Synthesis of some aryl 2,3,4,6-tetra-O-acetyl-l-idopyranosides and of 4-methylcoumarin-7-yl α-l-idopyranosiduronic acid
作者:Neil Baggett、Amarjit K. Samra、Alan Smithson
DOI:10.1016/0008-6215(83)88356-6
日期:1983.12
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。