Synthesis of Dialkyl 2-(2-Hydroxyphenyl)-4,6-dimethyl-1,2-dihydropyridine-3,5-dicarboxylates and Alkyl 2,4-Dimethyl-5-oxo-5H-[1]benzopyrano[4,3-b]-pyridine-3-carboxylates
Tricarbonylchromiumcomplexes of 4-aryl-1,4-dihydropyridines have been synthesized both under standard thermodynamic conditions using Cr(CO)6 and under milder complexation conditions using more labile [Cr(CO)3(NH3)3] and (η6-naphthalene)Cr(CO)3. Selective complexation of the Cr(CO)3 on the aryl ring in the presence of a 1,4-dihydropyridine ring was achieved.Graphical Abstract
Dihydropyridine-fused and pyridine-fused coumarins: Reduction on a glassy carbon electrode in dimethylformamide
作者:Luis J. Nuñez-Vergara、V. Pardo-Jiménez、C. Barrientos、C.A. Olea-Azar、P.A. Navarrete-Encina、J.A. Squella
DOI:10.1016/j.electacta.2012.08.088
日期:2012.12
pyridine-fused coumarins were synthesised and electrochemically characterised in aprotic medium. In both series, the most easily reducible groups were the endocyclic carbonyl groups. The electrochemical mechanism for both types of compounds is strongly dependent on the experimental time-scale. Cyclic voltammetric (CV) reduction on a glassy carbonelectrode (GCE) of the endocyclic carbonyl group of d
On the one pot syntheses of chromeno[4,3-b]pyridine-3-carboxylate and chromeno[3,4-c]pyridine-3-carboxylate and dihydropyridines
作者:Patricio A. Navarrete-Encina、Ricardo Salazar、Christian Vega-Retter、Karina Pérez、Juan A. Squella、Luis J. Nuñez-Vergara
DOI:10.1590/s0103-50532010000300003
日期:——
Substituted chromenos, dihydropyridines and pyridines have been important in the syntheses of compounds having interesting pharmacological properties. Therefore, we found of interest to synthesize chromenopyridines and chromenodihydropyridines (i.e., fused chromeno and dihydropyridine or pyridine rings) to further study their biological activity. Here, we propose one-pot syntheses for substituted ethyl-2,4-dimethyl-5-oxo-5H-chromeno[4,3-b]pyridine-3-carboxylates, ethyl-2,4-dimethyl-5-oxo-5H-chromeno[3,4-c]pyridine-3-carboxylates and their respective 1,4-dihydropyridines based on a modified Hantzsch pyridine synthesis using 2-hydroxyaryl aldehydes, with electron withdrawing and electron donating groups on the phenyl ring, as starting reactants. Sixteen compounds were synthesized by the described method and fully characterized. An average yield of 37% was obtained for the different derivatives.
Substituted and bridged pyridines useful as pharmaceutical agents