Oligonucleotide phosphorylating reagents wherein the silyl moiety has three bulky substituents, such as phenyl or t-butyl, and the silyl moiety is attached to the carbon of an ethanol group whose hydroxyl is an activated phosphate group. The preferred compound is 2-triphenylsilylethyl-2-cyanoethyl-N,N diisopropylaminophosphoramidite. The method of using this reagent to phosphorylate the 5'-OH of nucleosides and oligonucleotides is also disclosed. Nucleosides and nucleotides whose 5'-OH has been phosphorylated by the above reagent are also disclosed. The phosphorylated intermediate bearing the silyl group may be separated from failure product on the basis of bulky substituents on the silyl protecting group, which can be later removed by fluoride ion.
寡核苷酸
磷酸化试剂,其中
硅烷基具有三个笨重的取代基,例如苯基或叔丁基,并且
硅烷基连接到
乙醇基的碳上,其羟基是活化的
磷酸酯基团。首选化合物是2-三苯基
硅基乙基-2-
氰基乙基-N,N-
二异丙基氨基
磷酰胺酯。还公开了使用该试剂
磷酸化核苷和寡核苷酸的方法。还公开了其5'-OH已被上述试剂
磷酸化的核苷和核苷酸。带有
硅基团的
磷酸化中间体可以基于
硅烷保护基上的笨重取代基与失败产物分离,后者可以通过
氟化物离子去除。