Patent GR-860801-B (GR)
Title: Method for the preparation of novel pyridazinone
Inventor: NORBERT HAUEL DR
IPC: C07D401/14
Filed: 1986-03-26
Abstract: 1. Pyridazinones of general formula I  see diagramm : EP0196005,P30,F1  wherein X represents an oxygen or sulphur atom, R1 represents a saturated 5- to 7-membered alkyleneimino ring bonded via a nitrogen atom or a 5- to 7-membered saturated imino, N-alkylimino, N-phenylalkylimino, N-alkanoylimino or N-alkoxycarbonyliminoalkylene ring bonded via a carbon atom, whilst the above-mentioned rings may be substituted by one or two alkyl groups in the carbon structure and a methylene group in the 4-position of a 6- or 7-membered ring may be replaced by an oxygen or sulphur atom or by a sulphinyl, sulphonyl, imino, alkylimino, phenylalkylimino, alkoxycarbonylimino or alkanoylimino group, or R1 represents a saturated 5- to 7-membered alkyleneimino ring (optionally substituted by one or two alkyl groups) bonded via a nitrogen atom and in which a -CH2 CH2 - group is replaced by an -NH-CO group, the -CO- group in this -NH-CO- group being linked to the N-atom already present, or R1 represents a 5-membered heteroaromatic ring bonded via a nitrogen atom, which may additionally contain an oxygen or sulphur atom, one or two nitrogen atoms, or an oxygen or sulphur atom and a nitrogen atom and in which the heteroaromatic ring may be substituted by one or two alkyl groups, or in the case of a pyrazole, may alternatively be substituted by a hydroxy and an alkyl group, or R1 represents a 5- or 6-membered heteroaromatic ring bonded via a carbon atom, in which the heteroaromatic ring may contain an oxygen or sulphur atom, one, two or three nitrogen atoms, or an oxygen or sulphur atom and one or two nitrogen atoms, whilst the heteroaromatic rings may be substituted by one or two alkyl groups, by an amino or alkanoylamino group or, in the case of a pyridine, by one or two halogen atoms or by a halogen atom and an amino or morpholino group, and R2 represents a hydrogen atom or an alkyl group ; or X represents an imino group optionally substituted by an alkyl or phenylalkyl group, R1 represents a saturated 5- to 7-membered alkyleneimino ring bonded via a nitrogen atom or a 5- to 7-membered saturated imino, N-alkylimino, N-phenylalkylimino, N-alkanoylimino or N-alkoxycarbonyliminoalkylene ring bonded via a carbon atom, whilst the above-mentioned rings may be substituted by one or two alkyl groups in the carbon structure and a methylene group in the 4-position of a 6- or 7-membered ring may be replaced by an oxygen or sulphur atom or by a sulphinyl, sulphonyl, imino, alkylimino, phenylalkylimino, alkoxycarbonylimino or alkanoylimino group, or R1 represents a saturated 5- to 7-membered alkyleneimino ring (optionally substituted by one or two alkyl groups) bonded via a nitrogen atom and in which a -CH2 CH2 - groups is replaced by an -NH-CO group, the -CO- group in this -NH-CO- group being linked to the N-atom already present, and R2 represents a hydrogen atom or an alkyl group, whilst all the above-mentioned alkyl, alkanoyl or alkoxy groups may contain from 1 to 3 carbon atoms ; or X represents an imino group, R1 represents a 1-imidazolyl, 1-pyrazolyl, 3-methyl-1-pyrazolyl, 3-hydroxy-4-methyl-2-pyrazolyl or 1-[1.2.4]triazolyl group and R2 represents a methyl group in the 5-position ; or X represents an imino group, R1 represents a 2-chloro-6-morpholino-4-pyridyl group and R2 represents a hydrogen atom the optically active antipodes thereof, if R2 does not represent hydrogen, and the acid addition salts thereof.