KEYWORDSThe reactivity of hydrogen atoms at C-4 of pyrazolone 3 towards condensation reactions was studied by its reaction with p-anisaldehyde, malononitrile and/or ethyl acetoacetate in the presence of ammonium acetate and/or piperidine, glucose, phenyl isothiocyanate, 2-amino thiazole and aniline to afford compounds 4-6, 13, 15, 17 and 18, respectively. Reaction of amino carbonitrile 4 with ammonium thiocyanate, and formamide afforded compound 7 and pyrazolo [3,4-b]

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Die Michael‐Addition von Phenylessigsäureethylester (I) an die Benzylidenacetophenone (II) liefert die Ketoester (III), die thermisch mit (II) zu den Dihydropyranonen (IV) cyclisieren.

Aus den Chalkonen (I), die nach bekannten Verfahren hergestellt werden, erhält man mit den Malondiamiden (II) die Addukte (III), wobei die substituierten Malonamide langsamer als Malonamid direkt reagieren.

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