with tosyl azide (TsN3) in the presence of potassium tert-butoxide (KOtBu) to afford diazophosphonates in yields up to 93% (generally 70–80%). Aryldiazophosponates were successfully explored for the synthesis of 5-aryl-substituted pyrazol-3-carboxylates in one pot by the 1,3-dipolar cycloaddition with alkyl acrylates followed by NaH treatment. The second stage led to elimination of the diethoxylphosphoryl
通过改进的重氮转移反应可以轻松制备各种 α-芳基-α-重氮
膦酸酯。在
叔丁醇钾 (KOtBu) 存在下,
膦酸苄酯与
叠氮甲苯磺酰基 (TsN 3 ) 反应生成重氮
膦酸酯,产率高达 93%(通常为 70–80%)。通过与
丙烯酸烷基酯的 1,3-偶极环加成,然后进行 NaH 处理,成功探索了芳基重氮
膦酸酯用于一锅合成 5-芳基取代的
吡唑-3-
羧酸酯。第二阶段导致二乙氧基
磷酰基部分随着循环的芳构化而消除。