Radical alkylations of activated alkyl iodides and bromides were achieved usingvinyltriflates in the presence of hexadimethyltin, whereas those of unactivated C-H bonds usingvinyltriflates proceeded cleanly under tin-free conditions.
Photoredox-Catalyzed Generation of Sulfamyl Radicals: Sulfonamidation of Enol Silyl Ether with Chlorosulfonamide
作者:Qiyu Luo、Runyu Mao、Yan Zhu、Yonghui Wang
DOI:10.1021/acs.joc.9b02062
日期:2019.11.1
A novel and practical photoredox-catalyzed generation of sulfamyl radicals followed by radical sulfonamidation of enolsilylether has been described. Diverse functionalized β-ketosulfonamides were prepared in modest to excellent yields under mild and economic reaction conditions through the present catalytic protocol. Furthermore, the methodology developed provides an efficient and convenient approach
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.