Ethynyl Side Chain Hydration during Synthesis and Workup of “Clickable” Oligonucleotides: Bypassing Acetyl Group Formation by Triisopropylsilyl Protection
作者:Sachin A. Ingale、Hui Mei、Peter Leonard、Frank Seela
DOI:10.1021/jo401780u
日期:2013.11.15
ethdU) or the 7-position of 7-deazaguanine (ethc7Gd) are hydrated during solid-phase oligonucleotide synthesis and workup conditions. The side products were identified as acetyl derivatives by MALDI-TOF mass spectra of oligonucleotides and by detection of modified nucleosides after enzymatic phosphodiester hydrolysis. Ethynyl → acetyl group conversion was also studied on ethynylated nucleosides under acidic
在嘧啶的5位(eth dC和eth dU)或7-脱氮鸟嘌呤(eth c 7 G d)的7位具有乙炔基残基的可点击寡核苷酸在固相寡核苷酸合成和后处理条件下水合)。通过寡核苷酸的MALDI-TOF质谱和通过酶促磷酸二酯水解后检测修饰的核苷,将副产物鉴定为乙酰基衍生物。还研究了在酸性和碱性条件下乙炔基核苷的乙炔基→乙酰基转化。可以证明侧链转化取决于核碱基的结构。引入三异丙基甲硅烷基残基以保护乙炔基残基免于水合。在所有情况下,经过去甲硅烷基化后,分离出无乙酰基的纯净寡核苷酸。