Patent ES-8501765-A1 (ES)
Title: Substituted 6-aryl-1,2,4-triazolo[4,3-b]pyridazines, their preparation and use.
IPC: A61K31/41
Filed: 1984-03-29
Abstract: For the Contracting States : BE, CH, DE, FR, GB, IT, LI, LU, NL, SE 1. Compounds of the formula see diagramm : EP0121490,P11,F1 and salts thereof with a physiologically acceptable acid, in which formula R**1 and R**2 are identical or different and represent hydrogen, alkyl groups having 1-6 carbon atoms, phenyl or chlorine, R**3 denotes linear or branched alkyl having 1-6 carbon atoms, cycloalkyl having 3-8 carbon atoms, phenylalkyl which has 1-4 carbon atoms in the alkyl part and is optionally monosubstituted, disubstituted or trisubstituted in the phenyl part by fluorine, chlorine, bromine, iodine, trifluoromethyl or alkyl having 1-4 carbon atoms, alkylcarbonyl having 1-6 carbon atoms in the alkyl part, cycloalkylcarbonyl having 5-7 carbon atoms in the cycloalkyl part, or benzoyl which is optionally monosubstituted, disubstituted or trisubstituted by fluorine, chlorine, bromine, iodine, trifluoromethyl or alkyl having 1-4 carbon atoms, or denotes Ar, and in which Ar represents phenyl, phenoxyphenyl, phenylthiophenyl, 2-thienyl or 2-furyl, these radicals being optionally monosubstituted or disubstituted by fluorine, chlorine, alkyl groups having 1-6 carbon atoms, cyano or trifluoromethyl, with the exception of compounds of the formula I in which R**1 and R**2 denote hydrogen, R**3 denotes phenyl and Ar denotes phenyl or 4-methylphenyl. For the Contracting State AT 1. A process for the preparation of compounds of the formula I see diagramm : EP0121490,P13,F1 and salts thereof with a physiologically acceptable acid, in which formula R**1 and R**2 are identical or different and represent hydrogen, alkyl groups having 1-6 carbon atoms, phenyl or chlorine, R**3 denotes linear or branched alkyl having 1-6 carbon atoms, cycloalkyl having 3-8 carbon atoms, phenylalkyl which has 1-4 carbon atoms in the alkyl part and is optionally monosubstituted, disubstituted or trisubstituted in the phenyl part by fluorine, chlorine, bromine, iodine, trifluoromethyl or alkyl having 1-4 carbon atoms, alkylcarbonyl having 1-6 carbon atoms in the alkyl part, cycloalkylcarbonyl having 5-7 carbon atoms in the cycloalkyl part, or benzoyl which is optionally monosubstituted, disubstituted or trisubstituted by fluorine, chlorine, bromine, iodine, trifluoromethyl or alkyl having 1-4 carbon atoms, or denotes Ar, and in which Ar represents phenyl, phenoxyphenyl, phenylthiophenyl, 2-thienyl or 2-furyl, these radicals being optionally monosubstituted or disubstituted by fluorine, chlorine, alkyl groups having 1-6 carbon atoms, cyano or trifluoromethyl, with the exception of compounds of the formula I in which R**1 and R**2 denote hydrogen, R**3 denotes phenyl and Ar denotes phenyl or 4-methylphenyl, which comprises a) cyclizing a compound of the formula II see diagramm : EP0121490,P13,F2 in which Ar, R**1, R**2 and R**3 have the meanings indicated for formula I and Z represents O or S, by heating, if appropriate with the addition of a condensation agent, to give a compound of the formula I, or b) by reacting a compound of the formula III see diagramm : EP0121490,P13,F3 in which R**6 denotes chlorine, bromine or methylthio and Ar, R**1 and R**2 have the meanings indicated for formula I, with an amine of the formule IV see diagramm : EP0121490,P14,F4 in which R**3 has the meaning indicated for formula I, or c) reacting, if appropriate with the addition of a condensation agent or catalyst, a compound of the formula V see diagramm : EP0121490,P14,F5 or one of its salts in which Ar, R**1 and R**2 have the meanings indicated for formula I, with a compound of the formula VI R**3-Y in which R**3 has the meaning indicated for formula I and Y represents a leaving group, such as, for example, fluorine, chlorine, bromine, iodine, see diagramm : EP0121490,P14,F6 or the tosylate radical, and, if appropriate, converting a compound thus obtained into a salt thereof by adding a physiologically acceptable acid.