2-Heteroaryl-imidazotriazinones and their use in the treatment of inflammatory or immune diseases

Abstract

The invention relates to 2-Heteroaryl-imidazotriazinones, processes for their preparation and their use in medicaments, esp. for the treatment and/or prophylaxis of inflammatory processes and/or immune diseases. The present invention relates to compounds of the general formula (I) in which R1 denotes 5- to 10-membered heteroaryl, which is optionally substituted by identical or different residues selected from the group consisting of halogen, (C1-C4)-alkyl, trifluoromthyl, cyano, nitro und trifluoromethoxy, denotes 3- to 10-membered carbocyclyl or carbon-bonded, 4- to 10-membered heterocyclyl, whereby carbocyclyl and heterocyclyl are optionally substituted by identical or different residues selected from the group consisting of (C1-C6)-aldyl, (C1-C6)-aldoxy, hydroxy, halogen, trifluoromethyl and oxo, or denotes (C2-C10)-alkyl, which is optionally substituted by identical or different residues selected from the group the group consisting of (C1-C6)-alkoxy, hydroxy, halogen, 3- to 10-membered carbocyclyl and oxo.

Description

The invention relates to 2-Heteroaryl-imidazotriazinones, processes for their preparation and their use in medicaments, esp. for the treatment and/or prophylaxis of inflammatory processes and/or immune diseases.

Phosphodiesterases (PDEs) are a family of enzymes responsible for the metabolism of the intracellular second messengers cAMP (cyclic adenosine monophosphate) and cGMP (cyclic guanosine monophosphate). PDE 4, as a cAMP specific PDE, catalyses the conversion of cAMP to AMP and is the major if not sole isoform of the phosphodiesterase enzymes present in inflammatory and immune cell types. Inhibition of this enzyme leads to the accumulation of cAMP which, in these cells, leads to the inhibition of a range of pro-inflammatory functions. Uncontrolled production of inflammatory mediators can lead to acute and chronic inflammation, tissue damage, multi-organ failures and to death. Additionally, elevation of phagocyte cAMP leads to inhibition of oxygen radical production. This cell function is more sensitive than others such as aggregation or enzyme release.

It is now recognised that both asthma and COPD (Chronic obstructive pulmonary disease) are chronic inflammatory lung diseases. In the case of asthma the eosinophil is the predominant infiltrating cell. Subsequent release of superoxide radicals as well as damaging cationic proteins from these infiltrating cells are believed to play a role in the progression of the disease and development of airway hyperreactivity.

By contrast, in COPD the neutrophil is the predominant inflammatory cell type found in the lungs of sufferers. The action of mediators and proteases released in the environment of the lung is believed to result in the irreversible airway obstruction seen in COPD. In particular the action of proteases in degrading the lung matrix results in fewer alveoli and is likely to be the major cause of accelerated long term lung function decline seen in this disease.

Treatment with a PDE 4 inhibitor is expected to reduce the inflammatory cell burden in the lung in both of these diseases [M. S. Barnette, “PDE 4 inhibitors in asthma and chronic obstructive pulmonary disease”, in: Progress in Drug Research, Birkhäuser Verlag, Basel, 1999, pp. 193-229; H. J. Dyke and J. G. Montana, “The therapeutic potential of PDE 4 inhibitors”, Exp. Opin. Invest. Drugs 8, 1301-1325 (1999)].

WO 99/24433 and WO 99/67244 describe 2-phenyl-imidazotriazinones as synthetic intermediates for the synthesis of 2-(aminosulfonyl-phenyl)-imidazotriazinones as inhibitors of cGMP-metabolizing phosphodiesterases.

U.S. Pat. No. 4,278,673 discloses 2-aryl-imidazotriazinones with cAMP phosphodiesterase inhibitory activity for the treatment of i.a. asthma.

The present invention relates to compounds of the general formula (I) in which

• R¹ denotes 5- to 10-membered heteroaryl, which is optionally substituted by identical or different residues selected from the group consisting of halogen, (C₁-C₄)-alkyl, trifluoromethyl, phenyl, cyano, nitro und trifluoromethoxy, and
• R² denotes 3- to 10-membered carbocyclyl or carbon-bonded, 4- to 10-membered heterocyclyl, whereby carbocyclyl and heterocyclyl are optionally substituted by identical or different residues selected from the group consisting of (C₁-C₆)-alkyl, (C₁-C₆)-alkoxy, hydroxy, halogen, trifluoromethyl and oxo, or
•  denotes (C₂-C₁₀)-alkyl, which is optionally substituted by identical or different residues selected from the group consisting of (C₁-C₆)-alkoxy, hydroxy, halogen, 3- to 10-membered carbocyclyl and oxo.

Another embodiment of the invention relates to compounds of the general formula (1), in which

• R¹ denotes furanyl, thiophenyl, thiazolyl, pyridyl, chinolyl or isochinolyl, which are optionally substituted by identical or different residues selected from the group consisting of halogen, (C₁-C₄)-alkyl, trifluoromethyl, cyano, nitro und trifluoromethoxy, and R² has the meaning indicated above.

Another embodiment of the invention relates to compounds of the general formula (I), in which R¹ has the meaning indicated above, and

• R² denotes (C₄-C₇)-cycloalkyl, which is optionally substituted up to two times by identical or different (C₁-C₅)-alkyl residues, or
•  denotes (C₃-C₈)-alkyl, which is optionally substituted by a (C₄-C₇)-cycloalkyl.

Preferred are compounds of the general formula (I), wherein R² denotes 4-tert-butyl-cyclohexyl.

Especially preferred are compounds of the general formula (I), wherein R² denotes cis-4-tert-butyl-cyclohexyl.

The compounds according to this invention can also be present in the form of their salts, hydrates and/or solvates.

In general, salts with organic or inorganic bases or acids may be mentioned here.

Physiologically acceptable salts are preferred in the context of the present invention.

Physiologically acceptable salts can also be salts of the compounds according to this invention with inorganic or organic acids. Preferred salts are those with inorganic acids such as, for example, hydrochloric acid, hydrobromic acid, phosphoric acid or sulphuric acid, or salts with organic carboxylic or sulphonic acids such as, for example, acetic acid, maleic acid, fumaric acid, malic acid, citric acid, tartaric acid, ethane-sulphonic acid, benzenesulphonic acid, toluenesulphonic acid or naphthalenedi-sulphonic acid. Preferred pyridinium salts are salts in combination with halogen.

The compounds according to this invention can exist in stereoisomeric forms which either behave as image and mirror image (enantiomers), or which do not behave as image and mirror image (diastereomers). The invention relates both to the enantiomers and to the racemates, as well as the pure diastereomer and mixtures thereof. The racemates, like the diastereomers, can be separated into the stereoisomerically uniform constituents according to known methods.

Hydrates of the compounds of the invention are stoichiometric compositions of the compounds with water, such as for example hemi-, mono-, or dihydrates.

Solvates of the compounds of the invention or their salts are stoichiometric compositions of the compounds with solvents.

(C₁-C₆)-Alkoxy in general represents a straight chain or branched alkoxy residue with 1 to 6 carbon atoms. The following alkoxy residues are mentioned by way of example: methoxy, ethoxy, n-propoxy, isopropoxy, tert.butoxy, n-pentoxy and n-hexoxy. Alkoxy residues with 1 to 4 carbon atoms are preferred. Alkoxy residues with 1 to 3 carbon atoms are especially preferred.

(C₂-C₁₀)-Alkyl, (C₁-C₈)-alkyl, (C₁-C₆)-alkyl and (C₁-C₄)-alkyl in general represent straight chain or branched alkyl residues with 2 to 10, 1 to 8, 1 to 6 or 1 to 4 carbon atoms, respectively. The alkyl residues can be saturated or partially unsaturated, i.e. contain one or more double and/or triple bonds. Saturated alkyl residues are preferred. The following alkyl residues are mentioned by way of example: methyl, ethyl, n-propyl, isopropyl, allyl, propargyl, tert.butyl, pentyl, hexyl, heptyl, octyl, nonyl, and decyl.

(C₆-C₁₀)-Aryl in general represents an aromatic residue with 6 to 10 carbon atoms. Phenyl and naphthyl are preferred.

3- to 10-membered carbocyclyl in general represents a mono- or polycyclic, carbocyclic residue with 3 to 10 ring atoms. 3- to 8-membered carbocyclyl is preferred. Mono- and bicyclic carbocyclyl residues are preferred. Especially preferred are monocyclic carbocyclyl residues. The carbocyclyl residues can be saturated or partially unsaturated. Saturated carbocyclyl residues are preferred. Especially preferred are (C₃-C₁₀)-cycloalkyl and (C₄-C₇)-cycloalkyl residues. The following carbocyclyl residues are mentioned by way of example: cyclopropyl, cyclobutyl, cyclopentyl, cyclopentenyl, cyclohexyl, cycloheptyl, norbom-1-yl, norbom-2-yl, norbom-7-yl, norbom-2-en-7-yl, cyclooctyl, cubyl, cyclononyl, cyclodecyl, decalinyl, adamant-1-yl, adamant-2-yl.

(C₃-C₁₀)-Cycloalkyl and (C₄-C₇)-cycloalkyl in general represent a cycloalkyl residue with 3 to 10 or 4 to 7 carbon atoms, respectively. The following cycloalkyl residues are mentioned by way of example: cyclopropyl, cyclobutyl, cyclopentyl, cyclopentenyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, or cyclodecyl.

Halogen in general represents fluoro, chloro, bromo and iodo. Fluoro, chloro, and bromo are preferred. Fluoro, and chloro are especially preferred.

5- to 10-membered heteroaryl in general represents a mono- or bicyclic, heteroaromatic residue with 5 to 10 ring atoms. Up to 4, preferably up to 2 ring atoms can be identical or different heteroatoms, preferably selected from N, O, and S. The following heteroaryl residues are mentioned by way of example: thienyl, furyl, pyrrolyl, imidazolyl, pyrazolyl, triazolyl, tetrazolyl, oxazolyl, thiazolyl, isothiazolyl, pyridyl, pyrimidyl, pyrazinyl, pyridazinyl, indolyl, quinolyl, isoquinolyl, quinazolyl, quinoxazolyl, benzothiazolyl, benzisothiazolyl, benzoxazolyl, isoxazolyl, benzimidazolyl, and oxazolinyl.

Carbon-bonded. 4- to 10-membered heterocyclyl in general represents a mono- or polycyclic, heterocyclic residue with 4 to 10 ring atoms, whereby the heterocycle is bound through a ring carbon ring atom. The heterocyclyl residue can contain up to 3, preferably 1, hetero ring atoms selected from nitrogen, oxygen, sulfur, —SO—, —SO₂—. Oxygen is preferred. Mono- and bicyclic heterocyclyl residues are preferred. Especially preferred are monocyclic heterocyclyl residues. The heterocyclyl residues can be saturated or partially unsaturated. Saturated heterocyclyl residues are preferred. The following heterocyclyl residues are mentioned by way of example: oxetan-3-yl, pyrrolidin-2-yl, pyrrolidin-3-yl, pyrrolinyl, tetrahydrofuranyl, tetrahydrothienyl, pyranyl, piperidinyl, thiopyranyl, morpholinyl, perhydroazepinyl.

Oxo in general represents a double-bonded oxygen atom.

Unless specified otherwise, when groups in compounds of the invention are optionally substituted, substitution by up to three identical or different residues is generally preferred.

The invention furthermore provides a process for preparing the compounds of the general formula (I) according to the invention, characterized in that compounds of the general formula (II) in which

• R² is as defined above and
• L represents straight-chain or branched alkyl having up to 4 carbon atoms, are condensed with compounds of the general formula (III) in which
• R¹ is as defined above, preferably using ethanol as a solvent, to the compounds of the general formula (IV), in which R¹ and R² are as defined above, which can optionally after isolation be reacted with a dehydrating agent, preferably phosphorus oxytrichloride, to yield the compounds of the general formula (I).

The compounds of the general formula (IV) can alternatively be prepared by

• [A] condensation of compounds of the general formula (IIa),
  • in which
  • L is as defined above,
  • with compounds of the general formula (III) to compounds of the general formula (IVa),
  • in which
  • R¹ is as defined above,
  • preferably using ethanol as a solvent,
• [B] followed by hydrolysis of the compounds of the general formula (IVa) to compounds of the general formula (V),
  • in which
  • R¹ is as defined above,
• [C] and finally by condensation of the compounds of the general formula (V) with compounds of the general formula (VI),
  • in which
  • R² is as defined above, and
  • T represents a leaving group, preferably chlorine.

The process according to the invention can be illustrated using the following scheme as an example:

Solvents which are suitable for the individual steps are the customary organic solvents which do not change under the reaction conditions. These preferably include ethers, such as diethyl ether, dioxane, tetrahydrofuran, glycol dimethyl ether, or hydrocarbons, such as benzene, toluene, xylene, hexane, cyclohexane or mineral oil fractions, or halogenated hydrocarbons, such as dichloromethane, trichloromethane, carbon tetrachloride, dichloroethane, trichloroethylene or chlorobenzene, or ethyl acetate, dimethylformamide, hexamethylphosphoric triamide, acetonitrile, acetone, dimethoxyethane or pyridine. It is also possible to use mixtures of the abovementioned solvents. Particular preference is given to ethanol for the reaction II/IIa+III→IV/IVa and dichloroethane for the cyclisation IV→I.

The reaction temperature can generally be varied within a relatively wide range. In general, the reaction is carried out in a range of from −20° C. to 200° C., preferably of from 0° C. to 100° C.

The process steps according to the invention are generally carried out under atmospheric pressure. However, it is also possible to operate under superatmospheric pressure or under reduced pressure (for example, in a range of from 0.5 to 5 bar).

The compounds of the general formula (IVa) are preferably hydrolysed to compounds of the general formula (V) under acidic conditions as for example in refluxing 2N hydrochloric acid.

