Synthesis and Characterization of<i>para</i>-Substituted<i>N</i>,<i>N′-</i>Dihydroxybenzamidines and Their Derivatives as Model Compounds for a Class of Prodrugs
作者:Laura Schwarz、Ulrich Girreser、Bernd Clement
DOI:10.1002/ejoc.201301622
日期:2014.3
A synthetic strategy for previously unknown para-substituted N,N′-dihydroxybenzamidines and their O-monosubstituted and O,O′-disubstituted methyl, benzyl, and tetrahydropyranyl derivatives is described. The procedure starts with the corresponding hydroxamic acid chlorides, which after dehydrohalogenation give nitrile oxides. These intermediates in turn react with O-substituted hydroxylamines to afford
描述了以前未知的对位取代 N,N'-二羟基苯甲脒及其 O-单取代和 O,O'-二取代甲基、苄基和四氢吡喃衍生物的合成策略。该程序从相应的异羟肟酸氯化物开始,在脱卤化氢后得到腈氧化物。这些中间体依次与 O-取代的羟胺反应,在后处理后得到所需的 N,N'-二羟基苯甲脒。这类新的潜在前药通过 15N NMR 光谱表征。化学位移与 Hammett σ 值显着相关,特别是对于 r2 > 0.99 的肟型氮。Hammett σ 参数与分子中的电子密度可靠地相关。