Oxidative Sulfonylation of Hydrazones Enabled by Synergistic Copper/Silver Catalysis
作者:Jun Xu、Chao Shen、Xian Qin、Jie Wu、Pengfei Zhang、Xiaogang Liu
DOI:10.1021/acs.joc.0c02249
日期:2021.3.5
A copper/silver-cocatalyzed protocol for oxidative sulfonylation of hydrazones is demonstrated. A wide range of β-ketosulfones and N-acylsulfonamides are directly synthesized in moderate to good yields. Our work provides a viable method for scalable preparation of β-ketosulfone derivatives that have found wide applications in the pharmaceutical industry.
reaction of aryldiazonium tetrafluoroborates and sulfur dioxide with silyl enolether under catalyst‐ and additive‐free conditions has been realized. This reaction proceeds efficiently at roomtemperature and goes to completion in half an hour. During the reaction process, aryldiazonium tetrafluoroborate is treated with DABCO⋅(SO2)2 (DABCO=1,4‐diazabicyclo[2.2.2]octane) to provide a sulfonyl radical as
Heterogeneous Carbon Nitrides Photocatalysis Multicomponent Hydrosulfonylation of Alkynes To Access β-Keto Sulfones with the Insertion of Sulfur Dioxide in Aerobic Aqueous Medium
Although hydrosulfonylation of alkynes is an ideal process to generate β-ketosulfones, such an approach is rarely implemented. Here we reported a facile and efficient graphitic carbon nitride (p-g-C3N4) photocatalyzed hydrosulfonylation of alkynes with the insertion of sulfur dioxide in aerobic conditions. Controlled experiments and ESR results indicated both the superoxide radicals and valence band
Rongalite-promoted synthesis of β-keto sulfones via radical cascade reaction
作者:Min-xiao Xu、Kai-ming Zhang
DOI:10.1016/j.mencom.2022.09.019
日期:2022.9
Direct arylsulfonylation of arylethenes with aryl iodides and sodium metabisulfite to access β-keto sulfones is described. In this reaction, rongalite (sodium hydroxymethanesulfinate) and sodium metabisulfite serve as the radical promoter and the sulfur dioxide surrogate, respectively.
I<sub>2</sub>‐Catalyzed/ Mediated C–S and C–I Bond Formation: Solvent‐ and Metal‐free approach for the Synthesis of <i>β</i>‐Keto Sulfones and Branched Sulfones
a solvent- and transition-metal-free, iodine-catalyzed formation of C−S (sulfone) bonds for the synthesis of β-keto sulfones using readily accessible methyl ketones and sulfonyl hydrazides. This study also features the α-functionalization of β-keto sulfones to synthesize β-ketothiosulfones and α-iodo-β-keto sulfones via iodine-catalyzed carbon-sulfide (C−S) bond formation under solvent-free conditions