- CYCLOARTANES AND OTHER TERPENOIDS AND PHENYLPROPANOIDS FROM MONOCYCLANTHUS VIGNEI
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From the petrol extract of the stem bark of Monocyclanthus vignei 30 terpenoids and two phenylpropanoids have been isolated and their structures established, among them 17 new cycloartane-type compounds.Geranic acid and β-caryophyllene were found to be the major constituents. Key words: Monocyclanthus vignei; Annonaceae; stem bark; cycloartanes; sterols; sesquiterpenes; geranic acid; phenylpropanoids.
- Achenbach, Hans,Frey, Dieter
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- BUXUS ALKALOIDS. PART XI. THE SYNTHESIS OF CYCLOPROTOBUXINE-A (3β,20S-CHIRALITY) AND ITS TWO ISOMERIC ALKALOIDS WITH 3β,20R- AND 3α,20R- CONFIGURATION FROM LANOSTEROL.
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The synthesis of cycloprotobuxine-A (5), representative of Buxus alkaloids, and its two isomeric alkaloids with 3β,20R- and 3α,20R-configuration, from lanosterol, is described.In order to confirm the stereochemistries at C-3 and C-20 in these three alkaloids, the 3β-dimethylamino-(27) and the 3α-dimethylamino derivative (28) of cycloartanol (24) were also synthesised and their 1H and 13C n.m.r.spectra are discussed.
- Nakano, Tatsuhiko,Martin, Alfonso,Alonso, Miguel
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p. 2957 - 2968
(2007/10/02)
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- FERN CONSTITUENTS: TRITERPENOIDS ISOLATED FROM POLYPODIUM VULGARE, P. FAURIEI AND P. VIRGINIANUM
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Key Word Index - Polypodium vulgare; P. fauriei; P. virginianum; Polypodiaceae; rhizomes; hop-22(29)-ene; isohop-22(29)-ene; fernenes; serrat-14-ene; dammaradienes; eupha-7,21-diene; cycloartanoid; cyclopodmenyl acetate.The fresh rhizomes of Polypodium vulgare, P. fauriei and P. virginianum collected in Japan gave, in addition to 30 known compounds, three new triterpenoids; dammara-17,21-diene, cyclopodmenyl acetate and 21αH-hopan-22-ol, The structures were elucidated by their physical data and chemical correlations.
- Arai, Yoko,Yamaide, Motoko,Yamazaki, Sachiko,Ageta, Hiroyuki
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p. 3369 - 3377
(2007/10/02)
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- New Triterpenes from Swietenia mahagoni Linn: Part V - Scission of C10-C19 Bond of Cyclopropane Ring in Cycloartenol
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A successful method is described for the first time to open the cyclopropane ring of cycloartenol (III) to yield 9β-hydroxymethyl derivative (X), in an attempt to establish the biogenetic origin of 9β-hydroxymethyl in cucurbitacins (I).Cycloartanone (VI) is first converted into cycl-1-en-3-one (IV), which rearranges in presence of ethanol-sulphuric acid to yield 9β-hydroxymethyllanosta-1(10)-en-3-one (X).
- Narayana, V. Lakshmi,Murthy, Y. L. N.,Row, L. R.
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p. 977 - 978
(2007/10/02)
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