Intramolecular [2 + 2] Cycloaddition of Isocarbostyrils Catalyzed by an Iridium Visible-Light Photocatalyst
作者:Noriyoshi Arai
DOI:10.1021/acs.joc.3c00059
日期:——
stereoselectively in high yields. Loading 1 mol % of the catalyst was enough to obtain high yields of the products in convenient reaction time in many cases. The reaction likely proceeds through stepwise [2 + 2] cycloaddition via a triplet biradical intermediate.
在铱光催化剂存在下,通过发射 455 nm 光的 LED 照射N -(ω-烯基)异喹啉,以高产率立体选择性地得到相应的环丁烷稠合苯并 [ b ] 喹啉衍生物。在许多情况下,负载 1 mol% 的催化剂足以在方便的反应时间内获得高产率的产品。该反应可能通过三重双自由基中间体逐步进行 [2 + 2] 环加成。
Photoredox streamlines electrocatalysis: photoelectrosynthesis of polycyclic pyrimidin-4-ones through carbocyclization of unactivated alkenes with malonates
base hybrid system for the synthesis of polycyclic pyrimidin-4-ones through dehydrogenative carbocyclization of unactivated alkenes with simple malonates under very mild and external-oxidant-free conditions. The reaction exhibits a good functional-group tolerance and is amenable for a gram-scale synthesis, and the sunlight could serve as the light source. Mechanistic studies suggest that the synergistic