Studies on the constituents of orchidaceous plants. IX. Constituents of Spiranthes sinensis (Pers.) Ames var. amoena (M. Bieberson) Hara. (2). Structures of spiranthesol, spiranthoquinone, spiranthol-C, and spirasineol-B, new isopentenyldihydrophenanthrenes.
作者:Yasuhiro TEZUKA、Li JI、Hiroyuki HIRANO、Midori UEDA、Keiko NAGASHIMA、Tohru KIKUCHI
DOI:10.1248/cpb.38.629
日期:——
Four new dihydrophenanthrene derivatives, spiranthesol, spiranthoquinone, spiranthol-C, and spirasineol-B, were isolated from the roots of Spiranthes sinensis (PERS.) AMES var. amoena (M. BIEBERSON) HARA (Japanese name "nezibana"). The structures 1, 2, 3, and 4 were proposed for these compounds, respectively, on the basis of spectroscopic data obtained by various methods including 1H-detected heteronuclear multiple-bond multiple-quantum coherence (HMBC) spectroscopy. Chemical conversions of spiranthol-A to spiranthol-C and spiranthoquinone and of spirasineol-A-to spirasineol-B are also described.