The invention provides a method of synthesizing oligonucleotide N3'.fwdarw.P5' phosphoramidates using an amine-exchange reaction of phosphoramidites in which a -deprotected 3'-amino group of a solid phase supported oligonucleotide chain is exhanged for the amino portion of a 5'-phosphoramidite of an incoming monomer which has a protected 3'-amino group. The resulting internucleotide phosphoramidite linkage is then oxidized to form a stable protected phosphoramidate linkage. The method of the invention greatly improves product yields and reduces reagent usage over currently available methods for synthesizing the above class of compound.
本发明提供了一种合成寡核苷酸N3'.fwdarw.P5'
磷酰胺酰胺的方法,使用
磷酰胺酰胺的胺交换反应,在该反应中,固相支持的寡核苷酸链的去保护的3'-
氨基基团被交换为一个具有保护的3'-
氨基基团的进入单体的5'-
磷酰胺酰胺的
氨基部分。然后,将得到的核苷酸间
磷酰胺酰胺键氧化形成稳定的保护
磷酰胺酰胺键。本发明的方法大大提高了产物收率,并减少了合成上述类化合物的当前可用方法所需的试剂用量。