Light-Promoted Low-Valent-Tungsten-Catalyzed Ambient Temperature Amination of Boronic Acids with Nitroaromatics
作者:Heng Song、Yang Shen、Hu Zhou、Danli Ding、Fu Yang、Yemei Wang、Chen Xu、Xingwei Cai
DOI:10.1021/acs.joc.2c00138
日期:2022.4.15
conditions, nitroaromatics smoothly undergo C–N coupling reactions with their boronic acid partners, delivering structurally diverse secondary amines in good yields (>50 examples, yields up to 96%). This methodology is both scalable and highly chemoselective and engages both aliphatic and aromatic boronic acid partners. The catalysis is initiated by the deoxygenation of nitroaromatics by a trans-[W(CO)4(PPh3)2]
在温和的条件下触发与硝基芳烃和硼酸形成 C-N 键是非常可取的,因为大多数先前的工作都是在恶劣的条件下进行的,有时化学或区域选择性较差。在此,公开了一种能够使硼酸与硝基芳族化合物在环境温度下胺化的低价钨催化反应。随手可得的 W(CO) 6作为无外部光敏剂条件下的预催化剂,硝基芳烃与它们的硼酸伙伴顺利进行 C-N 偶联反应,以良好的产率(>50 个实例,产率高达 96%)提供结构多样的仲胺。该方法具有可扩展性和高度化学选择性,并涉及脂肪族和芳香族硼酸伙伴。催化通过反式-[W(CO) 4 (PPh 3 ) 2 ] (反式-W , PPh 3 = 三苯基膦)配合物对硝基芳烃的脱氧引发,该配合物通过配体置换原位形成。