Laccase-catalyzed oxidation of Hantzsch 1,4-dihydropyridines to pyridines and a new one pot synthesis of pyridines
作者:Heba T. Abdel-Mohsen、Jürgen Conrad、Uwe Beifuss
DOI:10.1039/c2gc35950b
日期:——
laccase-catalyzed oxidation of 1,4-dihydropyridines to pyridines using aerial O2 as the oxidant exclusively delivers pyridines with yields up to 95% under mild reaction conditions. Combination of the Hantzsch 1,4-dihydropyridine synthesis with the newly developed laccase-catalyzed oxidation forms the basis of a facile and environmentally benign method for the synthesis of pyridines in one pot.
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
A novel, base-induced fragmentation of hantzsch-type 4-aryl-1,4-dihydropyridines
作者:Thomas McInally、Alan C. Tinker
DOI:10.1039/p19880001837
日期:——
Hantzsch-type 1,4-dihydropyridine derivatives substituted with highly electron-deficient aryl groups in the 4-position, on treatment with a variety of basic reagents in non-hydroxylic solvents, undergo an unexpected and ready scission of the inter-ring bond to give the corresponding 4-unsubstituted pyridine and an arene derived from the original 4-substituent. The scope of the reaction has been investigated