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Definitions

• the invention relates to novel triazolophthalazine derivatives, which can be used in the pharmaceutical industry for the production of pharmaceutical compositions.
• Triazolophthalazines are known from prior art. For example, EP85840, WO98/04559, WO98/50385,
• WO99/06407 (corresponding to US6313125), WO02/083140, WO00/26218 (corresponding to
• WO01 /47929 describes triazolotriazinones with PDE2 inhibiting activity.
• R1 is -U-A, in which
• U is a direct bond, or methylene (-CH 2 -),
• A is phenyl, pyridinyl, thiophenyl, or R11- and/or R111 -substituted phenyl, in which R11 is 1-4C-alkyl, halogen, trifluoromethyl, hydroxyl, 1-4C-alkoxy, completely or predominantly fluorine-substituted 1-4C-alkoxy, phenoxy, 1-4C-alkoxycarbonyl, morpholino, or di-1-4C- alkylamino,
• R111 is 1-4C-alkoxy, halogen, hydroxyl, or 1-4C-alkyl
• R2 is hydrogen, 1-4C-alkyl, 1-4C-alkoxy, phenyl-1-4C-alkoxy, phenoxy, 3-7C-cycloalkoxy, 3-7C- cycloalkylmethoxy, halogen, trifluoromethyl, nitro, phenyl, R21 -substituted phenyl, completely or predominantly fluorine-substituted 1-4C-alkoxy, 1-4C-alkylthio, cyano-1-4C-alkyl, or -N(R22)R23, in which
• R21 is 1-4C-alkoxy, halogen or 1-4C-alkyl
• Het1 is optionally substituted by R24, and is a 3- to 7-membered monocyclic fully saturated heterocyclic ring radical comprising the nitrogen atom, to which R22 and R23 are bonded, and optionally one further heteroatom selected from nitrogen, oxygen and sulphur, in which
• R24 is 1-4C-alkyl
• R3 is hydrogen, 1-4C-alkyl, 1-4C-alkoxy or halogen
• 1-4C-Alkyl is a straight-chain or branched alkyl radical having 1 to 4 carbon atoms. Examples are the butyl, isobutyl, sec-butyl, tert-butyl, propyl, isopropyl, and, particularly, the ethyl and methyl radicals.
• Halogen within the meaning of the present invention is iodine or, in particular, bromine, chlorine or fluorine.
• 1-4C-Alkoxy represents radicals which, in addition to the oxygen atom, contain a straight-chain or branched alkyl radical having 1 to 4 carbon atoms. Examples which may be mentioned are the butoxy, isobutoxy, sec-butoxy, tert-butoxy, propoxy, isopropoxy and, particularly, the ethoxy and methoxy radicals.
• 1-4C-Alkoxycarbonyl is a carbonyl group to which one of the abovementioned 1-4C-alkoxy radicals is bonded.
• Examples are the methoxycarbonyl (CH 3 O-C(O)-) and the ethoxycarbonyl (CH 3 CH 2 O-C(O)-) radical.
• 3-7C-Cycloalkylmethoxy stands for cyclopropylmethoxy, cyclobutylmethoxy, cyclopentylmethoxy, cyclohexylmethoxy or cycloheptylmethoxy, of which cyclopropylmethoxy and cyclopentylmethoxy are to be emphasized.
• 3-7C-Cycloalkoxy represents cyclopropyloxy, cyclobutyloxy, cyclopentyloxy, cyclohexyloxy and cyclo- heptyloxy, of which cyclopropyloxy, cyclobutyloxy and cyclopentyloxy are preferred.
• Completely or predominantly fluorine-substituted 1-4C-alkoxy is, for example, the 2,2,3,3,3- pentafluoropropoxy, the perfluoroethoxy, the 1 ,2,2-trifluoroethoxy and in particular the 1 ,1 ,2,2- tetrafluoroethoxy, the 2,2,2-trifluoroethoxy, the trifluoromethoxy and the difluoromethoxy radical, of which the difluoromethoxy radical is preferred.
• "Predominantly” in this connection means that more than half of the hydrogen atoms of the 1-4C-alkoxy groups are replaced by fluorine atoms.
• Di-1-4C-alkylamino stands for an amino group, which is substituted by two different or two identical of the abovementioned 1-4C-alkyl radicals. Examples are the dimethylamino, the diethylamino and the diisopropyl radical.
• Di-(I -4C-alkoxy)-phenyl stands for a phenyl radical, which is substituted at any possible positions by two of the abovementioned 1-4C-alkoxy radicals, which may be the same or different.
• Phenyl-1-4C-alkoxy stands for one of the abovementioned 1-4C-alkoxy radicals, which is substituted by the phenyl radical. Examples which may be mentioned are the benzyloxy and the phenethoxy radical.
