Synthesis of 2‘-<i>O</i>-[2-[(<i>N,N</i>-Dimethylamino)oxy]ethyl] Modified Nucleosides and Oligonucleotides
作者:Thazha P. Prakash、Andrew M. Kawasaki、Allister S. Fraser、Guillermo Vasquez、Muthiah Manoharan
DOI:10.1021/jo0103975
日期:2002.1.1
route has been developed for the synthesis of 2'-O-[2-[(N,N-dimethylamino)oxy]ethyl] (abbreviated as 2'-O-DMAOE) modified purine and pyrimidine nucleosides and their corresponding nucleoside phosphoramidites and solid supports. To synthesize 2'-O-DMAOE purine nucleosides, the key intermediate B (Scheme 1) was obtained from the 2'-O-allyl purine nucleosides (13a and 15) via oxidative cleavage of the carbon-carbon
已开发出一种通用的合成路线,用于合成2'-O- [2-[(N,N-二甲基氨基)氧基]乙基](缩写为2'-O-DMAOE)修饰的嘌呤和嘧啶核苷及其相应的核苷亚磷酰胺和固体支持物。为了合成2'-O-DMAOE嘌呤核苷,通过将碳-碳键氧化裂解为相应的醛,从2'-O-烯丙基嘌呤核苷(13a和15)获得关键中间体B(方案1)通过减少。为了合成嘧啶核苷,用乙二醇的硼酸酯打开2,2'-脱水-5-甲基尿苷5,得到了关键的中间体B。将2'-O-(2-羟乙基)核苷进行了高产率的转化,通过区域选择性的Mitsunobu反应,形成相应的2'-O- [2-[(1,3-dihydro-1,3-二氧代-2H-异吲哚-2-基)氧基]乙基]核苷(18、19和20)。随后将这些化合物脱保护并转化为2'-O- [2-[([亚甲基氨基)氧基]乙基]衍生物(22、23和24)。还原并用甲醛进行第二次还原胺化,得到相应的2'-O-