An operationally simple synthetic method for (±)-α-aryl/methylsulfonamidomethylphosphonates and new (±)-γ-aryl/methyl sulfonamidomethylvinylphosphonates has been developed through straightforward reactions of (±)-α-hydroxyphosphonates with sulfonamides in the presence of triflic acid (TfOH) at room temperature in a vessel open to air. For γ-dimethylallylhydroxyphosphonate, the (E)-1,3-butadienylphosphonate was formed quantitatively using TfOH while FeCl3 afforded the expected product in moderate yield unpredictably. The favourable sulfonoamidation of benzyl alcohol is also observed when TfOH was used for α-hydroxyphosphonates having a benzyloxy group.
通过在室温下,在
三氟甲磺酸(TfOH)存在下,将(±)-α-羟基
膦酸与磺酰胺在开放容器中进行简单反应,开发了一种用于合成(±)-α-芳基/甲基磺酰胺
甲基膦酸酯和新型(±)-γ-芳基/甲基磺酰胺甲基
乙烯基膦酸酯的操作简便的合成方法。对于γ-二甲基烯丙基羟基
膦酸,TfOH定量地形成(E)-
1,3-丁二烯基
膦酸,而FeCl3则以中等产率不可预测地得到了预期产物。当TfOH用于含有苄氧基的α-羟基
膦酸时,也观察到
苄醇的有利磺酰胺化。