Abstract 3-CF3S substituted thioflavones and benzothiophenes were achieved via the reactions of AgSCF3 with methylthiolated alkynones and alkynylthioanisoles, respectively, promoted by persulfate. This protocol possesses good functional group tolerance and high yields. Mechanistic studies suggested that a classic two-step radical process was involved, which includes addition of CF3S radical to triple
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 new method for the directsynthesis of 3-phosphinoylbenzothio(seleno)phenes has been achieved through an Ag-mediated radical addition–cyclization of 2-alkynylthio(seleno)anisoles with secondary phosphine oxides in good yields under mild conditions. In this single reaction, benzenethiophene or benzeneselenophene skeleton, C(sp2)–P and C(sp2)–S bonds can be constructed with the cleavage of the C(sp3)–S
B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed cyclization of alkynes: direct synthesis of 3-silyl heterocyclic compounds
作者:Mengxing Li、Ting Wang、Zhenyu An、Rulong Yan
DOI:10.1039/d0cc04314a
日期:——
An efficient one-pot strategy for easy access to 3-silyl heterocyclic compounds was developed via a B(C6F5)3-catalyzed cycloaddition reaction of o-(1-alkynyl)(thio)anisoles or o-(1-alkynyl)-N-methylaniline.
Electrochemical synthesis of sulfonated benzothiophenes using 2-alkynylthioanisoles and sodium sulfinates
作者:Ming-Ming Zhang、Yu Sun、Wan-Wan Wang、Kang-Kang Chen、Wen-Chao Yang、Lei Wang
DOI:10.1039/d1ob00079a
日期:——
Electrochemicalsulfonylation/cyclization of 2-alkynylthioanisoles with sodiumsulfinates was developed under catalyst-, external oxidant- and metal-free conditions. The electrosynthesis provides sustainable and efficient access to 3-sulfonated benzothiophenes with good substrate scope and functional group tolerance. This cascade radical process has been triggered through a sulfonyl radical addition