Studies on Glycosides XVI. The Use of Mannosyl Trichloroacetate in the Synthesis of α-Mannosides and Related Oligosaccharides
作者:Zhong-Jun Li、He-Qing Huang、Meng-Shen Cai
DOI:10.1080/07328309608005669
日期:1996.5
in the absence of a suitable promoter and function as a temporary protecting group; others are very reactive.3 The trifluoroacetoxyl group was found to be a good leaving group at the anomeric position and C, O, S and N-glycosides,4 and oligosaccharides5 were synthesized with high stereoselectivity in our laboratory using derivatives that contain this group. However the glycosyl trifluoroacetates were
摘要糖苷和寡糖的立体选择性合成已引起广泛关注,不仅用于天然产物的制备1,还用于糖的同源化以用作更复杂的合成靶标的手性模板。2目前最新的制备方法3的糖苷是基于异头中心离去基团的活化作用。3已提出了多种(潜在的)离去基团。它们中的一些在没有合适的启动子的情况下是稳定的,并起着临时保护基的作用。3三氟乙酰氧基在异头位置是一个很好的离去基团,在我们的实验室中,C,O,S和N-糖苷4和寡糖5均使用含有该基团的衍生物以高立体选择性合成。然而,发现三氟乙酸糖基酯反应性太强,并且研究了含有三氯乙酰氧基离去基团的新的糖基供体。我们现在报告立体声音响...