The compounds of the general formula (V) are condensed with the compounds of the general formula (VI) to compounds of the general formula (IV) in inert solvents, if appropriate in the presence of a base.

Suitable inert solvents are the customary organic solvents which do not change under the reaction conditions. These preferably include ethers, such as diethyl ether, dioxane, tetrahydrofuran, glycol dimethyl ether, or hydrocarbons, such as benzene, toluene, xylene, hexane, cyclohexane or mineral oil fractions, or halogenated hydrocarbons, such as dichloromethane, trichloromethane, carbon tetrachloride, dichloroethylene, trichloroethylene or chlorobenzene, or ethyl acetate, dimethylformamide, hexamethylphosphoric triamide, acetonitrile, acetone, dimethoxyethane or pyridine. It is also possible to use mixtures of the abovementioned solvents.

Suitable bases are generally alkali metal hydrides or alkali metal alkoxides, such as, for example, sodium hydride or potassium tert-butoxide, or cyclic amines, such as, for example, piperidine, pyridine, dimethylaminopyridine or (C₁-C₄)-alkylamines, such as, for example, triethylamine. Preference is given to triethylamine, pyridine and/or dimethylaminopyridine.

The base is generally employed in an amount of from 1 mol to 4 mol, preferably from 1.2 mol to 3 mol, in each case based on 1 mol of the compound of the formula (V).

The reaction temperature can generally be varied within a relatively wide range. In general, the reaction is carried out in a range of from −20° C. to 200° C., preferably of from 0° C. to 100° C.

Some of the compounds of the general formula (II) are known, or they are novel, and they can then be prepared by

converting compounds of the general formula (VI) R²—CO-T  (VI) in which

• R² is as defined above and
• T represents halogen, preferably chlorine, initially by reaction with α-amino-butyric acid in inert solvents, if appropriate in the presence of a base and trimethylsilyl chloride, into the compounds of the general formula (VII), in which
• R² is as defined above, and finally reacting with the compound of the formula (VIII) in which
• L is as defined above, in inert solvents, if appropriate in the presence of a base.

The compounds of the general formula (IIa) can be prepared analogously.

Suitable solvents for the individual steps of the process are the customary organic solvents which do not change under the reaction conditions. These preferably include ethers, such as diethyl ether, dioxane, tetrahydrofuran, glycol dimethyl ether, or hydrocarbons, such as benzene, toluene, xylene, hexane, cyclohexane or mineral oil fractions, or halogenated hydrocarbons, such as dichloromethane, trichloromethane, carbon tetrachloride, dichloroethylene, trichloroethylene or chlorobenzene, or ethyl acetate, dimethylformamide, hexamethylphosphoric triamide, acetonitrile, acetone, dimethoxyethane or pyridine. It is also possible to use mixtures of the abovementioned solvents. Particular preference is given to dichloromethane for the first step and to a mixture of tetrahydrofuran and pyridine for the second step.

Suitable bases are generally alkali metal hydrides or alkali metal alkoxides, such as, for example, sodium hydride or potassium tert-butoxide, or cyclic amines, such as, for example, piperidine, pyridine, dimethylaminopyridine or (C₁-C₄)-alkylamines, such as, for example, triethylamine. Preference is given to triethylamine, pyridine and/or dimethylaminopyridine.

The base is generally employed in an amount of from 1 mol to 4 mol, preferably from 1.2 mol to 3 mol, in each case based on 1 mol of the compound of the formula (X).

The reaction temperature can generally be varied within a relatively wide range. In general, the reaction is carried out in a range of from −20° C. to 200° C., preferably of from 0° C. to 100° C.

The compounds of the general formulae (VI) and (VIII) are known per se, or they can be prepared by customary methods.

The compounds of the general formula (III) are known or can be prepared by

reacting compounds of the general formula (IX) R¹—Y  (IX) in which

• R¹ is as defined above, and
• Y represents a cyano, carboxyl, methoxycarbonyl or ethoxycarbonyl group, with ammonium chloride in toluene and in the presence of trimethylaluminium in hexane in a temperature range of from −20° C. to room temperature, preferably at 0° C. and atmospheric pressure, and reacting the resulting amidine, if appropriate in situ, with hydrazine hydrate.

The compounds of the general formula (IX) are known per se, or they can be prepared by customary methods.

The compounds of the general formula (I) inhibit the PDE 4 resident in the membranes of human neutrophils. One measured functional consequence of this inhibition was inhibition of superoxide anion production by stimulated human neutrophils.

The compounds of the general formula (I) can therefore be employed in medicaments for the treatment of inflammatory processes, esp. acute and chronic inflammatory processes, and/or immune diseases.

The compounds according to the invention are preferably suitable for the treatment and prevention of inflammatory processes, i.e. acute and chronic inflammatory processes, and/or immune diseases, such as emphysema, alveolitis, shock lung, all kinds of chronic obstructive pulmonary diseases (COPD), adult respiratory distress syndrome (ARDS), asthma, bronchitis, cystic fibrosis, eosinophilic granuloma, arteriosclerosis, arthrosis, inflammation of the gastro-intestinal tract, myocarditis, bone resorption diseases, reperfusion injury, Crohn's disease, ulcerative colitis, systemic lupus erythematosus, type I diabetes mellitus, psoriasis, anaphylactoid purpura nephritis, chronic glomerulonephritis, inflammatory bowel disease, atopic dermatitis, other benign and malignant proliferative skin diseases, allergic rhinitis, allergic conjunctivitis, vernal conjunctivitis, arterial restenosis, sepsis and septic shock, toxic shock syndrome, grafts vs. host reaction, allograft rejection, treatment of cytokine-mediated chronic tissue degeneration, rheumatoid arthritis, arthritis, rheumatoid spondylitis, osteoarthritis, coronary insufficiency, myalgias, multiple sclerosis, malaria, AIDS, cachexia, prevention of tumor growth and tissue invasion, leukemia, depression, memory impairment and acute stroke. The compounds according to the invention are additionally suitable for reducing the damage to infarct tissue after reoxygenation.

The compounds of formula (I) according to the invention can be used as active compound components for the production of medicaments. For this, they can be converted into the customary formulations such as tablets, coated tablets, aerosols, pills, granules, syrups, emulsions, suspensions and solutions in a known manner using inert, non-toxic, pharmaceutically suitable excipients or solvents. Preferably, the compounds according to the invention are used here in an amount such that their concentration in the total mixture is approximately 0.5 to approximately 90% by weight, the concentration, inter alia, being dependent on the corresponding indication of the medicament.

The above mentioned formulations are produced, for example, by extending the active compounds with solvents and/or excipients having the above properties, where, if appropriate, additionally emulsifiers or dispersants and, in the case of water as the solvent, alternatively an organic solvent, have to be added.

Administration is carried out in a customary manner, preferably orally, transdermally or parenterally, for example perlingually, buccally, intravenously, nasally, rectally or inhalationally.

For human use, in the case of oral administration, it is recommendable to administer doses of from 0.001 to 50 mg/kg, preferably of 0.01 mg/kg-20 mg/kg. In the case of parenteral administration, such as, for example, intravenously or via mucous membranes nasally, buccally or inhalationally, it is recommendable to use doses of 0.001 mg/kg-0.5 mg/kg.

In spite of this, if appropriate, it may be necessary to depart from the amounts mentioned above, namely depending on the body weight or the type of administration route, on the individual response towards the medicament, the manner of its formulation and the time or interval at which administration takes place. Thus, in some cases it may be sufficient to manage with less than the above mentioned minimum amount, while in other cases the upper limit mentioned must be exceeded. In the case of the administration of relatively large amounts, it may be recommendable to divide these into several individual doses over the course of the day.

Test Descriptions

• 1. Preparation of human PMN
  • Human PMN (polymorphonuclear neutrophil leucocytes) are readily purified from peripheral blood. Phosphodiesterase in these cells is predominantly located in the membrane fraction. Inhibitory potency of compounds against this preparation correlate well with the anti-inflammatory activity as measured by inhibiton of superoxide production.
  • Blood was taken from healthy subjects by venous puncture and neutrophils were purified by dextran sedimentation and density gradient centrifugation on Ficoll Histopaque and resuspended in the buffered medium.
• 2. Assay of Human PMN Phosphodiesterase
  • This was performed as a particulate fraction from human PMN essentially as described by Souness and Scott [Biochem. J. 291, 389-395 (1993)]. Particulate fractions were treated with sodium vanadate/glutathione as described by the authors to express the discrete stereospecific site on the phosphodiesterase enzyme. The prototypical PDE 4 inhibitor, rolipram, had an IC₅₀ value in the range 450 nM-1500 nM, thus defining this preparation as the so-called “low affinity” [L] form. The preparation examples had IC₅₀ values within the range of 0.1 nM-10,000 nM.
• 3. Inhibition of FMLP-stimulated production of superoxide radical anions
  • Neutrophils (2.5×10⁵ ml⁻¹) were mixed with cytochrome C (1.2 mg/ml) in the wells of a microtitre plate. Compounds according to the invention were added in dimethyl sulphoxide (DMSO). Compound concentration ranged from 2.5 nM to 10 μM, the DMSO concentration was 0.1% v/v in all wells. After addition of cytochalasin b (5 μg×ml⁻¹) the plate was incubated for 5 min at 37° C. Neutrophils were then stimulated by addition of 4×10⁻⁸ M FMLP N-Formyl-Met-Leu-Phe) and superoxide generation measured as superoxide dismutase inhibitable reduction of cytochrome C by monitoring the OD₅₅₀ in a Thermomax microtitre plate spectrophotometer. Initial rates were calculated using a Softmax kinetic calculation programme. Blank wells contained 200 units of superoxide dismutase.
  • The inhibition of superoxide production was calculated as follows: $\frac{\left[1-\left(\mathrm{Rx}-\mathrm{Rb}\right)\right]}{\left(\mathrm{Ro}-\mathrm{Rb}\right)}\times 100$
  • Rx=Rate of the well containing the compound according to the invention
  • Ro=Rate in the control well
  • Rb=Rate in the superoxide dismutase containing blank well
• 4. Assay of binding to the rolipram binding site (PDE 4 high affinity site; “H-PDE 4 form”) in rat brain membranes
  • The activity of compounds on the PDE 4 high affinity site (“H-PDE 4 form”) is readily measured by determining their potency for displacement of [³CH-ro-lipram from its binding site in rat brain membranes. Activity at this site is believed to be a measure of side effect potential (e.g. stimulation of stomach acid secretion, nausea and emesis).
  • The rolipram binding site assay was performed essentially as described by Schneider et al. [Eur. J. Pharmacol. 127, 105-115 (1986)].
• 5. Lipopolysaccharide (LPS)— induced neutrophil influx into rat lung
  • Intranasal administration of LPS to rats causes a marked influx of neutrophils into the lungs measurable by histological or biochemical (myeloperoxidase content of the cell pellet) analysis of the bronchoalveolar lavage fluid 24 h later. Rats were treated with test compound or vehicle administered by the oral route 1 h prior to and 6 h after administration of intranasal LPS. 24 hours later animals were euthanatized and their lungs lavaged with PBS (phosphate buffered saline). Neutrophil and total cell numbers were analysed.
• 6. Emetic potential in the marmoset
  • Vehicle or test compound was administered by the oral route to conscious marmosets. Animals were observed for emetic episodes or abnormal behaviour for 1 h post dosing. In some experiments, if no adverse response was seen, a separate group of animals was tested at ½ log dose higher until emesis or abnormal behaviour was observed. The highest dose at which no abnormal behavior or emetic episodes occurred was recorded as the NOEL.

Materials and Methods

LC-MS method A
LC-parameters	solution A acetonitrile
	solution B 0.3 g 30% HCl/l water
	column oven 50° C.;
	column Symmetry C18 2.1 × 150 mm
gradient:	time [min]	% A	% B	flow [ml/min]
	0	10	90	0.9
	3	90	10	1.2
	6	90	10	1.2
LC-MS method B
LC-parameters	solution A acetonitrile/0.1% formic acid
	solution B water/0.1% formic acid
	column oven 40° C.;
	column Symmetry C18 2.1 × 50 mm
gradient:	time [min]	% A	% B	flow [ml/min]
	0	10	90	0.5
	4	90	10	0.5
	6	90	10	0.5
	6.1	10	90	1.0
	7.5	10	90	0.5
GC-MS method A
Column:	HP-5 30 m × 320 μm × 0.25 μm
Carrier Gas:	Helium
Mode:	constant flow, initial flow: 1.5 ml/min
Oven ramp:	initial temp: 60° C.
	initial time: 1 min
	rate: 14° C./min up to 300° C., then 300° C. 2 min

Unless specified otherwise, the following chromatographic conditions were applied: chromatography was performed on silica gel Si 60; for flash chromatography, the usual conditions were followed as described in Still, J. Org. Chem. 43, 2923 (1978); mixtures of dichloromethane and methanol or cyclohexane and ethylacetate were used as eluants. Unless specified otherwise, reactions were executed under an argon atmosphere and under anhydrous conditions.

Abbreviations

HPLC=high performance liquid chromatography

MS=mass spectroscopy

NMR=nuclear magnetic resonance spectroscopy

LC-MS=liquid chromatography combined with mass spectroscopy

GC-MS gas chromatography combined with mass spectroscopy

MeOH=methanol

DMSO=dimethylsulfoxide

Starting Materials

EXAMPLE 1A

2-(Acetylamino)butanoic acid

163 g (1.58 mol) 2-Aminobutanoic acid are dissolved in acetic acid, and 242 g (2.37 mol) acetic anhydride are added dropwise. The mixture is stirred for 2 h at 100° C. until completion of reaction, then the solution evaporated to dryness in vacuo. The solid residue is suspended in ethyl acetate, filtered and washed with diethyl ether.

