作者:Ian Paterson、Matthew Tudge
DOI:10.1016/s0040-4020(03)00814-7
日期:2003.8
cytotoxic 18-membered macrolide from the calcareous sponge Leucascandra caveolata, starts out with a Jacobsen asymmetric hetero Diels–Alder reaction to configure the 2,6-cis-tetrahydropyran ring. All the remaining oxygenated stereocentres are introduced with high selectivity by relying on substrate-based control. An efficient endgame depends on two Mitsunobu reactions, the first to close the macrolactone
一种高度立体控制的总合成物,来自钙质海绵Leucascandra Caveolata的具有细胞毒性的18元大环内酯类Leucascandrolide A,始于Jacobsen不对称杂Diels-Alder反应,以配置2,6-顺式-四氢吡喃环。依靠基于底物的控制,所有剩余的含氧立体中心均以高选择性引入。一个有效的终局取决于两次Mitsunobu反应,第一个反应是在C17处倒置来封闭大内酯,第二个反应是在C5处连接含恶唑的侧链,然后将两个炔烃进行Lindlar加氢以提供(+)-白咖啡酮A.