title: Reactions of hydroxybenzofurans. VI. Syntheses of benzofuran chalcones, hydrazones and pyrazolines of potential biological activity.
abstract: Condensation of 5-acetyl-6-methoxy- (I) and 6-acetyl-5-methoxy-2,3-diphenylbenzofuran (II) with aromatic aldehydes gave the chalcones IIIa--f and IVa--f, respectively. Reaction of the chalcones IIIa--f and IVa--f with hydrazine hydrate-acetic acid mixture yielded the corresponding N-acetyl pyrazolines Va--f and VIa--f. The chalcones IIIa--f and IVa--f reacted with phenylhydrazine in ethanol to yield the corresponding phenylhydrazones VIIa--f and VIIIa--f. The latter hydrazones cyclize easily with boiling glacial acetic acid to the corresponding pyrazoline derivatives (IXa--f and Xa--f). The antibacterial activity of the chalcones and pyrazolines was investigated.
mesh_terms: D001419:Bacteria / Q000187:drug effects; D001572:Benzofurans / Q000138:chemical synthesis* / Q000494:pharmacology; D002599:Chalcone / Q000031:analogs & derivatives / Q000138:chemical synthesis* / Q000494:pharmacology; D006835:Hydrazones / Q000138:chemical synthesis* / Q000494:pharmacology; D011427:Propiophenones / Q000138:chemical synthesis*; D011720:Pyrazoles / Q000138:chemical synthesis* / Q000494:pharmacology
chemical_list: D001572:Benzofurans; D006835:Hydrazones; D011427:Propiophenones; D011720:Pyrazoles; D002599:Chalcone