New bitter-tasting hemiterpene glycosides from the Japanese fern Hymenophyllum barbatum.
نویسندگان
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.
منابع مشابه
Hymenosides A-F, six new hemiterpene glucosides from the Japanese fern Hymenophyllum barbatum.
In the course of investigation of the bitter-tasting substances of the Japanese fern Hymenophyllum barbatum belonging to the family Hymenophyllaceae, six new hemiterpene glucosides called hymenosides A-F (1-6) have been isolated from the methanol extract, together with an acyclic bis-bibenzyl derivative, perrottetin H. This paper deals with the structure elucidation of the newly isolated glucos...
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ورودعنوان ژورنال:
- Chemical & pharmaceutical bulletin
دوره 49 12 شماره
صفحات -
تاریخ انتشار 2001