A mild and highly selective N-benzoylation of cytosine and adenine bases in nucleosides with N-benzoyltetrazole
摘要:
N-Benzoyltetrazole has been developed as a mild and selective reagent for monobenzoylation of the exocyclic amino group in nucleic acid bases. its usefulness is demonstrated by protection of adenine and cytosine bases, an important procedure in the nucleic acid chemistry field. (C) 1997 Elsevier Science Ltd.
Disaccharidenucleosides constitute an important group of naturally‐occurring sugar derivatives. In this study, we report on the synthesis of disaccharidenucleosides by the direct O‐glycosylation of nucleoside acceptors, such as adenosine, guanosine, thymidine, and cytidine, with glycosyl donors. Among the glycosyl donors tested, thioglycosides were found to give the corresponding disaccharide nucleosides
二糖核苷是天然存在的糖衍生物的重要组成部分。在这项研究中,我们报道了通过核苷受体(如腺苷,鸟苷,胸苷和胞苷)与糖基供体的直接O-糖基化来合成二糖核苷。在测试的糖基供体中,发现硫代糖苷可以使用对甲苯磺酰氯(TolSCl)和三氟甲磺酸银(AgOTf)作为促进剂,以上述核苷受体以中等至高化学产率提供相应的二糖核苷。通过1 H NMR光谱实验检查了这些启动子与核苷受体的相互作用。