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- W2951113575 abstract "Pentane-2,4-dione and 3-ethoxycarbonylcoumarin react in the presence of sodium ethoxide to form 10-acetyl-7,9-dihydroxy-6 H-benzo[ c]chromen-6-one (2). Compound 2 reacted with aromatic aldehydes and ethyl cyanoacetate to give the chromeno-chromenediones 3 and 4 respectively, with hydrazine hydrate to form the azine 5, with phenyl hydrazine giving the chromeno-indazole 6, with primary amines to form the imines 7a–f, and with thiourea to give the chromeno-quinazoline 8. Methyl 2-amino-4-(4-methoxyphenyl)-5-oxo-4,5-dihydro-pyrano[3,2- c]chromene-3-carboxylate (9a) and the corresponding 3-carbonitrile 9b were prepared, and the reactions of the ester 9a with phenacyl chloride, furoyl chloride, and hydrazine hydrate were investigated." @default.
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- W2951113575 date "2009-01-01" @default.
- W2951113575 modified "2023-09-26" @default.
- W2951113575 title "Heteroannulation of chromene derivatives. Synthesis of chromeno[4,3-e] indazolone chromeno[4,3-f]quinazoline and pyrano[3,2-c]chromene derivatives" @default.
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- W2951113575 doi "https://doi.org/10.3184/030823409x393727" @default.
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