Summary
Using N-bromosuccinimide, a synthesis of 7∶7′-dihydroxychromeno-(3∶′∶4′∶2∶3) chromone has been effected. 7∶2′∶4′-Triacetoxy-2-methyl isoflavone is brominated to give the 2-bromomethyl isoflavone which is cyclized, after hydrolysis, to the corresponding chromenochromone.
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References
Seshadri and VaradarajanProc. Ind. Acad. Sci., 1953,37 A, 784.
Mitter and MaitraJour. Ind. Chem., Soc., 1936,13, 236.
King and NeillJour. Chem. Soc., 1952, 4752.
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Sehgal, J.M., Seshadri, T.R. Synthetic experiments in the benzopyrone series. Proc. Indian Acad. Sci. 42, 36–40 (1955). https://doi.org/10.1007/BF03053559
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DOI: https://doi.org/10.1007/BF03053559