An efficient dual-catalyst system of piperidine and molecular iodine has been developed for the synthesis of 2-alkyl-2-(2-oxo-2H-chromen-3-yl)-2,3-dihydro-4(1H)quinazolinone derivatives by a four-component reaction of salicylaldehydes, β-keto esters, ammonium acetate, and isatoic anhydride. Good yields, mild reaction conditions, and easy purification are attractive features of the present method.
Key words
salicylaldehyde - β-keto ester - isatoic anhydride - ammonium acetate - 2-alkyl-2-(2-oxo-2
H-chromen-3-yl)-2,3-dihydro-4(1
H)quinazolinone - dual-catalyst system