A method for producing an oligonucleotide having a phosphorothioated site, including a step of obtaining a phosphite form or a phosphorous acid diester form by coupling a nucleoside, nucleotide or oligonucleotide wherein a 5'-hydroxy group is not protected, and other group is optionally protected by a protecting group used for nucleic acid synthesis or bonded to a solid phase carrier, and a nucleoside, nucleotide or oligonucleotide wherein a 3'-hydroxy group or a 3'-amino group is modified by a method for forming a phosphite form or a phosphorous acid diester form, and other group is optionally protected by a protecting group used for nucleic acid synthesis in the presence of an antioxidant.
一种生产具有
硫代磷酸位点的寡核苷酸的方法,包括通过偶联核苷、核苷酸或寡核苷酸获得
亚磷酸形式或
磷酸二酯形式的步骤,其中核苷、核苷酸或寡核苷酸的5'-羟基未被保护,其他基团可选择被用于核酸合成的保护基团保护或键合到固相载体上、以及核苷、核苷酸或寡核苷酸,其中 3'-羟基或 3'-
氨基通过形成
亚磷酸酯形式或
磷酸二酯形式的方法进行修饰,而其他基团可选择被用于核酸合成的保护基团在
抗氧化剂存在下进行保护。