Oxalohydrazide Ligands for Copper‐Catalyzed C−O Coupling Reactions with High Turnover Numbers
作者:Ritwika Ray、John F. Hartwig
DOI:10.1002/anie.202015654
日期:2021.4.6
long‐lived copper catalysts for couplings that form the C−O bonds in biaryl ethers. These Cu‐catalyzed coupling of phenols with aryl bromides occurred with turnovers up to 8000, a value which is nearly two orders of magnitude higher than those of prior couplings to form biaryl ethers and nearly an order of magnitude higher than those of any prior copper‐catalyzed coupling of aryl bromides and chlorides
在这里,我们报道了一类基于草酰肼核心和N-氨基吡咯和N-氨基吲哚单元的配体,它们生成长寿命的铜催化剂,用于在联芳醚中形成CO键的偶联。这些铜催化的酚类与芳基溴化物的偶联反应的转化率高达 8000,该值比之前形成联芳基醚的偶联反应高出近两个数量级,并且比任何现有的铜催化偶联反应高出近一个数量级。芳基溴和氯化物的催化偶联。该配体还产生了催化芳基氯与苯酚的偶联以及芳基溴和芳基碘与伯苄醇和脂肪醇的偶联的铜体系。可耐受多种官能团,包括腈、卤化物、醚、酮、胺、酯、酰胺、乙烯基芳烃、醇和硼酸酯,并且与药物相关结构中的芳基溴发生反应。