Method of using 1-arylheteroarylalkyl substituted-1H-1,2,4-triaz

Details Method of using 1-arylheteroarylalkyl substituted-1H-1,2,4-triaz Method of using 1-arylheteroarylalkyl substituted-1H-1,2,4-triaz

1993-08-19

1997-02-11

Ivy, C. Warren

Harness for working animal

5412724, H01N 4340

Patent

active

056021534

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

Non-peptidic 1-arylheteroarylalkyl substituted-1H-1,2,4-triazole compounds are described for use in treatment of circulatory disorders such as hypertension and congestive heart failure. Of particular interest are angiotensin II antagonist compounds provided by 1H-1,2,4-triazoles having a arylheteroarylmethyl moiety attached to the nitrogen atom at the one-position of the 1H-1,2,4-triazole.


BACKGROUND OF THE INVENTION

The renin-angiotensin system is one of the hormonal mechanisms involved in regulation of pressure/volume homeostasis and in expression of hypertension. Activation of the renin-angiotensin cascade begins with renin secretion from the juxtaglomerular apparatus of the kidney and culminates in the formation of angiotensin II, the primary active species of this system. This octapeptide, angiotensin II, is a potent vasoconstrictor agent and also produces other physiological effects such as promoting aldosterone secretion, promoting sodium and fluid retention, inhibiting renin secretion, increasing sympathetic nervous system activity, increasing vasopressin secretion, causing positive cardiac inotropic effect and modulating other hormonal systems.
Previous studies have shown that antagonizing angiotensin II at its receptors is a viable approach to inhibit the renin-angiotensin system, given the pivotal role of this octapeptide which mediates the actions of the renin-angiotensin system through interaction with various tissue receptors. There are several known angiotensin II antagonists, most of which are peptidic in nature. Such peptidic compounds are of limited use due to their lack of oral bioavailability or their short duration of action. Also, commercially-available peptidic angiotensin II antagonists (e.g., Saralasin) have a significant residual agonist activity which further limit their therapeutic application.
Non-peptidic compounds with angiotensin II antagonist properties are known. For example, the sodium salt of 2-n-butyl-4-chloro-1-(2-chlorobenzyl)imidazole-5-acetic acid has specific competitive angiotensin II antagonist activity as shown in a series of binding experiments, functional assays and in vitro tests [P. C. Wong et al, J. Pharmacol. Exp. Ther., 247(1), 1-7 (1988)]. Also, the sodium salt of 2-butyl-4-chloro-1-(2-nitrobenzyl)imidazole-5-acetic acid has specific competitive angiotensin II antagonist activity as shown in a series of binding experiments, functional assays and in vivo tests [A. T. Chiu et al, European J. Pharmacol., 157, 3121 (1988)]. A family of 1-benzylimidazole-5-acetate derivatives has been shown to have competitive angiotensin II antagonist properties [A. T. Chiu et al, J. Pharmacol. Exp. Ther., 250(3), 867-874 (1989)]. U.S. Pat. No. 4,816,463 to Blankey et al describes a family of 4,5,6,7-tetrahydro-1H-imidazo(4,5-c)-tetrahydro-pyridine derivatives useful as antihypertensives, some of which are reported to antagonize the binding of labelled angiotensin II to rat adrenal receptor preparation and thus cause a significant decrease in mean arterial blood pressure in conscious hypertensive rats. EP No. 253,310, published 20 Jan. 1988, describes a series of aralkyl imidazole compounds, including in particular a family of biphenylmethyl substituted imidazoles, as antagonists to the angiotensin II receptor. EP No. 323,841 published 12 Jul. 1989 describes four classes of angiotensin II antagonists, namely, biphenylmethylpyrroles, biphenylmethylpyrazoles, biphenylmethyl-1,2,3-triazoles and biphenylmethyl 4-substituted-4H-1,2,4-triazoles, including the compound 3,5-dibutyl-4-[(2'-carboxybiphenyl-4-yl)methyl]-4H-1,2,4-triazole. U.S. Pat. No. 4,880,804 to Carini et al describes a family of biphenylmethylbenzimidazole compounds as angiotensin II receptor blockers for use in treatment of hypertension and congestive heart failure.
There are several families of 1,2,4-triazole compounds having substituents attached to the nitrogen atom at the one-position of the 1H-triazole. For example, U.S. Pat. No. 4,118,487 to Regel et al describes a family azol-1-yl

REFERENCES:
patent: 4118487 (1978-10-01), Regel et al.
patent: 4381306 (1983-04-01), Regel et al.
patent: 4480114 (1984-10-01), Regel et al.
patent: 4816463 (1989-03-01), Blankley et al.
patent: 4880804 (1989-11-01), Carini et al.
P. C. Wong et al, J. Pharmacol. Exp. ther., 247(1), 1-7 (1988).
A. T. Chiu et al, European J. Pharmacol., 157, 13-21 (1988).
A. T. Chiu et al, J. Pharmacol. Exp. Ther., 250(3), 867-874 (1989).

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