Functionalized β-keto sulfones were prepared under the synergistic interactions of visible light irradiation, Ru(bpy)3Cl2, oxygen, KI, and NaOAc basic additive.
the optimized reaction conditions. Mechanistic studies indicated that this transformation involved copper‐catalyzedNObond cleavage, activation of a vinyl sp2 CHbond, and CS bond formation. The oxime acetates act as both a substrate and an oxidant, thus the reaction needs no additional oxidants or additives.
<scp>Copper‐Catalyzed</scp>
Aerobic Oxidative Cleavage of Unstrained
<scp>Carbon‐Carbon</scp>
Bonds of 1,
<scp>1‐Disubstituted</scp>
Alkenes with Sulfonyl Hydrazides
carbon‐carbon bond cleavages have emerged as a powerful strategy to complement traditional ionic‐type transformations. However, carbon‐carbon cleavage reaction triggered by alkoxy radical intermediate derived from the combination of alkyl radical and dioxygen, is scarce and underdeveloped. Herein, we report alkoxy radical, which was generated from alkyl radical and dioxygen, mediated selective cleavage of unstrained
Photoinduced rearrangement of vinyl tosylates to β-ketosulfones
作者:Lili Xie、Xiaomeng Zhen、Shuping Huang、Xiaolong Su、Mai Lin、Yi Li
DOI:10.1039/c7gc01467h
日期:——
We developed a photoinduced radical fragmentation and rearrangement of vinyl tosylates that enables efficient formation of -ketosulfones. The process is based on photoinitiated homolysis of vinyl tosylate to release sulfinyl radical from the tosyl group of and subsequent addition of sulfinyl radical to another vinyl tosylate form the desired -ketosulfones. This simple protocol features board scope
NHC-Catalyzed Synthesis of α-Sulfonyl Ketones via Radical-Mediated Sulfonyl Methylation of Aldehydes
作者:Chaolei Liu、Zheng Liang、Ayisenbati Jialingbieke、Jian Gao、Ding Du
DOI:10.1021/acs.orglett.3c00734
日期:2023.4.21
An N-heterocyclic carbene (NHC)-catalyzed facile assembly of α-sulfonyl ketones has been successfully developed through a radical-mediated sulfonyl methylation of readily available aldehydes. This protocol involves the effective single-electron transfer reduction of α-iodosulfones by NHC-bound Breslow intermediates, thus allowing a subsequent radical–radical coupling to afford the target compounds