A Novel Transformation of 4-Arylaminocoumarins to 6H-1-Benzopyranoquinolin-6-ones Under Vilsmeier-Haack Conditions

Article abstract of DOI:10.1055/s-1987-27930

4-Aryl and 4-alkylaminocoumarins 1 were prepared by reacting of 4-hydroxycoumarin and an appropriate amine.The reaction of 1 with phosphorousoxychloride/dimethylformamide led to 6H-1-benzopyrano<4,3-b>quinoline-6-one derivatives 2 in very good yields, whi