Cu/
<scp>Picolinamides‐Catalyzed</scp>
Coupling of (Hetero)aryl Halides with Secondary Phosphine Oxides and Phosphite
<sup>†</sup>
作者:Chao Fang、Bangguo Wei、Dawei Ma
DOI:10.1002/cjoc.202100354
日期:2021.11
Some 4-hydroxy-picolinic acid derived amides were revealed as more efficient ligands for Cu-catalyzed coupling of (hetero)aryl halides with secondary phosphine oxides and phosphites. Only 3—5 mol% CuI and ligands were required to ensure coupling with a number of (hetero)aryl bromides and iodides to complete at 120 oC in 10—20 h.
一些 4-羟基-吡啶甲酸衍生的酰胺被揭示为更有效的配体,用于(杂)芳基卤化物与仲氧化膦和亚磷酸酯的铜催化偶联。仅需要 3-5 mol% CuI 和配体即可确保与许多(杂)芳基溴化物和碘化物的偶联在 120 o C 下在 10-20 小时内完成。
Syntheses of 3-Oxo-λ<sup>5</sup>-benzophospholes by an Intramolecular Cyclization of Phosphorus-ylide
Three synthetic procedures have developed for a new class of phosphorus-ylide containing conjugate heterocycles, 3-oxo-λ5-benzophospholes. The key to the heterocycle is unusual intramolecular acylation of phosphorus-ylide forming an endocyclic ylide. Several types of 2-substituted benzophospholes are synthesized, some of which showed a fluorescence.