Yield: 220 g (96%)

¹H-NMR (Methanol-d₄): δ=0,97 (t, 3H), 1,65-1,93 (m, 2H), 1,99 (s, 3H), 4,29 (q, 1H) ppm.

EXAMPLE 2A

Ethyl 3-(acetylamino)-2-oxopentanoate

9.2 g (63.4 mmol) 2-(Acetylamino)butanoic acid are suspended in 120 ml tetrahydrofurane and heated to reflux together with 15.0 g (190 mmol) pyridine and a bit of N,N-dimethylaminopyridine. While heating at reflux, 17.3 g (127 mmol) ethyl chloro(oxo)acetate are added dropwise. The reaction mixture is heated at reflux until no more evolution of gas can be observed. After cooling down to room temperature, the reaction mixture is added to ice water and the organic phase extracted with ethyl acetate. The dried organic phase is evaporated to dryness in vacuo, dissolved in ethanol and the solution directly used for the next reaction.

EXAMPLE 3A

2-[(Cyclopentylcarbonyl)amino]butanoic acid

35 g (339 mmol) 2-aminobutanoic acid and 75,6 g (747 mmol) triethylamine are suspended in 300 ml of dichloromethane and stirred at 0° C. 81 g (747 mmol) chlorotrimethylsilane are added dropwise, then the mixture is stirred for 1 hour at room temperature and 1 hour at 40° C. After cooling down at −10° C., 45 g (339 mmol) cyclopentanecarbonyl chloride are added slowly. The reaction mixture is stirred for 2 hours at −10° C. and then 1 hour at room temperature. At 0° C., 50 ml of water are added. The mixture is diluted with water and dichloromethane, filtered and the solid product washed with water/dichloromethane 9/1, toluene and diethylether.

Yield: 52.4 g (77%)

¹H-NMR (DMSO-d₆, 300 MHz): δ=0,9 (t, 3H), 1,6 (m, 10H), 2,6 (m, 1H), 4,1 (m, 2H), 7,9 (d, 1H), 12,4 (s, 1H) ppm.

EXAMPLE 4A

Ethyl 3-[(cyclopentylcarbonyl)amino]-2-oxopentanoate

1,6 g (8 mmol) 2-[(Cyclopentylcarbonyl)amino]butanoic acid are suspended in 30 ml tetrahydrofurane and heated to reflux together with 1,91 g (24 mmol) pyridine and a bit of N,N-dimethylaminopyridine. While heating at reflux, 2,19 g (16 mmol) ethyl chloro(oxo)acetate are added dropwise. The reaction mixture is heated at reflux until no more evolution of gas can be observed. After cooling down to room temperature, the reaction mixture is added to ice water and the organic phase extracted with ethyl acetate. The dried organic phase is evaporated to dryness in vacuo, dissolved in ethanol and the solution directly used for the next reaction.

EXAMPLE 5A

3-Thiophenecarboximidamide hydrochloride

5,91 g (91,6 mmol, 2 equiv.) ammonium chloride are suspended in 40 ml of dry toluene under an argon atmosphere, and the mixture is cooled to 0° C. 45,8 ml (91,6 mmol, 2 equiv.) of a 2M solution of trimethylaluminium in hexane are added dropwise, and the reaction mixture is stirred at room temperature until no more evolution of gas is observed. After addition of 5,0 g (45,8 mmol) thiophene-3-carbonitrile, the mixture is stirred at 80° C. bath temperature over night. It is then cooled down to 0° C. and 50 ml of methanol are added with consequent stirring of 1 hour at room temperature. After filtration, the solid is washed with methanol for several times, the solution is evaporated to dryness in vacuo and the residue washed with methanol.

Yield: 6.7 g (90%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=7,7 (m, 1H), 7,8 (m, 1H), 8,7 (m, 1H), 9,0 (br.s, 2H), 9,4 (br.s, 2H) ppm.

EXAMPLE 6A

2-Quinolinecarboximidamide hydrochloride

In analogy to the procedure for Example 5A, 10,0 g (64,9 mmol) 2-quinolinecarbonitrile and proportionate amounts of the other reagents are used.

Yield: 9.2 g (68%)

¹H-NMR (200 MHz, DMSO): δ=7,83 (t, 1H), 7,97 (t, 1H), 8,19 (t, 2H), 8,37 (d, 1H), 8,77 (d, 1H) ppm.

EXAMPLE 7A

N-{1-[5-Oxo-3-(3-thienyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide

6,5 g (8,6 mmol, 1 equiv.) (40 mmol) of Example 5A are suspended in 150 ml of ethanol and 6,92 g (48 mmol, 1,2 equiv.) hydrazine hydrate are added. After stirring at room temperature for 1 hour, 11,95 g (60 mmol, 1,5 equiv) of the compound of Example 2A, dissolved in 30 ml of ethanol, are added. The reaction mixture is stirred at 80° C. (bath temperature) for 4 hours and then at room temperature over night. The mixture is evaporated to dryness in vacuo and the product is purified by chromatography (flash or column chromatography or preparative HPLC).

Yield: 4.9 g (44%)

¹H-NMR (DMSO-d₆, 300 MHz): δ=0,9 (t, 3H), 1,6 (m, 1H), 1,8 (m, 1H), 1,9 (s, 3H), 4,9 (m, 1H), 7,7 (m, 2H), 8,1 (m, 1H), 8,5 (m, 1H), 14,0 (br.s, 1H) ppm.

EXAMPLE 8A

N-{1-[5-Oxo-3-(2-phenyl-1,3-thiazol-4-yl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide

In analogy to the procedure for Example 7A, 1,0 g (4,2 mmol) 2-phenyl-1,3-thiazole-4-carboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 655 mg (44%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=0,9 (t, 3H), 1,6 (m, 1H), 1,8 (m, 1H), 1,9 (s, 3H), 4,9 (m, 1H), 7,6 (m, 3H), 8,2 (m, 2H), 8,7 (s, 1H), 14,2 (br.s, 1H) ppm.

EXAMPLE 9A

N-{1-[5-Oxo-3-(2-quinolinyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide

In analogy to the procedure for Example 7A, 5,0 g (24,1 mmol) 2-quinolinecarboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 6.0 g (54%)

LC/MS (method A): retention time 2.05 min., m/z 324 [M+H]⁺

EXAMPLE 10A

N-{1-[5-Oxo-3-(2-thienyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide

In analogy to the procedure for Example 7A, 2,0 g (12,3 mmol) 2-thiophenecarboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 0.6 g (15%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=0,9 (t, 3H), 1,6 (m, 1H), 1,8 (m, 1H), 1,9 (s, 3H), 4,9 (m, 1H), 7,3 (m, 1H), 8,0-8,2 (m, 3H), 14,2 (br. s, 1H) ppm.

EXAMPLE 11A

6-(1-Aminopropyl)-3-(3-thienyl)-1,2,4-triazin-5(4H)-one

4,9 g (17,6 mmol) Example 7A are heated to reflux in 50 ml 2 N hydrochloric acid for 3 hours. After cooling down to room teperature, the mixture is neutralized with 10% NaOH and, and, after addition of ethanol, evaporated to dryness in vacuo. The residue is treated with methanol and the filtrate separated from th salts. The filtrate is evaporated to dryness in vacuo and the crude product is directly used for the next step or the product is purified by chromatography (flash or column chromatography or preparative HPLC).

crude product:

LC/MS (B): MS (ES+): 237 (M+H⁺), retention time 0.38 min

EXAMPLE 12A

6-(1-Aminopropyl)-3-(2-phenyl-1,3-thiazol-4-yl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 631 mg (1,8 mmol) of Example 8A and proportionate amounts of the other reagents are used.

Yield: 373 mg (67%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=1,2 (t, 3H), 1,7 (m, 1H), 1,9 (m, 1H), 3,9 (d/d, 1H), 4,9 (br.s, 2H), 7,5 (m, 3H), 8,0 (m, 2H), 8,2 (s, 1H) ppm.

EXAMPLE 13A

6-(1-Aminopropyl)-3-(2-quinolinyl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 6,0 g (18,6 mmol) N-{1-[5-oxo-3-(2-quinolinyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide and proportionate amounts of the other reagents are used.

Yield: 3.1 g (42%)

MS (ESI+): 282 [M+H]⁺

EXAMPLE 14A

6-(1-Aminopropyl)-3-(2-thienyl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 9,40 g (33,8 mmol) of Example 10A and proportionate amounts of the other reagents are used.

Yield: 5.07 g (63%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=0,9 (t, 3H), 1,9 (m, 2H), 4,2 (bs, 1H), 4,3 (in, 1H), 7,1 (dd, 1H), 7,7 (m, 1H), 7,8 (m, 1H), 8,3 (br. s, 2H) ppm.

EXAMPLE 15A

N-{1-[5-Oxo-3-2-phenyl-1,3-thiazol-4-yl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-cyclopentanecarboxamide

170 mg (0,54 mmol, 1 equiv.) of Example 12A are suspended in 10 ml dichloromethane, 0,15 ml (1,08 mmol, 2 equiv.) triethylamine and 0,066 ml (0,54 mmol, 1 equiv.) cyclopentanecarbonyl chloride are added. The reaction mixture is stirred at room temperature until completion of reaction (1-2 hours). The reaction mixture is added to the same volume of 1N hydrochloric acid, the organic phase is washed with 1N hydrochloric acid and brine, dried over sodium sulfate and evaporated to dryness. The product is used without further purification or purified by chromatography (flash or column chromatography or preparative HPLC).

Yield: 182 mg (82%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=1,2 (t, 3H), 1,6-1,9 (m, 10H), 2,6 (m, 1H), 4,9 (m, 1H), 7,6 (m, 3H), 8,0 (d, 1H), 8,2 (m, 2H), 8,7 (s, 1H), 14,2 (br. s, 1H) ppm.

EXAMPLE 16A

N-{1-[5-Oxo-3-(2-phenyl-1,3-thiazol-4-yl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-cyclobutanecarboxamide

In analogy to the procedure for Example 15A, 188 mg (0,6 mmol) of Example 12A, 0,068 ml (0,6 mmol) cyclobutanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 218 mg (92%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=1,2 (t, 3H), 1,6-2,1 (m, 8H), 3,1 (m, 1H), 4,9 (m, 1H), 7,6 (m, 3H), 7,9 (d, 1H), 8,2 (m, 2H), 8,7 (s, 1H), 14,2 (br. S(1H) ppm.

EXAMPLE 17A

N-{1-[5-Oxo-3-(3-thienyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclopentanecarboxamide

In analogy to the procedure for Example 15A, 400 mg (1,69 mmol) of Example 11A, 0,206 ml (1,69 mmol) cyclopentanecarbonyl chloride and proportionate amounts of the other reagents are used.

LCIMS (B): MS (ES+): 333 (M+H⁺), retention time 3.05 min.

EXAMPLE 18A

N-{1-[5-Oxo-3-(3-thienyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclobutanecarboxamide

In analogy to the procedure for Example 15A, 400 mg (1,69 mmol) of Example 11A, 0,193 ml (1,69 mmol) cyclobutanecarbonyl chloride and proportionate amounts of the other reagents are used.

LC/MS (B): MS (ES+): 319 (M+H⁺), retention time 2.82 min.

EXAMPLE 19A

4-tert-Butyl-N-{1-[5-oxo-3-(3-thienyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclohexanecarboxamide

In analogy to the procedure for Example 1SA, 400 mg (1,69 mmol) of Example 11A, 343 mg (1,69 mmol) 4-tert-butylcyclohexanecarbonyl chloride and proportionate amounts of the other reagents are used.

LC/MS (B): MS (ES+): 403 (M+H⁺), retention time 4.16 min.

EXAMPLE 20A

N-{1-[5-Oxo-3-(2-quinolinyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclopentanecarboxamide

In analogy to the procedure for Example 15A, 500 mg (1,78 mmol) 6-(1-aminopropyl)-3-(2-quinolinyl)-1,2,4-triazin-5(4H)-one, 350 mg (2,67 mmol) cyclopentanecarbonyl chloride and proportionate amounts of the other reagents are used. The crude product is used in the next step without further purification.

Yield: 275 mg (41%) crude product.

EXAMPLE 21A

N-{1-[5-Oxo-3-(4-pyridinyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclopentane-carboxamide

560 mg (3,56 mmol, 1 equiv.) 4-pyridinecarboximidamide hydrochloride are suspended in 10 ml of ethanol and 220 mg (4,27 mmol, 1,2 equiv.) hydrazine hydrate are added. After stirring at room temperature for 1 hour, 1,0 g (3,92 mmol, 1,1 equiv) of the compound of Example 4A, dissolved in 10 ml of ethanol, are added. The reaction mixture is stirred at 70° C. (bath temperature) for 4 hours. The mixture is evaporated to dryness in vacuo and the product is purified by chromatography (flash or column chromatography or preparative HPLC).

Yield: 400 mg (34%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=0,9 (t, 3H), 1,4-1,9 (m, 10H), 2,7 (m, 1H), 4,9 (m, 1H), 8,0 (m, 3H), 8,8 (d, 2H), 14,3 (br. s, 1H) ppm.

EXAMPLE 22A

N-{1-[3-(4,6-Dimethyl-2-pyridinyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-cyclopentanecarboxamide

In analogy to the procedure for Example 21A, 1,28 g (6,9 mmol) 4,6-dimethyl-2-pyridinecarboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 2.25 g (crude)

LC/MS (A): MS (ESI): 356 (M+H⁺), retention time 3.48 min.

EXAMPLE 23A

N-({-[5-Oxo-3-(3-pyridinyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclopentanecarboxamide

In analogy to the procedure for Example 21A, 1,28 g (6,9 mmol) 3-pyridinecarboximidamide hydrochloride hydrochloride and proportionate amounts of the other reagents are used.

