Quinoline derivatives

Details Quinoline derivatives Quinoline derivatives

2003-02-04

2004-02-24

Seaman, D. Margaret (Department: 1625)

Drug, bio-affecting and body treating compositions

Designated organic active ingredient containing

Having -c-, wherein x is chalcogen, bonded directly to...

C546S159000, C546S160000, C546S162000

Reexamination Certificate

active

06696467

ABSTRACT:

BACKGROUND OF THE INVENTION
Neuropetide Y is a 36 amino acid peptide that is widely distributed in the central and peripheral nervous systems. This peptide mediates a number of physiological effects through its various receptor subtypes. Studies in animals have shown that neuropeptide Y is a powerful stimulus of food intake, and it has been demonstrated that activation of neuropeptide Y Y5 receptors results in hyperphagia and decreased thermogenesis. Therefore compounds that antagonise neuropetide Y at the Y5 receptor subtype represent an approach to the treatment of eating disorders such as obesity and hyperphagia.
The current approach is aiming at medical intervention to induce weight loss or prevention of weight gain. This is achieved by interfering with appetite control, which is mediated by the Hypothalamus, an important brain region proven to control food intake. Herein, neuropeptide Y (NPY) has been proven to be one of the strongest central mediators of food intake in several animal species. Increased NPY levels result in profound food intake. Various receptors of neuropeptide Y (NPY) have been described to play a role in appetite control and weight gain. Interference with these receptors is likely to reduce appetite and consequently weight gain. Reduction and long-term maintenance of body weight can also have beneficial consequences on con associated risk factors such as arthritis, cardiovascular diseases, diabetes and renal failure.
SUMMARY OF THE INVENTION
The present invention is concerned with novel quinoline derivatives useful as neuropeptide Y (NPY) receptor ligands, particularly neuropeptide Y (NPY) antagonists. More particularly, the present invention discloses compounds of the general formula
and the pharmaceutically acceptable salts and esters thereof, and their use in the form of pharmaceutical preparations for the treatment or prevention of various disease states and related morbidities including obesity.
DETAILED DESCRIPTION OF THE INVENTION
The present invention comprises compounds of the formula
wherein
R
1
and R
2
are independently selected from hydrogen, alkyl, cycloalkyl, cycloalkylalkyl, alkylcarbonyl, cycloalkylcarbonyl, cycloalkylalkylcarbonyl, aryl, aralkyl, arylcarbonyl, aralkylcarbonyl, alkoxyalkyl, hydroxyalkyl, heterocyclyl, heterocyclylalkyl, heterocyclylcarbonyl, heterocyclylalkylcarbonyl, carbocyclyl, carbocyclylalkyl, amino, alkyl-SO
2
—, aryl-SO
2
—, heterocyclyl-SO
2
— or amino-SO
2
— or R
1
and R
2
together with the N atom to which they are attached form a 5- to 10-membered heterocyclic ring which optionally comprises a second heteroatom selected from nitrogen or oxygen and, wherein the heterocyclyc ring is optionally substituted with one or more substituents independently selected from alkyl and alkoxy;
R
3
is hydrogen, alkyl, amino or halogen;
R
4
is hydrogen, halogen, heterocyclyl, amino or alkyl;
A is a 5 to 7-membered saturated heterocyclic ring comprising the nitrogen atom which is attached to the quinoline ring and optionally a second heteroatom which is selected from oxygen, sulfur or nitrogen and, wherein the ring A is optionally substituted by one to three substituents independently selected from alkyl, alkoxy, hydroxy, amino, acetylamino, cyano, hydroxyalkyl, alkoxyalkyl, cycloalkylalkoxy and cycloalkylalkoxyalkyl; and pharmaceutically acceptable salts and esters thereof.
The compounds of formula I and their pharmaceutically acceptable salts and esters are novel and have valuable pharmacological properties. They are neuropeptide ligands, for example neuropeptide receptor antagonists and in particular, they are selective neuropeptides Y Y5 receptor antagonists.
Accordingly, the compounds of formula I, their salts and esters can be used in the prophylaxis or treatment of of arthritis, cardiovascular diseases, diabetes, renal failure and particularly eating disorders and obesity.
