Efficient Synthesis of β-<scp>d</scp>-Mannosides and β-<scp>d</scp>-Talosides by Double Parallel or Double Serial Inversion
作者:Hai Dong、Zhichao Pei、Marcus Angelin、Styrbjörn Byström、Olof Ramström
DOI:10.1021/jo062643o
日期:2007.5.1
based on multiple regioselective acylation via the respective stannylene intermediates, followed by inversions to the corresponding manno- and talopyranoside structures by nitrite or acetate substitution. It was found that the ester group was able to induce the inversion of its two neighboring groups in high yields following either a double parallel or a double serial inversion process. By combination
邻近的赤道酯基团在Lattrell-Dax(亚硝酸盐介导的)碳水化合物差向异构反应中起着非常重要的作用,从而以高收率诱导了转化化合物的形成。基于这种效应,从相应的β- d-半乳糖苷和β- d合成β- d-甘露糖苷和β- d-塔洛糖苷的有效合成路线-葡糖苷,已经被设计。本路线基于经由各自的亚苯乙烯中间体的多次区域选择性酰化,然后通过亚硝酸盐或乙酸盐取代转化为相应的甘露糖苷和塔洛吡喃糖苷结构。发现酯基在双平行或双串联转化过程之后能够以高收率诱导其两个相邻基团的转化。通过直接反演,邻域和远程基团的参与,可以非常方便地以高收率获得数种β- d-甘露糖苷和β- d-塔洛糖苷衍生物。