Stereoselective Synthesis of Cyclohepta[
<i>b</i>
]indoles by Visible‐Light‐Induced [2+2]‐Cycloaddition/retro‐Mannich‐type Reactions
作者:Xin‐Peng Mu、Yuan‐He Li、Nan Zheng、Jian‐Yu Long、Si‐Jia Chen、Bing‐Yan Liu、Chun‐Bo Zhao、Zhen Yang
DOI:10.1002/anie.202101104
日期:2021.5.10
A novel method for the concise synthesis of cyclohepta[b]indoles in high yields was developed. The method involves a visible‐light‐induced, photocatalyzed [2+2]‐cycloaddition/ retro‐Mannich‐type reaction of enaminones. Experimental and computational studies suggested that the reaction is a photoredox process initiated by single‐electron oxidation of an enaminone moiety, which undergoes subsequent cyclobutane