Cross reactions of cyanoacetic acid derivatives with carbonyl compounds 3. One-step synthesis of substituted 2-amino-5-oxo-4,5-dihydropyrano[3,2-c]chromenes
2005
Three-component reactions of 4-hydroxycoumarin, carbonyl compounds, and malono-nitrile or alkyl cyanoacetates in ethanol in the presence of Et3N as a catalyst give substituted 2-amino-5-oxo-4,5-dihydropyrano[3,2-c]chromenes.
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