Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Reexamination Certificate
1999-04-20
2002-06-25
Jones, Dwayne C. (Department: 1614)
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
C514S663000, C514S665000
Reexamination Certificate
active
06410792
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention is a method for inhibiting the neuropeptide Y (“NPY”) Y5 receptor using a class of amide derivatives. As antagonists of the Y5 receptor, the amide derivatives are useful in treating obese mammals, mammals with bulimia, for treating mammals with obesity related disorders including, but not limited to type II diabetes, insulin resistance hyperlipidemia, hypertension, polycystic ovarian disease, pulmonary disease, sleep apnea, and for treating mammals suffering from NPY Y5 receptor inhibition related disorders such as memory disorders, epilepsy, dyslipidemia, and depression.
2. Description of the Art
NPY is a 36 amino acid peptide that is a member of a larger peptide family which includes peptide YY (PYY), and pancreatic peptide (PP). NPY is highly conserved in a variety of animal, reptile and fish species and is found mainly in the central and peripheral sympathetic neurons. Furthermore, NPY is the most prevalent peptide in the mammalian brain where it is found primarily in the limbic regions. NPY has been found to elicit a number of physiological responses including appetite stimulation, anxiolysis, hypertension, and regulation of coronary tone.
NPY is believed to stimulate food intake by activating a hypothalamic eating receptor. Hu et al., J. Bio. Chem., Vol. 271, No. 42 pp.26315-319 (1996) discloses the isolation and identification and the expression cloning of a novel Y-type receptor from rat hypothalamus which the authors designated Y5. According to Hu et al., the localization of Y5 mRNA in critical areas of the brain hypothalamus and other brain regions known to regulate food intake together with an in vitro pharmacological profile consistent with the in vivo feeding data leads those skilled in the art to believe that the Y5 receptor is a primary mediator of NPY-induced feeding. A human homologue of the Y5 receptor has also been identified by Gerald et al., Nature, 382:168-171 (1996) which discloses the isolation, expression and analysis of an NPY Y5 receptor from the rat hypothalamus.
Antagonists of NPY receptors other than the Y5 receptors have been identified. For example, U.S. Pat. No. 5,554,621 discloses NPY antagonists that act on the Y1, Y2, Y3 and other Y1-like or Y4-type receptors. The reported antagonists are dihydropyridine based substituents.
U.S. Pat. No. 5,506,248 also discloses NPY receptor antagonists. The compositions disclosed each include sulphamadyl and amidino radicals. The disclosed compositions do not include amide moieties.
WO 96/16542 discloses genetically modified NPY receptors.
There is evidence that the Y5 receptor of NPY has a pharmacological feeding profile that is unique in comparison to other NPY receptors, namely, Y1, Y2, Y3 and Y4/PP1 because the Y5 receptor response correlates well with in vivo potencies of the standard peptides in the stimulation of feeding. Furthermore, antagonists of other NPY receptors such as Y1 do not necessarily exhibit an inhibitory response when assayed against Y5. In view of the knowledge that NPY plays an important role in eating and other disorders and in view of the knowledge that the Y5 receptor plays an important and unique role in the mechanism of such disorders, there is, therefore, a great need for antagonists of the NPY Y5 receptor. Furthermore, there is a need for antagonists of NPY that specifically target the Y5 receptor.
SUMMARY OF THE INVENTION
The present invention relates to methods for using amide derivatives that are NPY Y5 receptor antagonists to treat NPY mediated disorders including eating disorders such as bulimia and obesity. The present invention also includes novel amide derivatives. The amide derivative described immediately below, except for compounds 330-362 disclosed in Table 4 are novel, while all of the compounds described below, including compounds 137-188 disclosed in Table 4 are useful in the methods disclosed herein.
One object of this invention is a novel class of amide derivatives having the formula
except that compounds of this invention do not include compounds 330-362 identified in Table 4.
Another object of this invention is a method for treating obesity, obesity related disorders and eating disorders in mammals using a therapeutically effective amount of a composition heretofore unknown for its NPY Y5 inhibitory properties.
