Selective and clean synthesis of aminoalkyl-<i>H</i>-phosphinic acids from hypophosphorous acid by phospha-Mannich reaction
作者:Peter Urbanovský、Jan Kotek、Ivana Císařová、Petr Hermann
DOI:10.1039/d0ra03075a
日期:——
Aminoalkyl-H-phosphinic acids, also called aminoalkylphosphonous acids, are investigated as biologically active analogues of carboxylic amino acids and/or as valuable intermediates for synthesis of other aminoalkylphosphorus acids. Their synthesis has been mostly accomplished by phospha-Mannich reaction of a P–H precursor, an aldehyde and an amine. The reaction is rarely clean and high-yielding. Here, reaction of H3PO2
氨基烷基-H-次膦酸,也称为氨基烷基亚膦酸,被研究作为羧酸氨基酸的生物活性类似物和/或作为合成其他氨基烷基磷酸的有价值的中间体。它们的合成主要是通过 P-H 前体、醛和胺的 phospha-Mannich 反应完成的。该反应很少是干净和高产的。在这里,H 3 PO 2与仲胺和甲醛在湿 AcOH 中的反应以几乎定量的产率产生氨甲基-H-次膦酸,并且几乎没有副产物。令人惊讶的是,反应结果取决于胺的碱性。p K a胺> 7-8 给出了所需的产品。对于弱碱性胺,还原性N-甲基化与H 3 PO 2氧化成H 3 PO 3相结合成为相关的副反应。伯胺的反应不太明显,只有非常碱性的胺才能获得氨基-双(甲基-H-次膦酸)。醛含量较高的反应产率较低。获得了源自多胺的独特的羧酸-次膦酸-膦酸以及聚(H-次膦酸)。氨基烷基-H的合成用途-次膦酸在 P-H 键氧化及其对双键的加成以及选择性胺脱保护中得到说明。具有乙