The present invention provides a production method oligonucleotide, including (1) a step of condensing a nucleoside, nucleotide or oligonucleotide (a) or the like wherein a 5'-hydroxy group is not protected and a nucleoside, nucleotide or oligonucleotide (b) wherein a 5'-hydroxy group is protected in a non-polar solvent to give a reaction solution containing a phosphite triester product (c); (3) a step of oxidizing or sulfurizing the phosphite triester product (c) to give a reaction solution containing an oligonucleotide (d) wherein the 5'-hydroxy group is protected; (4) a step of deprotecting the oligonucleotide (d) to give a reaction solution containing an oligonucleotide (e) wherein the 5'-hydroxy group is not protected; and (6) a step of adding a polar solvent to the reaction solution containing the oligonucleotide (e) and purifying the oligonucleotide (e) by solid-liquid separation or extraction.
本发明提供了一种寡核苷酸的生产方法,包括:(1)在非极性溶剂中缩合5'-羟基未被保护的核苷、核苷酸或寡核苷酸(a)或类似物和5'-羟基被保护的核苷、核苷酸或寡核苷酸(b),得到含有
亚磷酸三酯产物(c)的反应溶液;(2)在非极性溶剂中缩合5'-羟基被保护的核苷、核苷酸或寡核苷酸(b),得到含有
亚磷酸三酯产物(c)的反应溶液;(3) 对
亚磷酸三酯产物(c)进行氧化或
硫化,得到含有寡核苷酸(d)的反应溶液,其中 5'- 羟基被保护; (4) 对寡核苷酸(d)进行脱保护,得到含有寡核苷酸(e)的反应溶液,其中 5'- 羟基未被保护;(6) 向含有寡核苷酸(e)的反应溶液中加入极性溶剂,并通过固液分离或萃取纯化寡核苷酸(e)。