Visible‐Light‐Induced Radical Cascade Cyclizations of 1,7‐Enynes with Sulfinic Acids: Direct Access to Sulfonated Chromanes and Sulfonated Tetrahydroquinolines under Metal‐Free Conditions
作者:Qi Liu、Yousheng Mei、Lei Wang、Yongmin Ma、Pinhua Li
DOI:10.1002/adsc.202000846
日期:2020.12.22
Visible‐light‐induced strategy to access sulfonated chromanes and sulfonated 1,2,3,4‐tetrahydroquinolines via a radical cascade cyclization of 1‐(arylethynyl)‐2‐(vinyloxy)benzenes and N‐allyl‐2‐(arylethynyl)anilines with aromatic and aliphatic sulfinic acids has been developed. In the presence of TBHP (7.5 mol%) as an oxidant and Eosin Y (3.0 mol%) as a photocatalyst, the reactions undergo smoothly
可见光诱导策略通过1-(芳基乙炔基)-2-(乙烯基氧基)苯和N-烯丙基-2-(芳基乙炔基)苯胺的自由基级联环化反应来获得磺化的苯并二氢吡喃和磺化的1,2,3,4-四氢喹啉已经开发出具有芳族和脂族亚磺酸的化合物。在TBHP(7.5 mol%)作为氧化剂和曙红Y(3.0 mol%)作为光催化剂的情况下,反应平稳进行,从而在室温下无金属条件下以高收率得到相应的产物。这种转变的特点是TBHP的负载量低,反应条件温和,操作简单,对官能团的耐受性强以及产品收率高。