The present invention provides nuclease resistant 5'-dithio-modified oligonucleotides that are useful in nucleic acid therapeutics and diagnostics. The novel modified oligonucleotides have at least one 5'-dithioate linkage, wherein both the oxygen atom at the 5'-position (5'-bridging oxygen) and at least one of the non-bridging oxygen atoms of a naturally occurring phosphodiester linkage are independently replaced with a single sulfur atom. The invention also provides a polymer-supported method for making 5'-dithio-modified and 5'-thio-modified oligonucleotides as well as novel monomeric nucleoside and nucleotide intermediates useful in the synthetic method.
本发明提供了一种核酸治疗和诊断中有用的
核酸酶抗性5'-二
硫修饰寡核苷酸。这种新型修饰寡核苷酸至少具有一个5'-
二硫酸酯键,其中5'-位置(5'-桥接氧)的氧原子和至少一个天然存在的
磷酸二酯键的非桥接氧原子独立地被单个
硫原子取代。本发明还提供了一种聚合物支持的方法,用于制备5'-二
硫修饰和5'-
硫修饰的寡核苷酸,以及在合成方法中有用的新型单体核苷和核苷酸中间体。