Synthesis of β-Keto Sulfones<i>via</i>Coupling of Aryl/Alkyl Halides, Sulfur Dioxide and Silyl Enolates through Metal-Free Photoinduced C-X Bond Dissociation
作者:Xinxing Gong、Yechun Ding、Xiaona Fan、Jie Wu
DOI:10.1002/adsc.201700525
日期:2017.9.4
sulfonylative coupling of aryl/alkyl halides, DABCO⋅(SO2)2 (1,4‐diazabicyclo[2.2.2]octane‐sulfur dioxide), and silyl enolates under metal‐free conditions has been developed, giving rise to β‐keto sulfones in good yields. This transformation proceeds smoothly at room temperature under ultraviolet irradiation with good tolerance of various functional groups. Aryl iodides/bromides and alkyl halides are all good
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