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

ABSTRACT: The title compound, C(22)H(32)O(7), a natural ent-kaurane diterpenoid also referred to as Maoyecrystal F, was obtained from the medicinal plant Isodon nervosa. There are four rings with the expected cis and trans junctions. Cyclohexane ring A adopts a chair conformation, rings B and C adopt boat conformations, while the five-membered ring has an envelope conformation. The mol-ecules stack along the a axis in the crystal and are linked together by inter-molecular O-H⋯O hydrogen bonds.

SUBMITTER: Yan FL

PROVIDER: S-EPMC2979918 | biostudies-literature |

REPOSITORIES: biostudies-literature

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

Project description: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.

| S-EPMC2979982 | biostudies-literature

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

Project description:The title compound, enmenol, C(20)H(30)O(6), a natural ent-kaurane diterpenoid, comprises five fused rings, four of which are six-membered. Cyclo-hexane ring A adopts a chair conformation, rings B and C adopt boat conformations, while ring D has an envelope conformation, and two intramolecular O-H?O interactions occur. In the crystal, inter-molecular O-H?O hydrogen bonds generate a two dimensional network.

| S-EPMC2980239 | biostudies-literature

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

Project description:The title compound, C(24)H(34)O(8), a natural ent-kaurane diterpenoid, is composed of four rings with the expected cis and trans junctions. The crystal structure is stabilized by inter-molecular O-H?O hydrogen bonds. In addition, an intra-molecular O-H?O hydrogen bond occurs.

| S-EPMC2979703 | biostudies-literature

(20R,24R,25S)-3α,7α,12α,27-Tetra-acet-oxy-24,26-ep-oxy-5β-cholestane.

Project description:In the title anhydro-scymnol tetra-acetate, C(35)H(54)O(9), the fused chair conformation of the cyclo-hexane A/B ring junction is cis with a 5β-H configuration. The compound has a trimethyl-ene oxide ring at position 24,26 and four acetate groups at the 3α,7α,12α,27 positions.

| S-EPMC2977710 | biostudies-literature

1?,11?,15?-Triacet-oxy-7?-hydroxy-7?,20-ep-oxy-ent-kaur-16-en-6-one.

Project description:The title compound, C(26)H(34)O(9), a natural ent-kaurane diterpenoid, is composed of four rings with the expected cis and trans junctions. In the crystal structure, the mol-ecules stack along the a axis and are linked together by inter-molecular O-H?O hydrogen bonds.

| S-EPMC2971301 | biostudies-literature

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

Project description:The title compound, C(21)H(30)O(6), a natural ent-kaurane diterpenoid, was obtained from the medicinal plant Isodon serra. The five rings in the mol-ecule exhibit the expected cis and trans junctions. The three six-membered rings adopt chair, twist-boat and boat conformations, while two five-membered rings adopt envelope conformations. There are two mol-ecules in the asymmetric unit, related by a non-crystallographic twofold screw axis; the main difference is in the different degrees of distortion of ring B. In the crystal, the mol-ecules are linked by inter-molecular O-H?O hydrogen bonds, forming chains along the b axis.

| S-EPMC2984011 | biostudies-other

9?-Acet-oxy-1?,10?-ep-oxy-parthenolide.

Project description:The title compound, C(17)H(22)O(6), was semi-synthesized from 9-hy-droxy-arthenolide, which was isolated from the chloro-form extract of the aerial parts of Anvillea radiata. The mol-ecule contains fused five- and ten-membered rings: the five-membered lactone ring has a twisted conformation, whereas the ten-membered ring displays an approximate chair-chair conformation. The dihedral angle between the rings is 24.76?(9)°.

| S-EPMC3011600 | biostudies-literature

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.

| S-EPMC2962054 | biostudies-literature

3?-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

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

Project description:The title steroid, C(23)H(33)NO(8), is a pregnane derivative obtained regio-, stereo- and chemoselectively from the ring opening of the corresponding 5?,6?;16?,17?-diepoxide with bis-muth(III) nitrate. There are two symmetry-independent mol-ecules in the asymmetric unit that show no significant differences concerning bond lengths and angles. All rings are trans-fused. The conformations of the six-membered rings are close to chair forms, while the five-membered ring adopts an envelope conformation. The mol-ecules are held together by an extensive O-H?O hydrogen-bonding network of chains runnning along the a axis.

| S-EPMC2969566 | biostudies-literature

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