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.
Heterogeneous copper‐catalyzed oxidative coupling of oxime acetates with sodium sulfinates: An efficient and practical synthesis of β‐keto sulfones
作者:Jianhui Xia、Xue Huang、Shengyong You、Mingzhong Cai
DOI:10.1002/aoc.5001
日期:2019.8
An efficient and practical route to β‐keto sulfones has been developed through heterogeneous oxidativecoupling of oxime acetates with sodiumsulfinates by using an MCM‐41‐supported Schiff base‐pyridine bidentate copper (II) complex [MCM‐41‐Sb,Py‐Cu (OAc)2] as the catalyst and oxime acetates as an internal oxidant, followed by hydrolysis. The reaction generates a variety of β‐keto sulfones in good
<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
Photocatalytic Aerobic Oxysulfonylation of Alkynes to Access
<scp>β‐Keto</scp>
Sulfones Catalyzed by
<scp>
OVs‐N‐Nb
<sub>2</sub>
O
<sub>5</sub>
</scp>
作者:Tao Song、Yinpan Zhang、Chun Wang、Yafei Li、Yong Yang
DOI:10.1002/cjoc.202200410
日期:2022.11.15
photocatalyst for radical-mediated oxidative oxysulfonylation of alkynes to β-ketosulfones under environmentally benign conditions. The oxygen vacancy-rich semiconductor Nb2O5 (labeled as OVs-N-Nb2O5) could efficiently catalyze a wide range of alkynes, especially for those bearing electron-deficient substituents or internal alkynes, to their corresponding β-ketosulfones in good to high yields with good tolerance
在此,我们报道了一种新型多相光催化剂,用于在环境友好条件下自由基介导的炔烃氧化氧磺酰化为 β-酮砜。富含氧空位的半导体 Nb 2 O 5(标记为 OVs-N-Nb 2 O 5)可以有效地催化多种炔烃,尤其是那些带有缺电子取代基或内部炔烃的炔烃,生成相应的 β-酮砜在可见光照射下具有良好至高产率,并且对多种官能团具有良好的耐受性。通过该程序还实现了甾体化合物的后期修饰和生物活性分子的合成,突出了其实际应用的潜力。同时,光催化剂OVs-N-Nb2 O 5在连续循环中表现出出色的催化稳定性,而活性和选择性没有明显损失。通过对照实验和理论计算清楚地揭示了氧空位对提高反应活性和选择性的关键作用。