Studies on the decomposition pathways of diastereoisomeric mixtures of aryl nucleoside α-hydroxyphosphonates under hydrolytic conditions. Synthesis of α-hydroxyphosphonate monoesters
作者:Agnieszka Szymańska-Michalak、Jacek Stawiński、Adam Kraszewski
DOI:10.1039/b9nj00717b
日期:——
mixtures) bearing different aryl groups, both in the ester and the hydroxymethine fragment, were investigated under various hydrolytic conditions. We found that in aqueous basic media, the stability and decomposition pathways of these compounds were governed by the electronic features of the aryl group in the hydroxymethine moiety (hydroxyphosphonate ⇌ H-phosphonate diester + aldehyde equilibria) and
在各种水解条件下,研究了酯和羟基次甲基片段中带有不同芳基 的核苷α-羟基膦酸酯1(非对映异构混合物)的分解途径。我们发现,在碱性水溶液中,这些化合物的稳定性和分解途径受羟基次甲基部分中芳基的电子特征支配(羟基膦酸酯 ⇌ H-膦酸酯二酯+醛平衡)和攻击亲核试剂(α-亲核试剂,例如 次碘酸盐或过氧化物阴离子)。在hydroxyphosphonates的水解速率中观察到的差异显著1与它们的直径: -acylated衍生物指向由相邻的羟基功能施加的分子内酸催化的重要性。基于这些发现,为其他方面难以访问的有效合成协议羟基膦酸酯已经开发出类型7的单酯。