IR spectra were recorded on IRPrestige-21, Shimadzu FTIR spectrophotometer. 1 HNMR spectra were obtained on a Avance Bruker-400MHz spectrometer and 13 C NMR were obtained on a Avance Bruker-75MHz spectrometer., Samples were analysed in CDCl 3 and the chemical shift
The title compounds (IV) are obtained by a solvent‐free three‐component condensation reaction between various aromatic aldehydes, ethyl acetoacetate, and urea/thiourea.
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