• Cyano-1-4C-alkyl stands for one of the abovementioned 1-4C-alkyl radicals, which is substituted by the cyano group. Examples which may be mentioned are the cyanomethyl and the 2-cyanoethyl radical.
• 4N-(1-4C-Alkyl)-piperazin-1-yl stands for a piperazine-1-yl radical which is substituted at its nitrogen atom in the 4-position by one of the abovementioned 1-4C-alkyl radicals, such as e.g. 4N-methyl- piperazin-1-yl.
• 1-4C-Alkylthio represents radicals which, in addition to the sulfur atom, contain one of the abovementioned 1-4C-alkyl radicals. Examples which may be mentioned are the butylthio, propylthio and preferably the ethylthio and methylthio radicals.
• Het1 is optionally substituted by R24, and is a 3- to 7-membered monocyclic fully saturated heterocyclic ring radical comprising the nitrogen atom, to which R22 and R23 are bonded, and optionally one further heteroatom selected from nitrogen, oxygen and sulphur.
• Het1 stands for a 3- to 7-membered monocyclic fully saturated heterocyclic ring radical comprising the nitrogen atom, to which R22 and R23 are bonded, and optionally one further heteroatom selected from NH, N(R24), oxygen and sulphur.
• Het1 may include, for example, without being restricted thereto, aziridin-1-yl, azetidin-1-yl, pyrrolidin- 1-yl, piperidin-1-yl, homopiperidin-1-yl, morpholin-4-yl, thiomorpholin-4-yl, piperazin-1-yl and homopiperazin-1-yl.
• Het1 As further examples for Het1 according to this invention may be mentioned, without being restricted thereto, R24-substituted derivatives of the abovementioned exemplary Het1 radicals, such as e.g. 4N- (R24)-piperazin-1-yl or 4N-(R24)-homopiperazin-1-yl.
• R24-substituted derivatives of the abovementioned exemplary Het1 radicals such as e.g. 4N- (R24)-piperazin-1-yl or 4N-(R24)-homopiperazin-1-yl.
• Het1 radical may be mentioned, without being restricted thereto, 4N-(1-4C-alkyl)-piperazin-1-yl, such as e.g. 4N-methyl-piperazin-1-yl, or, particularly, morpholin-4-yl.
• heterocyclic groups mentioned herein refer, unless otherwise mentioned, to all of the possible isomeric forms thereof.
• heterocyclic groups mentioned herein refer, unless otherwise noted, in particular to all of the possible positional isomers thereof.
• pyridyl or pyridinyl alone or as part of another group, include pyridin-2-yl, pyridin-3-yl and pyridin-4-yl, or the term thiophenyl includes thiophen-2-yl and thiophen-3-yl.
• heterocyclic groups mentioned herein may be substituted by their given substituents, unless otherwise noted, at any possible position, such as e.g. at any substitutable ring carbon or ring nitrogen atom.
• any heteroatom of a heterocyclic ring with unsatisfied valences mentioned herein is assumed to have the hydrogen atom(s) to satisfy the valences.
• each definition is independent.
• the substituents R2 and R3 of compounds of formula I can be attached in the ortho, meta or para position with respect to the binding position in which the phenyl ring is bonded to the amino group, whereby preference is given to the attachement in the meta or para position.
• Suitable salts for compounds according to this invention - depending on substitution - are all acid addition salts or all salts with bases. Particular mention may be made of the pharmacologically tolerable inorganic and organic acids and bases customarily used in pharmacy. Those suitable are, on the one hand, water-insoluble and, particularly, water-soluble acid addition salts with acids such as, for example, hydrochloric acid, hydrobromic acid, phosphoric acid, nitric acid, sulphuric acid, acetic acid, citric acid, D-gluconic acid, benzoic acid, 2-(4-hydroxybenzoyl)benzoic acid, butyric acid, sulphosalicylic acid, maleic acid, lauric acid, malic acid, fumaric acid, succinic acid, oxalic acid, tartaric acid, embonic acid, stearic acid, toluenesulphonic acid, methanesulphonic acid or 3-hydroxy-2- naphthoic acid, the acids being employed in salt preparation
• salts with bases are - depending on substitution - also suitable.
• salts with bases are mentioned the lithium, sodium, potassium, calcium, aluminium, magnesium, titanium, ammonium, meglumine or guanidinium salts, here, too, the bases being employed in salt preparation in an equimolar quantitative ratio or one differing therefrom.
• Pharmacologically intolerable salts which can be obtained, for example, as process products during the preparation of the compounds according to this invention on an industrial scale, are converted into pharmacologically tolerable salts by processes known to the person skilled in the art.
• the compounds according to this invention as well as their salts may contain, e.g. when isolated in crystalline form, varying amounts of solvents. Included within the scope of the invention are therefore all solvates and in particular all hydrates of the compounds according to this invention as well as all solvates and in particular all hydrates of the salts of the compounds according to this invention.