Objects of the present invention are the compounds of formula I and their aforementioned salts and esters per se and their use as therapeutically active substances, a process for the manufacture of the said compounds, intermediates, pharmaceutical compositions, medicaments comprising the said compounds, their pharmaceutically acceptable salts and esters, the use of the said compounds, salts and esters for the prophylaxis and/or therapy of illnesses, especially in the treatment or prophylaxis of arthritis, cardiovascular diseases, diabetes, renal failure and particularly eating disorders such as hyperphagia and particularly obesity, and the use of the said compounds, salts and esters for the production of medicaments for the treatment or prophylaxis of arthritis, cardiovascular diseases, diabetes, renal failure and particularly eating disorders and obesity.
In the present description the term “alkyl”, alone or in combination, signifies a straight-chain or branched-chain alkyl group with 1 to 8 carbon atoms, preferably a straight or branched-chain alkyl group with 1 to 6 carbon atoms and particularly preferred a straight or branched-chain alkyl group with 1 to 4 carbon atoms Examples of straight-chain and branched C
1
-C
8
alkyl groups are methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert.-butyl, the isomeric pentyls, the isomeric hexyls, the isomeric heptyls and the isomeric octyls, preferably methyl and ethyl and most preferred methyl.
The term “cycloalkyl”, alone or in combination, signifies a cycloalkyl ring with 3 to 8 carbon atoms and preferably a cycloalkyl ring with 3 to 6 carbon atoms. Examples of C
3
-C
8
cycloalkyl are cyclopropyl, methyl-cyclopropyl, dimethylcyclopropyl, cyclobutyl, methyl-cyclobutyl, cyclopentyl, methyl-cyclopentyl, cyclohexyl, methyl-cyclohexyl, dimethyl-cyclohexyl, cycloheptyl and cyclooctyl, preferably cyclopropyl and particularly cyclopentyl.
The term “alkoxy”, alone or in combination, signifies a group of the formula alkyl-O— in which the term “alkyl” has the previously given significance, such as methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec. butoxy and tert.butoxy, 2-hydroxyethoxy, 2-methoxyethoxy preferably methoxy and ethoxy and most preferred methoxy.
The term “aryl”, alone or in combination, signifies a phenyl or naphthyl group, preferably a phenyl group which optionally carries one or more, particularly one to three substituents each independently selected from halogen, trifluoromethyl, amino, alkyl, alkoxy, aryloxy, alkylcarbonyl, cyano, carbamoyl, alkoxycarbamoyl, methylendioxy, carboxy, alkoxycarbonyl, aminocarbonyl, alkyaminocarbonyl, dialkylaminocarbonyl, hydroxy, nitrol and the like. Preferred substituents of aryl, preferably phenyl are independently selected from halogen, trifluoromethyl, alkyl, alkoxy, cyano and nitro. Examples of aryl are phenyl, cyanophenyl, methoxyphenyl, fluorophenyl and methylphenyl.
The term “aralkyl”, alone or in combination, signifies an alkyl or cycloalkyl group as previously defined, which is substituted with one or more, preferably one or two, particularly preferred one aryl group and, wherein the term aryl is defined as before. Examples are benzyl, benzyl substituted with hydroxy, alkoxy or halogen, preferably fluorine.
The term “heterocyclyl”, alone or in combination, signifies a saturated, partially unsaturated or aromatic 4- to 10-membered heterocycle which contains one or more, preferably one ore two hetero atoms selected from nitrogen, oxygen and sulfur, wherein oxygen and particularly nitrogen are preferred. If desired, it can be substituted on one or more carbon atoms by halogen, alkyl, alkoxy, oxo, alkoxyalkyl, hydroxyalkyl etc. and/or on a secondary nitrogen atom (i.e. —NH—) by alkyl, cycloalkyl, aralkoxycarbonyl, alkanoyl, phenyl or phenylalkyl or on a tertiary nitrogen atom (i.e. ═N—) by oxido, with halogen, alkyl, cycloalkyl and alkoxy being preferred. Examples of such heterocyclyl groups are pyridinyl, furyl, pyrrolidinyl, piperidinyl, morpholinyl, piperazinyl, 3,4-dihydro-1H-isoquinolinyl, thiophenyl and azepanyl, wherein each of these rings can be optionally substituted by one or more, preferably one substituent independen

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