The Diels–Alder reaction of a 6-alkoxy-2-pyrone (6) with quinones (3a–c) has been investigated as a synthetic approach to the aclacinomycin and pyrromycin antibiotics (2a and b) and has resulted in efficient total syntheses of chrysophanol (7a), helminthosporin (7b), and pachybasin (7c).
M. E. Jung and J. A. Lowe, J. Chem. Soc., Chem. Commun., 1978, 95 DOI: 10.1039/C39780000095
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