• R1 is -U-A, in which
• U is a direct bond, or methylene (-CH 2 -),
• A is phenyl, pyridinyl, thiophenyl, di-(1-4C-alkoxy)-phenyl, or R11 -substituted phenyl, in which
• R11 is 1-4C-alkyl, halogen, trifluoromethyl, hydroxyl, 1-4C-alkoxy, completely or predominantly fluorine-substituted 1-4C-alkoxy, phenoxy, 1-4C-alkoxycarbonyl, morpholino, or di-1-4C- alkylamino,
• R2 is hydrogen, 1-4C-alkyl, 1-4C-alkoxy, phenyl-1-4C-alkoxy, phenoxy, 3-7C-cycloalkoxy, 3-7C- cycloalkylmethoxy, halogen, phenyl, R21 -substituted phenyl, completely or predominantly fluorine-substituted 1-4C-alkoxy, 1-4C-alkylthio, cyano-1-4C-alkyl, or -N(R22)R23, in which
• R21 is 1-4C-alkoxy, halogen or 1-4C-alkyl
• Het1 is a 3- to 7-membered monocyclic fully saturated heterocyclic ring radical comprising the nitrogen atom, to which R22 and R23 are bonded, and optionally one further heteroatom selected from N(R24), oxygen or sulphur, in which
• R24 is 1-4C-alkyl
• R3 is hydrogen, 1-4C-alkyl, 1-4C-alkoxy or halogen, and the salts of these compounds.
• R1 is -U-A, in which U is a direct bond, or methylene (-CH 2 -),
• A is phenyl, pyridinyl, thiophenyl, dimethoxyphenyl, or R11 -substituted phenyl, in which
• R11 is methyl, tertbutyl, chlorine, fluorine, bromine, trifluoromethyl, hydroxyl, methoxy, ethoxy, trifluoromethoxy, phenoxy, methoxycarbonyl, morpholino, or dimethylamino,
• R2 is hydrogen, 1-4C-alkyl, 1-4C-alkoxy, phenyl-1-4C-alkoxy, phenoxy, halogen, phenyl, R21- substituted phenyl, completely or predominantly fluorine-substituted 1-4C-alkoxy, 1-4C- alkylthio, cyano-1-4C-alkyl, or -N(R22)R23, in which R21 is 1-4C-alkoxy, R22 and R23 together and with inclusion of the nitrogen atom, to which they are attached, form a heterocyclic ring Het1 , in which Het1 is pyrrolidin-1-yl, piperidin-1-yl, morpholin-4-yl, thiomorpholin-4-yl, or 4N-(1-4C-alkyl)- piperazin-1-yl,
• R3 is hydrogen or 1-4C-alkoxy, and the salts of these compounds.
• R1 is -U-A, in which
• U is a direct bond, or methylene (-CH 2 -),
• A is phenyl, or R11 -substituted phenyl, in which
• R11 is methyl, chlorine, fluorine, bromine, trifluoromethyl, hydroxyl, methoxy, phenoxy, methoxycarbonyl, or dimethylamino, whereby in particular A is 4-methoxy-phenyl, 2-methoxy-phenyl, 2-bromo-phenyl, 4-bromo-phenyl, 2-fluoro-phenyl, 2-
• R2 is hydrogen, 1-4C-alkyl, 1-4C-alkoxy, phenyl-1-4C-alkoxy, phenoxy, halogen, phenyl, R21- substituted phenyl, completely or predominantly fluorine-substituted 1-4C-alkoxy, 1-4C- alkylthio, cyano-1-4C-alkyl, or -N(R22)R23, in which
• R21 is 1-4C-alkoxy
• Het1 is morpholin-4-yl, or 4N-(1-4C-alkyl)-piperazin-1-yl,
• R3 is hydrogen or 1-4C-alkoxy, and the salts of these compounds.
• R1 is -U-A, in which
• U is a direct bond, or methylene (-CH 2 -),
• A is phenyl, 4-methoxy-phenyl, 2-methoxy-phenyl, 2-hydroxy-phenyl, 2-bromo-phenyl, 4-bromo- phenyl, 2-fluoro-phenyl, 2-(trifluoromethyl)-phenyl, 2-methyl-phenyl, 3-methoxy-phenyl, 3- bromo-phenyl, 3-fluoro-phenyl, 2-dimethylamino-phenyl, methoxycarbonyl, phenoxy, or 3-
• R2 is hydrogen, 1-4C-alkyl, 1-4C-alkoxy, phenyl-1-4C-alkoxy, phenoxy, halogen, phenyl, R21- substituted phenyl, completely or predominantly fluorine-substituted 1-4C-alkoxy, 1-4C- alkylthio, cyano-1-4C-alkyl, or -N(R22)R23, in which R21 is 1-4C-alkoxy, R22 and R23 together and with inclusion of the nitrogen atom, to which they are attached, form a heterocyclic ring Het1 , in which
• Het1 is morpholin-4-yl, or 4N-(1-4C-alkyl)-piperazin-1-yl, R3 is hydrogen or 1-4C-alkoxy, and the salts of these compounds.
