Electrochemical Radical–Radical Cross-Coupling Approach between Sodium Sulfinates and 2<i>H</i>-Indazoles to 3-Sulfonylated 2<i>H</i>-Indazoles
作者:Wansoo Kim、Hun Young Kim、Kyungsoo Oh
DOI:10.1021/acs.orglett.0c02144
日期:2020.8.21
A direct cross-coupling between sodium sulfinates and 2H-indazoles has been developed under electrochemical conditions. The utilization of a graphite anode and platinum cathode in an undivided cell with a constant current of 7 mA allowed the concurrent oxidations of sulfinates and 2H-indazoles to sulfonyl radical and radical cationic 2H-indazoles, facilitating the direct radical–radical coupling strategy
Visible-Light-Promoted Thiyl Radical Generation from Sodium Sulfinates: A Radical–Radical Coupling to Thioesters
作者:Ganganna Bogonda、Dilip V. Patil、Hun Young Kim、Kyungsoo Oh
DOI:10.1021/acs.orglett.9b01218
日期:2019.5.17
available starting materials: acid chlorides and sodium sulfinates. The facile generation of acyl radical species under the visible light photoredox conditions allows the formation of thiylradical species from sodium sulfinates via multiple single electron transfer reactions, where the final acyl radical-thiyl radical coupling has been accomplished. The direct radical–radical coupling strategy offers a mild
Metal-free, high yielding synthesis of unsymmetrical biaryl, bi(heteroaryl), aryl vinyl, aryl alkyl sulfones via coupling of aryne with sulfinic acid salts
作者:Sravan Kumar Aithagani、Kushalava Reddy Yempalla、Gurunadham Munagala、Ram A. Vishwakarma、Parvinder Pal Singh
DOI:10.1039/c4ra07370c
日期:——
Here, we report a metal-free, high yielding method for the synthesis of unsymmetrical biaryl sulfones via coupling of aryne with sulfinic acid salts. The optimized condition also works efficiently for bi(heteroaryl), arylvinyl and aryl alkyl sulfones. The present method took comparatively shorter reaction times and has good functional group compatibility.
AN IMPROVED PROCEDURE FOR THE PREPARATION OF N-ARYL SUBSTITUTED 4<i>H</i>-1,4-BENZOTHIAZINE 1,1-DIOXIDE DERIVATIVES
作者:Simon E. Lopez、M. Valentina Godoy、Neudo Urdaneta、Monica Rosales
DOI:10.1080/10426500008044994
日期:2000.1
Abstract An improved procedure for the synthesis of N-aryl substituted 4H-1,4-benzothiazine 1,1-dioxide 2-carboxylic acid-esters derivatives is reported. In this new, efficient methodology. silver nitrate was used as a catalyst for the cyclization of N-aryl-phenylsulfonyl-acrylates 6–11 using potassium carbonate in dimethylformamide to the corresponding title compounds in high yields.
A direct C(sp3)–H sulfinylation reaction of alkanes with sulfinyl sulfones via decatungstate photocatalysis is reported. The sulfinyl sulfones generated in situ from sulfinates in the presence of an acylating reagent were able to trap the alkyl radicals that were produced via the photoinduced direct hydrogen atom transfer of alkanes, leading to a range of sulfoxides. This radical sulfinylation process