Yield: 1.4 g (32%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=0,9 (t, 3H), 1,4-1,9 (m, 10H), 2,7 (m, 1H), 4,9 (m, 1H), 7,6 (m, 1H), 8,0 (d, 1H), 8,4 (m, 1H), 8,8 (m, 1H), 9,2 (m, 1H), 14,2 (br. s, 1H) ppm.

EXAMPLE 24A

N-{1-[5-Oxo-3-(2-thienyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclopentanecarboxamide

In analogy to the procedure for Example 21A, 6,0 g (36,9 mmol) 2-thiophenecarboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 0.5 g (4%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=0,9 (t, 3H), 1,4-1,9 (m, 10H), 2,7 (m, 1H), 4,9 (m, 1H), 7,3 (m, 1H), 8,0 (m, 2H), 8,1 (m, 1H), 14,2 (br. s, 1H) ppm.

EXAMPLE 25A

N-{1-[5-Oxo-3-(2-pyridinyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclopentanecarboxamide

In analogy to the procedure for Example 21A, 2,8 g (17,8 mmol) 2-pyridinecarboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 0.98 g (17%)

LC/MS (A): MS (ESI): 328 (M+H⁺), retention time 3.02 min

EXAMPLE 26A

N-{1-[5-Oxo-3-(2-furanyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclopentanecarboxamide

In analogy to the procedure for Example 21A, 1,3 g (8,9 mmol) 2-furancarboximidamide hydrochloride hydrochloride and proportionate amounts of the other reagents are used.

Yield: 380 mg (13%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=0,9 (t, 3H), 1,4-1,9 (m, 10H), 2,7 (m, 1H), 4,9 (m, 1H), 6,8 (m, 1H), 7,4 (d, 1H), 8,0 (m, 1H), 8,1 (m, 1H), 14,1 (br. s, 1H) ppm.

EXAMPLE 27A

cis-4-tert-Butyl-N-{1-[5-oxo-3-(2-thienyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-cyclohexanecarboxamide

In analogy to the procedure for Example 15A, 1,00 g (4,23 mmol) of Example 14A, 0,94 g (4,65 mmol) cis-4-tert-butylcyclohexanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 1.6 g (94%)

LC/MS (A): MS (ESI): 403 (M+H⁺), retention time 4.25 min

EXAMPLE 28A

N-{1-[5-Oxo-3-(2-thienyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclobutanecarboxamide

In analogy to the procedure for Example 15A, 103 mg (0,434 mmol) of Example 14A, 57 mg (0,478 mmol) cyclobutanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 140 mg (100%)

EXAMPLE 29A

4-tert-Butyl-N-{1-[5-oxo-3-(2-thienyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclohexanecarboxamide

In analogy to the procedure for Example 15A, 350 mg (1,48 mmol) of Example 14A, 330 mg (1,63 mmol) 4-tert-butylcyclohexanecarbonyl chloride and proportionate amounts of the other reagents are used. A mixture of isomers is obtained.

Yield: 0.58 g (97%)

LC/MS (A): MS (ESI): 403 (M+H⁺), retention time 4.25 min

EXAMPLE 30A

3-Methyl-N-{1-[5-oxo-3-(2-thienyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}butane-amide

In analogy to the procedure for Example 15A, 85 mg (0,36 mmol) of Example 14A, 48 mg (0,40 mmol) 3-methylbutanoyl chloride and proportionate amounts of the other reagents are used.

Yield: 115 mg (crude)

LC/MS (A): MS (ESI): 321 (M+H⁺), retention time 2.91 min

EXAMPLE 31A

5-Chloro-2-thiophenecarboximidamide hydrochloride

In analogy to the procedure for Example 5A, 12,5 g (66 mmol) ethyl 5-chloro-2-thiophenecarboxylate and proportionate amounts of the other reagents are used.

Yield: 9.3 g (72%)

EXAMPLE 32A

1-Isoquinolinecarboximidamide hydrochloride

In analogy to the procedure for Example 5A, 10,0 g (64,9 mmol) 2-quinolinecarbonitrile and proportionate amounts of the other reagents are used.

Yield: 3.8 g (88%)

¹H-NMR (400 MHz, CD₃OD): δ=7,75 (t, 1H), 7,81 (t, 1H), 7,97-8,03 (m, 2H), 8,11 (d, 1H), 8,53 (d, 1H) ppm.

EXAMPLE 33A

3-Bromo-2-thiophenecarboximidamide hydrochloride

In analogy to the procedure for Example 5A, 15,0 g (79,8 mmol) 3-bromo-2-thiophenecarbonitrile and proportionate amounts of the other reagents are used.

Yield: 6.8 g (35%)

EXAMPLE 34A

1,5-Dimethyl-1H-pyrrole-2-carboximidamide hydrochloride

In analogy to the procedure for Example 5A, 5.0 g (41.6 mmol) 1,5-dimethyl-1H-pyrrole-2-carbonitrile and proportionate amounts of the other reagents are used.

Yield: 5.85 g (81%)

¹H-NMR (200 MHz, DMSO): δ=2.3 (s, 3H), 3.6 (s, 3H), 6.1 (m, 1H), 6.7 (m, 1H), 8.7 (br.m, 3H) ppm.

EXAMPLE 35A

3-Chloro-2-pyridinecarboximidamide hydrochloride

In analogy to the procedure for Example 5A, 7.8 g (56.3 mmol) 3-chloro-2-pyridinecarbonitrile and proportionate amounts of the other reagents are used.

Yield: 9.7 g (90%)

¹H-NMR (300 MHz, DMSO): δ=7.7 (d/d, 1H), 8.2 (d/d, 1H), 8.6 (br.m, 4H, 8.7 (d/d, 1H) ppm.

EXAMPLE 36A

1H-Pyrrole-2-carboximidamide hydrochloride

In analogy to the procedure for Example 5A, 4.9 g (53.2 mmol) 1H-pyrrole-2-carbonitrile and proportionate amounts of the other reagents are used.

Yield: 2.2 g (27%)

LC/MS (A): MS (ES+): 110 (M⁺+H), retention time 0.45 min

EXAMPLE 37A

3-Furancarboximidamide hydrochloride

In analogy to the procedure for Example 5A, 10.0 g (71.4 mmol) ethyl 3-furoate and proportionate amounts of the other reagents are used.

Yield: 8.76 g (84%)

LC/MS (A): MS (ES+): 111 (M⁺+H), retention time 0.40 min

EXAMPLE 38A

1-Methyl-1H-pyrrole-2-carboximidamide hydrochloride

In analogy to the procedure for Example 5A, 10.0 g (79.9 mmol) 1-methyl-1H-pyrrole-2-carboxylic acid and proportionate amounts of the other reagents are used.

Yield: 6.58 g (52%)

LC/MS (A): MS (ES+): 124 (M⁺+H), retention time 0.44 min

EXAMPLE 39A

N-{1-[3-(5-Chloro-2-thienyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide

In analogy to the procedure for Example 7A, 9,26 g (47,0 mmol) 5-chloro-2-thiophenecarboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 6.8 g (34%)

¹H-NMR (DMSO-d₆, 300 MHz): δ=0,91 (t, 3H), 1,52-1,90 (m, 5H, s bei 1,85), 4,87 (m, 1H), 7,34 (d, 1H), 7,94 (d, 1H), 8,09 (d, 1H, NH) ppm.

EXAMPLE 40A

N-{1-[3-(1-Isoquinolinyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide

In analogy to the procedure for Example 7A, 3,7 g (17,8 mmol) 1-isoquinolinecarboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 1.88 g (33%)

LC/MS (method A): retention time 1.89 min., m/z 324 [M+H]⁺

EXAMPLE 41A

N-{1-[3-(3-Bromo-2-thienyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide

In analogy to the procedure for Example 7A, 7,5 g (31,1 mmol) 3-bromo-2-thiophenecarboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 2.34 g (21%)

¹H-NMR (CD₃OD, 500 MHz): δ=0,93 (t, 3H), 1,58-1,96 (m, 5H, s bei 1,92), 4,97 (m, 1H), 7,16 (d, 1H), 7,79 (d, 1H) ppm.

EXAMPLE 42A

N-{1-[5-Oxo-3-(2-pyrazinyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide

In analogy to the procedure for Example 7A, 3,0 g (18,9 mmol) 1,4-pyrazine-2-carboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 1.88 g (36%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=0.9 (t, 3H), 1.6 (m, 1H), 1.8 (m, 1H), 1.9 (s, 3H), 4,9 (m, 1H), 8.2 (d, 1H), 8.7 (m, 1H), 8.9 (m, 1H), 9.4 (m, 1H) ppm.

EXAMPLE 43A

N-{1-[3-(2-Methyl-1,3-thiazol-4-yl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-acetamide

In analogy to the procedure for Example 7A, 4.5 g (25.3 mmol) 2-methyl-1,3-thiazole-4-carboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 3.38 g (46%)

LC/MS (A): MS (ES+): 294 (M+H⁺), retention time 1.51 min

EXAMPLE 44A

N-{1-[5-Oxo-3-(1,3-thiazol-2-yl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide

In analogy to the procedure for Example 7A, 4.95 g (30.25 mmol) 1,3-thiazole-2-carboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 3.61 g (43%)

¹H-NMR (DMSO-d₆, 400 MHz): δ=0.9 (t, 3H), 1.6 (m, 1H), 1.8 (m, 1H), 1.9 (s, 3H), 4,9 (m, 1H), 8.2 (m, 2H), 14.6 (br.s, 1H) ppm.

EXAMPLE 45A

N-{1-[3-(3,5-Difluoro-2-pyridinyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-acetamide

In analogy to the procedure for Example 7A, 5.00 g (25.8 mmol) 3,5-difluoro-2-pyridinecarboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 2.19 g (27%)

¹H-NMR (DMSO-d₆, 300 MHz): δ=0.9 (t, 3H), 1.6 (m, 1H), 1.8 (m, 1H), 1.9 (s, 3H), 4,9 (m, 1H), 8.1 (m, 1H), 8.2 (m, 1H), 8.7 (m, 1H), 14.1 (br.s, 1H) ppm.

EXAMPLE 46A

N-{1-[3-(1,5-Dimethyl-1H-pyrrol-2-yl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-acetamide

In analogy to the procedure for Example 7A, 5.80 g (33.4 mmol) of Example 34A and proportionate amounts of the other reagents are used.

Yield: 1.61 g (42%)

LC/MS (B): MS (ES+): 290 (M+H⁺), retention time 2.54 min

EXAMPLE 47A

N-{1-[3-(3-Bromo-2-pyridinyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-acetamide

In analogy to the procedure for Example 7A, 2.59 g (10.95 mmol) 3-bromo-2-pyridinecarboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 2.19 g (27%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=0.9 (t, 3H), 1.6 (m, 1H), 1.8 (m, 1H), 1.9 (s, 3H), 4,9 (m, 1H), 7.6 (m, 1H), 8.2 (br. d, 1H), 8.4 (m, 1H), 8.7 (m, 1H), 14.3 (br.s, 1H) ppm.

EXAMPLE 48A

N-{1-[3-(3-Chloro-2-pyridinyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-acetamide

In analogy to the procedure for Example 7A, 6.00 g (31.24 mmol) of Example 35A and proportionate amounts of the other reagents are used.

Yield: 3.40 g (35%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=0.9 (t, 3H), 1.6 (m, 1H), 1.8 (m, 1H), 1.9 (s, 3H), 4,9 (br. m, 1H), 7.7 (d/d, 1H), 8.2 (d/d, 1H), 8.7 (d/d, 1H), 14.3 (br.s, 1H) ppm.

EXAMPLE 49A

N-{1-[5-Oxo-3-(1H-pyrrol-2-yl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide

In analogy to the procedure for Example 7A, 6.15 g (42.24 mmol) of Example 36A and proportionate amounts of the other reagents are used.

Yield: 3.98 g (36%)

LC/MS (A): MS (ES+): 262 (M+H⁺), retention time 1.61 min

EXAMPLE 50A

N-{1-[3-(3-Furyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide

In analogy to the procedure for Example 7A, 8.76 g (59.8 mmol) of Example 37A and proportionate amounts of the other reagents are used.

Yield: 4.26 g (27%)

LC/MS (A): MS (ES+): 263 (M+H⁺), retention time 1.55 min

EXAMPLE 51A

N-{1-[3-(1-Methyl-1H-pyrrol-2-yl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-acetamide

In analogy to the procedure for Example 7A, 6.58 g (41.22 mmol) of Example 38A and proportionate amounts of the other reagents are used.

Yield: 2.88 g (25%)

LC/MS (A): MS (ES+): 276 (M+H⁺), retention time 1.73 min

EXAMPLE 52A

N-{-[5-Oxo-3-(3-pyridinyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide

In analogy to the procedure for Example 7A, 15,0 g (0,1 mol) 3-pyridincarboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 13.1 g (50%)

¹H-NMR (d₆-DMSO, 200 MHz): δ=0.9 (t, 3H), 1.6 (m, 21), 1.8 (m, 4H); 4.9 (m, 1H); 7.6 (m, 1H); 8.2 (m, 1H); 8.4 (m, 1H), 8.8 (m, 1H), 9.2 (m, 1H), 14.5 (bs, 1H) ppm.

EXAMPLE 53A

N-{1-[5-Oxo-3-(2-pyridinyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide

In analogy to the procedure for Example 7A, 6,0 g (38,1 mmol) 2-pyridin-carboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 5.6 g (54%)

¹H-NMR (d₆-DMSO, 200 MHz): δ=0.9 (t, 3H), 1.7 (m, 2H), 1.9 (s, 3H); 4.9 (m, 1H); 7.5 (bs); 7.7 (m, 1H); 8.2 (m, 2H), 8.8 (m, 1H) ppm.

