作者:Henrik M. Pfundheller、Torsten Bryld、Carl E. Olsen、Jesper Wengel
DOI:10.1002/(sici)1522-2675(20000119)83:1<128::aid-hlca128>3.0.co;2-q
日期:2000.1.19
The synthesis of four novel 3′-C-branched and 4′-C-branched nucleosides and their transformation into the corresponding 3′-O-phosphoramidite building blocks for automated oligonucleotide synthesis is reported. The 4′-C-branched key intermediate 11 was synthesized by a convergent strategy and converted to its 2′-O-methyl and 2′-deoxy-2′-fluoro derivatives, leading to the preparation of novel oligonucleotide
报道了四种新型 3'-C-支链和 4'-C-支链核苷的合成及其转化为相应的 3'-O-亚磷酰胺结构单元以用于自动寡核苷酸合成。4'-C-支化关键中间体11通过收敛策略合成并转化为其2'-O-甲基和2'-脱氧-2'-氟衍生物,从而制备出含有4'-的新型寡核苷酸类似物C-(氨基甲基)-2'-O-甲基单体X和4'-C-(氨基甲基)-2'-脱氧-2'-氟单体Y(方案2和3)。一般来说,与未修饰的参考相比,这些类似物对互补单链 DNA 和 RNA 的结合亲和力增加(表 1)。2'-O-甲基-RNA寡核苷酸中单体X或单体Y的存在对2'-O-甲基-RNA寡核苷酸对DNA和RNA的结合亲和力具有负面影响。从 3'-C-烯丙基衍生物 28 开始,合成了 3'-C-(3-氨基丙基)-保护的核苷和 3'-O-亚磷酰胺衍生物,从而产生了含有 3'-C-(3-氨基丙基)胸苷单体Z或相应的3'-C-(3-氨基丙基)-2'-O