Oligosaccharides from “standardized intermediates”. The 2-amino-2-deoxy- d -galactose analog of the blood-group O(H) determinant, type 2, and its precursors
作者:Mina A. Nashed、Laurens Anderson
DOI:10.1016/0008-6215(83)88172-5
日期:1983.3
and the chloride 10. A fully protected form (11) of the trisaccharide alpha-L-Fucp-(1 leads to 2)-beta-D-Galp-(1 leads to 4)-D-GalNAc was then synthesized by coupling 10 to 4, partially deblocking the disaccharide product, and L-fucosylating the resulting intermediate. Cleavage of the O-benzyl groups from 11, with concomitant saturation of the allyl group, gave the propyl beta-glycoside of the unsubstituted
由2-乙酰氨基-2-脱氧-D-葡萄糖的相应衍生物通过以下方法制备选择性苄基化的糖苷烯丙基2-乙酰氨基-4,6-二-O-苄基-2-脱氧-β-D-吡喃半乳糖苷(4)。对溴苯磺酸盐和苯甲酸盐。从烯丙基6-O-苄基-2-O-(2-丁烯基)-α-D-获得2-O-苯甲酰基-3,4,6-三-O-苄基-α-D-吡喃半乳糖基(10)吡喃半乳糖苷通过已知的中间体。为了完成该序列,将1-丙烯基3,4,6-三-O-苄基半乳糖苷依次转化为2-苯甲酸酯,游离糖和氯化物10。三糖α的完全保护形式(11) -L-Fucp-(1导致2)-β-D-Galp-(1导致4)-D-GalNAc然后通过将10偶联至4,部分解封二糖产物并将L-岩藻糖基化的中间体合成。从11裂解O-苄基