A versatile palladium-catalyzed cyclization/cross-coupling/electrocyclization strategy for the synthesis of fused bi- and tricyclic ring systems is described. Excellent yields of the polycyclic products are obtained with a range of tethering ring sizes and functionality, including an unprecedented 5,6,4,5-fused tetracycle. The reaction mechanism features two unusual palladium-mediated isomerizations
描述了一种通用的
钯催化的环化/交叉偶联/电环化策略,用于合成稠合的双环和
三环系统。通过一系列的束缚环大小和功能性(包括前所未有的5,6,4,5-稠合四环),可获得优异的多环产物收率。在电环化之前,反应机理具有两个不同寻常的
钯介导的异构化作用。