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.

中文翻译：

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使用哌啶和分子碘双催化剂体系合成含香豆素的 2,3-二氢-4(1H)-喹唑啉酮衍生物的有效方法

已开发出一种高效的哌啶和分子碘双催化剂体系，用于合成 2-烷基-2-(2-oxo-2H-chromen-3-yl)-2,3-dihydro-4(1H)quinazolinone 衍生物通过水杨醛、β-酮酯、乙酸铵和靛红酸酐的四组分反应。良好的收率、温和的反应条件和易于纯化是本方法的吸引人的特点。