Abstract
It was found that the condensation of two equivalents of 4-hydroxy-6-methyl-2H-pyran-2-one or 4-hydroxycoumarin with arylglyoxals in boiling formic acid leads to 4H-furo[3,2-c]-pyran-4-ones or 4H-furo[3,2-c]chromen-4-ones, respectively.
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Gorbunov, Y.O., Mityanov, V.S., Melekhina, V.G. et al. Synthesis of novel 4H-furo[3,2-c]pyran-4-ones and 4H-furo[3,2-c]chromen-4-ones. Russ Chem Bull 67, 304–307 (2018). https://doi.org/10.1007/s11172-018-2074-y
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DOI: https://doi.org/10.1007/s11172-018-2074-y