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Synthesis and biological evaluation of 1,4-dihydropyridine calcium channel modulators having a diazen-1-ium-1,2-diolate nitric oxide donor moiety for the potential treatment of congestive heart failure.

Abstract：

:A group of racemic 4-aryl(heteroaryl)-1,4-dihydro-2,6-dimethyl-3-nitropyridines possessing nitric oxide donor O(2)-acetoxymethyl-1-(N-ethyl-N-methylamino, or 4-ethylpiperazin-1-yl)diazen-1-ium-1,2-diolate, C-5 ester substituents were synthesized by coupling the respective 4-aryl(heteroaryl)-1,4-dihydro-2,6-dimethyl-3-nitropyridine-5-carboxylic acids with either O(2)-acetoxymethyl-1-[N-(2-methylsulfonyloxyethyl)-N-methylamino]diazen-1-ium-1,2-diolate, or O(2)-acetoxymethyl-1-[4-(2-methylsulfonyloxyethyl)piperazin-1-yl]diazen-1-ium-1,2-diolate. Compounds having a C-4 2-pyridyl, 4-pyridyl, 2-trifluoromethylphenyl, or benzofurazan-4-yl substituent exhibited more potent smooth muscle calcium channel antagonist activity (IC(50)'s in the 0.37-1.09 microM range) than related analogs having a C-4 3-pyridyl substituent (IC(50)'s=3.03-9.14 microM range) relative to the reference drug nifedipine (IC(50)=9.13 nM). The point of attachment of C-4 isomeric pyridyl substituents was a determinant of smooth muscle calcium channel antagonist activity where the relative potency profile was 4-pyridyl>2-pyridyl>3-pyridyl. Replacement of the C-5 methyl ester substituent of methyl 1,4-dihydro-2,6-dimethyl-3-nitro-4-(2-trifluoromethylphenyl)pyridine-5-carboxylate (Bay K 8644) by an O(2)-acetoxymethyl-1-(N-ethyl-N-methylamino)diazen-1-ium-1,2-diolate, or O(2)-acetoxymethyl-1-(4-ethylpiperazin-1-yl)diazen-1-ium-1,2-diolate, C-5 ester substituent provided compounds, which exhibited a lower, yet respectable, cardiac positive inotropic effect (IC(50)'s=4.82 and 4.05 microM, respectively) relative to the reference drug Bay K 8644 (IC(50)=0.30 microM). All compounds released nitric oxide upon incubation with either phosphate buffer at pH7, or porcine liver esterase. However, the percentage nitric oxide released was up to 3-fold higher (76%) when these O(2)-acetoxymethyl-1-(alkylamino)diazen-1-ium-1,2-diolates were incubated with guinea pig serum. These results suggest that *NO would be released in vivo, upon cleavage by nonspecific serum esterases, preferentially in the vascular endothelium where it may enhance smooth muscle calcium channel antagonist activity.

journal_name

Bioorg Med Chem

journal_title

Bioorganic & medicinal chemistry

authors

Velázquez C,Knaus EE

doi

10.1016/j.bmc.2004.05.008

subject

Has Abstract

pub_date

2004-07-15 00:00:00

pages

3831-40

issue

14

eissn

0968-0896

issn

1464-3391

pii

S0968089604003657

journal_volume

12

pub_type

杂志文章

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