Polyketides from Eleutherine bulbosa

Abstract

Four new polyketides, (R)-4-hydroxyeleutherin, eleuthone, eleutherinol-8-O-β-D-glucoside and isoeleuthoside C (dihydroisoeleutherin-5-O-β-D-gentiobioside) were isolated from the bulbs of Eleutherine bulbosa, to join eleutherin, isoeleutherin, eleutherinol, eleutherol, eleuthoside B (eleutherol-4-O-β-D-gentiobioside), eleuthoside C (dihydroeleutherin-5-O-β-D-gentiobioside), hongconin (4-oxodihydroisoeleutherin) and elecanacin, which have already been isolated from the same plant. The structures of the new polyketides, based on oxydated cyclic systems, have been elucidated by chemical and spectroscopic methods.

Keywords:

• Eleutherine bulbosa
• Iridaceae
• polyketides
• (R)-4-Hydroxyeleutherin
• eleuthone
• eleutherinol-8-O-β-D-glucoside
• isoeleuthoside C (dihydroisoeleutherin-5-O-β-D-gentiobioside)

Acknowledgements

The authors thank Prof. Franco Delle Monache (CNR, Centro Chimica dei Recettori, Università Cattolica S. Cuore, Rome, Italy) for his NMR support.