• R1 is -U-A, in which
• A is phenyl, or R11 -substituted phenyl, in which
• R11 is fluorine, bromine, trifluoromethyl, or methoxy, whereby in particular
• R1 is 4-methoxy-phenyl, 2-methoxy-phenyl, 3-methoxy-phenyl, 2-bromo-phenyl, 3-bromo-phenyl,
• R1 is 4-methoxy-phenyl, or 2-bromo-phenyl
• R2 is hydrogen, methyl, methoxy, ethoxy, benzyloxy, chlorine, phenoxy, phenyl, 4-methoxy- phenyl, trifluoromethoxy, difluoromethoxy, methylthio, cyanomethyl, or -N(R22)R23, in which
• Het1 is morpholin-4-yl, or 4N-methyl-piperazin-1-yl,
• R3 is hydrogen, methoxy or ethoxy, and the salts of these compounds.
• R1 is 4-methoxy-phenyl, 2-methoxy-phenyl, 3-methoxy-phenyl, 2-bromo-phenyl, 3-bromo-phenyl, 4-bromo-phenyl, 2-fluoro-phenyl, 3-fluoro-phenyl, 2-(trifluoromethyl)-phenyl, or 3- (trifluoromethyl)-phenyl;
• R2 is hydrogen, methyl, methoxy, ethoxy, benzyloxy, chlorine, phenoxy, phenyl, 4-methoxy- phenyl, trifluoromethoxy, difluoromethoxy, methylthio, cyanomethyl, or -N(R22)R23, in which
• Het1 is morpholin-4-yl, or 4N-methyl-piperazin-1-yl,
• R3 is hydrogen, methoxy or ethoxy, and the salts of these compounds.
• R1 is phenyl, 2-hydroxy-phenyl, 4-phenoxy-phenyl, 3-methoxy-carbonyl-phenyl, 4-methoxy- carbonyl-phenyl, 4-morpholin-4-yl-phenyl, 4-methoxy-benzyl
• R2 is -N(R22)R23, in which R22 and R23 together and with inclusion of the nitrogen atom, to which they are attached, form a heterocyclic ring Het1 , which is morpholin-4-yl
• R3 is hydrogen, and the salts of these compounds.
• R1 is 4-methoxy-phenyl
• R2 is hydrogen, methyl, methoxy, ethoxy, phenyl-methoxy, phenoxy, chloro, bromo, R21- substituted phenyl, trifluoromethoxy, difluoromethoxy, methylthio, cyano-1-4C-alkyl, or -
• N(R22)R23 in which R21 is methoxy, R22 and R23 together and with inclusion of the nitrogen atom, to which they are attached, form a heterocyclic ring Het1 , which is morpholin-4-yl, or 4N-methyl-piperazin-1-yl, R3 is hydrogen, and the salts of these compounds.
• a special interest in the compounds according to this invention refers to those compounds of formula I which are included -within the scope of this invention- by one or, when possible, by more of the following special embodiments:
• a special embodiment (embodiment 1 ) of the compounds according to the present invention refers to those compounds of formula I, in which
• A is phenyl, or R11 -substituted phenyl.
• A is pyridinyl or thiophenyl, such as e.g. pyridin-4-yl.
• A is phenyl, or R11 -substituted phenyl.
• A is pyridinyl or thiophenyl, such as e.g. thiophen-2-yl.
• R1 is (4-methoxy-phenyl)-methyl, or 4-methoxy-phenyl.
• Another special embodiment (embodiment 6) of the compounds according to the present invention refers to those compounds of formula I, in which R1 is 4-methoxy-phenyl.
• R1 is (4-methoxy-phenyl)-methyl, 2-hydroxy-phenyl, phenyl, 3-methoxycarbonyl-phenyl, or
• R1 is 4-methoxy-phenyl, 2-methoxy-phenyl, 4-bromo-phenyl, 2-bromo-phenyl, 2-fluoro-phenyl, or 2-(trifluoromethyl)-phenyl.
• Another special embodiment (embodiment 9) of the compounds according to the present invention refers to those compounds of formula I, in which R1 is 2-bromo-phenyl.
