Stereocontrolled Synthesis of <scp>d</scp>- and <scp>l</scp>-β-Rhamnopyranosides with 4-<i>O</i>-6-<i>S</i>-α-Cyanobenzylidene-Protected 6-Thiorhamnopyranosyl Thioglycosides
作者:David Crich、Linfeng Li
DOI:10.1021/jo8022439
日期:2009.1.16
The synthesis of both enantiomers of a 4-O-6-S-α-cyanobenzylidene-protected 6-thiorhamnopyranosyl thioglycoside is described starting from d-mannnose and l-arabinose derivatives for the d- and l-series, respectively. This donor is effective in the preparation of the corresponding β-glycosides using the 1-benzenesulfinyl piperidine/trifluoromethanesulfonic anhydride protocol. Following desulfurization
的两种对映体的合成4- ö -6-小号-α-cyanobenzylidene保护-6- thiorhamnopyranosyl硫代糖苷描述从起始d -mannnose和升-arabinose衍生物为d -和升-series分别。该供体可有效地使用 1-苯亚磺酰基哌啶/三氟甲磺酸酐方案制备相应的 β-糖苷。在脱硫并伴随 Raney 镍脱苄基化后,如此形成的 6-硫代-β-甘露糖苷以高产率转化为 β-吡喃鼠李糖苷。