Fmoc/Acyl protecting groups in the synthesis of polyamide (peptide) nucleic acid monomers
作者:Zoltán Timár、Lajos Kovács、Györgyi Kovács、Zoltán Schmél
DOI:10.1039/a907832k
日期:——
acid 7 is described using partial hydrolysis of a dianisoylated derivative. Different methods were studied for guanine alkylation including (a) Mitsunobu reaction; (b) low-temperature, sodium hydride- and (c) N,N-diisopropylethylamine-mediated alkylation reactions to give preferentially N 9-substituted derivatives. Empirical rules are proposed for differentiating N 9/N 7-substituted guanines based on
聚酰胺(肽)核酸(PNA)单体22–25的化学合成已使用Fmoc [ N-(2-氨基乙基)甘氨酸骨架],异戊二烯基(腺嘌呤),4-叔丁基苯甲酰基(胞嘧啶)和异丁酰/二苯基氨基甲(鸟嘌呤)的保护基团的组合,从而允许在低聚物合成两个肽和寡核苷酸合成。描述了使用二异氰酸酯化衍生物的部分水解来制备(N 6-茴香酰腺苷-9-基)乙酸7的另一种方法。研究了鸟嘌呤烷基化的不同方法,包括:(a)Mitsunobu反应;(b)低温氢化钠-和(c)N,N-二异丙基乙胺介导的烷基化反应,优先得到N 9-取代的衍生物。提出了基于其13 C NMR化学位移差异来区分N 9 / N 7取代鸟嘌呤的经验规则。