New bitter-tasting hemiterpene glycosides from the Japanese fern Hymenophyllum barbatum.

نویسندگان

  • M Toyota
  • Y Oiso
  • Y Asakawa
چکیده

Hymenosides G--J were newly isolated from the Japanese fern Hymenophyllum barbatum, in addition to hymenosides A--F. The structures of hymenosides were elucidated by extensive two-dimensional nuclear magnetic resonance and/or chemical evidence. The structures of those aglycones were divided into three types, 1,4-dihydroxy-2-hydroxymethyl-but-2-ene, 1,4-dihydroxy-2-methyl-but-2-ene, and 3-hydroxy-5-hexanolide. The sugar moieties were also established by chemical and spectroscopic methods, which were acylated by phenylacetic acid derivatives. These glycosides had a bitter or weakly pungent taste.

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عنوان ژورنال:
  • Chemical & pharmaceutical bulletin

دوره 49 12  شماره 

صفحات  -

تاریخ انتشار 2001