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1α,6β,7β,11α,15β-Penta-hydr-oxy-7α,20-ep-oxy-ent-kaur-16-ene.

ABSTRACT: The title compound, C(20)H(30)O(6), a natural ent-kaurane diterpenoid, named nervosanin B, was obtained from the medicinal plant Isodon serra. It is composed of four rings with the expected trans and cis junctions. One of the six-membered rings is in a chair conformation, the other two are in boat conformations and the five-membered ring adopts an evenlope conformation. The mol-ecules stack along the a axis and are linked together by inter-molecular O-H⋯O hydrogen bonds. Two intramolecular O-H⋯O interactions also occur.

SUBMITTER: Feng C

PROVIDER: S-EPMC2979982 | biostudies-literature | 2010 Jan

REPOSITORIES: biostudies-literature

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1α,6β,7β,11α,15β-Penta-hydr-oxy-7α,20-ep-oxy-ent-kaur-16-ene.

Feng Chuang C Guo Lan-Qing LQ Yan Fu-Lin FL Cui Jian-Min JM Di Xue-Mei XM

Acta crystallographica. Section E, Structure reports online 20100113 Pt 2

The title compound, C(20)H(30)O(6), a natural ent-kaurane diterpenoid, named nervosanin B, was obtained from the medicinal plant Isodon serra. It is composed of four rings with the expected trans and cis junctions. One of the six-membered rings is in a chair conformation, the other two are in boat conformations and the five-membered ring adopts an evenlope conformation. The mol-ecules stack along the a axis and are linked together by inter-molecular O-H⋯O hydrogen bonds. Two intramolecular O-H⋯O ...[more]

PMID: 21579763

Similar Datasets

1α,6β,7β,14β,15β-Penta-hydr-oxy-7α,20-ep-oxy-ent-kaur-16-ene.

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6β-Acet-oxy-1α,7β,11β,15β-tetra-hydr-oxy-7α,20-ep-oxy-ent-kaur-16-ene.

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6β,15β-Diacet-oxy-1β,7β,13α-trihydr-oxy-7α,20-ep-oxy-ent-kaur-16-ene.

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15α,20β-Dihydr-oxy-6β-meth-oxy-6,7-seco-6,20-ep-oxy-1,7-olide-ent-kaur-16-ene.

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16α,17α-Ep-oxy-5α-hydr-oxy-6β-nitrooxy-20-oxopregnan-3β-yl acetate.

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(1α,2β,3α,7α,11α,13β)-1,3,11-Triacet-oxy-2,13-bis-(benz-yloxy)-7-hydr-oxy-21-methyl-N,19-secohetisan-19-al.

Project description:The title compound (delgradine), C(41)H(43)NO(12), is a hetisine-type C(20)-diterpenoid alkaloid, isolated from the roots of Aconitum carmichaeli Debx. In the crystal structure, the mol-ecule assumes an U-shaped conformation, the terminal benzene rings being approximately parallel and partially overlapped with each other. The mol-ecule contains eight alicyclic and heterocyclic rings. Cyclo-hexane rings A and B adopt similar chair conformations; the six-membered rings C, D and E form a bicyclo-[2.2.2]octane system with a boat conformation for each six-membered ring, the six-membered heterocyclic ring F has a screw-boat conformation and both of the five-membered rings G and H have envelope conformations. The crystal structure contains inter-molecular O-H⋯O hydrogen bonding.

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6β-Chloro-5α-hydr-oxy-20-oxopregnan-3β-yl acetate.

Project description:The title steroid, C(23)H(35)ClO(4), is a pregnane derivative prepared by ring opening of the corresponding 5α,6α-ep-oxy steroid with BiCl(3). There are two symmetry-independent mol-ecules in the asymmetric unit that show no significant differences concerning bond lengths and angles. The conformation of the six-membered rings in both mol-ecules is close to a chair form, while the five-membered ring adopts an envelope conformation. All rings in both mol-ecules are trans-fused. The mol-ecules are held together by an extensive O-H⋯O hydrogen-bonding network.

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Crystal structure of an ep-oxy-sterol: 9α,11α-ep-oxy-5α-cholest-7-ene-3β,5,6α-triol 3,6-di-acetate.

Project description:The title compound, C31H48O6, is a polyoxygenated ep-oxy steroid obtained by a multi-step synthesis involving oxidation of 7-de-hydro-cholesterol. It crystallizes in the P212121 space group; however, the absolute structure of the molecule in the crystal could not be determined by resonant scattering. The configuration at the C5 and C6 positions is in both cases of the α-type, as is that of the C atoms of the ep-oxy ring. Mol-ecules in the crystal form chains parallel to the b axis by hydrogen bonding between O-H donors and carbonyl O-atom acceptors. Some atoms of the alkyl chain are disordered over two orientations, with a refined occupancy ratio of 0.511 (10):0.489 (10).

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3α-Hydr-oxy-ent-atis-16-en-14-one.

Project description:The title compound, C(20)H(30)O(2), is an ent-atisane diterpenoid which was isolated from the roots of Euphorbia kansuensis. The mol-ecule contains five six-membered rings, among which three six-membered rings of the bicyclo-[2.2.2]octane unit adopt boat conformations and two cyclo-hexane rings adopt chair conformations. In the crystal structure, mol-ecules are connected by inter-molecular O-H⋯O hydrogen bonds, forming zigzag chains propagating parallel to [001].

| S-EPMC2977182 | biostudies-literature

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