Tandem Visible Light-Mediated Radical Cyclization–Divinylcyclopropane Rearrangement to Tricyclic Pyrrolidinones
摘要:
Visible light promoted single electron reduction of bromocyclopropyl cyclization scaffolds enabled by photoredox catalysis initiates a novel tandem radical cyclization/sigmatropic rearrangement to generate tricyclic pyrrolidinones having considerable molecular complexity from simple, readily available starting materials. Furthermore, subtle variations to substrate structure afford a wide array of reaction diversity.
Tandem Visible Light-Mediated Radical Cyclization–Divinylcyclopropane Rearrangement to Tricyclic Pyrrolidinones
作者:Joseph W. Tucker、Corey R. J. Stephenson
DOI:10.1021/ol202178t
日期:2011.10.21
Visible light promoted single electron reduction of bromocyclopropyl cyclization scaffolds enabled by photoredox catalysis initiates a novel tandem radical cyclization/sigmatropic rearrangement to generate tricyclic pyrrolidinones having considerable molecular complexity from simple, readily available starting materials. Furthermore, subtle variations to substrate structure afford a wide array of reaction diversity.
Tin-free radical cyclization reactions initiated by visible light photoredox catalysis
作者:Joseph W. Tucker、John D. Nguyen、Jagan M. R. Narayanam、Scott W. Krabbe、Corey R. J. Stephenson
DOI:10.1039/c0cc00981d
日期:——
Herein, we report an advancement in the application of visiblelight photoredox catalysts in a classic free radicalmediated reaction, cyclization onto unactivated pi-systems. The reactive radical intermediate is generated by the single electron reduction of an activated C-Br bond by an electron-rich redox catalyst afforded by a visiblelight induced catalytic cycle.