The Use of Chiral Dithianes for the Synthesis of Chiral α-Oxo-β-Alkyl and Chiral α-Oxo-β-Aryl Esters
作者:Elizabeth Tyrrell、George A. Skinner、John Janes、Greig Milsom
DOI:10.1055/s-2002-32574
日期:——
A number of chiral dithianes were synthesised using chiral auxiliary technology. These were then used as acylanionequivalents in the synthesis of chiral α-oxo-β-alkyl and chiral α-oxo-β-aryl esters.
Asymmetric total synthesis of an acetate analogue of the endophytic unstable secondary metabolite bipolamide A has been achieved for the first time adopting a convergent approach. The key feature of this synthesis includes Evans's asymmetric ethylation, Wittig olefination, Takai olefination, stereoselective Grignard addition and intermolecular Heck coupling. This eventually developed a synthetic route
首次采用收敛方法实现了内生不稳定次级代谢物 bipolamide A 的乙酸酯类似物的不对称全合成。该合成的关键特征包括 Evans 的不对称乙基化、Wittig 烯化、Takai 烯化、立体选择性格氏加成和分子间 Heck 偶联。这最终开发了一种很少发现的带有 acyloin 部分的支化胺的合成路线。我们的合成最终明确地建立了天然存在的不稳定双酚酰胺 A 的未指定 C-8 中心的立体化学。