ketosulfones. The process is based on photoinitiated homolysis of vinyl tosylate to release sulfinyl radical from the tosyl group of and subsequent addition of sulfinyl radical to another vinyl tosylate form the desired -ketosulfones. This simple protocol features board scope
Chemoselective one-pot synthesis of β-keto sulfones from ketones
作者:Vikas S. Rawat、Perla L. M. Reddy、Bojja Sreedhar
DOI:10.1039/c3ra45547e
日期:——
A practical method to synthesize substituted β-keto sulfones directly from ketones at room temperature has been developed. This method involves the nucleophilic addition of a base generated enolate to sulfonyl iodide. The reaction shows high chemoselectivity for the addition of a sulfonyl group to an α-carbon over a hydroxyl group. In addition, the given protocol provides good to excellent yields of β-keto sulfones under mild reaction conditions. Moreover, the regiochemical aspect of the protocol is also explored.
Electrochemical Synthesis of β-Ketosulfones from Switchable Starting Materials
作者:Issa Yavari、Sina Shaabanzadeh
DOI:10.1021/acs.orglett.9b04221
日期:2020.1.17
A synthesis of β-ketosulfones via sulfination of aryl methyl ketones and aryl acetylenes with sodium sulfinates under mild electrochemical conditions, in moderate to good chemical yields, is described. In particular, an electrochemical sulfination reaction of alkynes with sulfinate salts has never been explored. An environmentally friendly characteristic of this reaction is that it uses electricity
β-ketosulfones and diselenides as the material source. This benign protocol permits access to a broad spectrum of α-aryl(alkyl) seleno-β-ketosulfones in high yields with outstanding functional group compatibility. Distinct advantages of this protocol over all previous methods encompass the utilization of base and air as an oxidant, room temperature, and enhanced green chemistry matrices.