Synthesis of Some New Unsymmetrically Substituted 1,4-Dihydropyridines
作者:Hamid R. Memarian、Masumeh Abdoli-Senejani、Dietrich Döpp
DOI:10.1515/znb-2006-0110
日期:2006.1.1
5-unsymmetrically substituted1,4-dihydropyridines have been synthesized, which have ethoxycarbonyl and acetyl groups on 3- and 5-positions, respectively. A three-step procedure has been examined to increase the yield of the desired products, by suppressing the formation of the symmetrically substituted 3,5-diacetyl-1,4-dihydropyridines and 3,5-diethoxycarbonyl- 1,4-dihydropyridines.
Photoinduced Aromatization of Unsymmetrically Substituted 1,4-Dihydropyridines
作者:Hamid R. Memarian、Masumeh Abdoli-Senejani、Dietrich Döpp
DOI:10.1002/jccs.200700022
日期:2007.2
Irradiationofunsymmetricallysubstituted1,4-dihydropyridines(1b-1j)whilebubblingoxygenorargon through the solution resulted in aromatization to the corresponding pyridine derivatives (3b-3j). Compound 1a with 2-nitrophenyl substituent in 4-position undergoes elimination of water upon irradiation under both oxygen and argon atmospheres and formation of 3a with 2-nitrosophenyl substituent. On the other