ABSTRUCT: n-Hexane extract of rhizomes of Imperata cylindrica var. koenigii f. pallida yielded five novel skeletal triterpenoids, designed as impallidin (1), impallidol (2), impallidin ozonide (3a, 3b), trisnorimpallidin aldehyde (4), tetranorimpallidin aldehyde (5). Structures of novel compounds were elucidated by mainly 2D NMR and other spectroscopic analysis and chemical correlations. Alternatively, compound 3a, 3b was derivatized from 1 under ozone oxidation condition.
Keywords: Chemotaxonomy; Imperata rhizomes; Nor-triterpenoid; Structure determination; Triterpenoid.
© 2023. The Author(s) under exclusive licence to The Japanese Society of Pharmacognosy.