Copper-Catalyzed Oxidative Coupling of β-Keto Esters with <i>N</i>-Methylamides for the Synthesis of Symmetrical 2,3,5,6-Tetrasubstituted Pyridines
作者:Yizhe Yan、Hongyi Li、Zheng Li、Bin Niu、Miaomiao Shi、Yanqi Liu
DOI:10.1021/acs.joc.7b01516
日期:2017.8.18
copper-catalyzed oxidative formal [2+2+1+1] cycloaddition for the synthesis of symmetrical tetrasubstituted pyridines was first demonstrated. The reaction is involved in a domino cross-dehydrogenative coupling (CDC) of β-keto esters and N-methylamides, the C–N bond cleavage, the Michael addition, and a condensation and oxidative aromatization process. Multiple C–C and C–N bonds were constructed in onepot via the