Formal synthesis of Cladospolide C & epi-Cladospolide C using R-(+)-γ-valerolactone as a chiral synthon
作者:Rajender Datrika、Srinivasa Reddy Kallam、Siddaiah Vidavalur、Nagaraju Rajana、T.V. Pratap
DOI:10.1016/j.tet.2019.04.001
日期:2019.5
The formal synthesis of Cladospolide-C and its analog is achieved by using enantiopure (R)-γ–valerolactone 10. The significant points of this synthesis are the stereoselective dihydroxylation of α, β-unsaturated ester 16 using Sharpless protocol, Wittig olefination of γ –valerolactol 6 with triphenylphosphonium iodide salt 7, one pot selective oxidation of 22 and subsequent C2-homologation with good
通过使用对映纯(R)-γ-戊内酯10可以完成Cladospolide-C及其类似物的正式合成。该合成的重点是使用Sharpless方案对α,β-不饱和酯16进行立体选择性二羟基化,对γ-戊内酯6的Wittig烯化反应与三苯基碘化salt盐7,一锅选择性氧化22和随后的C2均一化和良好的E / Z比。