n-pentenyl glycosides in the efficient assembly of the blood group substance B tetrasaccharide
作者:Uko E. Udodong、C. Srinivas Rao、Bert Fraser-Reid
DOI:10.1016/s0040-4020(01)81568-4
日期:1992.6
monosaccharide components of the human blood-group determinant B are prepared with full or partial protection as required. Assembly of the tetrasaccharide then requires only five steps, three to give, in sequence, the disaccharide (68%), trisaccharide (82%), and tetrasaccharide (91%), the other two steps being required to deprotect hydroxyl groups at the di- and tri-saccharide levels for the ensuing
正戊烯基糖苷(nPG)对多种反应条件稳定,但仍可以被化学特异性活化的事实,对于寡糖的高效,收敛组装是有利的。nPG可直接从醛糖或通过正常的糖苷形成反应制备,并通过使用N-碘代琥珀酰亚胺/三乙基甲硅烷基三氟甲磺酸盐作为碘鎓源,甚至“解除武装”的糖基供体也会在数分钟内反应。人血型决定簇B的四种单糖组分可根据需要进行全部或部分保护。这样,四糖的组装仅需五个步骤,三个步骤依次得到二糖(68%),三糖(82%)和四糖(91%),