Benziodoxole Triflate as a Versatile Reagent for Iodo(III)cyclization of Alkynes
作者:Bin Wu、Junliang Wu、Naohiko Yoshikai
DOI:10.1002/asia.201701530
日期:2017.12.14
Hyperactive: A benziodoxole triflate promotes iodo(III)cyclization of alkynes tethered to a variety of nucleophilic moieties, affording benziodoxole-appended (hetero)arenes such as benzofurans, benzothiophenes, isocoumarins, indoles, and polyaromatics. These unprecedented (hetero)aryl-IIII compounds are easy to purify, air- and thermally stable, and amenable to various synthetic transformations.
A simple and practical protocol for the synthesis of 3-selanyl-benzo[b]furans mediated by the SelectFluor® reagent was developed. This novel methodology provided a greener alternative to generate 3-substituted-benzo[b]furans via a metal-free procedure under mild conditions. The intramolecular cyclization reaction was carried out employing an electrophilic selenium species generated in situ through
开发了一种简单实用的由 SelectFluor® 试剂介导的3-硒基-苯并[ b ]呋喃合成方案。这种新颖的方法提供了一种在温和条件下通过无金属程序生成 3-取代-苯并[ b ]呋喃的更环保的替代方案。分子内环化反应采用通过 SelectFluor® 和有机二硒化物之间的反应原位产生的亲电硒物质进行。通过异核核磁共振波谱证实了这种亲电硒物质(RSe-F)的形成,并探讨了其反应性。
AgNO2-catalyzed radicalcyclization of 2-alkynylanisoles (or 2-alkynylthioanisoles), Se powder, and arylboronic acids. This method enables the construction of a benzofuran (benzothiophene) ring, two C-Se bonds, and a C-O(S) bond as well as the cleavage of a C-O(S) bond in a single step. Preliminary mechanistic studies imply that the AgNO2-catalyzed cyclization proceeds via an aryl selenium radical intermediate
A Green and Efficient Approach for the Synthesis of 3-Chalcogen Benzo[<i>b</i>]Furans <i>via</i> I<sub>2</sub>-Mediated Cascade Annulation Reaction of 2-Alkynylanisoles at Room Temperature in Water
Abstract An efficient and green aqueous protocol to access 3-chalcogen benzo[b]furan derivatives has been developed. The reaction can proceed via I2-mediated intramolecular annulationreaction of 2-alkynylanisoles with diaryl disulfides (diselenides) in water or undersolvent-freeconditions at room temperature. With the participation of I2, a variety of 3-chalcogen benzo[b]furan derivatives were obtained
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。