Synthesis of new N-heteroaryl derivatives of 4-pyrones from kojic acid based Baylis–Hillman acetates
作者:Z. Ghasemi、M. Eshtad、F. Poorhossain Mejarshin
DOI:10.1007/s10593-013-1188-2
日期:2013.2
A series of kojic acid benzyl ether derivatives possesing imidazole, benzimidazole, and pyrazole rings were synthesized by SN2'-substitution of these heterocycles using prepared Baylis–Hillman acetates.
Synthesis of fused pyrimidone derivatives of 4-pyrones from the acetates of Baylis–Hillman adducts
作者:A. Shahrisa、Z. Ghasemi
DOI:10.1007/s10593-010-0466-5
日期:2010.5
A series of fused pyrimidone derivatives of 4-pyrones was synthesized by conversion of the acetates of Baylis−Hillman adducts obtained from 2-formyl-4-pyrones with 2-aminopyridine and 2-aminothiazole.
Synthesis, spectroscopic and DFT studies of novel fluorescent dyes: 3-Aminoimidazo[1,2-a]pyridines possessing 4-pyrone moieties
作者:Aziz Shahrisa、Kazem Dindar Safa、Somayeh Esmati
DOI:10.1016/j.saa.2013.09.056
日期:2014.1
A series of novel imidazo[1,2-a]pyridines possessing 4-pyrone ring were synthesized by three-component condensation of 4-pyrone carbaldehydes, 2-aminopyridines and isocyanides. Bismuth (III) chloride was used as a catalyst in these reactions and desired products were synthesized in good yields at a very short period of time under solvent free conditions. UV-Vis absorption and fluorescence emission spectra of these compounds were investigated. It shown that two of these compounds (10f and 10g) exhibit intense fluorescence in dichloromethane. Optimized ground-state molecular geometries and orbital distributions of these two fluorescent dyes were obtained using density functional theory (DFT). Thermogravimetric analysis and electrochemical properties of these compounds were also studied. (C) 2013 Published by Elsevier B.V.
2-Oxoindolin-3-ylidene derivatives as 2π components in 1,3-dipolar cycloadditions of azomethine ylides
The 1,3-dipolar cycloadditions of various azomethine ylides to 2-oxoindolin-3-ylidene derivatives have been investigated. The structure and stereochemistry of cycloadducts were studied in detail by NMR spectroscopic methods. (C) 2001 Elsevier Science Ltd. All rights reserved.