Expansion of Phosphoramidite Chemistry in Solid-Phase Oligonucleotide Synthesis: Rapid 3′-Dephosphorylation and Strand Cleavage
作者:Kazuki Yamamoto、Yasufumi Fuchi、Yuta Ito、Yoshiyuki Hari
DOI:10.1021/acs.joc.2c02195
日期:2023.3.3
In solid-phase oligonucleotide synthesis, a solid support modified with a universal linker is frequently used to prepare oligonucleotides bearing non-natural- or non-nucleosides at the 3′-end. Generally, harsh basic conditions such as hot aqueous ammonia or methylamine are required to release oligonucleotides by 3′-dephosphorylation via the formation of cyclic phosphate with the universal linker. To
在固相寡核苷酸合成中,用通用接头修饰的固体支持物经常用于制备在 3' 端带有非天然或非核苷的寡核苷酸。通常,需要苛刻的碱性条件,如热氨水或甲胺,通过与通用接头形成环状磷酸盐,通过 3'-去磷酸化释放寡核苷酸。为了在较温和的条件下实现 3'-去磷酸化,我们使用O -烷基亚磷酰胺代替常用的O- 寡核苷酸 3'-末端的氰乙基亚磷酰胺。烷基化磷酸三酯比它们的氰乙基对应物更耐碱,因为后者在碱性条件下通过 E2 消除生成磷酸二酯。在设计的亚磷酰胺中,与传统的氰乙基和甲基类似物相比,烷基延伸的类似物在温和的碱性条件下(例如室温下氨水 2 小时)表现出快速有效的 3'-去磷酸化作用。此外,合成了带有 1,2-二醇的核苷亚磷酰胺并将其掺入寡核苷酸中。1,2,3,4-Tetrahydro-1,4-epoxynanaphthalene-2,3-diol-bearing 亚磷酰胺在 3'-末端表现得像一个通用接头