Synthesis of β-Keto Sulfones by a Catalyst-Free Reaction of Aryldiazonium Tetrafluoroborates, Sulfur Dioxide, and Silyl Enol Ethers
作者:Tianshuo Liu、Danqing Zheng、Yechun Ding、Xiaona Fan、Jie Wu
DOI:10.1002/asia.201601617
日期:2017.2.16
reaction of aryldiazonium tetrafluoroborates and sulfur dioxide with silyl enol ether under catalyst‐ and additive‐free conditions has been realized. This reaction proceeds efficiently at room temperature 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
在无催化剂和无添加剂的条件下,已经实现了一种绿色的方法,该方法通过使四氟硼酸芳基重氮与二氧化硫与甲硅烷基烯醇醚反应来生成β-酮砜。该反应在室温下有效地进行,并在半小时内完成。在反应过程中,芳基重氮鎓四氟硼酸盐与DABCO处理⋅(SO 2)2(DABCO = 1,4-二氮杂双环[2.2.2]辛烷),以提供一个磺酰基团作为关键中间体,其然后启动变换。避免使用氧化剂或金属催化剂,DABCO的存在在反应中也起着重要作用。