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Synthesis 1987; 1987(3): 308-310
DOI: 10.1055/s-1987-27930
DOI: 10.1055/s-1987-27930
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A Novel Transformation of 4-Arylaminocoumarins to 6 H-1-Benzopyrano[4,3-b]quinolin-6-ones Under V ilsmeier-Haack Conditions
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Publication History
Publication Date:
12 September 2002 (online)
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.