Hydroxy propiolate rearrangement to conjugated diene, Sharpless asymmetric dihydroxylation and one-pot quinolizine construction have been used as key steps in the totalsynthesis of (−)-epiquinamide.
A Versatile Approach for the Asymmetric Syntheses of (1<i>R</i>,9a<i>R</i>)-Epiquinamide and (1<i>R</i>,9a<i>R</i>)-Homopumiliotoxin 223G
作者:Pei-Qiang Huang、Zheng-Qing Guo、Yuan-Ping Ruan
DOI:10.1021/ol0602203
日期:2006.3.1
[reaction: see text] Using 5b as a common intermediate, the first asymmetric synthesis of (-)-epiquinamide (4) and a formal asymmetric synthesis of (-)-homopumiliotoxin 223G (2) is described. A key feature of our approach is the flexible introduction of a functionalized C(4) side chain to (S)-3-benzyloxyglutarimide 7 in a regio- and diastereoselective manner. Utilization of a tandem Swern oxidation-Grignard