Scheme 1
Reagents and conditions (
i
) dimethylformamide, phosphoryl chloride, NaOH, water, stirring (
ii
) ArCOCH3, ethanol, 40% NaOH, stir and kept for 24 hrs at room temperature (
iii
) 2-aminothiophenol, zirconyl chloride, microwave irradiation.
