一种稳定的二甲基(硫代二甲基)锍四氟硼酸盐用于邻炔基硫代苯甲醚的亲电环化反应,用于合成 2,3-二取代苯并[ b ]噻吩。本文描述的反应以优异的收率与各种取代的炔烃一起工作,并且很容易引入有价值的硫甲基。该反应利用温和的反应条件和环境温度,同时耐受各种功能。为了阐明机理,证明了使用二甲基(硫代二甲基)锍四氟硼酸盐与二苯乙炔的亲电加成反应。
Synthesis of
<scp>3‐Methylthio</scp>
‐benzo[
<i>b</i>
]furans/Thiophenes
<i>via</i>
Intramolecular Cyclization of
<scp>2‐Alkynylanisoles</scp>
/Sulfides Mediated by
<scp>DMSO</scp>
/
<scp>DMSO</scp>
‐
<i>d</i>
<sub>6</sub>
and
<scp>
SOCl
<sub>2</sub>
</scp>
作者:Beibei Zhang、Xiaoxian Li、Xuemin Li、Fengxia Sun、Yunfei Du
DOI:10.1002/cjoc.202000566
日期:2021.4
with SOCl2 and DMSO was conducted to conveniently furnish the biologically interesting 3‐(methylthio)‐benzo[b]furans/thiophenes via intramolecularcyclization. DMSO acts as a solvent as well as a sulfur source and can also be replaced with DMSO‐d6, enabling the incorporation of the SCD3 moiety of DMSO‐d6 to the 3‐position of the heterocyclic frameworks.
进行2-炔基苯甲醚/硫化物与SOCl 2和DMSO的反应以通过分子内环化方便地提供生物学上令人感兴趣的3-(甲硫基)-苯并[ b ]呋喃/噻吩。DMSO充当溶剂,以及作为硫源,也可以用替换DMSO- d 6,使SCD的掺入3 DMSO-的部分d 6到杂环框架的3位上。
Polyynes to Polycycles: Domino Reactions Forming Polyfused Chalcogenophenes
作者:Annaliese S. Dillon、Bernard L. Flynn
DOI:10.1021/acs.orglett.0c00733
日期:2020.4.17
Polyfused chalcogenophenes are prepared in one step through polyelectrophilic cyclization of polyynes using the ambiphilic reagent MeACl (A = S, Se, or Te). Up to four new rings have been generated under mild conditions, including thiophenes, selenophenes, and tellurophenes.