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• W2000991562 abstract "The synthesis of 3-substituted and 3,4-disubstituted pyrazolin-5-ones from acylated ethyl acetoacetates and diethyl malonates is described. The reaction of acylated ethyl acetoacetates and diethyl acetylmalonate with hydrazine (98%) gave 3-substituted pyrazolin-5-ones and malonyldihydrazide, respectively, following a deacetylation–condensation sequence. The reaction of ethyl 2-acetyl-3-hydroxy-2-butenoate and diethyl 2-(1-hydroxyethylidene)malonate with hydrazine monohydrochloride yielded ethyl 3,5-dimethyl-1H-pyrazole-4-carboxylate and 4-ethoxycarbonyl-3-methylpyrazolin-5-one, respectively, following a dehydration–cyclocondensation sequence, in high yields." @default.
• W2000991562 created "2016-06-24" @default.
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• W2000991562 date "2002-04-01" @default.
• W2000991562 modified "2023-10-17" @default.
• W2000991562 title "Synthesis of 3-substituted and 3,4-disubstituted pyrazolin-5-ones" @default.
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• W2000991562 doi "https://doi.org/10.1016/s0040-4020(02)00306-x" @default.
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