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Relevant academic research and scientific papers

L-Tyrosine loaded nanoparticles: An efficient catalyst for the synthesis of dicoumarols and Hantzsch 1,4-dihydropyridines

Environmentally benign l-tyrosine loaded nanoparticles are fabricated and characterized by PCS, TEM, FT-IR and AFM studies. A novel straightforward green approach was applied for the synthesis of dicoumarols and Hantzsch 1,4-dihydropyridines using this catalyst. The structures and purity of these compounds were confirmed by FT-IR and NMR (1H, 13C and DEPT). The flexible and swelling properties of the polymer coating increase l-tyrosine dispersion and its high catalytic activity in organic reactions. This journal is

Benzyltrimethylammoniumfluoride Hydrate: An Efficient Catalyst for One-Pot Synthesis of Hantzsch 1,4-Dihydropyridines and Their Aromatization

An efficient, cost-effective and simple protocol has been developed for the synthesis of Hantzsch 1,4-dihydropyridines and their oxidation into pyridines using benzyltrimethylammonium fluoride hydrate as an excellent catalyst under solvent-free condition. All of the products synthesized by this method are characterized by various spectroscopic methods (IR, 1H NMR, 13C NMR, and DEPT).

Synthesis of diethyl 4-substituted-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylates as a new series of inhibitors against yeast α-glucosidase

1,4-Dihydropyridine-3,5-dicarboxylate derivatives (1-25) were synthesized in high yields via Hantzsch reaction and evaluated for their α-glucosidase inhibitory activity. Compounds 1, 2, 6-8, 11, 13-15, and 23-25 showed a potent inhibitory activity against yeast α-glucosidase with IC50 values in the range of 35.0-273.7 μM, when compared with the standard drug acarbose (IC50 = 937 ± 1.60 μM). Their structures were characterized by different spectroscopic techniques. The kinetics, selectivity, and toxicity studies on these compounds were also carried out. The kinetic studies on most active compounds 14 and 25 determined their modes of inhibition and dissociation constants Ki. Compound 14 was found to be a non-competitive inhibitor with Ki = 25.0 ± 0.06, while compound 25 was identified as a competitive inhibitor with Ki = 66.0 ± 0.07 μM.

One-pot and solvent-free synthesis of 1,4-dihydropyridines and 3,4-dihydropyrimidine-2-ones using new synthetic recyclable catalyst via Biginelli and Hantzsch reactions

Pyridine dicarboxylic acid guanidine-cobalt complex (PDAG-Co) (3) catalyzes one-pot, three-component coupling of aldehydes, b-dicarbonyl compounds, and ammonium acetate to afford the corresponding 1,4-dihydropyridines (1,4-DHPs) via Hantzsch reaction. 3,4