• R2 is methyl, methoxy, ethoxy, benzyloxy, chlorine, phenoxy, phenyl, 4-methoxy-phenyl, trifluoromethoxy, difluoromethoxy, methylthio, cyanomethyl, or -N(R22)R23, in which R22 and R23 together and with inclusion of the nitrogen atom, to which they are attached, form a heterocyclic ring Het1 , in which
• Het1 is morpholin-4-yl, or 4N-methyl-piperazin-1-yl, and R3 is hydrogen.
• R2 is methoxy, ethoxy, phenoxy, cyanomethyl, or -N(R22)R23, in which
• Het1 is morpholin-4-yl, or 4N-methyl-piperazin-1-yl, and R3 is hydrogen.
• Another special embodiment (embodiment 11) of the compounds according to the present invention refers to those compounds of formula I, in which R2 is attached in the meta position with respect to the binding position in which the phenyl ring is bonded to the amino group of the triazolophthalazine scaffold, and R3 is attached in the meta or para position with respect to the binding position in which the phenyl ring is bonded to the amino group of the triazolophthalazine scaffold.
• R2 is attached in the para position with respect to the binding position in which the phenyl ring is bonded to the amino group of the triazolophthalazine scaffold
• R3 is attached in the meta position with respect to the binding position in which the phenyl ring is bonded to the amino group of the triazolophthalazine scaffold.
• a special group of the compounds according to the present invention refers to those compounds of formula I, in which
• R1 is 4-methoxy-phenyl, 2-methoxy-phenyl, 4-bromo-phenyl, 2-bromo-phenyl, 2-fluoro-phenyl, or
• R2 is attached in the para or meta position with respect to the binding position in which the phenyl ring is bonded to the amino group of the triazolophthalazine scaffold, and is cyanomethyl, or
• the compounds according to the invention can be prepared e.g. as described exemplarily as follows and according to the following specified reaction steps, or, particularly, in a manner as described by way of example in the following examples, or analogously or similarly thereto according to preparation procedures or synthesis strategies known to the person skilled in the art.
• Said nucleophilic substitution reaction can be carried out as described in the following examples or as known to the skilled person; thus, depending on the reactivity of the reactants, it can be carried out by melting the reaction partners without solvent together or by reacting the reaction partners in a suitable solvent, such as e.g. N,N-dimethylformamide, in the presence of a suitable base, such as e.g. sodium hydride or potassium carbonate, at a temperature to allow the reaction to proceede (this may be e.g., depending on the reactants, ambient temperature, elevated temperature, or reflux temperature of the solvent used or, under appropriate conditions, beyond it), optionally under microwave irradiation.
• a suitable solvent such as e.g. N,N-dimethylformamide
• a suitable base such as e.g. sodium hydride or potassium carbonate
• Said reactions can be carried out as described in the following examples, or under conditions known to the skilled person or analogously to art-known reactions similar thereto.
• the aforementioned one-step cyclization reaction can be carried out similarly as described in J. Med. Chem. Vol. 31 , 1988, p. 1115, in a suitable solvent, such as e.g. toluene, pyridine or dioxane, in the presence of a suitable base (e.g. triethylamine) at elevated temperature or the reflux temperature of the solvent used.
• a suitable solvent such as e.g. toluene, pyridine or dioxane
• a suitable base e.g. triethylamine
• Compounds of formula IV can be obtained by nucleophilic substitution of compounds of formula V, in which X and X' can be the same and are suitable leaving groups, particularly X and X' are both chlorine, and hydrazine.
• compounds of the formula I can be converted into their salts, or, optionally, salts of the compounds of the formula I can be converted into the free compounds.
• the substances of formula I according to the invention are isolated and purified in a manner known per se, for example by distilling off the solvent under reduced pressure and recrystallizing the residue obtained from a suitable solvent or subjecting it to one of the customary purification methods, such as, for example, column chromatography on a suitable support material.
• Salts are obtained by dissolving the free compound in a suitable solvent (e.g. a ketone, such as acetone, methyl ethyl ketone or methyl isobutyl ketone, an ether, such as diethyl ether, tetrahydrofuran or dioxane, a chlorinated hydrocarbon, such as methylene chloride or chloroform, or a low-molecular- weight aliphatic alcohol, such as ethanol or isopropanol) which contains the desired acid or base, or to which the desired acid or base is then added.
• a suitable solvent e.g. a ketone, such as acetone, methyl ethyl ketone or methyl isobutyl ketone, an ether, such as diethyl ether, tetrahydrofuran or dioxane, a chlorinated hydrocarbon, such as methylene chloride or chloroform, or a low-molecular- weight
• Salts obtained can be converted into the free compounds, which can in turn be converted into salts, by alkalization or by acidification. In this manner, pharmacologically unacceptable salts can be converted into pharmacologically acceptable salts.
• the conversions mentioned in this invention can be carried out analogously or similarly to methods which are familiar per se to the person skilled in the art.
