EP0778769A1

EP0778769A1 - Use of 5-substituted pyridine and hexahydroquinoline-3 carboxylic acid derivatives for treating diseases of the central nervous system

Info

Publication number: EP0778769A1
Application number: EP95929876A
Authority: EP
Inventors: Klaus Urbahns; Hans-Georg Heine; Bodo Junge; Rudolf Schohe-Loop; Henning Sommermeyer; Thomas Glaser; Reilinde Wittka; Jean-Marie-Viktor De Vry
Original assignee: Bayer AG
Current assignee: Bayer AG
Priority date: 1994-08-29
Filing date: 1995-08-16
Publication date: 1997-06-18
Also published as: US6194428B1; JPH10504831A; ID17988A; IL115073A0; IL115073A; WO1996006610A1; ZA957188B; TW401299B; AU3346095A; DE4430639A1; CA2198495A1

Abstract

Partially known 5-substituted pyridine and hexahydroquinoline-3 carboxylic acid derivatives are used to prepare medicaments used in particular for treating diseases of the central nervous system.

Description

USE OF 5-SUBSTITUTED PYRIDINE AND HEXAHYDR0CHIN0LIN-3-CARBONIC ACID DERIVATIVES FOR THE TREATMENT OF DISEASES OF THE CENTRAL SYSTEM

The present invention relates to the use of 5-substituted pyridine and hexahydroquinoline-3-carboxylic acid derivatives for the production of medicaments, new active substances, a process for their preparation and their use, in particular for the treatment of diseases of the central nervous system.

From publications J. Chromatogr., 565 (1-2), 237-46, 1991; J. Pharmacol. Exp. Ther. 250 (2), 632-6, 1989; Drug metab. Dispos. 14 (5), 613-18, 1986 and Acta Pharm. Suec, 21 (6), 331-44, 1984 are already furo [3,4-b] pyridine-3-carboxylic acid 4- (2,3-dichlorophenyl) ) -5,7-dihydro-2-methyl-5-oxo-ethyl ester is known.

It has now been found that the 5-substituted pyridine and hexahydroquinoline-3-carboxylic acid derivatives of the general formula (I)

in which

A represents aryl with 6 to 10 carbon atoms or pyridyl, which are optionally up to 3 times the same or different substituted by nitro, cyano, halogen, trifluoromethyl or by straight or branched alkyl, alkoxy or alkylthio having up to 6 carbon atoms ,

R ^{1 represents} hydrogen or straight-chain or branched alkyl with up to 8

Carbon atoms, D and E together for

-CO-O-CH ₂ - [CR ² R ³ ] _a -, -CO-NR ⁴ - [CR ² R ³ ] _a -CH ₂ -, -CO-CH ₂ - [CR ² R ³ ] _a -CH ₂ - or -CH ₂ - [CR ² R ³ ] _a -O-CO-,

wherein

R ² , R ³ and R ^{4 are the} same or different and are hydrogen or methyl,

a is a number 0 or 1

and their salts,

Surprisingly, they have a modulating effect on potassium channels and are therefore suitable for the treatment of diseases of the central nervous system and the diseases of anemia.

In the context of the invention, physiologically acceptable salts are preferred. Physiologically acceptable salts are generally salts of the invention

Compounds with inorganic or organic acids. Salts with inorganic acids such as, for example, hydrochloric acid, hydrobromic acid, phosphoric acid or sulfuric acid, or salts with organic carboxylic or sulfonic acids such as, for example, acetic acid, maleic acid, fumaric acid, apple acid, citric acid, tartaric acid, lactic acid, benzoic acid, or methanesulfonic acid, are preferred,

Ethanesulfonic acid, phenylsulfonic acid, toluenesulfonic acid or naphthalenedisulfonic acid

The compounds according to the invention can exist in stereoisomeric forms which either behave like image and mirror image (enantiomers) or do not behave like image and mirror image (diastereomers). The invention relates to both the antipodes and the racemic forms and the diastereomer mixtures

Compounds of the general formula (I) are preferred in which

A represents phenyl, naphthyl or pyridyl, optionally up to 3 times the same or different by nitro, cyano, fluorine, chlorine, bromine, iodine, trifluoromethyl or by straight-chain or branched alkyl, alkoxy or alkylthio with up to 4 carbon atoms are substituted,

R ^{1 represents} hydrogen or straight-chain or branched alkyl having up to 6 carbon atoms,

D and E together for

wherein

R ² , R ³ and R ^{4 are the} same or different and are hydrogen or methyl,

a represents a number 0 or 1,

and their salts,

used in combating cerebral diseases.

