报道了使用 Me 2 SO 4作为方便的烷基化剂在碱性条件下对简单的 1-氨基烷基膦酸进行季铵化的有效方案。在反应过程中,形成膦酸季铵衍生物及其相应的单酯。随后粗反应混合物的直接酸水解产生所需的新的N , N , N-三烷基-N-(1-膦酰基烷基)铵盐,总收率高达 88%。开发的方案在范围上是通用的,产品通过简单的结晶纯化,得到稳定的固体。带有膦基的新型季铵盐通常在酸性和碱性介质中不反应。然而,它们中的一些在碱的存在下会发生霍夫曼消除和取代反应。
Deamination of 1-Aminoalkylphosphonic Acids: Reaction Intermediates and Selectivity
作者:Anna Brol、Tomasz K. Olszewski
DOI:10.3390/molecules27248849
日期:——
acids in the reaction with HNO2 (generated "in situ" from NaNO2) yields a mixture of substitution products (1-hydroxyalkylphosphonic acids), elimination products (vinylphosphonic acid derivatives), rearrangement and substitution products (2-hydroxylkylphosphonic acids) as well as H3PO4. The variety of formed reaction products suggests that 1-phosphonoalkylium ions may be intermediates in such deamination