2,3-Unsaturated Allyl Glycosides as Glycosyl Donors for Selective α-Glycosylation
作者:Brijesh Kumar、Mushtaq A. Aga、Abdul Rouf、Bhahwal A. Shah、Subhash C. Taneja
DOI:10.1021/jo102333x
日期:2011.5.6
presence of NBS and a catalytic amount of a Lewis acid, 2,3-unsaturated allyl glycosides [6-(allyloxy)-3,6-dihydro-2-(hydroxymethyl)-2H-pyran-3-ol] have been successfully used as versatile glycosyl donors for the stereoselective α-glycosylation of a variety of alcohols comprising sensitive functions such as acetonide, keto, nitro, and ester in 50−90% yields. The methodology offers an equally facile alternative
在NBS和催化量的路易斯酸存在下,2,3-不饱和烯丙基糖苷[6-(烯丙氧基)-3,6-二氢-2-(羟甲基)-2 H-吡喃-3-醇]具有已成功地用作多种糖基供体,用于多种醇的立体选择性α-糖基化反应,这些醇具有50-90%的收率,包括敏感功能,如丙酮化物,酮,硝基和酯。该方法为不饱和糖中的4-戊烯基取代提供了同样简便的替代方法。