作者:Slawomir Jarosz、Mateusz Mach、Jadwiga Frelek
DOI:10.1080/07328300008544111
日期:2000.1
Three sucrose monoalcohols with free hydroxyl groups at C-1', C-6, and C-6' (1, 4, and 6) were prepared selectively and in good yield from 2,3,3',4,4'-penta-O-benzylsucrose. These compounds were oxidized to aldehydes and reacted with stabilized ylide, Ph3P=CHCO2Me to afford appropriate α,β-unsaturated esters 10, 11, and 12. Each olefin was cis-hydroxylated with OsO4/NMO to stereoisomeric diols 13/14
选择性地制备了三种在C-1',C-6和C-6'(1、4和6)具有游离羟基的蔗糖一元醇,从2,3,3',4,4'-五-O-苄基蔗糖。这些化合物被氧化成醛,并与稳定的叶立德(Ph 3 P = CHCO 2 Me)反应,得到适当的α,β-不饱和酯10、11和12。将每种烯烃用OsO 4 / NMO顺式羟基化为立体异构二醇13 / 14、15 / 16和17/18,其配置通过化学相关性和CD评估进行分配。osmylation反应的立体选择性极低(大约3:2),特别是与对6,7-不饱和甲基糖苷的简单衍生物进行的类似过程相比,其异构二醇的比例为10:1。11(在葡萄糖部分由C 2-单元同源的衍生物)的osmylation没有服从Kishi法则。蔗糖醛7与糖衍生的膦酸酯22的霍纳-埃蒙斯反应得到α,β-不饱和衍生物24,其在葡萄糖末端被C 7-单元同源。