It is another object of this invention to provide a method for the effective treatment of diseases that include the NPY Y5 receptor in their mechanism.
It is still another object of this invention to provide a method for the treatment of obesity and bulimia in humans using a new class of amide derivatives.
Another object of this invention are novel amide derivatives of the compound of formula (I) that are useful as NPY Y5 receptor antagonists and therapeutic compositions containing the same.
In one embodiment, this invention is a method for treating mammalian disorders mediated by the NPY Y5 receptor comprising the administration to a mammal of a therapeutically effective amount of at least one compound of formula (I) or pharmaceutically acceptable salts thereof wherein R
1
-R
5
, are each individually selected from the group of substituents including hydrogen, halogen, hydroxyl, thiol, lower alkyl, substituted lower alkyl, alkenyl, alkynyl, alkylalkenyl, alkyl alkynyl, alkoxy, alkylthio, acyl, aryloxy, amino, amido, carboxyl, aryl, substituted aryl, heterocycle, heteroaryl, substituted heterocycle, heteroalkyl, cycloalkyl, substituted cycloalkyl, alkylcycloalkyl, alkylcycloheteroalkyl, nitro, and cyano.
In another embodiment, this invention is a method for treating mammalian disorders mediated by the NPY Y5 receptor comprising the administration to a mammal of a therapeutically effective amount of at least one compound having the general formula described above.
In yet another embodiment, this invention is a pharmaceutical dosage form comprising at least one amide derivative of a compound of formula (I) and at least one pharmaceutical additive.
DESCRIPTION OF THE CURRENT EMBODIMENT
The present invention relates to novel compositions that are NPY Y5 receptor antagonists and methods for using the compositions to treat NPY mediated disorders including eating disorders such as bulimia and obesity. Useful compositions of this invention are amide derivatives having the formula:
In the composition, R
1
-R
5
are each individually selected from the group of substituents including hydrogen, halogen, hydroxyl, thiol, lower alkyl, substituted lower alkyl, alkenyl, alkynyl, alkylalkenyl, alkyl alkynyl, alkoxy, alkylthio, acyl, aryloxy, amino, amido, carboxyl, aryl, substituted aryl, heterocycle, heteroaryl, substituted heterocycle, heteroalkyl, cycloalkyl, substituted cycloalkyl, alkylcycloalkyl, alkylcycloheteroalkyl, nitro, and cyano. R
1
is preferably selected from: cyclohexyl; benzoyl; phenyl; phenyl substituted at least once with a lower alkyl that is in turn substituted at least once with a substituent selected from cycloalkyl, alkoxy, furan, oxo, phenyl, diisopropylamine, alkoxy, or mixtures thereof, lower alkyl, alkyl substituted at least once by oxo, phenyl, or by mixtures thereof, phenyl substituted alkene, carboxamide, carboalkoxy, methyl substituted carbophenoxy, phenyldiazo, halogen, nitro, trifluoroalkyl, amino, phenyl substituted amino, lower alkyl substituted amino, aminoacyl, sulfonylphenyl, hydroxy, alkoxy, fluoro substituted phenyl, oxazole, phenoxy, thioalkoxy, and mixtures thereof; hydroxy or alkoxy substituted naphthyl; 1H-indazole; fluorenone; fluorene; and phenyl.
R
2
is preferably hydrogen, or a lower alkyl.
R
3
is preferably hydrogen or lower alkyl, phenyl, and most preferably hydrogen.
R
4
is preferably hydrogen or lower alkyl, phenyl, and most preferably hydrogen or methyl.
R
5
is preferably selected from substituents including: pyrrolidine; pyrrolidine substituted at least once by amino, acylamino, trifluoroacylamino, hydroxyl, carboxyl, carbobenzyloxyamino, carbomethoxyamino, carbotertbutoxyamino, alkyl substituted carbotertbutoxyamino, pyridine, lower alk
Connell Richard D.
Ladouceur Gaetan H.
Lease Timothy G.
Osterhout Martin H.
Bayer Corporation
Jones Dwayne C.
McDonnell & Boehnen Hulbert & Berghoff
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