Formal Synthesis of (+)-3-Deoxy-<scp>d</scp>- <i>g</i><i>lycero</i>-<scp>d</scp>-<i>g</i><i>alacto</i>-2-nonulosonic Acid (KDN) via Desymmetrization by Ring-Closing Metathesis
作者:Steven D. Burke、Eric A. Voight
DOI:10.1021/ol006887l
日期:2001.1.1
[figure: see text] Formal synthesis of the naturally occurring deaminated sialic acid KDN, a potential oncofetal antigen, has been accomplished in 45% overall yield via a novel ketalization/ring-closing metathesis sequence. The rapid introduction of all oxygen functionality in a completely stereocontrolled manner exploited a rigid 6,8-dioxabicyclo[3.2.1]oct-2-ene ring system. This general synthetic strategy
[图:见正文]通过一种新的缩酮化/闭环复分解序列,天然合成的脱氨基唾液酸KDN(一种潜在的胎粪抗原)的正式合成已完成,总收率为45%。以完全立体控制的方式快速引入所有氧官能团,利用了刚性的6,8-二氧杂双环[3.2.1]辛-2-烯环系统。这种通用的合成策略应可提供许多KDN和唾液酸类似物的途径。