[1-Hydroxy-1-(2-hydroxyphenyl)ethyl]phosphonates and -phosphinates: convenient synthesis through intramolecular Abramov reaction and protective activity against influenza A
作者:Edward E. Korshin、Oskar K. Pozdeev
DOI:10.1016/j.tet.2013.11.007
日期:2013.12
hydrophosphonylation/hydrolysis sequence. A mild hydrolysis of amidophosphites and -phosphonites, bearing 2-acetylphenoxy-fragment and a hydrolytically labile diethylamino-group at the same trivalent phosphorus atom, directly afforded the title compounds. The overall process probably consists of three steps: (i) selective hydrolysis of the P(III)–N bond to generate the hydrophosphoryl-type intermediates; (ii) formation
分子内化和串联反应方法相结合已被用于合成[1-羟基-1-(2-羟基苯基)乙基]膦酸和-次膦酸二乙铵,这是通过标准的分子间氢膦酰化/水解顺序无法得到的。在相同的三价磷原子上带有2-乙酰基苯氧基片段和水解不稳定的二乙氨基的酰胺基亚磷酸酯和-亚膦酸酯的温和水解直接得到标题化合物。整个过程可能包括三个步骤:(i)P(III)–N键的选择性水解以生成氢磷酰基型中间体;(ii)通过分子内Abramov反应形成应变的2-取代的3-羟基-2-氧代-2,3-二氢-1,2-苯并恶唑磷; (iii)水解1,2-苯并恶唑中的内环P(IV)-O键,得到无环产物。高剂量的无毒水溶性标题α,γ-二羟基膦酸酯和-次膦酸酯仅在体外具有适度的活性,对小鼠的实验性A型流感感染(H3N2)表现出有益的但持久的作用。