Photocatalyst-Free Visible-Light Photoredox Dearomatization of Phenol Derivatives Containing Ketoximes: An Easy Access to Spiropyrrolines
作者:Yongzhen Han、Yunhe Jin、Min Jiang、Haijun Yang、Hua Fu
DOI:10.1021/acs.orglett.9b00372
日期:2019.3.15
A novel and simple visible-light photoredox intramolecular dearomatization of phenol derivatives containing ketoximes leading to spiropyrrolines has been developed. The protocol uses readily available 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as the base and electron-donor, visible light as the light source, and the reaction was performed well at room temperature without need of a photocatalyst. Therefore
已经开发出新颖且简单的可见光光氧化还原分子内脱芳香化作用的含酮肟的苯酚衍生物,从而导致螺吡咯啉。该方案使用现成的1,8-二氮杂双环[5.4.0]十一碳-7-烯(DBU)作为碱和电子给体,可见光作为光源,该反应在室温下进行得很好,不需要光催化剂。因此,本方法应提供合成螺吡咯啉的有用策略。