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Drychampones A–C: Three Meroterpenoids from <i>Dryopteris championii</i>
Three novel sesquiterpenoid-based
meroterpenoids, drychampones
A–C (<b>1</b>–<b>3</b>, respectively), were
isolated from <i>Dryopteris championii</i>. Compounds <b>1</b> and <b>3</b> possessed a novel carbon skeleton which
was constructed by an 11/6/6 ring system coupled with a pyronone moiety,
and <b>1</b>–<b>3</b> were three racemates. Their
structures and absolute configurations were elucidated by NMR, MS,
and computational methods. The hypothetical biosynthetic pathways
of these meroterpenoids and their antibacterial activities were also
discussed