Studies on the Metabolic Products of Macrosporium Porri Elliott

Part IV. Structure of Macrosporin (Group III)

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Macrosporin monomethylether was synthesized by means of condensation between α-resorcylic acid (I) and 3-methoxy-p-toluic acid (II) with the use of conc. sulfuric acid and boric anhydride.
From this result macrosporin C₁₆H₁₂O₅, a metabolic product of Macrosporium porri Elliott, was established to be 3, 5-dihydroxy-7-methoxy-2-methyl anthraquinone (A).