The preparation of thymidine-thymidine and thymidine-5-methylcytidine dinucleosides containing a 3′-C-P-N-5′ ethyl phosphonamidate ester linkage, with defined phosphorus stereochemistry, in combination with a 2′-methoxy substituent in the lower sugar residue, is described. Incorporation of these dinucleosides into DNA oligonucleotides and the effect upon duplex stability with complimentary RNA is reported.
报告介绍了
胸苷-
胸苷和
胸苷-
5-甲基胞苷二核苷的制备方法,这些二核苷含有 3′-C-P-N-5′
乙基膦酰胺酯连接,具有明确的
磷立体
化学结构,并在较低的糖残基中结合了 2′-甲氧基取代基。报告还介绍了将这些二核苷掺入 DNA 寡核苷酸以及对与 RNA 互补的双链稳定性的影响。