Trifluoroacetic anhydride → HCID 809626, compound

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Reaction Steps

Yield: 1.5 g of N-(4-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)phenyl)acetamide (65% of theory), oil obtained analogously from 2-(4-aminophenyl)-5-methyl-2,4-dihydro-3-pyrazolone and trifluoroacetic anhydride is N-(4-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)-phenyl)trifluoroacetamide from 2-(3-aminophenyl)-5-methyl-2,4-dihydro-3-pyrazolone and trifluoroacetic anhydride is N-(3-(4,5-dihydro-3-methy-5-oxo-1H-pyrazol-1-yl)-phenyl)trifluoroacetamide from 2-(3-aminophenyl)-5-methyl-2,4-dihydro-3-pyrazolone and acetic anhydride is N-(3-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)-phenyl)acetamide from 5-methyl-2-(4-aminophenyl)-2,4-dihydro-3-pyrazolone (prepared in analogy to Example 10) and acetic anhydride is N-(4-(4,5-dihydro-3-methyl-5-oxo-5H-pyrazol-1-yl)-phenyl)acetamide and by reaction with 2-ethylaniline N-(4-(4-(2-ethylanilinomethylene)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)phenyl)acetamide, m.p.: 230° C.

Provenance & Evidence