Synthesis of some novel 1-(5-thio-β-D-xylopyranosyl)-lumazine and -pyrimidine nucleosides
作者:Najim A. Al-Masoudi、Wolfgang Pfleiderer
DOI:10.1016/s0040-4020(01)87232-x
日期:1993.8
4-Tetra-O-acetyl-5-thio-D-xylopyranose (1) reacts with the silylated lumazine bases (2–5) under trimethylsilyl trifluoromethylsulfonate catalysis to give the nucleosides 6, 8, 10, and 12 respectively, which face deblocking with potassium carbonate in dry methanol to yield the free nucleosides 17, 9, 11, and 13 respectively. The synthesis of 1-(2,3,4-tri-O-acetyl-5-thio-β-xylopyranosyl)-thymine (17) and
在三甲基甲硅烷基三氟甲基磺酸酯催化下,1,2,3,4-四-O-乙酰基-5-硫代-D-吡喃并吡喃糖(1)与甲硅烷基化的嗪基(2-5)反应,得到核苷6、8、10和分别用碳酸钾在干燥的甲醇中解封,分别得到游离核苷17、9、11和13。1-(2,3,4-三-O-乙酰基-5-硫代-β-吡喃吡喃糖基)-胸腺嘧啶(17)的合成及其游离核苷18已得到改进,并且以类似的方式使甲硅烷基化的嘧啶碱基15反应16和5碘(19)和5氟(21)类似物。脱酰作用分别得到游离核苷20和22。