Nickel-Catalyzed Cross-Coupling of Styrenyl Epoxides with Boronic Acids
作者:Daniel K. Nielsen、Abigail G. Doyle
DOI:10.1002/anie.201101191
日期:2011.6.27
Let's get multicatalytic! A Ni0 catalyst complexed with a biaryldialkyl monophosphine ligand facilitates CC bond formation between styrenylepoxides and aryl boronicacids (see scheme). X‐ray analysis of a catalytically active nickel/ligand complex supports a redox pathway involving CO bond activation. A variety of α‐substituted alcohols were generated with good reaction efficiency by a multicatalytic
Ring-opening of epoxides furnishing either linear or branched products belongs to the group of classic transformations in organic synthesis. However, the regioselective cross-electrophile coupling of aryl epoxides with aryl halides still represents a key challenge. Herein, we report that the vitamin B12/Ni dual-catalytic system allows for the selective synthesis of linear products under blue-light
提供线性或支化产物的环氧化物的开环属于有机合成中的经典转化组。然而,芳基环氧化物与芳基卤化物的区域选择性交叉亲电偶联仍然是一个关键挑战。在此,我们报告了维生素 B 12 /Ni 双催化系统允许在蓝光照射下选择性合成线性产物,从而补充获得支化醇的方法。实验和理论研究证实了所提出的涉及烷基钴胺素作为该反应中间体的机制。