Sarabia Francisco J, Li Qiankun, Ferreira Eric M
Department of Chemistry, University of Georgia, Athens, GA, 30602, USA.
Angew Chem Int Ed Engl. 2018 Aug 20;57(34):11015-11019. doi: 10.1002/anie.201805732. Epub 2018 Jul 20.
A direct (3+2) cycloaddition between alkenes and vinyl diazo reagents using either Cr or Ru photocatalysis is described. The intermediacy of a radical cation species enables a nucleophilic interception by vinyl diazo compounds, a departure from their traditional electrophilic behavior. A variety of cyclopentenes are synthesized using this method, and experimental insights implicate a direct cycloaddition instead of a cyclopropanation/rearrangement process.
描述了使用Cr或Ru光催化在烯烃和乙烯基重氮试剂之间进行直接的(3 + 2)环加成反应。自由基阳离子物种的中间体使得乙烯基重氮化合物能够进行亲核截获,这与其传统的亲电行为不同。使用该方法合成了多种环戊烯,实验结果表明这是一个直接的环加成反应,而非环丙烷化/重排过程。