Synthesis of Substituted 1,4‐Dihydropyridines in Water Using Phase‐Transfer Catalyst Under Microwave Irradiation
作者:Hojatollah Salehi、Qing‐Xiang Guo
DOI:10.1081/scc-200039409
日期:2004.12.31
Abstract The synthesis of various substituted 1,4‐dihydropyridines has been achieved by the reaction of aldehydes, ethyl/methyl acetoacetates, and ammonium acetate in water using phase‐transfer catalyst undermicrowaveirradiation. Compared to the classical Hantzsch's reaction conditions, this new method consistently has the advantage of good yields and short reaction times. Bifunctionalcompounds containing
One-Pot Synthesis and Aromatization of 1,4-Dihydropyridines in Refluxing Water
作者:Guan-Wu Wang、Jing-Jing Xia
DOI:10.1055/s-2005-870022
日期:——
A series of 1,4-dihydropyridines were synthesized in an environmentally benign method, by reacting aldehydes with acetoacetate esters or acetylacetone and ammonium acetate in refluxing water. The thus formed 1,4-dihydropyridines was subsequently oxidized in one-pot to the corresponding pyridine derivatives by either ferric chloride or potassium permanganate.
An environmentally friendly and efficient synthesis of a series of 1,4-dihydropyridines was developed by the practical one-pot reactions of aldehydes with ammonium acetate and 1,3-dicarbonyl compounds such as alkyl acetoacetate, 5,5-dimethyl-1,3-cyclohexanedione, 1,3-cyclohexanedione, and 2,4-pentanedione in water without any additives under refluxing conditions.
An Efficient Transition-Metal-Chloride/Sodium-Nitrite/TEMPO Catalytic System for Aerobic Oxidative Aromatisation of Hantzsch 1,4-Dihydropyridines
作者:Bin-Hui Lou、Shu-Bin Chen、Jian Wang、Ying Chen、Jing-Hua Li
DOI:10.3184/174751913x13701832537930
日期:2013.7
A facile and efficient transition-metal-chloride/sodium-nitrite/TEMPO catalytic system for aerobic oxidative aromati-sation of Hantzsch 1,4-dihydropyridines in high yields under mild conditions is described.
Thiamine Hydrochloride–Catalyzed One-Pot Synthesis of 1,4-Dihydropyridine Derivatives Under Solvent-Free Conditions
作者:Min Lei、Lei Ma、Lihong Hu
DOI:10.1080/00397911.2010.494814
日期:2011.7.1
Abstract An efficient one-pot synthesis of 1,4-dihydropyridines from an aldehyde, β-keto ester, and ammonium acetate or formamidine acetate using thiamine hydrochloride (VB1) as the catalyst under solvent-free conditions at ambient temperature is described. All types of aldehydes, including aromatic, aliphatic, and unsaturated aldehydes, give good yields. The catalyst can easily be recovered after