EXAMPLE 54A

N-{1-[5-Oxo-3-(4-pyridinyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide

In analogy to the procedure for Example 7A, 10,0 g (63,5 mmol) 4-pyridin-carboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 10.5 g (61%)

¹H-NMR (d₆-DMSO, 200 MHz): δ=1,0 (t, 3H), 1.8 (m, 2H), 2.0 (s, 3H); 5.0 (m, 1H); 7.8 (m, 2H); 8.1 (m, 2H), 8.8 (m, 2H) ppm.

EXAMPLE 55A

N-{1-[3-(2,5-Dichloro-1,3-thiazol-4-yl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-acetamide

In analogy to the procedure for Example 7A, 5,0 g (21,5 mmol) 2,5-dichloro-1,3-thiazole-4-carboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 600 mg (8%)

¹H-NMR (d₆-DMSO, 300 MHz): δ=0,9 (t, 3H), 1.6 (m, 2H), 1.9 (s, 3H); 4.9 (m, 1H); 8.1 (m, 1H), 14.2 (bs, 1H) ppm.

EXAMPLE 56A

N-{1-[3-(2-Furyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide

In analogy to the procedure for Example 7A, 5,0 g (21,5 mmol) 2-furancarboximidamide hydrochloride and proportionate amounts of the other reagents are used.

Yield: 2.8 g (31%)

¹H-NMR (d₆-DMSO, 200 MHz): δ=0,9 (t, 3H), 1.6 (m, 1H), 1.8 (m, 1H), 1.9 (s, 3H); 4.9 (m, 1H); 6.8 (m, 1H); 7.5 (m, 1H), 8.1 (m, 2H); 14.1 (bs, 1H) ppm.

EXAMPLE 57A

6-(1-Aminopropyl)-3-(5-chloro-2-thienyl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 1,7 g (2,14 mmol) N-{1-[3-(5-chloro-2-thienyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide and proportionate amounts of the other reagents are used.

Yield: 0.35 g (61%)

¹H-NMR (CD₃OD, 400 MHz): δ=1,01 (t, 3H), 1,90-2,19 (m, 2H), 4,45 (t, 1H), 7,01 (d, 1H), 7,68 (d, 1H) ppm.

EXAMPLE 58A

6-(1-Aminopropyl)-3-(1-isoquinolinyl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 1,88 g (3,66 mmol) N-{1-[3-(1-isoquinolinyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide and proportionate amounts of the other reagents are used.

Yield: 0.5 g (48%)

¹H-NMR (CD₃OD, 400 MHz): δ=1,08 (t, 3H), 1,99-2,27 (m, 2H), 4,59 (t, 1H), 7,66 (t, 1H), 7,81 (t, 1H), 7,94 (d, 1H), 8,02 (d, 1H), 8,20 (d, 1H), 8,53 (d, 1H) ppm.

EXAMPLE 59A

6-(1-Aminopropyl)-3-(3-bromo-2-thienyl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 1A, 2,33 g (6,52 mmol) N-{1-[3-(3-bromo-2-thienyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}acetamide and proportionate amounts of the other reagents are used.

Yield: 1.04 g (51%)

¹H-NMR (CD₃OD, 400 MHz): δ=1,02 (t, 3H), 1,92-2,21 (m, 2H), 4,48 (t, 1H), 7,10 (d, 1H), 7,56 (d, 1H) ppm.

EXAMPLE 60A

6-(1-Aminopropyl)-3-(2-pyrazinyl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 1.88 g (6,9 mmol) of Example 42A and proportionate amounts of the other reagents are used.

Yield: 1.5 g (93%)

LC/MS (A): MS (ES+): 233 (M+H⁺), retention time 0.37 min

EXAMPLE 61A

6-(1-Aminopropyl)-3-(2-methyl-1,3-thiazol-4-yl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 3.35 g (11.42 mmol) of Example 43A and proportionate amounts of the other reagents are used.

Yield: 1.51 g (53%)

LC/MS (A): MS (ES+): 252 (M+H⁺), retention time 0.48 min

EXAMPLE 62A

6-(1-Aminopropyl)-3-(1,3-thiazol-2-yl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 3.60 g (12.9 mmol) of Example 44A and proportionate amounts of the other reagents are used.

Yield: 1.76 g (57%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=0.9 (t, 3H), 1.9 (m, 2H), 4,3 (t, 1H), 7.8 (d, 1H), 7.9 (d, 1H), 8.2 (br. m, 3H).

EXAMPLE 63A

6-(1-Aminopropyl)-3-(3,5-difluoro-2-pyridinyl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 2.15 g (6.9 mmol) of Example 45A and proportionate amounts of the other reagents are used.

Yield: 0.68 g (37%)

LC/MS (A): MS (ES+): 268 (M+H⁺), retention time 0.44 min

EXAMPLE 64A

6-(1-Aminopropyl)-3-(1,5-dimethyl-1H-pyrrol-2-yl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 3.67 g (12.7 mmol) of Example 46A and proportionate amounts of the other reagents are used.

Yield: 1.69 g (54%)

LC/MS (A): MS (ES+): 248 (M+H⁺), retention time 1.31 min

EXAMPLE 65A

6-(1-Aminopropyl)-3-(3-bromo-2-pyridinyl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 1.60 g (4.54 mmol) of Example 47A and proportionate amounts of the other reagents are used.

Yield: 0.48 g (34%)

¹H-NMR (DMSO-d₆, 300 MHz): δ=0.9 (t, 3H), 1.9 (m, 1H), 2.0 (m, 1H), 4,3 (t, 1H), 7.4 (m, 1H), 8.0 (br. s, 3H), 8.1 (m, 1H), 8.6 (m, 1H) ppm.

EXAMPLE 66A

6-(1-Aminopropyl)-3-(3-chloro-2-pyridinyl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 3.40 g (11.05 mmol) of Example 48A and proportionate amounts of the other reagents are used.

Yield: 1.24 g (42%)

¹H-NMR (DMSO-d₆, 300 MHz): δ=0.9 (t, 3H), 1.9 (m, 2H), 4,3 (t, 1H), 7.5 (d/d, 1H), 8.0 (d/d, 1H), 8.0 (br.s, 3H), 8.5 (d/d, 1H) ppm.

EXAMPLE 67A

6-(1-Aminopropyl)-3-(1H-pyrrol-2-yl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 3.98 g (15.23 mmol) of Example 49A and proportionate amounts of the other reagents are used.

Yield: 1.82 g (54%)

¹H-NMR (DMSO-d₆, 300 MHz): δ=0.9 (t, 3H), 1.9 (m, 1H), 2.0 (m, 1H), 4,2 (t, 1H), 6.2 (m, 1H, 6.9 (m, 2H), 8.4 (br. s, 3H), 11.6 (br. s, 1H) ppm.

EXAMPLE 68A

6-(1-Aminopropyl)-3-(3-furyl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 4.26 g (16.24 mmol) of Example 50A and proportionate amounts of the other reagents are used. The product is used for the next step without further purification.

LC/MS (B): MS (ES+): 221 (M+H⁺), retention time 0.35 min

EXAMPLE 69A

6-(1-Aminopropyl)-3-(1-methyl-1H-pyrrol-2-yl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 2.88 g (10.46 mmol) of Example 51A and proportionate amounts of the other reagents are used. The product is used for the next step without further purification.

LC/MS (B): MS (ES+): 234 (M+H⁺), retention time 0.40 min

EXAMPLE 70A

6-(1-Aminopropyl)-3-(3-pyridinyl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 3,40 g (10 mmol) of Example 52A and proportionate amounts of the other reagents are used. The compound is used without further purification.

LC/MS (A): MS (ESI): 232 (M+H⁺), retention time 0.37 min

¹H-NMR (d₆-DMSO, 200 MHz): δ=0,9 (t, 3H), 1.9 (m, 2H), 4.3 (m, 1H), 7.5 (br. s), 8.1-9.4 (m) ppm.

EXAMPLE 71A

6-(1-Aminopropyl)-3-(2-pyridinyl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 7,60 g (27,8 mmol) of Example 53A and proportionate amounts of the other reagents are used. The compound is used without further purification.

LC/MS (A): MS (ESI): 232 (M+H⁺), retention time 0.35 min

¹H-NMR (d₆-DMSO, 200 MHz): δ=0,9 (t, 3H), 1.9 (m, 2H), 4.3 (m, 1H), 7.8 (br. s), 8.0 (m, 1H), 8.3 (m, 1H), 8.8 (m, 1H) ppm.

EXAMPLE 72A

6-(1-Aminopropyl)-3-(4-pyridinyl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 4,50 g (16,5 mmol) of Example 54A and proportionate amounts of the other reagents are used.

Yield: 3.1 g (81%)

LC/MS (A): MS (ESI): 232 (M+H⁺), retention time 0.34 min

¹H-NMR (d₆-DMSO, 200 MHz): δ=0,9 (t, 3H), 1.9 (m, 2H), 4.3 (m, 1H), 7.5 (br. s), 8.1 (m, 2H), 8.7 (m, 2H) ppm.

EXAMPLE 73A

6-(1-Aminopropyl)-3-(2,5-dichloro-1,3-thiazol-4-yl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11A, 200 mg (0,57 mmol) of Example 55A and proportionate amounts of the other reagents are used.

Yield: 150 mg (85%)

LC/MS (B): MS (ESI): 306 (M+H⁺), retention time 0.35 min

EXAMPLE 74A

6-(1-Aminopropyl)-3-(2-furyl)-1,2,4-triazin-5(4H)-one

In analogy to the procedure for Example 11, 2,60 g (9,91 mmol) of Example 56A and proportionate amounts of the other reagents are used. The compound is used without further purification.

LC/MS (A): MS (ESI): 221 (M+H⁺), retention time 0.33 min

¹H-NMR (d₆-DMSO, 200 MHz): δ=0.8 (t, 3H), 1.7 (m, 2H), 3.7 (m, 1H), 6.5 (m, 1H), 6.9 (m, 1H), 7.7 (m, 1H) ppm.

EXAMPLE 75A

N-{1-[5-Oxo-3-(2-thienyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-3-(trifluoromethyl)cyclohexanecarboxamide

83 mg (0,42 mmol, 1 equiv.) 3-trifluoromethylcyclohexanecarboxylic acid are suspended in dichloromethane at 0° C. and 62 mg (0,456 mmol, 1,05 equiv.) 1-hydroxy-1H-benzotriazol and 87 mg (0,456 mmol, 1,05 equiv.)]-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride are consecutively added. After stirring at room temperature for 30 min, 100 mg (0,42 mmol) of Example 14A are added. The reaction mixture is stirred at room temperature for 2 hours. The mixture is diluted with dichloromethane, washed twice with 1N sulfuric acid and once with saturated sodium bicarbonate solution, dried over magnesium sulfate and evaporated to dryness in vacuo. The product is used without further purification.

Yield: 160 mg (91%)

LC/MS (B): MS (ESI): 415 (M+H⁺), retention time 3.63 min

EXAMPLE 76A

4-Methyl-N-{1-[5-oxo-3-(2-thienyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclohexanecarboxamide

In analogy to the procedure for Example 75A, 103 mg (0,43 mmol) of Example 14A, 62 mg (0,43 mmol) 4-methylcyclohexanecarboxylic acid and proportionate amounts of the other reagents are used.

Yield: 150 mg (95%)

LC/MS (B): MS (ESI): 361 (M+H⁺), retention time 3.59 min

EXAMPLE 77A

2-Cyclohexyl-N-{1-[5-oxo-3-(2-thienyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-acetamide

In analogy to the procedure for Example 15A, 100 mg (0,42 mmol) of Example 14A, 70 mg (0,47 mmol) cyclohexylacetyl chloride and proportionate amounts of the other reagents are used.

Yield: 150 mg (98%)

LC/MS (B): MS (ESI): 361 (M+H⁺), retention time 3.51 min

EXAMPLE 78A

1,4-Dimethyl-N-{1-[5-oxo-3-(2-thienyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclohexanecarboxamide

In analogy to the procedure for Example 15A, 100 mg (0,42 mmol) of Example 14A, 80 mg (0,47 mmol) 1,4-dimethylcyclohexanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 150 mg (94%)

LC/MS (B): MS (ESI): 375 (M+H⁺), retention time 3.88 min

EXAMPLE 79A

N-[1-(3-(2-Thienyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl)propyl]-1-adamantane-carboxamide

In analogy to the procedure for Example 15A, 100 mg (0,43 mmol) of Example 14A, 95 mg (0,48 mmol) 1-adamantanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 160 mg (92%)

LC/MS (B): MS (ESI): 399 (M+H⁺), retention time 3.90 min

EXAMPLE 80A

4-tert-Butyl-N-{1-[5-oxo-3-(3-pyridinyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-cyclohexanecarboxamide

In analogy to the procedure for Example 15A, 250 mg (1,08 mmol) of Example 70A, 240 mg (1,19 mmol) 4-tert-butylcyclohexanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 200 mg (47%)

LC/MS (B): MS (ESI): 398 (M+M), retention time 3.79 min

EXAMPLE 81A

4-cis-tert-Butyl-N-{1-[5-oxo-3-(2-pyridinyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-cyclohexanecarboxamide

In analogy to the procedure for Example 15A, 200 mg (0,86 mmol) of Example 71A, 190 mg (0,95 mmol) 4-cis-tert-butylcyclohexanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 300 mg (87%)

LC/MS (B): MS (ESI): 398 (M+H⁺), retention time 4.21 min

EXAMPLE 82A

4-cis-tert-Butyl-N-{1-[5-oxo-3-(4-pyridinyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-cyclohexanecarboxamide

In analogy to the procedure for Example 15A, 200 mg (0,86 mmol) of Example 72A, 190 mg (0,95 mmol) 4-cis-tert-butylcyclohexanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 300 mg (87%)

LC/MS (B): MS (ESI): 398 (M+H⁺), retention time 3.78 min

EXAMPLE 83A

4-tert-Butyl-N-{1-[3-(2,5-dichloro-1,3-thiazol-4-yl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclohexanecarboxamide

In analogy to the procedure for Example 15A, 150 mg (0,49 mmol) of Example 73A, 110 mg (0,54 mmol) 4-cis-tert-butylcyclohexanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 100 mg (43%)

MS (ESI): 473 (M+H⁺)

EXAMPLE 84A

4-tert-Butyl-N-{1-[3-(2-furyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-cyclohexanecarboxamide

In analogy to the procedure for Example 15A, 250 mg (1,14 mmol) of Example 74A, 250 mg (1,25 mmol) 4-cis-tert-butylcyclohexanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 300 mg (68%)

LC/MS (B): MS (ESI): 387 (M+H⁺), retention time 4.00 min

EXAMPLE 85A

cis-4-tert-Butylcyclohexanecarboxylic acid

A preparative HPLC separation of cis- and trans-4-tert-butylcyclohexanecarboxylic acid was carried out under the following conditions:

• Feed: 10 g isomeric mixture of cis- and trans-4-tert-butyl-cyclohexanecarboxylic acid dissolved in 500 ml iso-hexane (80%)/tert-butylmethylether (20%)
• Column: 330×100 mm; Self Packing Device NW 100; Merck
• Stationary phase: LiChrospher Si 60, 12 μm, Merck
• Mobile phase: iso-hexane/tert-butylmethylether (4/1 v/v)+0.25 vol-% acetic acid
• Flow: 150 ml/min
• Injection volume: 70 ml (=1.4 g compound)
• Wave length: 210 nm
• Temperature: 25° C.

