Visible‐Light‐Promoted Ring‐Opening Alkynylation, Alkenylation, and Allylation of Cyclic Hemiacetals through β‐Scission of Alkoxy Radicals
作者:Jiang‐Ling Shi、Zixuan Wang、Rui Zhang、Yuankai Wang、Jianbo Wang
DOI:10.1002/chem.201901762
日期:2019.7.5
The alkoxy radicals that are derived from cyclic hemiacetals have been generated through the visible‐light‐promoted reaction of the corresponding N‐alkoxyphthalimides with Hantzsch ester as the reductant. The alkoxy radicals subsequently undergo β‐scission of the C−C bond to generate carbon‐centered radicals, which are trapped by alkynyl‐, alkenyl‐, or allylsulfones.
环状半缩醛衍生的烷氧基是通过相应的N烷氧基邻苯二甲酰亚胺与Hantzsch酯作为还原剂的可见光促进反应而生成的。随后,烷氧基自由基经历C-C键的β断裂,从而生成以碳为中心的自由基,这些自由基被炔基,烯基或烯丙基砜所捕获。