Crystal structure of ent-(16R,17R)-17-hydroxy-17-methoxykauran-19-oic acid, C21H34O4
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چکیده
منابع مشابه
Crystal and molecular structure of (-)-17-hydroxy-neo-clerod-3-en-15-oic acid from Gymnosperma glutinosum.
structure elucidation of two new diterpenes from Gymnosperma glutinosum.1 The chemical structure of the neo-clerodane compound was established on the basis of 1H and 13C nmr spectroscopic studies and chemical reactions, but the stereochemistry at C-13 could not be determined. Therefore we carried out an X-ray crystal analysis of (–)-17-hydroxy-neoclerod-3-en-15-oic acid (Fig. 1) in order to obt...
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Bioassay-guided fractionation and purification of the anti-HIV-1-active MeOH extract from the leaves and twigs of Polyalthia sclerophylla led to the isolation of two new compounds, ENT-kaur-sclerodimer ( 1) and cyclotucanol 3-palmitate ( 2), along with the known ENT-kaur-16-en-19-oic acid ( 3), 15 beta-hydroxy- ENT-kaur-16-en-19-oic acid ( 4), 15 beta-acetoxy- ENT-kaur-16-en-19-oic acid ( 5), 1...
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In the title compound, C25H36O6, the two central cyclo-hexane rings exhibit a chair conformation. The terminal cyclo-hexene and cyclo-pentane rings are in half-chair and envelope conformations (with the C atom bearing the methyl substit-uent as the flap), respectively. The methyl group of the butyrate chain is disordered over two orientations, with a refined occupancy ratio of 0.742 (6):0.258 (...
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Two new ent-kauren-19-oic acid derivatives, ent-14S*-hydroxykaur-16-en-19-oic acid and ent-14S*,17–dihydroxykaur-15-en-19-oic acid together with eleven known compounds entkaur-16-en-19-oic acid, ent-kaur-16-en-19-al, ent-12β-hydroxykaur-16-en-19-oic acid, ent12β-acetoxykaur-16-en-19-oic acid, 8R,13R-epoxylabd-14-ene, eudesm-4(15)-ene-1β,6αdiol, (–)-7-epivaleran-4-one, germacra-4(15),5E, 10(14)-...
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ژورنال
عنوان ژورنال: Zeitschrift für Kristallographie - New Crystal Structures
سال: 2004
ISSN: 2197-4578,1433-7266
DOI: 10.1524/ncrs.2004.219.14.305