A newly designed radical cascade involving N-acyl cyanamides is reported. It builds on aromatic homolytic substitutions as intermediate events and leads to complex heteroaromatic structures via an unprecedented radical migration of a substituent on aryl groups of quinazolinones (hydrogen or alkyl). Mechanistic considerations are detailed, which allowed us to devise fine control over the domino processes
Visible-Light Photoredox Catalyzed Oxidative/Reductive Cyclization Reaction of <i>N</i>-Cyanamide Alkenes for the Synthesis of Sulfonated Quinazolinones
作者:Ping Qian、Yu Deng、Haibo Mei、Jianlin Han、Jie Zhou、Yi Pan
DOI:10.1021/acs.orglett.7b02163
日期:2017.9.15
photocatalytic oxidative/reductive cyclizationreaction of N-cyanamide alkenes with arylsulfinic acids or arylsulfonyl chlorides, which proceeds through C–S, C–C, and C–N bond formations, is reported. This photocatalytic reaction was carried out under mild conditions, which provides a new strategy for the synthesis of sulfonated quinazolinones. Furthermore, a one-pot procedure to achieve terminal alkenes