Compounds of the general formula (I) are particularly preferred

in which

A represents phenyl or pyridyl, which are optionally substituted up to 2 times, identically or differently, by nitro, cyano, fluorine, chlorine, bromine, iodine, trifluoromethyl or by methyl, methoxy or methylthio, R ^{1 represents} hydrogen or straight-chain or branched alkyl having up to 4 carbon atoms,

D and E together for -CO-O-CH ₂ - [CR ² R ³ ] _a -,

-CO-NR ⁴ - [CR ² R ³ ] _a -CH ₂ -, -CO-CH ₂ - [CR ² R ³ ] _a -CH ₂ - or -CH ₂ - [CR ² R ³ ] _a -O- CO- stand,

wherein

R ² , R ³ and R ^{4 are the} same or different and are hydrogen or methyl,

a represents a number 0 or 1,

and their salts,

used in combating cerebral diseases

The compounds of general formula (I) according to the invention show an unforeseeable, valuable pharmacological spectrum of action

They are modulators of channels with selectivity for calcium-dependent potassium channels of high conductivity (BK (Ca) channels), in particular of the central nervous system

Due to their pharmacological properties, they can be used in the manufacture of medicines for the treatment of central degenerative diseases, such as when dementia such as multi-infarct dementia occurs

(MID), primary degenerative dementia (PDD), pre-senile and senile dementia of the type of Alzheimer's disease, HIV dementia and other forms of dementia, and also for the treatment of Parkinson's disease or amyotrophic lateral sclerosis and multiple sclerosis The active ingredients are also suitable for the treatment of brain performance disorders in old age, organic brain psychosyndrome (HOPS, Organic Brain Syndrome, OBS) and age-related memory disorders (AAMI).

They are suitable for prophylaxis, treatment and for combating the consequences of cerebral circulatory disorders such as cerebral ischemia, strokes, traumatic brain injuries and subarachnoid hemorrhages.

They are valuable for the treatment of depression and psychoses, e.g. Schizo¬ phrenia. They are also suitable for the treatment of disorders of neuroendocrine secretion and of neurotransmitter secretion and related health disorders such as mania, alcoholism, drug abuse, addiction or pathological eating behavior. Other areas of application are the treatment of migraines, sleep disorders and neuropathies. They are also suitable as pain relievers.

The active ingredients are also suitable for treating disorders of the immune system, in particular T lymphocyte proliferation and for influencing smooth muscles, in particular the uterus, urinary bladder and bronchial tract and for treating related diseases such as e.g. Asthma and urinary incontinence and used to treat hypertension, arrhythmia, angina and diabetes.

The invention also relates to new compounds of the general formula (Ia)

and their salts, with the substituent meanings given in the following table:

