Imidazopyridine derivatives as phosphodiesterase VII inhibitors

Details Imidazopyridine derivatives as phosphodiesterase VII inhibitors Imidazopyridine derivatives as phosphodiesterase VII inhibitors

2002-05-03

2003-09-02

Rotman, Alan L. (Department: 1625)

Drug, bio-affecting and body treating compositions

Designated organic active ingredient containing

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

Reexamination Certificate

active

06613778

ABSTRACT:

The invention relates to compounds of the formula I
in which
R
1
denotes CONR
4
R
5
,
R
2
denotes H or A,
R
4
and R
5
, independently of one another, each denote H or A
1
,
R
3
denotes Hal,
Hal denotes F, Cl, Br or I,
A denotes alkyl having 1-4 carbon atoms,
A
1
denotes alkyl having 1-10 carbon atoms,
X denotes alkylene having 1-4 carbon atoms, in which an ethylene group may also be replaced by a double or triple bond,
and their physiologically acceptable salts and/or solvates.
Other imidazopyridine derivatives having GABA-agonistic actions are disclosed, for example, in EP 82369.
The invention had the object of finding novel compounds having valuable properties, in particular those which can be used for the production of medicaments.
It has been found that the compounds of the formula I and their salts have very valuable pharmacological properties and are well tolerated.
In particular, they exhibit specific inhibition of “Rolipram insensitive” cAMP phosphodiesterase (PDE VII).
The biological activity of the compounds of the formula I can be determined by methods as described, for example, by M. A. Giembycz et al. in Br. J. Pharmacol. (1996), 118, 1945-1958.
The affinity of the compounds for cAMP phosphodiesterase (PDE VII) is determined by measuring their IC
50
values (concentration of the inhibitor that is required to achieve 50% inhibition of the enzyme activity). In order to carry out the determinations, homogenized SK-N-SH neuro-blastoma cells were used instead of T-lymphocytes, and PDE III inhibition was carried out using Cl-930. This is a selective PDE III inhibitor (J. A. Bristol et al., J. Med. Chem. 1984, 27(9), 1099-1101). Alternatively, SK-N-SH is replaced by HUT-78 and instead of using Cl-930 inhibition is carried out with trequensin (D. Ruppert et al., Life Sci. 31:2037, 1982).
The compounds of the formula I can be employed for the treatment of asthmatic illnesses.
The anti-asthmatic action can be determined, for example, analogously to the method of T. Olsson, Acta allergologica 26, 438-447 (1971).
Since cAMP inhibits osteoclastic cells and stimulates osteogenetic cells (S. Kasugai et al., M 681, and K. Miyamoto, M 682, in Abstracts of the American Society for Bone and Mineral Research, 18
th
Annual Meeting, 1996), the compounds of the formula I can be employed for the treatment of osteoporosis.
The compounds also exhibit an antagonistic action to the production of TNF&agr; (tumour necrosis factor) and are therefore suitable for the treatment of allergic and inflammatory diseases, autoimmune diseases, such as, for example, rheumatoid arthritis, multiple sclerosis, Crohn's disease, diabetes mellitus or ulcerative colitis, transplant rejection reactions, cachexia and sepsis.
The anti-inflammatory action of the substances of the formula I and their effectiveness for the treatment of, for example, autoimmune diseases.such as multiple sclerosis or rheumatoid arthritis can be determined analogously to the methods of N. Sommer et al., Nature Medicine 1, 244-248 (1995), or L. Sekut et al., Clin. Exp. Immunol. 100, 126-132 (1995).
The compounds can be employed for the treatment of cachexia. The anti-cachectic action can be tested in TNF-dependent models of cachexia (P. Costelli et al., J. Clin. Invest. 95, 2367 ff. (1995); J. M. Argiles et al., Med. Res. Rev. 17, 477 ff. (1997)).
The PDE VII inhibitors can also inhibit the growth of tumour cells and are therefore suitable for tumour therapy (for PDE IV inhibitors, cf. D. Marko et al., Cell Biochem. Biophys. 28, 75 ff. (1998)).
They can furthermore be employed for the therapy of sepsis and for the treatment of memory disorders, atherosclerosis, atopical dermatitis and AIDS, furthermore for the treatment of T cell-dependent diseases (L. Li et al., Science, 1999, 283, 848-851).
