Glycosylation of 1,2-O-isopropylidene-5-O-tert-butyldiphenylsilyl-α-D-ribofuranosev(8) with ethyl 3,4,6-tri-O-acetyl-2-O-benzyl-1-thio-α/β-D-glucopyranoside (7) under the agency of N-iodosuccinimide and trifluoromethanesulfonic acid (cat.) afforded α-linked dimer 10 in 95% yield. Vorbrüggen-type condensation of 12, obtained by deacetonation of 10 and subsequent acetylation, with bis-trimethylsilyl
1,2-糖基化ö异亚丙基-5- ø -叔-butyldiphenylsilyl-α-d-ribofuranosev(8用乙基)-3,4,6-三- ø -乙酰基-2- ø -苄基-1-
硫代在N-
碘琥珀
酰亚胺和
三氟甲磺酸(cat。)的作用下,α/β-
D-吡喃葡萄糖苷(7)以95%的收率得到α-连接的二聚体10。用双三甲基甲
硅烷基N 6-苯甲酰基
腺嘌呤通过将10脱乙酰化并随后进行乙酰化而获得的12的弗尔布根型缩合反应,得到
腺苷葡糖苷13。脱保护后,进行保护基操作后进行
磷酸化作用,可提供高总收率的均相2。