Pillaromycin-A: structural and synthetic studies related to the sugar moiety, pillarose
作者:Bert Fraser-Reid、David Louis Walker
DOI:10.1139/v80-429
日期:1980.12.1
of enone 6 with ethylene glycol gave an adduct from which the α-D-threo (16) and α-D-erythro (17) modifications of structure 2 have been elaborated. It was thereby shown that 2 is not the structure of pillarose. Addition of vinyl magnesium bromide to the ketone 24b gave a slight excess of one allylic alcohol, 25, which upon treatment with osmium tetroxide and hydrogen peroxide gave directly the α,α′-ketodiol
烯酮 6 与乙二醇的光诱导烷基化得到了一种加合物,从中详细说明了结构 2 的 α-D-苏式 (16) 和 α-D-赤式 (17) 修饰。从而表明2不是柱糖的结构。将乙烯基溴化镁加入到酮 24b 中得到略微过量的一种烯丙醇 25,在用四氧化锇和过氧化氢处理后直接得到 α,α'-酮二醇 3a。后者 33b 的差向异构体可通过酮 24b 的羧甲基化、酯的还原和羟基化获得。这些差向异构体的苯甲酰化分别得到 3b 和 33c,得出的结论是,前者甲基 2,3,6-trideoxy-4-C-[oxo(benzoyloxymethyl)methyl]-α-D-threo-hexopyranoside, 3b,是“甲基8-O-苯甲酰基柱苷”的对映异构体