• MS stands for mass spectrum
• M molecular ion in mass spectrometry
• m.p. for melting pount
• EF for empirical formula
• MW molecular weight
• fnd. for found
• h for hours
• abbreviations have their meanings customary per se to the skilled person.
• the product is purified by column chromatography via silica gel.
• the compounds according to the invention have useful pharmacological properties which make them industrially utilizable.
• selective inhibitors of cyclic GMP-hydrolysing phosphodiesterases (cGMP- PDE inhibitors) - prefentially of type 2 - they are suitable on the one hand as therapeutics for conditions of pathologically enhanced endothelial activity and impaired endothelial barrier function such as septic shock, vascular edema, or diseases associated with unwanted neoangiogenesis.
• cGMP- PDE inhibitors cyclic GMP-hydrolysing phosphodiesterases
• the compounds according to the invention can be employed in human and veterinary medicine as therapeutics, where they can be used, for example, for the treatment and prophylaxis of the following illnesses: (1) all conditions of pathologically enhanced endothelial activity/impaired endothelial barrier function such as multi-organ failure in particular acute respiratory distress syndrome (ARDS) in septic shock, pneumonia, acute and chronic airway disorders of varying origin (rhinitis, bronchitis, bronchial asthma, emphysema, COPD), angioedema, peripheral edema, cerebral edema for example traumatic or following stroke; (2) all conditions associated with pathologically enhanced neoangiogenesis such as all kinds of tumors (benign or malignant) which are associated with neoangiogenesis and all kinds of inflammatory diseases associated with neoangiogenesis for example disorders of the arthritis type (rheumatoid arthritis, r
• MCI mild cognitive disorder
• Alzheimer's disease Lewy-Body dementia
• Parkinson's disease cerebrovascular dementia
• the invention further relates to a method for the treatment of mammals, including humans, which are suffering from one of the above mentioned illnesses.
• the method is characterized in that a therapeutically active and pharmacologically effective and tolerable amount of one or more of the compounds according to the invention is administered to the ill mammal.
• the invention further relates to a method for inhibiting PDE, particularly PDE2, comprising contacting said PDE with an effective amount of a compound according to the invention.
• the invention further relates to a method for inhibiting PDE, particularly PDE2, comprising administering a pharmacologically active and therapeutically effective and tolerable amount of at least one compound according to the invention to a mammal in need of such inhibition.
• the invention further relates to the compounds according to the invention for use in the treatment and/or prophylaxis of illnesses, especially the illnesses mentioned.
• the invention further relates to the compounds according to the invention having PDE, particularly PDE2, inhibitory activity.
• the invention also relates to the use of the compounds according to the invention for the production of pharmaceutical compositions which are employed for the treatment and/or prophylaxis of the illnesses mentioned.
• the invention also relates to the use of the compounds according to the invention for the production of pharmaceutical compositions which are employed for the treatment and/or prophylaxis of PDE-, particularly PDE2-, associated diseases.
• the invention furthermore relates to pharmaceutical compositions for the treatment and/or prophylaxis of the illnesses mentioned, which contain one or more of the compounds according to the invention.
• the invention moreover relates to pharmaceutical compositions having PDE, particularly PDE2, inhibitory activity.
• the invention relates to an article of manufacture, which comprises packaging material and a pharmaceutical agent contained within said packaging material, wherein the pharmaceutical agent is therapeutically effective for antagonizing the effects of the cyclic nucleotide phosphodiesterase of type 2 (PDE2), ameliorating the symptoms of an PDE2-mediated disorder, and wherein the packaging material comprises a label or package insert which indicates that the pharmaceutical agent is useful for preventing or treating PDE2-mediated disorders, and wherein said pharmaceutical agent comprises one or more compounds of formula 1 according to the invention.
• the packaging material, label and package insert otherwise parallel or resemble what is generally regarded as standard packaging material, labels and package inserts for pharmaceuticals having related utilities.
• compositions according to the invention may be performed in any of the generally accepted modes of administration available in the art.
• suitable modes of administration include intravenous, oral, nasal, parenteral, topical, transdermal and rectal delivery. Intravenous and oral delivery is preferred.
• compositions are prepared by processes which are known per se and familiar to the person skilled in the art.
• the compounds according to the invention are either employed as such, or preferably in combination with suitable pharmaceutical auxiliaries and/or excipients, e.g. in the form of tablets, coated tablets, capsules, caplets, suppositories, patches (e.g. as TTS), emulsions, suspensions, gels or solutions, the active compound content advantageously being between 0.1 and 95% and where, by the appropriate choice of the auxiliaries and/or excipients, a pharmaceutical administration form (e.g. a delayed release form or an enteric form) exactly suited to the active compound and/or to the desired onset of action can be achieved.
