Gold-Catalyzed Conversion of Aryl- and Alkyl-Substituted 1-(<i>o</i>-Aminophenyl)-2-propyn-1-ones to the Corresponding 2-Substituted 4-Quinolones
作者:Otto Seppänen、Mikko Muuronen、Juho Helaja
DOI:10.1002/ejoc.201402224
日期:2014.7
Gold-catalyzed cyclization of alkyl- or aryl-substituted 1-(o-aminophenyl)-2-propyn-1-ones to the corresponding 2-substituted 4-quinolones was studied with various gold salts and complexes. Screening of the different catalysts showed highest performance with cationic AuI species. In particular PPh3AuNTf2 complex was the most efficient catalyst. Relative to classic quinolone synthesis that requires harsh
用各种金盐和配合物研究了烷基或芳基取代的 1-(o-aminophenyl)-2-propyn-1-ones 到相应的 2-取代的 4-quinolones 的金催化环化。对不同催化剂的筛选显示出对阳离子 AuI 物质的最高性能。特别是 PPh3AuNTf2 复合物是最有效的催化剂。相对于需要苛刻环缩合条件的经典喹诺酮合成,目前的方法提供了一种温和且原子经济的替代方法。从机制上讲,TPSS-D3/def2-TZVP 水平的 DFT 研究表明,金以亲炔方式而不是通过共轭羰基活化作用。