R ¹ LT DE

-CH ₃ 4-C1 H -CO-O-CH ₂ -

-CH (CH ₃ ) ₂ 4-C1 H -CO-O-CH ₂ -

-CH (CH ₃ ) ₂ 2-C1 3-C1 -CO-O-CH ₂ -

-CH ₃ 4-C1 H -CO-NH-CH ₂ -

-CH (CH ₃ ) ₂ 4-C1 H -CO-NH-CH ₂ -

-CH ₃ 2-C1 3-C1 -CO-NH-CH ₂ -

-CH (CH ₃ ) ₂ 2-C1 3-C1 -CO-NH-CH ₂ -

-CH ₃ 4-C1 H -CO-CH ₂ -CH ₂ -CH ₂ -

-CH (CH ₃ ) ₂ 4-C1 H -CO-CH ₂ -CH ₂ -CH ₂ -

-CH ₃ 2-C1 3-C1 -CO-CH ₂ -CH ₂ -CH ₂ -

-CH (CH ₃ ) ₂ 2-C1 3-C1 -CO-CH ₂ -CH ₂ -CH ₂ -

-CH (CH ₃ ) ₂ 2-C1 3-C1 -CO-CH ₂ -C (CH ₃ ) ₂ -CH ₂

-CH ₃ 3-H 4-C1 -CO-CH ₂ -C (CH ₃ ) ₂ -CH ₂

-CH ₃ 2-C1 3-C1 -CO-CH ₂ -C (CH ₃ ) ₂ -CH ₂

-CH (CH ₃ ) ₂ 3-C1 4-C1 -CO-O-CH ₂ -

-CH ₃ 2-F 3-F -CO-O-CH ₂ -

-CH ₃ 4-F 3-H -CO-O-CH ₂ -

-CH ₃ 2-F 6-C1 -CO-O-CH ₂ -

-CH ₃ 3-H 4-C1 -CH ₂ -O-CO-

-CH (CH ₃ ) ₂ 2-C1 3-C1 -CH ₂ -O-CO-

-CH (CH ₃ ) ₂ 3-H 4-C1 -CH ₂ -O-CO-

-CH ₃ 2-C1 3-C1 -CH ₂ -O-CO-

The compounds of general formulas (I) and (Ia) are prepared by:

[A] if D and E together represent -CO-NR ⁴ - [CR ² R ³ ] _a -CH ₂ -,

the dihydropyridines of the formula (II)

woπn

R ¹ and A have the meaning given and

R ^{5 represents} C _r C ₄ alkyl,

oxidized in inert solvents to the corresponding pyridine and this then blown with hydrazine hydrate to give the lactam and optionally alkylating the nitrogen,

or

[B] in the case where D and E together for -CO-O-CH ₂ - [CR ² R ³ ] _a -,

-CO-CH ₂ - [CR ² R ³ ] _a -CH ₂ - or -CH ₂ - [CR ² R ³ ] _a -O-CO,

the corresponding dihydropyridines oxidized.

The processes according to the invention can be illustrated by the following formula schemes:

N ₂ H ₄ x H ₂ 0

Suitable solvents for the process are all inert organic solvents which do not change under the reaction conditions. These preferably include alcohols such as methanol, ethanol, propanol or isopropanol, or ethers such as diethyl ether, dioxane, tetrahydrofuran, glycol dimethyl ether, or diethylene glycol dimethyl ether, acetonitrile, or Amides such as hexamethylphosphoric triamide or dimethylformamide, or acetic acid or halogenated carbon Hydrogen such as methylene chloride, carbon tetrachloride or hydrocarbons such as benzene or toluene. It is also possible to use mixtures of the solvents mentioned. Isopropanol, ethanol, tetrahydrofuran, methanol, methylene chloride and dimethylformamide are particularly preferred.

Suitable oxidizing agents are generally 2,3-dichloro-4,5-dicyan-p-benzoquinone and derivatives, pyridinium dichromate, elemental bromine, iodine and manganese dioxide. Manganese dioxide is preferred.

The oxidizing agent is generally used in an amount of 1 mol to 20 mol, preferably 1 mol to 5 mol, in each case based on 1 mol of the dihydropyridines. In the case of MnO ₂ , 5 to 20 times the amount by weight is added.

The solvents listed above are suitable as solvents for the oxidation, with methylene chloride being preferred.

The reaction temperatures can be varied over a wide range. Generally one works between + 10 ° C and + 150 ° C, preferably between + 20 ° C and + 100 ° C, especially at room temperature.

The reactions can be carried out at normal pressure, but also at elevated or reduced pressure (e.g. 0.5 to 3 bar). Generally one works at normal pressure.

The carboxylic acid esters are saponified by customary methods, by treating the esters with customary bases in inert solvents.

The reaction with hydrazine hydrate and the alkylation are carried out by customary methods.

^ Rubidium efflux from C6-BUl glioma cells

The experiments were carried out with minor changes in accordance with that of Tas et al. (Neurosci. Lett. 94, 279-284, (1988)). Rats C6-BUl glioma cells are used for this. From the through Data obtained from liquid scintillation is used to calculate the increase in Rb eflux caused by lonomycin over the Basalef lux and set as 100%. The stimulations in the presence of test substances are then related to this value.

The present invention also includes pharmaceutical preparations which, in addition to inert, non-toxic, pharmaceutically suitable auxiliaries and excipients, contain one or more compounds of the general formulas (I) / (Ia) or which consist of one or more active compounds of the formulas ( I) and (Ia) exist, as well as processes for the preparation of these preparations.

The active compounds of the formulas (I) / (Ia) should be present in these preparations in a concentration of 0.1 to 99.5% by weight, preferably 0.5 to 95% by weight, of the total mixture .

