Enantiospecific synthesis of dihydropyridines from chiral enamines
摘要:
A new asymmetric synthesis of dihydropyridines is described. This methodology is based on the use of chiral aminoalcohols to produce enamines, which were used in the synthesis of enantiopure 2-alkyl-2,3,8,8a-tetrahydro-7H-oxazolo[3,2-a]pyridines. The known stereochemistry of these compounds was exploited to obtain 1,4-dihydropyridines with controlled configuration at C-4. Copyright (C) 1996 Elsevier Science Ltd
The present short communication describes a Lewis acid (Zn[(L)proline]2) catalysed one pot synthesis of Hantzsch 1,4-dihydropyridine (DHP) derivatives under solvent-free condition by conventional heating and microwave irradiation. The Lewis acid catalyst Zn[(L)proline]2 used in this reaction afford moderate to good yield. The catalyst is reusable upto five cycles without appreciable loss of its catalytic
Oxidation of 4-aryl- and 4-alkyl-substituted 2,6-dimethyl-3,5-bis(alkoxycarbonyl)-1,4-dihydropyridines by human liver microsomes and immunochemical evidence for the involvement of a form of cytochrome P-450
作者:Ronald H. Boecker、F. Peter Guengerich
DOI:10.1021/jm00159a007
日期:1986.9
lost; these compounds also inactivated cytochromeP-450 and caused the loss of nifedipine oxidase activity after enzymaticoxidation. All of these reactions were extensively inhibited by an antibody raised to purified human liver nifedipine oxidase cytochromeP-450 (P-450NF), indicating a major role for this enzyme in the oxidation of these compounds. Oxidation of the 4-alkyl compounds led not only
An efficient, metal-free, room temperature aromatization of Hantzsch-1,4-dihydropyridines with urea–hydrogen peroxide adduct, catalyzed by molecular iodine
A mild, highly efficient and metal-free synthetic method for aromatization of 1,4-dihydropyridines employing urea–hydrogen peroxide adduct as oxidant catalyzed by 20 mol % of molecular iodine was developed. The reaction was carried out in ethyl acetate at roomtemperature and the products were isolated in high to excellent yields. A plausible free-radical mechanism is proposed based on results obtained
Synthesis, Evaluation of Pharmacological Activity, and Molecular Docking of 1,4-Dihydropyridines as Calcium Antagonists
作者:Moataz Ahmed Shaldam、Mervat Hamed El-Hamamsy、Dalia Osama Saleh、Tarek Fathy El-Moselhy
DOI:10.1248/cpb.c15-00737
日期:——
approximately three-fold more active than nifedipine as a calcium antagonist. A docking study with the DHP receptor model was performed to interpret the differences in calcium antagonist activities. The molecular docking study demonstrated that the lipophilicity of the substituted phenyl group at the 4-position of the DHP ring is an important factor that could increase the activity of the calcium antagonist
Magnetic Fe3O4 nanoparticles: Efficient and recoverable nanocatalyst for the synthesis of polyhydroquinolines and Hantzsch 1,4-dihydropyridines under solvent-free conditions
A green approach for efficient and rapid synthesis of biologically active substituted Hantzsch 1,4-dihydropyridine and polyhydroquinolinederivatives using magneticFe3O4 nanoparticles (Fe3O4 MNPs) as a recyclable catalyst undersolvent-freeconditions was reported. The catalyst was characterized by FT-IR, XRD, and TEM analysis. Compared to the classical reactions, this method consistently has the
报道了在无溶剂条件下使用磁性Fe 3 O 4纳米颗粒(Fe 3 O 4 MNPs)作为可循环利用催化剂高效,快速合成生物活性取代的Hantzsch 1,4-二氢吡啶和聚氢喹啉衍生物的绿色方法。通过FT-IR,XRD和TEM分析对催化剂进行了表征。与经典反应相比,该方法始终具有反应时间短,催化剂负载少,收率高,易于磁分离和催化剂可重复使用的优点。