Ammonium iodide-promoted cyclization of ketones with DMSO and ammonium acetate for synthesis of substituted pyridines
作者:Xiaojun Pan、Qiao Liu、Liming Chang、Gaoqing Yuan
DOI:10.1039/c5ra07584j
日期:——
A simple and efficient method has been developed for the synthesis of symmetrical and unsymmetrical pyridines via NH4I-promoted cyclization of ketones with DMSO and NH4OAc. It was found that methyl ketones always gave selective formation of the unsymmetrical pyridine, while non-methyl ketones gave unpredictable results (symmetrical or non-symmetrical product only, or a mixture of the two). In addition
Pd-Catalyzed Decarboxylation and Dual C(sp<sup>3</sup>)–H Functionalization Protocols for the Synthesis of 2,4-Diarylpyridines
作者:Raghuram Gujjarappa、Nagaraju Vodnala、Mohan Kumar、Chandi C. Malakar
DOI:10.1021/acs.joc.8b02971
日期:2019.5.3
The Pd-catalyzed decarboxylation and dualC(sp3)–Hbondfunctionalization approaches have been described for the preparation of symmetrical and unsymmetrical 2,4-diarylpyridines. The developed transformations were realized using nonactivated aromatic ketones and amino acids as C–N sources. The efficacy of the catalyst and reagent combination drives the transformation toward the formation of desired
A simple and selective one-pot synthesis of 2,4- and 2,6-diarylpyridines through the cyclocondensation reaction of aromatic ketones with ammonium acetate has been developed. The procedure is metal-free, convenient, and efficient, and the substrates are readily available.
Decarboxylative cyclization of amino acids towards the Regioselective synthesis of 2,4-diarylpyridines via relay Fe(III)/In(III)-catalysis
作者:Raghuram Gujjarappa、Nagaraju Vodnala、Chandi C. Malakar
DOI:10.1016/j.tetlet.2019.151495
日期:2020.2
A competent relay Fe(III)-/In(III)-catalyzed decarboxylative cyclization of amino acids has been devised towards the exclusive preparation of 2,4-diarylpyridines. The efficacy of the developed conditions drives the reaction towards selective formation of 2,4-diarylpyridines over other pyridine derivatives. The described protocol showed good functional group tolerance with moderate to good yields of