A Novel Transformation of 4-Arylaminocoumarins to 6<i>H</i>-1-Benzopyrano[4,3-b]quinolin-6-ones Under V ilsmeier-Haack Conditions
作者:K. Tabaković、I. Tabaković、N. Ajdini、O. Leci
DOI:10.1055/s-1987-27930
日期:——
4-Aryl and 4-alkylaminocoumarins 1 were prepared by reacting of 4-hydroxycoumarin and an appropriate amine. The reaction of 1 with phosphorusoxychloride/dimethylformamide led to 6 H-1-benzopyrano[4,3-b]quinoline-6-one derivatives 2 in very good yields, while 4-alkylaminocoumarins gave 3-formyl derivatives 3 under Vilsmeier-Haack conditions.