described. The synthesis capitalizes on the highly diastereoselective Ireland-Claisen rearrangement of an acyclic alpha-branched allylic ester to set the quaternarystereogeniccenter at the core of the spiroimine ringsystem along with the adjacent tertiary stereocenter. The all-carbon macrocyclic ringsystem was formed by ring-closing metathesis.
描述了 (+)-pinnatoxin A 的收敛对映选择性全合成。该合成利用无环α-支链烯丙基酯的高度非对映选择性爱尔兰-克莱森重排,将四元立体中心与相邻的三级立体中心一起设置在螺亚胺环系统的核心。通过闭环复分解形成全碳大环系统。