Nucleotides, Part LXVIII, Acetals as New 2′-O-Protecting Functions for the Synthesis of Oligoribonucleotides: Synthesis of Monomeric Building Units and Oligoribonucleotides
作者:Stefan Matysiak、Wolfgang Pfleiderer
DOI:10.1002/1522-2675(20010516)84:5<1066::aid-hlca1066>3.0.co;2-h
日期:2001.5.16
For the efficient synthesis of oligoribonucleotides by the 5′-O-(4,4′-dimethoxytrityl) phosphoramidite approach, the 2′-O-[1-(benzyloxy)ethyl]acetals 56 – 67 were investigated. Studies with the 2′-O-[1-(benzyloxy)ethyl]-5′-O-(dimethoxytrityl)ribonucleoside 3′-phosphoramidites 56 – 59 gave, however, only reasonable results. The oligoribonucleotides obtained showed some impurities since the acid stabilities
为了通过 5'-O-(4,4'-二甲氧基三苯甲基) 亚磷酰胺方法有效合成寡核糖核苷酸,研究了 2'-O-[1-(苄氧基)乙基]缩醛 56-67。然而,对 2'-O-[1-(苄氧基)乙基]-5'-O-(二甲氧基三苯甲基)核糖核苷 3'-亚磷酰胺 56 – 59 的研究仅给出了合理的结果。由于缩醛和二甲氧基三苯甲基官能团的酸稳定性太接近而无法保证高选择性,因此获得的寡核糖核苷酸显示出一些杂质。新的酸不稳定保护的 2'-O-保护基团与 2-(4-硝基苯基)乙基/[2-(4-硝基苯基)乙氧基]羰基 (npe/npeoc) 策略的碱基保护组合更为成功。描述了单体结构单元及其中间体 8-67 的合成和物理特性,以及自动生成同源和混合寡核苷酸的条件。新的 2'-缩醛保护基团可以在两步过程中被切割掉,并且设计用于平衡它们对于连接的核碱基的稳定性。因此,我们使用 1-3-fluoro-4-[2-