Stereostructure of Excoecarin H, a Novel seco-Labdane-Type Diterpene from Excoecaria agallocha.
نویسندگان
چکیده
منابع مشابه
A new atisane-type diterpene from the bark of the mangrove plant Excoecaria agallocha.
A new atisane-type diterpene, ent-16alpha-hydroxy-atisane-3,4-lactone (4) and three known diterpenes, ent-16alpha-hydroxy-atisane-3-one (1), ent-atisane-3beta,16alpha-diol (2), ent-3,4-seco-16alpha-hydroxyatis- 4(19)-en -3-oic acid (3) were isolated from the bark of the mangrove plant Excoecaria agallocha. Their structures and relative stereochemistry were elucidated by means of extensive NMR a...
متن کاملStereostructures of New Labdane-Type Diterpenes, Excoecarins F, G1, and G2 from the Wood of Excoecaria agallocha
Excoecaria agallocha LINN (Euphorbiaceae) is distributed on seashores and edge-mangroves throughout tropical Africa, Asia, and northwest Australia. The Excoecaria genus is well known to contain skin irritants, generally called irritant Excoecaria factors. The bark and wood of this tree have been used in traditional medicines for flatulence in Thailand. The resinous wood including the latex of E...
متن کاملAnti-tumor-promoting activity of the diterpene from Excoecaria agallocha. II.
Eight new diterpenoids (1-8) have been isolated from the wood of Excoecaria agallocha (Euphorbiaceae) and their inhibitory effects on the induction of Epstein-Barr virus early antigen (EBV-EA) in Raji cells were examined to search for potent anti-tumor-promoters from natural resources. Of these compounds, the secolabdane-type diterpenoid, compound 7 exhibited a remarkable inhibitory effect on E...
متن کاملA new labdane diterpene from Vitex negundo.
CONTEXT Vitex negundo Linn. (Verbenaceae) seeds are pepper substitute and occasionally used as a condiment for edible purposes. The seeds also find use for analgesia, sedation, rheumatism and joint inflammation in folk medicine. OBJECTIVE To isolate and characterize bioactive constituents from V. negundo seeds. MATERIALS AND METHODS The ethanol extract of V. negundo seeds was subjected to r...
متن کاملA new labdane diterpene from the flowers of Solidago canadensis.
A new labdane diterpene, 9alpha,16xi-dihydroxy-6-oxo-7,13-labdadien-15,16-olide (solicanolide, 1) and six known compounds identified as quercetin (2), 3-O-caffeoylquinic acid (3, neochlorogenic acid), 5-O-caffeoylquinic acid (4, chlorogenic acid), 4,5-di-O-caffeoylquinic acid (5), 3,5-di-O-caffeoylquinic acid (6) and 3,4-di-O-caffeoylquinic acid (7) were isolated from the flowers of Solidago ca...
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ژورنال
عنوان ژورنال: Chemical and Pharmaceutical Bulletin
سال: 1998
ISSN: 0009-2363,1347-5223
DOI: 10.1248/cpb.46.721