Au-Catalyzed Tandem Cyclization/[1,2]-Alkyl Migration Reaction of Epoxy Alkynes: Synthesis of Spiropyranones
作者:Xing-Zhong Shu、Xue-Yuan Liu、Ke-Gong Ji、Hui-Quan Xiao、Yong-Min Liang
DOI:10.1002/chem.200800194
日期:2008.6.9
A novel gold-catalyzed tandem cyclization/[1,2]-alkyl migration process of epoxy alkynes to spiropyranones has been discovered. From this process, the construction of adjacent multiple stereocenters with a new quaternary carbon atom is achieved. The gold-catalyzed domino process is stereospecific with respect to the migrating carbon atom. A type of unusual C-C bond cleavage of epoxide systems has also
已发现环氧炔烃向螺并吡喃酮的新型金催化串联环化/ [1,2]-烷基迁移过程。通过该过程,实现了具有新的季碳原子的相邻多个立体中心的构建。对于迁移的碳原子,金催化的多米诺骨牌过程是立体定向的。还发现了一种环氧化物系统的不寻常的CC键断裂,这种断裂可导致两个Z烯烃和一个羰基官能团一步形成,且立体选择性优异。此外,可以在最简单和最便宜的金催化剂[NaAuCl(4)]。2H(2)O的情况下以低催化剂负载量实现这种有效的多米诺骨牌工艺。