• suitable pharmaceutical auxiliaries and/or excipients e.g. in the form of tablets, coated tablets, capsules, caplets, suppositories, patches (e.g. as TTS), emulsions, suspensions, gels or solutions, the active compound content advantageously being between
• auxiliaries or excipients which are suitable for the desired pharmaceutical formulations on account of his/her expert knowledge.
• solvents for example antioxidants, dispersants, emulsifiers, preservatives, solubilizers, colorants, complexing agents or permeation promoters, can be used.
• the compounds according to the invention are preferably also administered by inhalation in the form of an aerosol; the aerosol particles of solid, liquid or mixed composition preferably having a diameter of 0.5 to 10 ⁇ m, advantageously of 2 to 6 ⁇ m.
• Aerosol generation can be carried out, for example, by pressure-driven jet atomizers or ultrasonic atomizers, but advantageously by propellant-driven metered aerosols or propellant-free administration of micronized active compounds from inhalation capsules.
• the administration forms additionally contain the required excipients, such as, for example, propellants (e.g. Frigen in the case of metered aerosols), surface-active substances, emulsifiers, stabilizers, preservatives, flavorings, fillers (e.g. lactose in the case of powder inhalers) or, if appropriate, further active compounds.
• propellants e.g. Frigen in the case of metered aerosols
• surface-active substances e.g. Frigen in the case of metered aerosols
• emulsifiers emulsifiers
• stabilizers emulsifiers
• preservatives e.g., emulsifiers, stabilizers, preservatives
• flavorings e.g. lactose in the case of powder inhalers
• fillers e.g. lactose in the case of powder inhalers
• the compounds according to the invention are in particular administered in the form of those pharmaceutical compositions which are suitable for topical application.
• suitable pharmaceutical formulations are, for example, powders, emulsions, suspensions, sprays, oils, ointments, fatty ointments, creams, pastes, gels or solutions.
• compositions according to the invention are prepared by processes known per se.
• the dosage of the active compounds is carried out in the order of magnitude customary for PDE inhibitors.
• Topical application forms (such as ointments) for the treatment of dermatoses thus contain the active compounds in a concentration of, for example, 0.1-99%.
• the dose for administration by inhalation is customarly between 0.1 and 3 mg per day.
• the customary dose in the case of systemic therapy (p.o. or i.v.) is between 0.03 and 3 mg/kg per day.
• PDE phosphodiesterase
• PCR polymerase chain reaction
• RT-PCR reverse transcription- polymerase chain reaction
• dNTPs deoxynucleoside triphosphates
• RNA ribonucleic acid
• cDNA complementary deoxyribonucleic acid
• bp basepairs
• (dT) 15 pentadecathymidylic acid
• ORF open reading frame
• GB no. GenBank database accession number
• rBV recombinant baculovirus
• wt wild type
• aa aminoacid
• UCR upstream conserved region
• PAA polyacrylamide.
• Aminoacids are abbreviated with the 1 -character symbol: A for alanine, C for cysteine, D for aspartic acid, E for glutamic acid, F for phenylalanine, G for glycine, H for histidine, I for isoleucine, K for lysine , L for leucine, M for methionine, N for asparagine, P for proline, Q for glutamine, R for arginine, S for serine, T for threonine, V for valine , W for tryptophane, Y for tyrosine.
• PCR was carried out in a Stratagene Robocycler 40 or in a MWG Primus 96 plus thermocycler. Typically, PCR was carried out with the Expand Lond Template PCR System from Roche in buffer 3 plus 0.75 mM MgCI 2 , 0.3 ⁇ M each primer, 500 ⁇ M dNTPs.
• PCR products were purified with the High Pure PCR Product Purification Kit (Roche) or from agarose gel with the QIAquick Gel Extraction kit from Qiagen, and cloned into the pCR2.1-TOPO vector from Invitrogen.
• the ORFs were subcloned in baculovirus expression vectors (transfer plasmids).
• the pCR- Bac and pVL vectors were from Invitrogen.
• the pBacPak vectors (pBP8 or pBP9) were from Clontech. Restriction endonucleases were from Roche and MBI Fermentas. Modifying enzymes and T4 DNA ligase were from New England Biolabs.
• the PDE2A3 (GB no. U67733) was amplified in 2 steps using PCR from brain cDNA.
• a N-terminal fragment was isolated using primers CP1 PD2AS (5'- GAGGAGTGATGGGGCAGGC -3') and PR9PD2AA ( 5'- GCGAAGTGGGAGACAGAAAAG -3'), a C-terminal fragment was isolated using primers PR7PD2AS (5'- GATCCTGAACATCCCTGACG -3') and CP3PD2AA (5'- GGGATCACTCAGCATCAAGGC-3').
• the PCR products were cloned into the vector pCR2.1-Topo.