The sample run on this column was repeatedly injected every 30 minutes. The cis-isomer is the first eluting compound.

cis-isomer:

mp: 118° C.

¹H-NMR (300 MHz, DMSO): δ=0.9 (t, 3H), 1.0 (m, 3H), 1.4 (m, 2H), 1.6 (m, 1H), 2.1 (m, 2H), 2.5 (m, 1H), 12.0 (s, 1H) ppm.

trans-isomer:

mp: 172° C.

¹H-NMR (300 MHz, DMSO): δ=0.9 (t, 3H), 1.0 (m, 3H), 1.3 (m, 2H), 1.7 (m, 1H), 1.9 (m, 2H), 2.1 (m, 1H), 11.9 (s, 1H) ppm.

EXAMPLE 86A

cis-4-tert-Butylcyclohexanecarbonyl chloride

2.0 g (10.85 mmol) cis-4-tert-Butylcyclohexanecarboxylic acid are dissolved in 50 ml dichloromethane, 1.65 g (13.02 mmol) ethanedioyl dichloride are added and the solution is stirred at room temperature for one hour. The mixture is then stirred at reflux for two hours and, after cooling down to room temperature, evaporated to dryness in vacuo. The residue is then dissolved in toluene two times and again evaporated to dryness in vacuo. The residue is used in the next step without further purification.

PREPARATION EXAMPLES

EXAMPLE 1

7-Cyclobutyl-5-ethyl-2-(2-phenyl-1,3-thiazol-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

202 mg (0,51 mmol, 1 equiv.) of Example 16A are suspended in 10 ml dichloroethane, and 117 mg (0,77 mmol, 1,5 equiv.) phosphoroxychloride are added. The mixture is stirred at reflux for 3 hours. After cooling down to room temperature, ethyl acetate and saturated NaHCO₃ (aq) are added. The organic phase is washed with saturated NaHCO₃ (aq), water and brine, dried over sodium sulfate and evaporated to dryness in vacuo. The product is purified by chromatography (flash or column chromatography or preparative HPLC).

Yield: 108 mg (56%)

¹H-NMR (DMSO-d₆, 300 MHz): δ=1,2 (t, 3H), 2,0 (m, 2H), 2,4 (m, 4H), 2,9 (q, 2H, 4,0 (m, 1H, 7,5 (m, 3H), 8,2 (m, 2H), 8,5 (s, 1H), 11,7 (s, 1H) ppm.

EXAMPLE 2

7-Cyclopentyl-5-ethyl-2-(2-phenyl-1,3-thiazol-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 155 mg (0,38 mmol) of Example 15A, 87 mg (0,57 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 80 mg (54%)

¹H-NMR (DMSO-d₆, 300 MHz): δ=1,2 (t, 3H), 1,7 (m, 2H), 1,8 (m, 4H), 2,1 (m, 2H), 2,9 (q, 2H), 3,6 (m, 1H), 7,5 (m, 3H), 8,2 (m, 2H), 8,5 (s, 1H), 11,7 (s, 1H) ppm.

EXAMPLE 3

7-Cyclopentyl-5-ethyl-2-(3-thienyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 550 mg (1,65 mmol) of Example 17A, 380 mg (2,48 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 80 mg (15%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=1,2 (t, 3H), 1,8 (m, 6H), 2,1 (m, 2H), 2,9 (q, 2H), 3,6 (m, 1H), 7,7 (m, 2H), 8,5 (m, 1H), 11,7 (s, 1H) ppm.

EXAMPLE 4

7-Cyclobutyl-5-ethyl-2-(3-thienyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 530 mg (1,66 mmol) of Example 18A, 383 mg (2,50 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 47 mg (9%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=1,2 (t, 3H), 1,8 (m, 1H), 2,1 (m, 1H), 2,4 (m, 4H), 2,9 (q, 2H), 4,0 (m, 1H), 7,7 (m, 2H), 8,5 (m, 1H), 11,8 (s, 1H) ppm.

EXAMPLE 5 AND EXAMPLE 6

7-(4-tert-Butylcyclohexyl)-5-ethyl-2-(3-thienyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 680 mg (1,69 mmol) of Example 19A, 389 mg (2,53 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used. The isomers are separated by chromatography.

Yield: 18 mg (3%) cis-isomer

90 mg (14%) trans-isomer

cis-isomer (Example 5):

¹H-NMR (DMSO-d₆, 300 MHz): δ=0,8 (s, 9H), 1,1 (m, 1H), 1,2 (t, 3H), 1,6 (m, 3H), 1,7 (m, 3H), 2,2 (m, 2H), 2,9 (m, 2H), 3,5 (m, 1H), 7,7 (m, 1H), 7,7 (m, 1H), 8,5 (m, 1H), 11,7 (s, 1H) ppm.

trans-isomer (Example 6):

¹H-NMR (DMSO-d₆, 300 MHz): δ=0,9 (s, 9H), 1,1 (m, 2H), 1,2 (t, 3H), 1,6 (m, 2H), 1,8 (m, 2H), 2,0 (m, 2H), 2,9 (m, 2H), 3,1 (m, 1H), 7,7 (m, 1H), 7,7 (m, 2H), 11,8 (s, 1H) ppm.

EXAMPLE 7

7-Cyclopentyl-5-ethyl-2-(2-quinolinyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 280 mg (0,73 mmol) N-{1-[5-oxo-3-(2-quinolinyl)-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclopentanecarboxamide, 560 mg (3,64 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 73 mg (28%)

¹H-NMR (400 MHz, CD₃OD): δ=1,22 (t, 3H), 1,57-2,19 (m, 8H), 2,92 (q, 2H), 3,69 (quint, 1H), 7,58-7,63 (t, 1H), 7,72-7,79 (t, 1H), 7,92 (d, 1H), 8,15 (d, 1H), 8,29 (d, 1H), 8,40 (d, 1H) ppm.

EXAMPLE 8

7-Cyclopentyl-5-ethyl-2-(4-pyridyl)imidazo[5,1-f]triazin-4(3H)-one

In analogy to the procedure for Example 1, 25 mg (0,37 mmol) of Example 21A, 56 mg (0,37 mmol) phosphoric trichloride are stirred at reflux for 2 hours, proportionate amounts of the solvents are used.

Yield: 125 mg (100%)

LC/MS (A): MS (ESI): 310 (M+H⁺), retention time 3.00 min.

EXAMPLE 9

7-Cyclopentyl-2-(4,6-dimethyl-2-pyridinyl)-5-ethylimidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 2,25 g (6,33 mmol) of Example 22A, 971 mg (6,33 mmol) phosphoric trichloride are stirred at reflux for 2 hours, proportionate amounts of the solvents are used.

Yield: 120 mg (6%)

LC/MS (A): MS (ESI): 337 (M+H⁺), retention time 4.30 min.

EXAMPLE 10

7-Cyclopentyl-5-ethyl-2-(3-pyridinyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 2, 25 g (6,33 mmol) of Example 23A, 971 mg (6,33 mmol) phosphoric trichloride are stirred at reflux for 2 hours, proportionate amounts of the solvents are used.

Yield: 120 mg (6%)

¹H-NMR (300 MHz, DMSO): δ=12.00 (br. s, 1H), 9.10 (d, J=2 Hz, 1H), 8.75 (m, 1H), 8.30 (m, 1H), 7.60 (dd, J=5 Hz, J=7 Hz, 1H), 3.60 (m, 1H), 2.90 (q, J=7 Hz, 2H), 2.20-1.60 (m, 8H), 1.25 (t, J=7 Hz, 3H) ppm.

EXAMPLE 11

7-Cyclopentyl-5-ethyl-2-(2-thienyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 500 mg (1,50 mmol) of Example 24A, 384 mg (1,50 mmol) phosphoric trichloride are stirred at reflux for 2 hours, proportionate amounts of the solvents are used.

Yield: 390 mg (82%)

¹H-NMR (300 MHz, DMSO): δ=12.10 (br. s, 1H), 8.10 (d, J=3 Hz, 1H), 7.85 (d, J=5 Hz, 1H), 7.20 (dd, J=3 Hz, J=5 Hz, 1H), 3.50 (m, 1H), 2.90 (q, J=7 Hz, 2H), 2.20-1.60 (m, 8H), 1.20 (t, J=7 Hz, 3H) ppm.

EXAMPLE 12

7-Cyclopentyl-5-ethyl-2-(2-pyridinyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 940 mg (2,87 mmol) of Example 25A, 440 mg (2,87 mmol) phosphoric trichloride are stirred at reflux for 4 hours, proportionate amounts of the solvents are used.

Yield: 440 mg (49%)

¹H-NMR (300 MHz, DMSO): δ=11.20 (br. s, 1H), 8.80 (d, J=2 Hz, 1H), 8.25 (d, J=7 Hz, 1H), 8.05 (m, 1H), 7.65 (m, 1H), 3.60 (m, 1H), 2.90 (q, J=7 Hz, 2H), 2.20-1.60 (m, 8H), 1.20 (t, J=7 Hz, 3H) ppm.

EXAMPLE 13

7-Cyclopentyl-5-ethyl-2-(2-furyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 380 mg (1,20 mmol) of Example 26A, 184 mg (1,20 mmol) phosphoric trichloride are stirred at reflux for 4 hours, proportionate amounts of the solvents are used.

Yield: 100 mg (28%)

¹H-NMR (300 MHz, DMSO): δ 12.00 (br. s, 1H), 8.00 (m, 1H), 7.55 (m, 1H), 6.75 (m, 1H), 3.50 (m, 1H), 2.85 (q, J=7 Hz, 2H), 2.20-1.60 (m, 8H), 1.20 (t, J=7 Hz, 3H) ppm.

EXAMPLE 14

7-(cis-4-tert-Butylcyclohexyl)-5-ethyl-2-(2-thienyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

1,6 g (3,98 mmol, 1 equiv.) of Example 27A are suspended in 28 ml dichloroethane, and 2,27 g (14,8 mmol, 4 equiv.) phosphoroxychloride are added. The mixture is stirred at reflux for 4 hours. After cooling down to room temperature, dichloromethane is added and the organic phase is quenched with water, washed with water, dried over magnesium sulfate and evaporated to dryness in vacuo. The solid residue is washed with diethyl ether, filtered and dried.

Yield: 0.67 g (45%)

¹H-NMR (300 MHz, DMSO): δ=0.83 (s, 9H); 1.01-1.13 (m, 1H); 1.18 (t, 3H); 1.49-1.75 (m, 6H); 2.20 (m, 2H), 2.88 (q, 2H); 3.47 (m, 1H); 7.20 (dd, 1H); 7.80 (dd, 1H); 8.08 (dd, 1H); 11.92 (s, 1H) ppm.

EXAMPLE 15

7-Cyclobutyl-5-ethyl-2-(2-thienyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 140 mg (0,44 mmol) of Example 28A, 165 mg (1,07 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 31 mg (23%)

¹H-NMR (300 MHz, DMSO): δ=1.24 (t, 3H); 1.88-2.52 (t, 6H); 2.88 (q, 2H); 3.93 (m, 1H); 7.22 (m, 1H); 7.84 (dd, 1H); 8.08 (dd, 1H); 12.01 (s, 1H) ppm.

EXAMPLE 16

7-(trans-4-tert-Butylcyclohexyl)-5-ethyl-2-(2-thienyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 580 mg (1,44 mmol) of Example 29A, 820 mg (5,36 mmol) phosphoric trichloride are stirred at reflux for 4 hours, proportionate amounts of the solvents are used.

Yield: 85 mg (15%)

¹H-NMR (300 MHz, DMSO): δ=0.89 (s, 9H); 1.12 (m, 2H); 1.22 (m, 4H); 1.62 (m, 2H); 1.87 (m, 2H); 2.03 (m, 2H); 2.87 (q, 2H); 2.86-3.07 (m, 1H); 7.21 (dd, 1H); 7.82 (dd, 1H); 8.08 (dd, 1H); 11.97 (s, 1H) ppm.

EXAMPLE 17

5-Ethyl-7-isobutyl-2-(2-thienyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 270 mg (0,84 mmol) of Example 30A, 235 mg (1.53 mmol) phosphoric trichloride are stirred at reflux for 4 hours, proportionate amounts of the solvents are used.

