The invention relates to pyridazinone and pyridone com- pounds having formula (I) or (I'), and pharmaceutically acceptable salts, hydrates, and solvates thereof (I) wherein R1 / R4 and X and X3 are as defined in the claims
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Page/Page column 58
(2012/09/22)
Pyridazines with Heteroatom Substituents in Position 3 and 5. 3) 2-Aryl-5-hydroxypyridazin-3(2H)-ones as Potential Herbicides: Synthesis and Some Reactions
The coupling of dimethyl acetonedicarboxylate 1 with a variety of aryldiazonium salts 2a-i produces the hydrazones 3a-i which can be cyclized in boiling dichlorobenzene to yield the pyridazone esters 4a-i, or in sodium hydroxide solution to give the pyrid
Schober, Bernt D.,Megyeri, Gabor,Kappe, Thomas
p. 169 - 176
(2007/10/02)
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