The compounds of the formula I can be employed as medicament active ingredients in human and veterinary medicine. They can furthermore be employed as intermediates for the preparation of further medicament active ingredients. In particular, the compounds of the formula I can be employed as medicament active ingredients for PDE VII inhibition in human and veterinary medicine.
The invention furthermore relates to the use of the compounds of the formula I for the preparation of a medicament for combating allergic diseases, asthma, chronic bronchitis, atopical dermatitis, psoriasis and other skin diseases, inflammatory diseases, autoimmune diseases, such as, for example, rheumatoid arthritis, multiple sclerosis, Crohn's disease, diabetes mellitus or ulcerative colitis, osteoporosis, transplant rejection reactions, cachexia, tumour growth or tumour metastases, sepsis, memory disorders, atherosclerosis and AIDS.
A denotes alkyl having 1-4 carbon atoms and has 1, 2, 3 or 4 carbon atoms and preferably denotes methyl, ethyl or propyl, furthermore preferably isopropyl, butyl, isobutyl, sec-butyl or tert-butyl. 1-7 H atoms in the radicals may also be replaced by F and/or Cl. A therefore also denotes, for example, trifluoromethyl or pentafluoroethyl.
A
1
denotes alkyl having 1-10 carbon atoms and has 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 carbon atoms and preferably denotes methyl, ethyl or propyl, furthermore preferably isopropyl, butyl, isobutyl, sec-butyl or tert-butyl, but also n-pentyl, neopentyl, isopentyl or hexyl. 1-7 H atoms in the radicals may also be replaced by F and/or Cl. A
1
therefore also denotes, for example, trifluoromethyl or pentafluoroethyl.
X denotes alkylene having 1-4 carbon atoms, preferably methylene, ethylene, propylene or butylene, in which one ethylene group may also be replaced by a double or triple bond. X therefore also denotes, for example, —CH
2
—CH═CH—H
2
— or —C≡—C—.
Accordingly, the invention relates, in particular, to those compounds of the formula I in which at least one of said radicals has one of the preferred meanings indicated above. Some preferred groups of compounds may be expressed by the following sub-formulae Ia to Ic, which correspond to the formula I and in which the radicals not designated in greater detail have the meaning indicated in the formula I, but in which
in Ia
R
3
denotes Cl;
in Ib
R
3
denotes Cl,
X
denotes alkylene having 1-4 carbon atoms;
in Ic
R
3
denotes Cl,
X
denotes alkylene having 1, 2, 3 or 4 carbon atoms,
A
1
denotes alkyl having 1, 2, 3 or 4 carbon atoms.
The compounds of the formula I and also the starting materials for their preparation are prepared, in particular, analogously as described in EP 82369 on page 3, left-hand column, line 18, to page 4, column 6, line 16, or in Example 1.
The compounds of the formula I and also the starting materials for their preparation are, in addition, prepared by methods known per se, as described in the literature (for example in the standard works, such as Houben-Weyl, Methoden der organischen Chemie [Methods of Organic Chemistry], Georg-Thieme-Verlag, Stuttgart), to be precise under reaction conditions which are known and suitable for said reactions.
A base of the formula I can be converted into the associated acid-addition salt using an acid, for example by reaction of equivalent amounts of the base and the acid in a suitable solvent, such as ethanol, followed by evaporation. Suitable acids for this reaction are, in particular, those which give physiologically acceptable salts. Thus, it is possible to use inorganic acids, for example sulfuric acid, nitric acid, hydrohalic acids, such as hydrochloric acid or hydrobromic acid, phosphoric acids, such as orthophosphoric acid, sulfamic acid, furthermore organic acids, in particular aliphatic, alicyclic, araliphatic, aromatic or heterocyclic mono- or polybasic carboxylic, sulfonic or sulfuric acids, for example formic acid, acetic acid, propionic acid, pivalic acid, diethylacetic acid, malonic acid, succinic acid, pimelic acid, fumaric acid, maleic acid, lactic acid, tartaric acid, malic acid, citric acid, gluconic acid, ascorbic acid, nicotinic acid, isonicotinic acid, methane- or ethanesulfonic acid, ethanedisulfonic acid, 2-hydroxyethane-sulfonic acid, benzenesulfonic ac

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