One-Pot Synthesis of Hantzsch Pyridines<i>via</i>NH<sub>4</sub>I Promoted Condensation of 1,3-Dicarbonyl Compounds with DMSO and NH<sub>4</sub>OAc
作者:Liming Chang、Junyi Lai、Gaoqing Yuan
DOI:10.1002/cjoc.201600255
日期:2016.9
A one‐pot synthesis of Hantzsch pyridines was achieved through NH4I‐promoted condensation of 1,3‐dicarbonylcompounds with DMSO and NH4OAc, in which the C4 of the pyridine rings was derived from DMSO and the nitrogen atom resulted from NH4OAc and NH4I. The target product could be obtained in moderate to excellent yields.
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