First Asymmetric Synthesis of 6-Hydroxy-4-Sphingenine-Containing Ceramides. Use of Chiral Propargylic Alcohols To Prepare a Lipid Found in Human Skin
作者:Jiong Chun、Hoe-Sup Byun、Robert Bittman
DOI:10.1021/jo026240+
日期:2003.1.1
present here the first synthesis of the 6S and 6R diastereoisomers 2 and 3, which represent analogues of (2S,3R)-ceramide (1) having two allylic hydroxyl groups. Chiral propargylic alcohols 8 and 11, which were prepared by asymmetric dihydroxylation of alpha,beta-unsaturated ester 13 and allylic chloride 22, respectively, were employed as precursors of 2 and 3. Nucleophilic addition of lithiated TBS-protected
最近在人的皮肤中发现了含6-羟基-(4E)-鞘氨醇的神经酰胺。我们在这里介绍了6S和6R非对映异构体2和3的首次合成,它们代表具有两个烯丙基羟基的(2S,3R)-神经酰胺(1)的类似物。分别通过α,β-不饱和酯13和烯丙基氯化物22的不对称二羟基化制备的手性炔丙醇8和11分别用作2和3的前体。 1-丝氨酸衍生的醛26分别提供恶唑烷中间体27和33.酸介导的恶唑烷脱保护,然后N-酰化和桦木还原,完成2和3的合成。