Production of pyridazinone compound
专利汇可以提供Production of pyridazinone compound专利检索，专利查询，专利分析的服务。并且PURPOSE: To obtain a pyridazinone compound useful as a drug industrially and advantageously, by efficiently introducing a double bond to the 4 and 5 positions of pyridazinone ring under a mild condition by a reaction with an acid in the presence or absence of a sulfoxide compound.
CONSTITUTION: A compound shown by formula I (ring A is benzene ring or thiophene ring; R
1 and R
2 are H, halogen, CF
3 , OH, NH
2 , NO
2 , CN, lower alkyl, etc.; R
3 is H, 1-8C alkyl, hydroxyalkyl, alkanoyloxyalkyl, aryl which may contain substituent group such as halogen on aromatic ring; x is O, S, SO, SO
2 CH
2 , etc.; n is 1 or 2) is reacted with an acid such as methanesulfonic acid optionally in the presence of a sulfoxide compound such as dimethyl sulfoxide to advantageously give the objective compound shown by formula II having pharmaceutical action such as anoxiolytic action, biophylaxis sthenic action, etc., without admixture of brominated by-products as existing oxidation method with bromine.
COPYRIGHT: (C)1992,JPO&Japio，下面是Production of pyridazinone compound专利的具体信息内容。
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