Metal-free tetra-n-butylammonium bromide-mediated aerobic oxidative synthesis of β-ketosulfones from styrenes
作者:Xin Wan、Kai Sun、Guisheng Zhang
DOI:10.1007/s11426-016-0284-2
日期:2017.3
An efficient and broadly applicable protocol for the aerobic coupling of styrenes with sulfonylhydrazides has been developed that affords β-ketosulfones bearing various functional groups in moderate to excellent yields. The preliminary experimental results support the involvement of active benzyl radical species, and a radical pathway was therefore proposed for the reaction.
β-hydroxysulfones from inexpensive and readily available terminal alkynes and sodium sulfinates via a consecutive one-pot reaction in an aqueous medium under mild conditions is described. The intermediates, β-ketosulfones, generated from an aerobicoxysulfonylation of terminal alkynes and sodium sulfinates catalyzed by an iron salt in MeOH/H2O (v : v = 3 : 1) at 50 °C, were subsequently reduced by a
描述了在温和条件下在水性介质中通过连续的一锅反应由廉价且容易获得的末端炔烃和亚磺酸钠高度对映选择性合成β-羟基砜的方法。随后在50°C下由铁盐在MeOH / H 2 O(v:v = 3:1)中催化的末端炔烃和亚磺酸钠的需氧氧磺酰化反应生成的中间体β-酮砜HCOONa作为氢源的催化不对称转移加氢反应。以高收率和高达99.9%ee值获得了各种手性β-羟基砜。这种一锅法工艺很容易按比例放大以进行克级合成。
Visible-Light-Induced CS Bond Activation: Facile Access to 1,4-Diketones from β-Ketosulfones
A novel method for the synthesis of 1,4‐diketones from β‐ketosulfones was developed by means of a visible light‐induced CSbondactivation process. Symmetrical and unsymmetrical 1,4‐diketones can be easily prepared in moderate to good yields.
A glucose oxidase-hemoglobin system for efficient oxysulfonylation of alkenes/alkynes in water
作者:Fengxi Li、Jiali Su、Yaning Xu、Jiaxu Liu、Yue Yu、Chunyu Wang、Zhengqiang Li、Chen Li、Lei Wang
DOI:10.1016/j.mcat.2020.111336
日期:2021.1
Dioxygen-Triggered Oxidative Radical Reaction: Direct Aerobic Difunctionalization of Terminal Alkynes toward β-Keto Sulfones
作者:Qingquan Lu、Jian Zhang、Ganglu Zhao、Yue Qi、Huamin Wang、Aiwen Lei
DOI:10.1021/ja4052685
日期:2013.8.7
An unprecedented dioxygen-triggered oxidative radical process was explored using dioxygen as the solely terminal oxidant, realizing aerobic oxidaitve difunctionalization of terminal alkynes toward beta-keto sulfones with high selectivity. Operando IR experiments revealed that pyridine not only acts as a base to successfully surpress ATRA (atom transfer radical addition) process, but also plays a vital role in reducing the activity of sulfinic acids.