In addition to the active ingredients of the formulas (I) / (Ia), the pharmaceutical preparations can also contain other pharmaceutical active ingredients.

The pharmaceutical preparations listed above can be prepared in a customary manner by known methods, for example using the or the

Auxiliaries or carriers.

In general, it has proven to be advantageous to use the active ingredient (s) / (Ia) in total amounts of from about 0.01 to about 100 mg / kg, preferably in total amounts of from about 1 mg / kg to 50 mg / kg Body weight per 24 hours, if necessary in the form of several single doses, to achieve the desired result.

However, it may be advantageous to deviate from the amounts mentioned, depending on the type and body weight of the object being treated, on the individual behavior towards the medicament, the type and severity of the disease, the type of preparation and Application, as well as the time or interval at which the administration takes place. Running agent:

a Methylene chloride / AcOEt 10 + 1 b Methylene chloride / MeOH 10 + 1 c PE / AcOEt 7 + 3 d PE / AcOEt 1 + 1

Output connections

Example I

l, 4,5,7-tetrahydro-4- (4-chlorophenyl) -2-methyl-5-oxo-furo [3,4-b] -pyπdιn-3-carbonic acid methyl ester

3 g (21.3 mmol) of 4-chlorobenzaldehyde, 4.0 g (21.3 mmol) of 4-acetoxyacetessιgsaure- ethyl ester and 2.5 g (21.3 mmol) of 3-Amιnocrotonsauremethylester are dissolved in 40 ml of isopropanol and 12 h heated to reflux Then 10 ml of dilute aqueous HCl is added and the mixture is heated to reflux for a further 30 min. The batch is partitioned between toluene and water. Drying (MgSO ₄ ) and concentration of the organic phase yields a white solid which, by filtration, over 50 g

Silica gel (ethyl acetate / petroleum ether 1 + 1) and subsequent recrystallization from ethyl acetate / petroleum ether is purified. 2.6 g (8.13 mmol, 38%) are obtained.

Example II

4- (2,3-dichlorophenyl) -3-ethoxycarbonyl-5-methoxycarbonyl-6-methyl-2-phthalimidomethyl-1,4-dihydropyridine

4.4 g (25 mmol) of 2,3-dichlorobenzaldehyde, 6.9 g (25 mmol) of 4-N-phthalimido-3-oxobutanoic acid ethyl ester and 2.9 g (25 mmol) of 3-aminocrotonic acid methyl ester are dissolved in 25 ml of abs . Dissolved ethanol and heated to reflux for 12 h. The product partially precipitates on cooling to RT. The precipitation is completed by adding 50 ml of petroleum ether. It is suctioned off and washed with ether. Yield 4.79 g.

Example DI

4- (2,3-dichlo henyl) -3-ethoxycarbonyl-5-methoxycarbonyl-6-methyl-2-phthalimido-methylpyridine

Analogously to the procedure for Example I, 2.3 g (4.3 mmol) of the compound from Example II are oxidized by 10 g of manganese dioxide at RT for 1 h to 2.0 g (88% of theory) of the title compound.

Example IV

Isopropyl 4- (2,3-dichlorophenyl) -2-methyl-5-oxo-l, 4,5,6,7,8-hexahydroquinoline-3-carboxylate

H 3.50 g (20 mmol) of 2,3-dichlorobenzaldehyde, 2.24 g (20 mmol) of dihydroresorcinol and 2.86 g (20 mmol) of 3-aminocrotonic acid isopropyl ester are dissolved in 100 ml of isopropanol and stirred at reflux for 5 h. The product fails. 50 ml of water are added, and the mixture is cooled to RT. It is suctioned off and washed successively with isopropanol, ethanol and ether. 5.8 g (74% of theory) of the title compound are obtained.

Example V

4- (2,3-dichlorophenyl) -5-oxo-2,7,7-trimethyl-1, 4.5, 6.7, 8-hexahydroquinoline-3-carboxylic acid isopropyl ester

3.50 g (20 mmol) of 2,3-dichlorobenzaldehyde, 2.80 g (20 mmol) of dimedone and 2.86 g (20 mmol) of 3-aminocrotonic acid isopropyl ester are dissolved in 100 ml of isopropanol and stirred at reflux for 5 h. The product fails. 50 ml of water are added, and the mixture is cooled to RT. It is suctioned off and washed successively with isopropanol, ethanol and ether. 6.6 g (78% of theory) of the title compound are obtained.

