A mixture of α,β‐dicarbonyl substrates (1 mmol), semicarbazide
or thiosemicarbazide (1 mmol) and FeCl3@SiO2 (25
mg) in EtOH‐H2O (9:1, 5 mL) mixture as a solvent was refluxed.
After completion of the reaction, which was monitored with
TLC, the resulting mixture was filtered and the solid was
washed with EtOAc and H2O. The structures of the resulting
products were established on the basis of their 1H NMR, 13C
NMR, and CHN analysis.