Exemplified by a synthesis of di-O-methylcitromycin, a method is described for the synthesis of derivatives of pyrano[3,2-c][1]benzopyran from the appropriate derivatives of chroman-4-one and 3-acetylchroman-4-one.
F. M. Dean, S. Murray and W. Taylor, J. Chem. Soc., Chem. Commun., 1974, 440 DOI: 10.1039/C39740000440
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