Facile synthesis, vasorelaxant properties and molecular modeling studies of 2-amino-8a-methoxy-4H-pyrano[3,2-c]pyridine-3-carbonitriles

Add time:07/13/2019    Source:sciencedirect.com

A facile synthetic approach towards 6-alkyl-2-amino-4-aryl-4a,5,6,7,8,8a-hexahydro-8a-methoxy-4H-pyrano[3,2-c]pyridine-3-carbonitriles 3a–n was reported via reaction of 1-alkyl-4-piperidones 1a,b with ylidenemalononitriles 2a–h in methanol in the presence of sufficient amount of sodium. The structure of 3 was established through different spectroscopic techniques and confirmed by single crystal X-ray studies. Vasodilation activities of the synthesized compounds were investigated in vitro using isolated thoracic aortic rings of Wister rats pre-contracted with norepinephrine hydrochloride standard method. All the prepared analogues exhibited considerable vasodilation properties especially, 3g and 3c which revealed the best vasodilation potency (IC50 = 0.30, 0.37 mM, respectively) among all the tested compounds. Molecular modeling studies, including fitting of the synthesized compounds to a 3D-pharmacophore and their docking into optimized homology model as α1-AR antagonists showed high docking score and fit values. The experimental vasodilation activities of compounds 3a–n are consistent with their molecular modeling results.

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