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
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Abstract
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.
Key words
malononitrile alkyl cyanoacetates 4-hydroxycoumarin 2-amino-5-oxo-4,5-dihydropyrano[3,2-c]chromenes spiro[indoline-3,4′]pyrano[3,2-c]chromenes cross reactions 6-amino-2,1′-bis(benzyloxycarbonyl)-5,7,7-tricyanospiro[3,7,8,8a-tetrahydro-1H-isoquinoline-8,4′-piperidine]Preview
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