The First Broad Application of Alkynyl Sulfides as Dienophiles in Cobalt(I)-Catalyzed Diels−Alder Reactions
作者:Gerhard Hilt、Steffen Lüers、Klaus Harms
DOI:10.1021/jo0302915
日期:2004.2.1
The cobalt(I)-catalyzed Diels−Alder reaction of nonactivated aryl alkynyl sulfides with acyclic 1,3-dienes generates dihydroaromatic vinyl sulfides under very mild reaction conditions, and these products can be oxidized with mild oxidants to the corresponding diaryl sulfides in good overall yields. The steric and electronic effects of substituents on the aryl, as well as on the alkynyl, moieties of
未活化的芳基炔硫醚与无环1,3-二烯的钴(I)催化的Diels-Alder反应在非常温和的反应条件下生成二氢芳族乙烯基硫醚,这些产物可以用温和的氧化剂氧化成相应的二芳基硫醚产量。讨论了芳基炔基硫醚的芳基以及炔基上的取代基的空间和电子效应。尽管钴催化剂体系在将炔基硫醚转化为Diels-Alder加合物方面非常有效,但在类似温和的反应条件下,相应的芳基炔基亚砜和砜的转化仅产生了适中的所需加合物收率。