This paper describes a novel palladium-catalyzedoxidativecyclization of bromoalkynes with N-allylamines via cascade formation of C-N and C-C bonds. During this process, the bromine atom was retained to form 3-bromo-pyrroles, which can undergo the subsequent structural modifications.
Palladium-Catalyzed Oxidative CC Bond Cleavage Cyclization of Biaryl-2-amines with Alkenes Involving CH Olefination and Carboamination
作者:Yan-Yun Liu、Ren-Jie Song、Cui-Yan Wu、Lu-Bin Gong、Ming Hu、Zhi-Qiang Wang、Ye-Xiang Xie、Jin-Heng Li
DOI:10.1002/adsc.201100651
日期:2012.2
A new, general method for the synthesis of phenanthridines has been developed by palladium-catalyzedoxidative remote CH olefination–carboamination–CC bondcleavage tandem reaction. It is noteworthy that alkenes are used as the one-carbon resources for this tandem reaction.
meta-Thermocycloadditions of benzene rings was realized for the first time. Distinct to the meta-photocycloadditions, this reaction was proposed to proceed via [4π+2π] cycloadditions of Wheland intermediates from the electrophilic dearomatization of benzene rings. A broad spectrum of readily available C(sp2)-rich aniline-tethered enynes were transformed into C(sp3)-rich 3D complex polycyclic architectures