作者:Mallela Sarmastate、Sreenivasulu Megati、Robert Klein、Brian Otter
DOI:10.1080/15257779508012392
日期:1995.5.1
Abstract As part of our studies on the synthesis of conformationally restricted nucleosides of types 1 and 2, where X = CH2, O or S, we required access to differentially substituted D-psicofuranosyl nucleosides such as 3. As shown in the table, we have developed a convenient approach to such compounds that depends on the direct condensation of the 1,2:3,4-di-O-isopropylidene-β-D-psicofuranose derivative
摘要作为我们合成1和2型构象受限核苷(其中X = CH2,O或S)的研究的一部分,我们需要获得3等差异取代的D-psicofuranosyl核苷。如表所示,我们有1,2,3,4-二-O-异亚丙基-β-D-四氢呋喃糖衍生物4与合适的甲硅烷基化嘌呤或嘧啶碱直接缩合,开发了一种简便的方法来处理这类化合物2。 3的β端基异构体以1:1的比例形成,β端基异构体的收率一般可与使用psicofuranosyl-halide2、2-苯甲酸酯4或2-硝基衍生物5的早期缩合方法相媲美。但是,本方法的优点是更容易获得起始糖4。