Synthesis and Hybridisation Properties of Phosphonamidate Ester Modified Nucleic Acid
作者:Robin A. Fairhurst、Stephen P. Collingwood、David Lambert、Roger J. Taylor
DOI:10.1055/s-2001-12328
日期:——
The replacement of the two backbone oxygen atoms of the phosphodiester linkage of DNA with carbon and nitrogen in the form of a phosphonamidate ester linkage, in both possible regioisomeric forms, is described. An alkylation reaction with the 3′-C-P-N-5′ methyl phosphoamidate regioisomer yielded the corresponding N-methylated analogues. For each example separation into individual phosphonamidate ester diastereoisomers was performed prior to incorporation into oligonucleotides. The effect upon duplex stability for DNA oligonucleotides containing each of these modifications with complimentary RNA is reported.
本文介绍了用碳和氮以膦酰胺酯连接的形式取代 DNA 磷酸二酯连接的两个骨架氧原子的两种可能的异构体形式。与 3′-C-P-N-5′甲基膦酰酰胺异构体的烷基化反应产生了相应的 N-甲基化类似物。在将每个实例掺入寡核苷酸之前,先将其分离成单个膦酰酰胺酯非对映异构体。报告了含有这些修饰的 DNA 寡核苷酸与互补 RNA 对双链稳定性的影响。