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- W2022207824 abstract "Ring Transformations of 1-Oxa-5,6-diazaspiro[2.4]hept-6-en-4-ones into 4,5-Dihydro-4-hydroxy-1H-pyrazole-4-carboxylic Acid Derivatives Spiro epoxides 3 were synthesized from 1H-pyrazol-5(4H)-ones 1 by Knoevenagel condensation with acetone or benzaldehyde and subsequent epoxidation of 2 with hydrogen peroxide. 3 reacts with nucleophiles under ring transformation to 4,5-dihydro-4-hydroxy-1H-pyrazole-4-carboxylic acid derivatives 5. In three cases the intermediate 6 was isolated. 5b, c undergo by dehydrogenation with chloranil rearrangement to 4,5-dihydro-4-oxo-1H-pyrazole-5-carboxylic acid derivatives 7b, c." @default.
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- W2022207824 date "1994-02-14" @default.
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- W2022207824 title "Ringtransformationen von 1-Oxa-5,6-diazaspiro[2.4]hept-6-en-4-onen zu 4,5-Dihydro-4-hydroxy-1H-pyrazol-4-carbonsäure-Derivaten" @default.
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