One-pot three component condensation reactions of methyl acetoacetate,hydroxylamine hydro-chloride and aromatic aldehydes were used for the preparation of a series of 3-methyl-4-arylmethylene-isoxazol-5(4H)-one derivatives under ultrasonic irradiation in aqueous media at room temperature.

A series of 4-arylmethylidene-3-methyl-4,5-dihydroisoxazol-5-one derivatives were synthe-sized by the condensation reactions of aromatic aldehydes with 3-methyl-4,5-dihydroisoxazol-5-one via room temperature grinding or heating under solvent-free conditions without any catalyst.

Study on the spectral characteristics of 4-arylidene-2-phenyl-1H-imidazol-5(4H)-ketone derivatives

A series of 5-arylmethylidene-2-thio-4-thiazolidinones were synthesized by the condensation reaction of aromatic aldehydes with 2-thio-4-thiazolidinone in a boiling water bath for 30～75 min with alkaline ionic liquids bmimOH as dual solvent and catalyst in yields from 89% to 96% and identified by 1H NMR and IR spectra.