A new divergent approach towards carbocyclic α-, iso- and 3′-epi-nucleosides starting from enantiomerically pure (1S,2R)-2-benzyloxymethylcyclopent-3-enol (5) is described. In the key step, isomeric cyclopentanols were condensed with a N3-protected pyrimidine nucleobase using a modified Mitsunobu protocol. Moreover, the conversion into the cycloSal-pronucleotides and the effect of the orientation of the nucleobase on anti-HIV activity are reported.
报道了一种从手性纯的(1S,2R)-2-苄氧甲基环戊-3-烯醇(5)出发合成碳环α-、异-和3′-表-核苷的新分岔方法。在关键步骤中,异构
环戊醇与N3保护的
嘧啶核碱通过改进的Mitsunobu反应进行缩合。此外,还报道了其转化为环
硫酸核苷前体的过程以及核碱取向对HIV抑制活性的影响。