• the N-terminal fragment was first subcloned with EcoRI into pBluescript Il KS (-), afterwards a Bst1107l/EcoRV fragment was exchanged with the corresponding restriction fragment from the C- terminal clone, to obtain a complete ORF.
• the ORF for the PDE2A3 was subcloned into pBP8 using Xbal and Kpnl.
• the rBV was prepared by means of homologous recombination in Sf9 insect cells.
• the expression plasmids were cotransfected with Bac-N-Blue (Invitrogen) or Baculo-Gold DNA (Pharmingen) using a standard protocol (Pharmingen).
• Wt virus-free recombinant virus supernatants were selected using plaque assay methods. After that, high-titre virus supernatants were prepared by amplifying 3 times.
• PDE2 was expressed in Sf21 cells by infecting 2x10 6 cells/ml with an MOI (multiplicity of infection) between 1 and 10 in serum-free SF900 medium (Life Technologies).
• Cells were cultured at 28°C , typically for 48 hours, after which they were pelleted for 5-10 min at 1000 g and 4°C. In spinner flasks, cells were cultured at a rotational speed of 75 rpm. The SF21 insect cells were resuspended, at a concentration of approx.
• the test volume is 100 ⁇ l and contains 20 mM Tris buffer (pH 7.4), 0.1 mg of BSA (bovine serum albumin)/ml, 5 mM Mg 2+ , 0.5 ⁇ M cAMP (including about 50,000 cpm of [3H]CAMP), 5 ⁇ M cGMP (to activate PDE2A3), 2 ⁇ l of the respective substance dilution in DMSO and sufficient recombinant PDE (1000xg supernatant, see above) to ensure that 15-20% of the cAMP is converted under the said experimental conditions.
• Tris buffer pH 7.4
• BSA bovine serum albumin
• 5 mM Mg 2+ 0.5 ⁇ M cAMP (including about 50,000 cpm of [3H]CAMP)
• 5 ⁇ M cGMP to activate PDE2A3
• the reaction is started by adding the substrate (cAMP) and the assays are incubated for a further 15 min; after that, they are stopped by adding SPA beads (50 ⁇ l).
• the SPA beads had previously been resuspended in water and then diluted 1 :3 (v/v); the diluted solution also contains 3 mM IBMX.
• the MTP's are analyzed in commercially available measuring appliances and the corresponding IC 50 values of the compounds for the inhibition of PDE activities are determined from the concentration-effect curves by means of non-linear regression.
• EBM endothelial cell basal medium
• FCS fetal calf serum
• HUVECs were cultured in EGM2 (1 OO ⁇ l in the upper wells and 600 ⁇ l in the lower wells) over four days prior the experiments and medium was changed every other day. At the day of the experiment culture medium was replaced by M199 with 1 % human serum albumin.
• Endothelial cells were preincubated with cyclic nucleotide modifiers (the selective PDE3 inhibitor motapizone, the selective PDE4 inhibitor RP73401 , the cGMP generators ANP or SNP and PDE2 inhibitors) for 15 min.
• HUVECs were then stimulated with Thrombin (1 U ml "1 ) (Sigma, Taufkichen, Germany) and horsh radish peroxidase (5 ⁇ g/ml) (Sigma, Taufmün, Germany) as the macromolecule marker protein was added to the upper wells.
• compounds according to the invention can inhibit Thrombin-induced permeability of HUVEC monolayers for horsh radish peroxidase (HRP) as a macromolecule marker. Therefore, PDE2 inhibitors are suggested to improve the endothelial barrier function, which is impaired in numerous conditions such as acute respiratory distress syndrome (ARDS) or severe pneumonia.
• ARDS acute respiratory distress syndrome
• the system to measure these cellular effects of the PDE2 inhibitors observed the enzymological characteristics of PDE2 which exhibits a rather high Km for cAMP and the activity of which is activated by cGMP.
• the Thrombin-induced increase of HRP permeability was completely abolished by complete inhibition of PDE3 (10 ⁇ M Motapizone) and PDE4 (1 ⁇ M RP73401).
• HUVEC cells on 3 ⁇ m polycarbonate filters were preincubated with 1 ⁇ M RP73401 (to block PDE4) and 10 ⁇ M Motapizone (to block PDE3), 1 mM SNP or 10OnM ANP and test sample over 15 min and then stimulated with 1 U/ml thrombin. HRP passage into the lower wells was assessed after 60 min. RP73401 and Motapizone completely blocked thrombin-induced hyperpermeability, which was partially reversed by SNP and ANP.
• Compounds according to this invention can inhibit the SNP- or ANP-induced permeability increase in a concentration-dependent fashion.
• Representative inhibitory values [measured as -log IC 50 (mol/l)] determined in the aforementioned assay follow from the following table B, in which the numbers of the compounds correspond to the numbers of the examples.

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