Asymmetric Synthesis of <scp>d</scp>-<i>ribo</i>-Phytosphingosine from 1-Tetradecyne and (4-Methoxyphenoxy)acetaldehyde
作者:Zheng Liu、Hoe-Sup Byun、Robert Bittman
DOI:10.1021/jo100707d
日期:2010.7.2
synthesis of d-ribo-phytosphingosine (1) was achieved by utilizing the ProPhenol (12)-catalyzed alkynylation of unsaturated aldehyde 8 to afford allylic propargylic alcohol (S)-6 followed by asymmetric epoxidation and opening of propargylic epoxy alcohol anti-5 with NaN3/NH4Cl. Deprotection and reduction of the resulting acyclic azide 3 then gave 1. Alkyne−azide 3 was subjected to an intramolecular click
通过利用 ProPhenol (12) 催化不饱和醛8的炔基化反应得到烯丙基炔丙醇 ( S ) -6,然后进行不对称环氧化和炔丙环氧醇反式开环,实现了d-核糖-植物鞘氨醇 ( 1 )的不对称合成。5与NaN 3 /NH 4 Cl。然后将所得无环叠氮化物3脱保护并还原得到1。炔-叠氮化物3进行分子内点击反应,生成双环三唑,并发现其具有意想不到的邻位耦合常数。应用先进的 Mosher 方法验证了1的三个连续立体中心的构型。1的炔基叠氮化物类似物也可通过该路线容易地制备,其可在α-半乳糖基神经酰胺衍生物的合成中用作糖基受体。