2â²-O-(1-Naphthyl)uridine and 2â²-O-(2-naphthyl)uridine were synthesized by a microwave-mediated reaction of 2,2â²-anhydrouridine with naphthols. Using the 3â²-phosphoramidite building blocks, these 2â²-O-aryluridine derivatives were incorporated into 2â²-O-methylated oligoribonucleotides. Incorporation of five 2â²-O-(2-naphthyl)uridines into a 2â²-O-methylated RNA sense strand significantly increased the thermostability of the duplex with a 2â²-O-methylated RNA antisense strand. Circular dichroism spectroscopy and molecular dynamic simulation of the duplexes formed between the modified RNAs and 2â²-O-methyl RNAs suggested that there are ÏâÏ interactions between two neighboring naphthyl groups in a sequence of the five consecutively modified nucleosides.
2′-O-(1-
萘基)
尿苷和2′-O-(2-
萘基)
尿苷是通过微波催化反应合成的,反应物为2,2′-无
水尿苷和
萘醇。使用3′-
磷酰胺基构筑单元,这些2′-O-芳基
尿苷衍
生物被纳入了2′-O-甲基化的寡
核糖核酸中。将五个2′-O-(2-
萘基)
尿苷引入到2′-O-甲基化的RNA正链中,显著提高了与2′-O-甲基化RNA反义链形成的双链的热稳定性。圆二色谱和分子动力学模拟显示,修饰RNA与2′-O-甲基RNA形成的双链中,五个连续修饰核苷酸的序列中,两个相邻的
萘基之间存在π–π相互作用。