Home Crystal constructure of 16(S)-methyl-6α-carboxy-1, 15-dioxo-6, 7-seco-ent-kaur-2-en-7, 20-olide, C20H24O6
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Crystal constructure of 16(S)-methyl-6α-carboxy-1, 15-dioxo-6, 7-seco-ent-kaur-2-en-7, 20-olide, C20H24O6

  • Neng-Wu Zhao , Jiang-Hai Ye , Chen-Liang Zhao , Jing-Jie Zhang and Lu-Tai Pan EMAIL logo
Published/Copyright: November 3, 2016

Abstract

C20H24O6, orthorhombic, P212121 (no. 19), a = 7.697(14) Å, b = 13.91(2) Å, c = 16.75(3) Å, V = 1794 Å3, Z = 4, Rgt(F) = 0.0430, wRref(F2) = 0.1087, T = 293 K.

CCDC no.:: 1508517

The asymmetric unit of the crystal structure is shown in the figure. Tables 1 and 2 contain details of the measurement method and a list of the atoms including atomic coordinates and displacement parameters.

Table 1

Data collection and handling.

Crystal:Colourless blocks
Size:0.24 × 0.23 × 0.21 mm
Wavelength:Mo Kα radiation (0.71073 Å)
μ:1.0 cm−1
Diffractometer, scan mode:Bruker APEX-II, φ and ω
2θmax, completeness:52°, >99%
N(hkl)measured, N(hkl)unique, Rint:12305, 3327, 0.056
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 2512
N(param)refined:236
Programs:SHELX [2], Bruker programs [3]
Table 2

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2).

AtomxyzUiso*/Ueq
C10.2181(3)0.20318(17)0.20048(13)0.0484(6)
C20.0937(4)0.1500(2)0.24967(15)0.0645(8)
H20.04930.09240.23030.077*
C30.0426(4)0.1804(2)0.31994(15)0.0653(8)
H3−0.03140.14010.34830.078*
C40.0909(3)0.27313(18)0.35911(13)0.0503(6)
C50.1925(3)0.33691(15)0.29904(12)0.0403(5)
H50.10370.36650.26510.048*
C60.2808(3)0.41966(17)0.34100(13)0.0466(6)
C70.6013(3)0.21400(18)0.15093(15)0.0514(6)
C80.5430(3)0.31356(16)0.12817(13)0.0436(6)
C90.3919(3)0.35780(16)0.17948(12)0.0408(5)
H90.44490.40930.21110.049*
C100.3190(3)0.28497(15)0.24043(12)0.0399(5)
C110.2579(3)0.40658(18)0.12593(14)0.0520(6)
H11A0.19250.35780.09750.062*
H11B0.17710.44260.15880.062*
C120.3424(3)0.47436(19)0.06578(15)0.0551(7)
H12A0.36900.53470.09200.066*
H12B0.26040.48770.02330.066*
C130.5102(3)0.43320(17)0.02926(14)0.0472(6)
H130.51980.4510−0.02720.057*
C140.5083(3)0.32376(17)0.03875(13)0.0490(6)
H14A0.39660.29680.02410.059*
H14B0.59890.29360.00730.059*
C150.6958(3)0.38373(18)0.13675(13)0.0475(6)
C160.6755(3)0.46194(17)0.07494(14)0.0492(6)
H160.65600.52350.10190.059*
C170.8374(3)0.4690(2)0.02353(16)0.0636(7)
H17A0.82260.5192−0.01520.095*
H17B0.85600.4090−0.00340.095*
H17C0.93580.48320.05660.095*
C18−0.0779(4)0.3264(2)0.38106(16)0.0664(8)
H18A−0.04980.38670.40580.100*
H18B−0.14450.28790.41740.100*
H18C−0.14460.33790.33360.100*
C190.1867(4)0.2507(2)0.43728(14)0.0699(8)
H19A0.21920.30970.46290.105*
H19B0.28900.21370.42590.105*
H19C0.11170.21460.47190.105*
C200.4757(3)0.23948(18)0.28090(13)0.0492(6)
H20A0.54970.28950.30250.059*
H20B0.43690.19950.32480.059*
O10.2457(3)0.18088(13)0.13163(10)0.0695(6)
O20.1920(2)0.49999(13)0.33388(12)0.0660(5)
H2A0.24330.54340.35710.099*
O30.4139(3)0.41425(14)0.37736(12)0.0813(7)
O40.6800(3)0.16234(13)0.10546(11)0.0695(5)
O50.5744(2)0.18158(12)0.22487(10)0.0572(5)
O60.8116(2)0.37705(15)0.18469(11)0.0726(6)

Source of material

The leaves of Isodon rubescens were collected in Xishui city of Guizhou province, China in June 2014 and identified by Prof. J. H. Zhao. The dried and powdered leaves (8 kg) were extracted with MeOH (× 3) and filtered. The filtrate was concentrated and extracted with ethyl acetate to give a residue. The residue was dissolved in MeOH and ethyl acetate, which was applied to silica gel column eluting with chloroform/acetone (8:2). The title compound, isolated from silica gel column with chloroform/acetone (7:3), was obtained as colourless needles by recrystallization in methanol.

Experimental details

Hydrogen atoms were positioned geometrically and refined using a riding model, with C—H = 0.93–0.97 Å, with Uiso(H) = 1.2Ueq(C) and Uiso(H) = 1.5Ueq(O).

Discussion

Experimental study shows that the main chemical compositions of Isodon rubescens are ent-kaurene diterpenoids. These compounds have antibacterial activity, anti-inflammatory activity and are resistant to a variety of animals with implanted tumor [1].

The title compound contains two ketone, one carboxy, one lactone, one olefine and three methyl-groups. The bond distances of C1—O1, C15—O6 and C7—O4 are 1.213(3) Å, 1.203(3) Å and 1.210(3) Å, which are typical for C = O groups. The carboxy group was confirmed by the distance of 1.316(3) Å and 1.194(3) Å, C6—O2 and C6—O3, respectively. The bond distances of C7—O5 and C20—O5 are 1.335(3) Å and 1.452(3) Å, which clearly confirmed olefinic moieties.

Award Identifier / Grant number: 81260635

Award Identifier / Grant number: 2009-700122

Funding statement: The authors gratefully acknowledge support from The National Natural Science Foundation of China [No. 81260635] and the Science and Technology Fund of Guizhou [No. 2009-700122], and Guiyang College of Traditional Chinese Medicine of Guizhou Province Academician Workstation [No. (2014) 4013].

Acknowledgements

The authors gratefully acknowledge support from The National Natural Science Foundation of China [No. 81260635] and the Science and Technology Fund of Guizhou [No. 2009-700122], and Guiyang College of Traditional Chinese Medicine of Guizhou Province Academician Workstation [No. (2014) 4013].

References

1 Henan Province medical research of pharmacology and medicine group, plants in Yunnan Province to study plant chemistry research laboratory. Isodon rubescens by chemical and pharmacological research. Newsletter of Chinese herbal medicine. 10 (1977) 5–7.Search in Google Scholar

2 Sheldrick, G. M.: A short history of SHELX. Acta Crystallogr. A64 (2008) 112–122.10.1107/S0108767307043930Search in Google Scholar PubMed

3 Bruker. APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, WI, USA, 2003.Search in Google Scholar

Received: 2016-4-11
Accepted: 2016-10-6
Published Online: 2016-11-3
Published in Print: 2017-1-1

©2016 Neng-Wu Zhao et al., published by De Gruyter.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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