Example VI

2-azido-γ-butyrolactone

1.56 g (10 mmol) of 2-bromo-γ-butyrolactone are dissolved in 2 ml of dimethylformamide and 612 mg (12.5 mmol) of lithium azide are added at 0 ° C. The mixture is stirred for 2 hours at room temperature, water is added and the mixture is extracted three times with methylene chloride. The combined organic phases are washed three times with water, dried over sodium sulfate and concentrated. 1.10 g (86.6% of theory) of the title compound MS 127 are obtained

Example VD

2-amino-γ-but-2-en-yrolactone

1.02 g is added dropwise at 20 ° C. to a solution of 50 g sodium in 5 ml ethanol

(0.8 mmol) of the compound from Example VI in 2 ml of ethanol is stirred for 30 min at room temperature and concentrated under reduced pressure. The precipitated solid is stirred out in a little cold ethanol and the residue is dissolved in hot ethyl acetate. The solution is filtered and concentrated. 350 mg (44% of theory) of a colorless solid are obtained

MS 99

Example VUI

l, 4,5,7-tetrahydro-4- (4-chlorophenyl) -2-methyl-7-oxo-furo [3,4-b] pyridine-3-carbon acid sopropy 1 ester

9.0 g (30 mmol) of isopropyl 2,3-dichlorobenzylideneacetoacetate and 3.0 g (30 mmol) of the compound 2-amino-γ-but-2-en-yrolactone are dissolved in 60 ml of isopropanol and mixed with 1.7 ml ( 30 mmol) AcOH added. The mixture is kept under reflux for 20 h. The mixture is then concentrated and the residue is purified over 100 g of silica gel 60 (ethyl acetate / petroleum ether 10: 1, then 5: 1). The resulting material is recrystallized from ether. 4.08 g (36% of theory) of the title compound are obtained. MS: 381

Manufacturing examples

example 1

Isopropyl 4- (2,3-dichlorophenyl) -2-methyl-5-oxo-5,6,7,8-tetrahydroquinoline-3-carboxylate

1.5 g (3.8 mmol) of the compound from Example IV are dissolved in 350 ml of CH ₂ C1 ₂ and 7.5 g of MnO _{2 are} added. The mixture is refluxed for 2 h, suction filtered over Celite and concentrated. The residue is purified by MPLC (methylene chloride / ethyl acetate 10 + 1). After recrystallization first from ether / petroleum ether and then from isopropanol / petroleum ether, 0.72 g (48% of theory) of the title compound is obtained.

MS: 391

Example 2

5,7-Dihydro-4- (2,3-dichloro-phenyl) -2-methyl-5-oxo-pyrrolo- [3,4-b] -pyridine-3-carbonic acid methyl ester

1.9 g (3.6 mmol) of the compound from Example III are slurried in 100 ml of ethanol and 0.5 ml (10 mmol) of hydrazine hydrate are added. After 30 min. Stirring at RT creates a clear solution. After 30 min. Reflux precipitates a white solid. Allow to cool and suction filtered. The solid is purified chromatographically (methylene chloride ethyl acetate 20 + 1) and finally recrystallized from ethanol. 0.56 g (44%) is obtained.

Example 3

5,7-Dihydro-4- (4-chlorophenyl) -2-methyl-5-oxo-furo [3,4-b] pyridine-3-carboxylic acid, methyl ester

Analogously to Example 1, 1.33 g (4.16 mmol) of 1,4,5,7-tetrahydro ~ 4- (4-chlorophenyl) -2-methyl-5-oxo-furo [3,4-b ] -pyridine-3-carboxylic acid methyl ester by oxidation with MnO ₂ in CH ₂ C1 _2, the title compound in 1.01 g (76% of theory) yield.

