Hoogianal, a beta-irone precursor from Iris hoogiana DYKES (Iridaceae)

摘要

Fractionation of the lipid extract from rhizomes of Iris hoogiana Dykes resulted in the isolation of one new and several known iridals. The latter were identified by comparison with authentic standards as 1-5. The structure of the new natural product, hoogianal (11), was elucidated by spectroscopic analysis. Oxidative degradation yielded beta -irone (10), identified by GC- and LC-MS. The (-)-(2S)-configuration of this oxidation product was determined by enantioselective GC on a chiral cyclodextrin phase and by comparison with the corresponding ketones in laeyo- and dextrorotatory commercial Iris oils. [References: 10]