The structure of the ring system and the position of six of the seven oxygen functions in deoxyerythrostominone have been confirmed by the total synthesis of (±)-2-acetonyl-3,4-dihydro-6,8-dimethoxy-2H-naphtho[2,3-b]- pyran-5,10-quinone (20). Compound (20) has also been obtained by methylation of a hydrogenation product of erythrostominone.
B. E. Cross and L. J. Zammitt, J. Chem. Soc., Perkin Trans. 1, 1975, 1936 DOI: 10.1039/P19750001936
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