Example 4

4- (2,3-dichlorophenyl) -2,7,7-trimethyl-5-oxo-5,6,7,8-tetrahydroquinoline-3-carboxylic acid isopropyl 1 ester

1.6 g (3.8 mmol) of the compound from Example V are dissolved in 350 ml of CH ₂ C1 ₂ and 7.5 g of MnO _{2 are} added. The mixture is refluxed for 2 h, suction filtered over Celite and concentrated. The residue crystallizes from ether / petroleum ether. 1.1 g (69% of theory) of the title compound are obtained. MS: 419

The compounds listed in Tables 1, 2 and 3 are prepared in analogy to the production processes described above:

Table 1:

Table 2:

E.g. no. χ, γ R ¹ yield Rf ^* MS (% of theory)

12 4-C1 -CH ₃ 47 0.45 / a 329

13 4-C1 -CH (CH ₃ ) ₂ 81 0.34 / a 357

14 2-Cl, 3-Cl -CH ₃ 38 0.52 / a 363

Table 3:

E.g. no. X / Y yield (% of theory)

15 4-C1 / H 73 0.67 / a

16 2-Cl, 3-Cl 65 0.71 / a Example 17

5,7-Dihydro-4- (4-chlorophenyl) -2-methyl-7-oxo-furo [3,4-b] pyridine-3-carboxylic acid, methyl ester

According to Example 1, 1.5 g (3.92 mmol) l, 4,5,7-tetrahydro-4- (4-chlorophenyl) -2-methyl-7-oxo-furo [3,4-b] -pyridine-3-carboxylic acid methyl ester in 350 ml of methylene chloride with 7.5 g of manganese dioxide to 0.94 g (63% of theory) of the title compound. MS: 380 R _j - = 0.57 (methylene chloride / ethyl acetate 10 + 1)

In analogy to the specification of Example 17, those listed in Table 4 are listed

Connections established:

Table 4:

The compounds listed in Table 5 are prepared in analogy to the procedure of Example 2:

Table 5:

Claims

claims

1. Use of 5-substituted pyridine and hexahydroquinoline-3-carboxylic acid derivatives of the general formula (I)

in which

A represents aryl having 6 to 10 carbon atoms or pyridyl, which are optionally substituted up to 3 times identically or differently by nitro, cyano, halogen, trifluoromethyl or by straight-chain or branched alkyl, alkoxy or alkylthio having up to 6 carbon atoms,

R ^{1 represents} hydrogen or straight-chain or branched alkyl having up to 8 carbon atoms,

D and E together for -CO-O-CH ₂ - [CR ² R ³ ] _a -,

wherein

R ² , R ³ and R ^{4 are the} same or different and are hydrogen or methyl, and

a represents a number 0 or 1 and their salts,

for the manufacture of medicinal products for the treatment of diseases of the central nervous system.

2. Use of 5-substituted pyridine and hexahydroquinoline-3-carboxylic acid derivatives of the formula (I) according to Claim 1,

wherein

A represents phenyl, naphthyl or pyridyl, which may be up to 3 times the same or different by nitro, cyano, fluorine, chlorine, bromine, iodine, trifluoromethyl or by straight-chain or branched alkyl, alkoxy or alkylthio with up to 4 carbon atoms are substituted,

D and E together for

wherein

R ² , R ³ and R ^{4 are the} same or different and are hydrogen or methyl,

a represents a number 0 or 1,

and their salts, for the manufacture of medicinal products for the treatment of diseases of the central nervous system.

3. Use of 5-substituted pyridine and hexahydroquinoline-3-carboxylic acid derivatives of the formula (I) according to Claim 1,

wherein

A represents phenyl or pyridyl, which may be identical or different up to 2 times through nitro, cyano, fluorine, chlorine, bromine

Iodine, trifluoromethyl or substituted by methyl, methoxy or methyl thio,

R ^{1 represents} hydrogen or straight-chain or branched alkyl having up to 4 carbon atoms,

D and E together for

-CO-O-CH ₂ - [CR ² R ³ ] _a -, -CO-NR ⁴ - [CR ² R ³ ] _a -CH ₂ -, -CO-CH ₂ - [CR ² R ³ ] _a -CH ₂ - or

-CH ₂ - [CR ² R ³ ] _a -O-CO-,

wherein

R ² , R ³ and R ^{4 are the} same or different and are hydrogen or

Methyl mean

a represents a number 0 or 1,

and their salts,

4. Use according to claims 1 to 3 for the manufacture of medicaments for the treatment of central degenerative diseases.

5. Use according to claim 1 to 3 for the manufacture of medicaments for the treatment of performance disorders in old age.

