作者:C. Eric Schwartz、Dennis P. Curran
DOI:10.1021/ja00181a033
日期:1990.12
tandem radical cyclization strategy for the construction of the congested angular triquinane portion of the naturally occurring tetraquinane crinipellin A. The preparation and cyclization of three 5,5-disubstituted-1,4-dimethyl-1,3-cyclopentadienes are detailed. This cyclization strategy results in a 1,4-functionalization of the cyclopentadiene nucleus, mediated by an allylic radical cyclization. Each
我们描述了一种新的串联自由基环化策略,用于构建天然四喹烷 crinipellin A 的拥挤角三喹烷部分。 详细介绍了三个 5,5-二取代-1,4-二甲基-1,3-环戊二烯的制备和环化. 这种环化策略导致环戊二烯核的 1,4-官能化,由烯丙基环化介导。每次串联环化以 5:1 的比例产生两种非对映体三喹烷。次要的非对映异构体对 crinipellin A 的 D 环异丙基具有正确的相对立体化学。还描述了与自由基环化平行的串联阳离子环化