Yield: 4.5 mg (2%)

¹H-NMR (300 MHz, DMSO): δ=0.94 (d, 6H); 1.23 (t, 3H); 2.17 (m, 1H); 2.79-2.97 (m, 4H); 7.21 (dd, 1H); 7.82 (dd, 1H); 8.10 (dd, 1H); 12.00 (s, 1H) ppm.

EXAMPLE 18

2-(5-Chloro-2-thienyl)-7-cyclopentyl-5-ethylimidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 203 mg (0,55 mmol) crude N-{1-[3-(5-chloro-2-thienyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclopentanecarboxamide, 127 mg (0,83 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 67 mg (35%)

¹H-NMR (400 MHz, CD₃OD): δ=1,28 (t, 3H), 1,56-2,18 (m, 8H), 2,96 (q, 2H), 3,60 (quint, 1H), 7,09 (d, 1H), 7,72 (d, 1H) ppm.

EXAMPLE 19

cis-7-(4-tert-Butylcyclohexyl)-2-(5-chloro-2-thienyl)-5-ethylimidazo[5,1-f][1,2,4]-triazin-4(3H)-one

In analogy to the procedure for Example 1, 322 mg (0,74 mmol) crude cis-4-tert-butyl-N-{1-[3-(5-chloro-2-thienyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-cyclohexanecarboxamide, 169 mg (1,10 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 72 mg (23%)

¹H-NMR (400 MHz, CD₃OD): δ=0,85 (s, 9H), 0,96-2,40 (m, 12H, t at 1,27), 2,96 (q, 2H), 3,48 (m, 1H), 7,11 (d, 1H), 7,79 (d, 1H) ppm.

EXAMPLE 20

7-Cyclopentyl-5-ethyl-2-(1-isoquinolinyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 402 mg (1,07 mmol) crude N-{1-[3-(1-isoquinolinyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclopentanecarboxamide, 245 mg (1,60 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 115 mg (30%)

¹H-NMR (400 MHz, CD₃OD): δ=1,32 (t, 3H), 1,55-2,24 (m, 8H), 3,02 (q, 2H), 3,71 (quint, 1H), 7,79 (t, 1H), 7,86 (t, 1H), 8,02 (d, 1H), 8,07 (d, 1H), 8,66 (d, 1H), 9,15 (d, 1H) ppm.

EXAMPLE 21

cis-7-(4-tert-Butylcyclohexyl)-5-ethyl-2-(1-isoquinolinyl)imidazo[5, 1-f][1,2,4]-triazin-4(3H)-one

In analogy to the procedure for Example 1, 318 mg (0,71 mmol) crude cis-4-tert-butyl-N-{1-[3-(1-isoquinolinyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclohexanecarboxamide, 164 mg (1,07 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 111 mg (36%)

¹H-NMR (400 MHz, CD₃OD): δ=0,85 (s, 9H), 1,01-2,48 (m, 12H, t at 1,33), 3,04 (q, 2H), 3,65 (m, 1H), 7,78 (t, 1H), 7,85 (t, 1H), 8,01 (d, 1H), 8,06 (d, 1H), 8,64 (d, 1H), 9,21 (d, 1H) ppm.

EXAMPLE 22

2-(3-Bromo-2-thienyl)-7-cyclopentyl-5-ethylimidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 400 mg (0,97 mmol) crude N-{1-[3-(3-bromo-2-thienyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}cyclopentanecarboxamide, 298 mg (1,95 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 340 mg (89%)

¹H-NMR (400 MHz, CDCl₃): δ=1,32 (t, 3H), 1,66-2,19 (m, 8H), 3,01 (q, 2H), 3,57 (quin., 1H), 7,11 (d, 1H), 7,49 (d, 1H) ppm.

EXAMPLE 23

cis-2-(3-Bromo-2-thienyl)-7-(4-tert-butylcyclohexyl)-5-ethylimidazo[5,1-f][1,2,4]-triazin-4(3H)-one

In analogy to the procedure for Example 1, 611 mg (1,27 mmol) crude cis-N-{1-[3-(3-bromo-2-thienyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-4-tert-butylcyclohexanecarboxamide, 389 mg (2,54 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 275 mg (47%)

¹H-NMR (400 MHz, CD₃OD): δ=0,85 (s, 9H), 1,07-2,42 (m, 12H, t at 1,29), 2,99 (q, 2H), 3,50 (m, 1H), 7,18 (d, 1H), 7,73 (d, 1H) ppm.

EXAMPLE 24

trans-2-(3-Bromo-2-thienyl)-7-(4-tert-butylcyclohexyl)-5-ethylimidazo[5,1-f][1,2,4]-triazin-4(3H)-one

In analogy to the procedure for Example 1, 306 mg (0,64 mmol) crude trans-N-{1-[3-(3-bromo-2-thienyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-4-tert-butylcyclohexanecarboxamide, 292 mg (1,91 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 194 mg (66%)

¹H-NMR (400 MHz, CD₃OD): δ=0,90 (s, 9H), 0,99-1,41 (m, 6H, t at 1,29), 1,69-2,10 (m, 6H), 2,97 (q, 2H), 3,17 (m, 1H), 7,21 (d, 1H), 7,76 (d, 1H) ppm.

EXAMPLE 25

cis/trans-2-(5-Chloro-2-thienyl)-5-ethyl-7-(4-methylcyclohexyl)imidazo[5,1-f]-[1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 731 mg (1,85 mmol) crude N-{1-[3-(5-chloro-2-thienyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]propyl}-4-methylcyclohexanecarboxamide, 851 mg (5,55 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 314 mg (45%/o)

¹H-NMR (300 MHz, CD₃OD): δ=0,87-0,92 (m, 3H), 1,05-2,20 (m, 12H, t at 1,26 and 1,27), 2,90-3,00 (m, 2H), 3,34-3,38 (m, 1H), 7,08 (d, 1H), 7,69 (d, 1H) ppm.

EXAMPLE 26

7-Cyclobutyl-5-ethyl-2-(2-pyrazinyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

200 mg (0.86 mmol, 1 equiv.) of Example 60A are suspended in 10 ml dichloroethane, and 130 mg (1.29 mmol) triethylamine and 102 mg (0.86 mmol) cyclobutanecarbonyl chloride are added. The mixture is stirred at room temperature for one hour, then 198 mg (1.29 mmol) phosphoroxychloride are added. The mixture is stirred at reflux for 3 hours. After cooling down to room temperature, ethyl acetate and saturated NaHCO₃ (aq) are added. The organic phase is washed with saturated NaHCO₃ (aq), water and brine, dried over sodium sulfate and evaporated to dryness in vacuo. The product is purified by chromatography (flash or column chromatography or preparative HPLC).

Yield: 35 mg (14%)

LC/MS (A): MS (ES+): 297 (M+H⁺), retention time 2.04 min.

EXAMPLE 27

7-Cyclopentyl-5-ethyl-2-(2-pyrazinyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 26, 200 mg (0,86 mmol) of Example 60A, 114 mg (0.86 mmol) cyclopentanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 88 mg (33%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=1.2 (t, 3H), 1.5-2.1 (m, 8H), 2.9 (q, 2H), 3.6 (m, 1H), 8.8 (m, 1H), 8.9 (m, 1H), 9.4 (m, 1H), 11.6 (br.s, 1H) ppm.

EXAMPLE 28 AND EXAMPLE 29

7-(4-tert-Butylcyclohexyl)-5-ethyl-2-(2-pyrazinyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 26, 500 mg (2.15 mmol) of Example 60A, 436 mg (2.15 mmol) 4-tert-butylcyclohexanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 177 mg (23%) cis-isomer

28 mg (3%) trans-isomer

cis-isomer (Example 28):

¹H-NMR (DMSO-d₆, 200 MHz): δ=0.9 (s, 9H), 1.1 (m, 1H), 1.2 (t, 3H), 1.5-1.8 (m, 6H), 2.2 (m, 2H), 2.9 (q, 2H), 3.6 (m, 1H), 8.8 (m, 1H), 8.9 (m, 1H), 9.3 (m, 1H), 11.7 (br. s, 1H) ppm.

trans-isomer (Example 29):

¹H-NMR (DMSO-d₆, 200 MHz): δ=0.9 (s, 9H), 1.2 (t, 3H), 1.2 (m, 3H), 1.6 (m, 2H), 1.8 (m, 2H), 2.0 (m, 2H), 2.9 (q, 2H), 3.2 (m, 1H), 8.8 (m, 1H), 8.9 (m, 1H), 9.4 (m, 1H), 11.6 (br. s, 1H) ppm.

EXAMPLE 30

7-Cyclopentyl-5-ethyl-2-(2-methyl-1,3-thiazol-4-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 26, 200 mg (0.60 mmol) of Example 61A, 79 mg (0.60 mmol) cyclopentanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 117 mg (60%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=1.2 (t, 3H), 1.5-1.9 (m, 6H), 2.2 (m, 2H), 2.7 (s, 3H), 2.9 (q, 2H), 3.6 (m, 1H), 8.4 (s, 1H), 11.4 (br. s, 1H) ppm.

EXAMPLE 31

cis-7-(4-tert-Butylcyclohexyl)-5-ethyl-2-(2-methyl-1,3-thiazol-4-yl)imidazo[5,1-f]-[1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 26, 250 mg (0.99 mmol) of Example 61A, 202 mg (0.99 mmol) 4-tert-butylcyclohexanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 98 mg (25%) cis-isomer

¹H-NMR (DMSO-d₆, 200 MHz): δ=0.8 (s, 9H), 1.1 (m, 1H), 1.2 (t, 3H), 1.5-1.7 (m, 6H), 2.2 (m, 2H), 2.7 (s, 3H), 2.9 (q, 2H), 3.5 (m, 1H), 8.3 (s, 1H), 11.4 (br. s, 1H) ppm.

EXAMPLE 32

cis-7-(4-tert-Butylcyclohexyl)-5-ethyl-2-(1,3-thiazol-2-yl)imidazo[5,1-f][1,2,4]-triazin-4(3H)-one

In analogy to the procedure for Example 26, 250 mg (1.05 mmol) of Example 62A, 214 mg (1.05 mmol) 4-tert-butylcyclohexanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 86 mg (21%) cis-isomer

¹H-NMR (DMSO-d₆, 200 MHz): S=0.8 (s, 9H), 1.1 (m, 1H), 1.2 (t, 3H), 1.5-1.7 (m, 6H), 2.2 (m, 2H), 2.9 (q, 2H), 3.5 (m, 1H), 8.1 (m, 2H), 11.9 (br. s, 1H) ppm.

EXAMPLE 33

7-Cyclopentyl-5-ethyl-2-(1,3-thiazol-2-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 26, 150 mg (0.63 mmol) of Example 62A, 84 mg (0.63 mmol) cyclopentanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 73 mg (37%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=1.2 (t, 3H), 1.5-1.9 (m, 6H), 2.1 (m, 2H), 2.9 (q, 2H), 3.5 (m, 1H), 8.1 (m, 2H), 11.9 (br. s, 1H) ppm.

EXAMPLE 34

7-Cyclopentyl-2-(3,5-difluoro-2-pyridinyl)-5-ethylimidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 26, 300 mg (1.12 mmol) of Example 63A, 223 mg (1.68 mmol) cyclopentanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 25 mg (6%)

LC/MS (A): MS (ES+): 346 (M+H⁺), retention time 2.52 min.

EXAMPLE 35 AND EXAMPLE 36

7-(4-tert-Butylcyclohexyl)-2-(3,5-difluoro-2-pyridinyl)-5-ethylimidazo[5,1-f][1,2,4]-triazin-4(3H)-one

In analogy to the procedure for Example 26, 500 mg (1.87 mmol) of Example 63A, 569 mg (2.81 mmol) 4-tert-butylcyclohexanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 4 mg (1%) cis-isomer

17.4 mg (3%) trans-isomer

cis-isomer (Example 35):

LC/MS (A): MS (ES+): 416 (M+H⁺), retention time 3.20 min.

trans-isomer (Example 36):

¹H-NMR (DMSO-d₆, 300 MHz): δ=0.9 (s, 9H), 1.1 (m, 3H), 1.2 (t, 3H), 1.6 (m, 2H), 1.8 (m, 2H), 2.0 (m, 2H), 2.9 (q, 2H), 3.0 (m, 1H), 8.2 (m, 1H), 8.7 (m, 1H), 11.6 (br. s, 1H) ppm.

EXAMPLE 37

cis-7-(4-tert-Butylcyclohexyl)-2-(1,5-dimethyl-1H-pyrrol-2-yl)-5-ethylimidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 26, 250 mg (1.01 mmol) of Example 64A, 205 mg (1.01 mmol) 4-tert-butylcyclohexanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 65 mg (21%) cis-isomer

¹H-NMR (DMSO-d₆, 400 MHz): δ=0.8 (s, 9H), 1.1 (m, 1H), 1.2 (t, 3H), 1.5-1.7 (m, 6H), 2.2 (m, 2H), 2.3 (s, 3H), 2.9 (q, 2H), 3.5 (m, 1H), 3.8 (s, 3H), 6.0 (d, 1H), 7.0 (d, 1H), 12.0 (br. s, 1H) ppm.

EXAMPLE 38

7-Cyclopentyl-2-(1,5-dimethyl-1H-pyrrol-2-yl)-5-ethylimidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 26, 150 mg (0.61 mmol) of Example 64A, 80 mg (0.61 mmol) cyclopentanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 65 mg (33%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=1.2 (t, 3H), 1.5-2.0 (m, 8H), 2.2 (s, 3H), 2.9 (q, 2H), 3.5 (m, 1H), 3.8 (s, 3H), 6.0 (d, 1H), 7.0 (d, 1H), 11.3 (br. s, 1H) ppm.