6. Use according to claim 1 to 3 for the manufacture of medicaments for the treatment of depression and psychoses.

7. 5-Substituted pyridine and hexahydroquinoline-3-carboxylic acid derivatives

Line:

5,7-dihydro-4- (4-chlorophenyl) -2-methyl-5-oxo-furo [3,4-b] pyridine-3-carboxylic acid, methyl ester,

5,7-dihydro-4- (2,3-dichlorophenyl) -2-methyl-5-oxopyrrolo [3,4-b] pyridine-3-carboxylic acid methyl ester,

4- (2,3-dichlorophenyl) -2-methyl-5-oxo-5,6,7,8-tetrahydroquinoline-3-carboxylic acid isopropyl 1 ester,

4- (2,3-dichlorophenyl) -2,7,7-trimethyl-5-oxo-5,6,7,8-tetrahydroquinoline-3-carboxylic acid isopropyl ester, 5,7-dihydro-4- (4-chlorophenyl) - 2-methyl-7-oxo-furo [3,4-b] pyridine-3-carboxylic acid isopropy 1 ester,

5,7-dihydro-4- (2,3-dichlorophenyl) -2-methyl-5-oxo-furo [3,4-b] pyridine-3-carboxylic acid isopropyl 1 ester,

5,7-dihydro-4- (3,4-dichlorophenyl) -2-methyl-5-oxo-furo [3,4-b] pyridine-3-carboxylic acid isopropyl ester,

5,7-dihydro-4- (2,3-difluorophenyl) -2-methyl-5-oxo-furo [3,4-b] pyridine-3-carboxylic acid, ethyl ester,

5,7-Dihydro-4- (4-fluorophenyl) -2-methyl-5-oxo-furo [3,4-b] pyridine-3-carboxylic acid methyl ester, 5,7-dihydro-4- (2- chloro-6-fluoro-phenyl) -2-methyl-5-oxo-furo [3,4-b] pyridine-

3-carboxylic acid methyl ester,

5,7-dihydro-4- (4-chlorophenyl) -2-methyl-5-oxopyrrolo [3,4-b] pyridine-3-carboxylic acid methyl ester,

5,7-dihydro-4- (4-chlorophenyl) -2-methyl-5-oxopyrrolo [3,4-b] pyridine-3-carboxylic acid isopropyl ester, 5,7-dihydro-4- (2,3-dichloro-phenyl) -2-methyl-5-oxopyrrolo [3,4-b] pyridine-3-carboxylic acid isopropyl ester,

4- (3,4-dichlorophenyl) -2-methyl-5-oxo-5,6,7,8-tetrahydroquinoline-3-carboxylic acid methyl ester, 4- (3,4-dichlorophenyl) -2-methyl-5 -oxo-5,6,7,8-tetrahydroquinoline-3-carboxylic acid isopropyl ester,

4- (2,3-dichlorophenyl) -2-methyl-5-oxo-5,6,7,8-tetrahydroquinoline-3-carboxylic acid methyl ester, 4- (4-chlorophenyl) -2,7,7-trimethyl- 5-oxo-5,6,7,8-tetrahydroquinoline-3-carboxylic acid ethy 1 ester,

Methyl 4- (2,3-dichlorophenyl) -2,7,7-trimethyl-5-oxo-5,6,7,8-tetrahydroquinoline-3-carboxylic acid,

5,7-dihydro-4- (2,3-dichlorophenyl) -2-methyl-7-oxo-furo [3,4-b] pyridine-3-carboxylic acid isopropyl ester,

5,7-dihydro-4- (4-chlorophenyl) -2-methyl-7-oxo-furo [3,4-b] pyridine-3-carboxylic acid methyl ester,

5,7-Dihydro-4- (2,3-dichlorophenyl) -2-methyl-7-oxo-furo [3,4-b] pyridine-3-carboxylic acid, ethyl 1-ester, 5,7-dichloro-4 - (4-chlorophenyl) -2-methyl-7-oxo-furo [3,4-b] pyridine-3-carboxylic acid isopropyl 1 ester.

8. Medicament containing at least one 5-substituted pyridine and hexa- hydroquinoline-3-carboxylic acid derivative according to claim 7.

9. Medicament according to claim 8 for the treatment of cerebral disorders.

10. A process for the preparation of 5-substituted pyridine and hexahydroquinoline-3-carboxylic acid derivatives according to claim 8, characterized in that the corresponding dihydropyridines are oxidized.