Photoinduced, Copper-Catalyzed Three-Component Annulation of <i>gem</i>-Dialkylthio Enynes
作者:Jiang Lou、Juan Ma、Bao-Hua Xu、Yong-Gui Zhou、Zhengkun Yu
DOI:10.1021/acs.orglett.0c01645
日期:2020.7.2
Photoinduced, copper-catalyzed three-component radical annulation of gem-dialkylthio enynes, cyclobutanone oxime esters, and boronic acids was achieved, forming highly functionalized aryl thienyl sulfides with both good chemo- and diastereoselectivities. The reaction proceeds through a domino sequence involving cyanoalkyl radical-mediated intramolecular annulation of gem-dialkylthio enyne, alkenyl
实现了光诱导的铜催化的宝石-二烷硫基炔烃,环丁酮肟酯和硼酸的三组分自由基环化反应,形成了高度官能化的芳基噻吩硫醚,具有良好的化学选择性和非对映选择性。该反应通过一个多米诺序列进行,该多米诺序列涉及氰基烷基自由基介导的宝石-二烷硫基烯炔的分子内环化,烯基自由基促进的C(sp 3)-S键断裂以及硫中心自由基俘获的Cu(II)促进的CS交叉耦合。该协议的特点是在一个锅中同时建立氰基烷基,环戊酮和噻吩基团以及一个硫醚CS键,具有宽泛的底物范围和在温和条件下的多功能官能团耐受性。