EXAMPLE 39

2-(3-Bromo-2-pyridinyl)-7-cyclopentyl-5-ethylimidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 26, 100 mg (0.32 mmol) of Example 65A, 43 mg (0.32 mmol) cyclopentanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 30 mg (24%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=1.2 (t, 3H), 1.6 (m, 2H), 1.7 (m, 2H), 1.9 (m, 2H), 2.0 (m, 2H), 2.9 (q, 2H), 3.5 (m, 1H), 7.6 (d/d, 1H), 8.3 (d/d, 1H), 8.7 (d/d, 1H), 11.9(s, 1H) ppm.

EXAMPLE 40

cis-2-(3-Bromo-2-pyridinyl)-7-(4-tert-butylcyclohexyl)-5-ethylimidazo[5,1-f]-[1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 26, 110 mg (0.35 mmol) of Example 65A, 72 mg (0.35 mmol) 4-cis-tert-butylcyclohexanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 92 mg (56%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=0.8 (s, 9H), 1.1 (m, 1H), 1.2 (t, 3H), 1.5-1.7 (m, 6H), 2.2 (m, 2H), 2.9 (q, 2H), 3.4 (m, 1H), 7.6 (d/d, 1H), 8.3 (d/d, 1H), 8.7 (d/d, 1H), 12.0 (s, 1H) ppm.

EXAMPLE 41

cis-7-(4-tert-Butylcyclohexyl)-2-(3-chloro-2-pyridinyl)-5-ethylimidazo[5,1-f][1,2,4]-triazin-4(3H)-one

In analogy to the procedure for Example 26, 150 mg (0.56 mmol) of Example 66A, 114 mg (0.56 mmol) 4-cis-tert-butylcyclohexanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 106 mg (45%)

¹H-NMR (DMSO-d₆, 300 MHz): δ=0.8 (s, 9H), 1.1 (m, 1H), 1.2 (t, 3H), 1.5-1.7 (m, 6H), 2.2 (m, 2H), 2.9 (q, 2H), 3.4 (m, 1H), 7.7 (d/d, 1H), 8.2 (d/d, 1H), 8.7 (d/d, 1H), 11.9 (s, 1H) ppm.

EXAMPLE 42

2-(3-Chloro-2-pyridinyl)-7-cyclopentyl-5-ethylimidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 26, 150 mg (0.56 mmol) of Example 66A, 75 mg (0.56 mmol) cyclopentanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 119 mg (61%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=1.2 (t, 3H), 1.5-2.0 (m, 8H), 2.9 (q, 2H), 3.4 (m, 1H), 7.7 (did, 1H), 8.2 (d/d, 1H), 8.7 (d/d, 1H), 11.9 (s, 1H) ppm.

EXAMPLE 43

7-Cyclopentyl-5-ethyl-2-(1H-pyrrol-2-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 26, 150 mg (0.68 mmol) of Example 67A, 91 mg (0.68 mmol) cyclopentanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 100 mg (49%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=1.2 (t, 3H), 1.7 (m, 2H), 1.8 (m, 4H), 2.1 (m, 2H), 2.9 (q, 2H), 3.6 (m, 1H), 6.2 (m, 1H), 7.0 (m, 1H), 7.2 (m, 1H), 11.4 (s, 1H), 11.5 (br. s, 1H) ppm.

EXAMPLE 44

7-Cyclopentyl-5-ethyl-2-(3-furyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 26, 250 mg (1.14 mmol) of Example 68A, 150 mg (1.14 mmol) cyclopentanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 48 mg (14%)

¹H-NMR (DMSO-d₆, 200 MHz): δ=1.2 (t, 3H), 1.7 (m, 2H), 1.8 (m, 4H), 2.1 (m, 2H), 2.9 (q, 2H), 3.6 (m, 1H), 7.0 (m, 1H), 7.9 (m, 1H), 8.5 (m, 1H), 11.7 (s, 1H) ppm.

EXAMPLE 45

cis-7-(4-tert-Butylcyclohexyl)-5-ethyl-2-(3-furyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 26, 500 mg (2.27 mmol) of Example 68A, 460 mg (2.27 mmol) 4-cis-tert-butylcyclohexanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 101 mg (12%)

¹H-NMR (DMSO-d₆, 300 MHz): δ=0.8 (s, 9H), 1.1 (m, 1H), 1.2 (t, 3H), 1.6 (m, 2H), 1.8 (m, 4H), 2.2 (m, 2H), 2.9 (q, 2H), 3.6 (m, 1H), 7.0 (m, 1H), 7.9 (m, 1H), 8.5 (m, 1H), 11.7 (br. s, 1H), 11.9 (s, 1H) ppm.

EXAMPLE 46

cis-7-(4-tert-Butylcyclohexyl)-5-ethyl-2-(1-methyl-1H-pyrrol-2-yl)imidazo[5,1-f]-[1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 26, 1000 mg (4.29 mmol) of Example 69A, 434 mg (2.14 mmol) 4-cis-tert-butylcyclohexanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 24 mg (2%)

¹H-NMR (DMSO-d₆, 300 MHz): δ=0.8 (s, 9H), 1.1 (m, 1H), 1.2 (t, 3H), 1.6 (m, 6H), 2.2 (m, 2H), 2.9 (q, 2H), 3.5 (m, 1H), 3.9 (s, 3H), 6.1 (m, 1H), 7.1 (m, 2H), 11.4 (s, 1H) ppm.

EXAMPLE 47

7-Cyclopentyl-5-ethyl-2-(1-methyl-1H-pyrrol-2-yl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 26, 500 mg (2.14 mmol) of Example 69A, 142 mg (1.07 mmol) cyclopentanecarbonyl chloride and proportionate amounts of the other reagents are used.

Yield: 36 mg (5%/O)

¹H-NMR (DMSO-d₆, 200 MHz): δ=1.2 (t, 3H), 1.6 (m, 2H), 1.7 (m, 2H), 1.9 (m, 2H), 2.0 (m, 2H), 2.9 (q, 2H), 3.5 (m, 1H), 3.9 (s, 3H), 6.1 (m, 1H), 7.1 (m, 2H), 11.3 (s, 1H) ppm.

EXAMPLE 48

5-Ethyl-2-(2-thienyl)-7-[3-(trifluoromethyl)cyclohexyl]imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 160 mg (0,39 mmol) of Example 75A, 165 mg (1,07 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 11.9 mg (8%)

¹H-NMR (200 MHz, DMSO): δ=1.20 (t, 3H); 1.50-2.20 (m, 8H); 2.60 (m, 1H); 2.90 (quart., 2H); 3.30 (m, 1H); 7.20 (m, 1H); 7.80 (m, 1H); 8.10 (m, 1H); 12.00 (s, 1H).

Beispiel 49

5-Ethyl-7-(4-methylcyclohexyl)-2-(2-thienyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 150 mg (0,42 mmol) of Example 76A, 165 mg (1,07 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 21 mg (15%) of an isomeric mixture

¹H-NMR (200 MHz, DMSO): δ=0.90-1.00 (2d, 3H); 1.20 (2t, 3H); 1.50-2.20 (m, 9H); 2.90 (2 quart., 2H); 3.20 (m, 1H); 7.20 (m, 1H); 7.80 (m, 1H); 8.10 (m, 1H); 12.00 (s, 1H).

EXAMPLE 50

7-(Cyclohexylmethyl)-5-ethyl-2-(2-thienyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 150 mg (0,42 mmol) of Example 77A, 165 mg (1,07 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 100 mg (70%)

¹H-NMR (200 MHz, DMSO): =0.90-1.30 (m, 9H); 1.60 (m, 4H), 1.85 (m, 1H); 2.90 (m, 4H); 7.20 (m, 1H); 7.80 (m, 1H); 8.10 (m, 1H); 12.00 (s, 1H).

EXAMPLE 51

7-(1,4-Dimethylcyclohexyl)-5-ethyl-2-(2-thienyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 150 mg (0,40 mmol) of Example 78A, 165 mg (1,07 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 90 mg (63%)

¹H-NMR (200 MHz, DMSO): δ=0.70-2.10 (m, 18H); 2.91 (quart., 2H); 7.20 (m, 1H); 7.80 (m, 1H); 8.10 (m, 1H); 12.20 (s, 1H).

EXAMPLE 52

7-(1-Adamantyl)-5-ethyl-2-(2-thienyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 169 mg (0,42 mmol) of Example 79A, 329 mg (2,15 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 20.5 mg (13%)

¹H-NMR (300 MHz, DMSO): δ=1.20 (t, 3H); 1.80 (m, 6H); 2.10 (m, 3H); 2.25 (m, 6H); 2.80 (quart., 2H); 7.20 (m, 1H); 7.80 (m, 1H); 8.10 (m, 1H); 12.00 (s, 1H).

EXAMPLE 53 AND EXAMPLE 54

7-(4-tert-Butylcyclohexyl)-5-ethyl-2-(3-pyridinyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 200 mg (0,50 mmol) of Example 80A, 165 mg (1,07 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 7 mg (4%) cis-isomer

9 mg (5%) trans-isomer

cis-isomer (Example 53):

¹H-NMR (CDCl₃, 200 MHz): δ=0.8 (s, 9H), 1.1 (m, 1H), 1.4 (t, 3H), 1.5-1.7 (m, 6H), 2.4 (m, 2H), 3.0 (q, 2H), 3.6 (m, 1H), 7.5 (m, 1H), 8.3 (m, 1H), 8.8 (m, 1H), 9.2 (s, 1H), 9.9 (s, 1H) ppm.

trans-isomer (Example 54):

¹H-NMR (CDCl₃, 200 MHz): δ=0.8 (s, 9H), 1.2 (m, 3H), 1.3 (t, 3H), 1.8 (m, 4H), 2.1 (m, 2H), 3.0 (q, 2H), 3.2 (m, 1H), 7.5 (m, 1H), 8.3 (m, 1H), 8.8 (m, 1H), 9.3 (s, 1H), 10.2 (s, 1H) ppm.

EXAMPLE 55

7-(4-cis-tert-Butylcyclohexyl)-5-ethyl-2-(2-pyridinyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 200 mg (0,50 mmol) of Example 81A, 165 mg (1,07 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 44 mg (23%)

¹H-NMR (d₆-DMSO, 200 MHz): δ=0.8 (s, 9H), 1.1 (m, 1H), 1.2 (t, 3H), 1.5-1.7 (m, 6H), 2.4 (m, 2H), 2.9 (q, 2H), 3.6 (m, 1H), 7.6 (m, 1H), 8.1 (m, 1H), 8.2 (m, 1H), 8.7 (m, 1H), 11.3 (s, 1H) ppm.

EXAMPLE 56

7-(4-cis-tert-Butylcyclohexyl)-5-ethyl-2-(4-pyridinyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 200 mg (0,42 mmol) of Example 82A, 165 mg (1,07 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 9.6 mg (5%)

¹H-NMR (d₆-DMSO, 200 MHz): δ=0.8 (s, 9H), 1.1 (m, 1H), 1.2 (t, 3H), 1.5-1.7 (m, 6H), 2.2 (m, 2H), 2.9 (q, 2H), 3.6 (m, 1H), 7.9 (m, 2H), 8.8 (m, 2H), 11.9 (s, 1H) ppm.

EXAMPLE 57

7-(4-cis-tert-Butylcyclohexyl)-2-(2,5-dichloro-1,3-thiazol-4-yl)-5-ethylimidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 50 mg (0,11 mmol) of Example 83A, 165 mg (1,07 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 11.7 mg (24%)

¹H-NMR (d₆-DMSO, 200 MHz): δ=0.8 (s, 9H), 1.1 (m, 1H), 1.2 (t, 3H), 1.5-1.7 (m, 6H), 2.2 (m, 2H), 2.9 (q, 2H), 3.5 (m, 1H), 11.9 (s, 1H) ppm.

EXAMPLE 58

7-(4-tert-Butylcyclohexyl)-5-ethyl-2-(2-furyl)imidazo[5,1-f][1,2,4]triazin-4(3H)-one

In analogy to the procedure for Example 1, 250 mg (0,65 mmol) of Example 84A, 250 mg (1,61 mmol) phosphoric trichloride are stirred at reflux for 3 hours, proportionate amounts of the solvents are used.

Yield: 67 mg (28%)

¹H-NMR (d₆-DMSO, 200 MHz): δ=0.8 (s, 9H), 1.1 (m, 1H), 1.2 (t, 3H), 1.5-1.7 (m, 6H), 2.1 (m, 2H), 2.9 (q, 2H), 3.5 (m, 1H), 6.7 (m, 1H), 7.5 (m, 1H), 7.9 (m, 2H), 11.8 (s, 1H) ppm.

Claims

1. A compound of the general formula (I)

2. A compound according to claim 1, whereby R1 denotes furanyl, thiophenyl, thiazolyl, pyridyl, chinolyl or isochinolyl, which are optionally substituted by identical or different residues selected from the group consisting of halogen, (C1-C4)-alkyl, trifluoromethyl, cyano, nitro und trifluoromethoxy.

3. A compound according to claim 1 or 2, whereby R2 denotes (C4-C7)-cycloalkyl, which is optionally substituted up to two times by identical or different (C1-C5)-alkyl residues, or denotes (C3-C8)-alkyl, which is optionally substituted by a (C4-C7)-cycloalkyl.

4. A process for the preparation of the compounds according to claim 1, characterized in that, compounds of the general formula (IV),

5. A compound of the general formula (IV) according to claim 4.

6. (canceled)

7. Pharmaceutical composition containing at least one compound according to any one of claims 1 to 3 and a pharmacologically acceptable diluent.

8. A process for preparing a medicament, wherein a compound according to any one of claims 1 to 3 is converted into a medicament.

9. (canceled)

10. (canceled)

11. The process of claim 8 wherein the medicament is a medicament for the treatment and/or prophylaxis of inflammatory processes and/or immune diseases.

12. The process of claim 8 wherein the medicament is a medicament for the treatment and/or prophylaxis of chronic obstructive pulmonary disease and/or asthma.

13. A method of preventing or treating an inflammatory process and/or immune disease, comprising administering to a patient in need thereof an effective amount of a compound of claim 1.