A Practical Synthesis of the F-Ring of Halichondrin B via Ozonolytic Desymmetrization of a<i> C</i><sub>2</sub>-Symmetric Dihydroxycyclohexene
作者:Lei Jiang、Joseph R. Martinelli、Steven D. Burke
DOI:10.1021/jo026302w
日期:2003.2.1
one-pot Criegee ozonolysis/acylation protocol to afford acetal-lactone 2. Installation of the allyl side chain on the convex face of the bicyclic system and subsequent reduction provided the desired tetrahydrofuran 4 with the correct relative and absolute stereochemistries. Simple functional group manipulations led to the desired F-ring module 3 of halichondrin B.
C(2)对称的二羟基环己烯1通过一锅的Criegee臭氧分解/酰化方案脱对称,得到缩醛内酯2。烯丙基侧链在双环系统凸面上的安装以及随后的还原反应提供了所需的四氢呋喃4正确的相对和绝对立体化学。简单的功能组操作导致了葫芦素B的所需F环模块3。