“DongChongXiaCao” (DCXC; winter-worm, summer-grass)
or Chinese caterpillar fungus, has been used as a tonic for the
weak in Chinese tradition and was honored as one of the three
greatest invigorants together with ginseng and pilose antlers [1].
Actually, DCXC is the complex of the fungus Cordyceps sinensis
(Berk.) Sacc(later reclassified as Ophiocordyceps sinensis) [2]
and the dead caterpillar larva of the moth Hepialus spp., which
was found at high altitudes on the Qinghai–Tibetan Plateau.
However, some other fungal species, namely, Cordycepscolonizing
fungi, were isolated from the stromata and sclerotia
of O. sinensis. It's still a puzzle whether these fungi make
contribution to the claimed medical benefits. We initiated
chemical investigations of these fungi and obtained numbers of
new bioactive natural products [3–5]. The strain Fimetariella sp.
(S207) was isolated from a sample of O. sinensis collected in
Kangding, Sichuan Province, P.R. China. Our prior investigation
of this strain has resulted in the isolation of fimetarone A
with the new spiro[chroman-3,7′-isochromene]-4,6′(8′H)-dione
skeleton, which showed modest cytotoxicity against T24 cells
[5]. Since its HPLC fingerprint revealed the presence of many
other components, the fungus was fermented in a larger scale on
rice. Its organic extract afforded five new 4H-chromen-4-one
derivatives coniochaetones E–I (1–5), along with two known
metabolites coniochaetones B (6) and A (7). Details of the
isolation, structure elucidation and cytotoxicity evaluation of
these compounds are reported herein.
“DongChongXiaCao” (DCXC; winter-worm, summer-grass)or Chinese caterpillar fungus, has been used as a tonic for theweak in Chinese tradition and was honored as one of the threegreatest invigorants together with ginseng and pilose antlers [1].Actually, DCXC is the complex of the fungus Cordyceps sinensis(Berk.) Sacc(later reclassified as Ophiocordyceps sinensis) [2]and the dead caterpillar larva of the moth Hepialus spp., whichwas found at high altitudes on the Qinghai–Tibetan Plateau.However, some other fungal species, namely, Cordycepscolonizingfungi, were isolated from the stromata and sclerotiaof O. sinensis. It's still a puzzle whether these fungi makecontribution to the claimed medical benefits. We initiatedchemical investigations of these fungi and obtained numbers ofnew bioactive natural products [3–5]. The strain Fimetariella sp.(S207) was isolated from a sample of O. sinensis collected inKangding, Sichuan Province, P.R. China. Our prior investigationof this strain has resulted in the isolation of fimetarone Awith the new spiro[chroman-3,7′-isochromene]-4,6′(8′H)-dioneskeleton, which showed modest cytotoxicity against T24 cells[5]. Since its HPLC fingerprint revealed the presence of manyother components, the fungus was fermented in a larger scale onrice. Its organic extract afforded five new 4H-chromen-4-onederivatives coniochaetones E–I (1–5), along with two knownmetabolites coniochaetones B (6) and A (7). Details of theisolation, structure elucidation and cytotoxicity evaluation ofthese compounds are reported herein.
การแปล กรุณารอสักครู่..
