Summary
Of the two methods of obtaining 7-methyl ethers of 5∶6∶7-hydroxy isoflavones partial methylation employing sodium bicarbonate is more convenient. Thus 7-methoxy-5∶6-dihydroxy and 7-methoxy-5∶6∶4′-trihydroxy isoflavones have been prepared. These could be partially acetylated, methylated in the 5-position and finally deacetylated to yield 5∶7-dimethoxy-6-hydroxy isoflavone and muningin respectively.
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Dhar, M.L., Seshadri, T.R. Synthetic experiments in the benzopyrone series. Proc. Indian Acad. Sci. 43, 79–83 (1956). https://doi.org/10.1007/BF03052752
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DOI: https://doi.org/10.1007/BF03052752