作者:Janina Bachmann、Christian Mang、Lars Ole Haustedt、Klaus Harms、Ulrich Koert
DOI:10.1002/ejoc.201201104
日期:2012.10.19
The BCD-ring substructure of granaticin A was synthesised following a new approach for the construction of the naphthoquinone moiety. The 2-oxabicyclo[2.2.2]oct-5-ene substructure was accessible stereoselectively using a Sharpless asymmetric dihydroxylation and a diastereoselective ketone reduction in combination with Yoshii's route. The naphthoquinone B-ring was prepared by addition of an aryllithium
granaticin A 的 BCD 环亚结构是按照一种构建萘醌部分的新方法合成的。使用 Sharpless 不对称二羟基化和非对映选择性酮还原结合 Yoshii 路线,可以立体选择性地获得 2-氧杂双环 [2.2.2] oct-5-ene 亚结构。萘醌 B 环是通过将芳基锂中间体添加到酸酐中,然后通过 AlCl3 和 Mg(OTf)2 介导的 Friedel-Crafts 环化来制备的。Friedel-Crafts 环化的成功依赖于将酮-羧酸转化为内酯缩醛。