6-tri-O-acetyl-1,2-O-isopropylidene-β- l -idofuranose have been evaluated. Previously described routes, which involved selective sulphonylation, were not reproducible on a 100-g scale. To overcome this difficulty, a new variation was developed, involving complete tosylation of 1,2-O-isopropylidene-α- d -glucofuranurono-6,3-lactone followed by reduction and acetylation. The idofuranose derivative was converted
摘要评价了3,5,6-三-O-乙酰基-1,2-O-异亚丙基-β-1-基
呋喃糖的合成路线。先前描述的涉及选择性磺酰化的途径在100克规模上是不可重现的。为了克服该困难,开发了新的变体,包括将1,2-O-异亚丙基-α-d-
葡糖呋喃呋喃诺-6,3-内酯完全甲
苯磺酸化,然后还原和乙酰化。经由1,6-脱
水-β-1-
吡喃
葡萄糖将所述
呋喃糖衍
生物转化为所需的1,2,3,4,6-戊-O-乙酰基-α-1-
吡喃糖。1,2,3,4,6-戊基-O-乙酰基-α-1-
吡喃糖与4-
硝基苯酚,1-或
2-萘酚或4-甲基
香豆素-7-醇的融合,使用新鲜熔融的
氯化锌作为催化剂,得到糖苷的端基异构体混合物,其中α端基异构体占优势。