The synthesis of various N-methylated nucleosides (m6A, m3C, m4C, m3U) is described. These minor nucleosides can be obtained by simple methylation with diazomethane of [2-(4-nitrophenyl)ethoxy]carbonyl(npeoc)-protected nucleosides. These methylated compounds are easily further derivatized to fit into the scheme of the [2-(dansyl)ethoxy]carbonyl (dnseoc) approach for RNA synthesis (dansyl=[5-(dimet
描述了各种N-甲基化核苷(m 6 A,m 3 C,m 4 C,m 3 U)的合成。这些次要核苷可以通过用[2-(4-
硝基苯基)乙氧基]羰基(npeoc)保护的核苷的
重氮甲烷简单甲基化而获得。这些甲基化的化合物容易进一步衍生化,以适合用于RNA合成的[2-(丹基)乙氧基]羰基(dnseoc)方法的方案(丹酰基= [5-(二甲基
氨基)
萘-1-基]磺酰基)。合成了各种包含N 6-甲基
腺苷的寡
核糖核苷酸,突显了dnseoc方法的有用性,特别是用于合成天然tRNA衍生的寡
核糖核苷酸序列。