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.
通过
4-羟基
香豆素与适当的胺反应,制备出 4-芳基和 4-烷基
氨基
香豆素 1。在 Vilsmeier-Haack 条件下,4-烷基
氨基
香豆素可生成 3-甲酰基衍
生物 3。