The stereoselective synthesis of novel 4-octulose derivatives1Part III. For Part II, see ref.[1].1
作者:Isidoro Izquierdo Cubero、Maria T Plaza López-Espinosa、Miguel Rodrı́guezAlonso、Rafael Asenjo Asenjo、Antonio Ramı́rez Fernández
DOI:10.1016/s0008-6215(98)00076-7
日期:1998.3
methyl ( E )-2,3-dideoxy-4,5:6,8-di- O -isopropylidene- l - xylo -oct-2-ene-4-ulofuranosonate ( 1 ) with osmium tetraoxide took place with high diastereoselectivity to give a 7:1 mixture of methyl 4,5:6,8-di- O -isopropylidene- α - l - glycero - d - galacto - ( 2 ) and - d - ido -oct-4-ulofuranosonate ( 3 ). When 1 was dihydroxylated in the presence of dihydroquinine and dihydroquinidine p -chlorobenzoate
摘要用四氧化with将(E)-2,3-dideoxy-4,5:6,8-di-O-isopropylidene-1-l-xylo-oct-2-ene-4-ulofuranosonate(1)与二氧化Di进行二羟基化反应。高非对映选择性,得到7:1的4,5:6,8-di-O-异亚丙基甲基-α-l-甘油-d-半乳糖-(2)和-d- ido-oct-4-ulofuranosonate( 3)。当在二氢奎宁和二氢奎尼丁对氯苯甲酸酯的存在下进行二羟基化时,观察到分别以2/3的比率明显增加和减少。将化合物2转化为其2,3-二-O-甲基衍生物4,将其脱异丙基亚甲基化为2,3-二-O-甲基-α-1-甘油-甘油-d-半乳糖基-oct-4-ulyryranosonate甲酯(5)然后降解为2,3-二-O-甲基-(+)-1-酒石酸二甲酯(6)。另一方面,化合物2和3分别是 将异亚丙基化为相应的2,3:4,5:6,