Home The crystal structure of 5-hydroxy-6,8-dimethoxy-2-methyl-4H-benzo[g]chromen-4-one– rubrofusarin B, C16H14O5
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The crystal structure of 5-hydroxy-6,8-dimethoxy-2-methyl-4H-benzo[g]chromen-4-one– rubrofusarin B, C16H14O5

  • Ting-Guang Zou , Si-Yu Guo , Jing-Lin Zhu , Sheng Wang EMAIL logo , Ling-Yin Lin and Yi-Wen Tao ORCID logo
Published/Copyright: February 15, 2021

Abstract

C16H14O5, monoclinic, P21/c (no. 14), a = 9.0005(11) Å, b = 16.0386(15) Å, c = 9.8434(11) Å, β = 114.861(14)°, V = 1289.3(3) Å3, Z = 4, Rgt(F) = 0.0458, wRref(F2) = 0.1245, T = 150(1) K.

CCDC no.: 2052053

The molecular structure is shown in the figure. Table 1 contains crystallographic data and Table 2 contains the list of the atoms including atomic coordinates and displacement parameters.

Table 1:

Data collection and handling.

Crystal:Yellow block
Size:0.13 × 0.12 × 0.10 mm
Wavelength:Mo Kα radiation (0.71073 Å)
μ:0.11 mm−1
Diffractometer, scan mode:SuperNova, ω
θmax, completeness:25.0°, >99%
N(hkl)measuredN(hkl)uniqueRint:5600, 2266, 0.022
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 1809
N(param)refined:194
Programs:CrysAlisPRO [1], SHELX [2], Olex2 [3]
Table 2:

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

AtomxyzUiso*/Ueq
O10.78908 (15)0.84499 (8)0.50175 (13)0.0257 (3)
O20.58623 (15)0.59409 (7)0.60455 (13)0.0239 (3)
O30.36755 (15)0.59571 (8)0.70845 (13)0.0236 (3)
H30.2992670.5812400.7385470.035*
O40.14519 (15)0.60616 (8)0.80276 (13)0.0263 (3)
O50.17684 (14)0.86012 (7)0.79365 (12)0.0217 (3)
C10.4779 (2)0.72043 (11)0.65159 (17)0.0171 (4)
C20.5882 (2)0.67855 (11)0.60250 (17)0.0185 (4)
C30.6868 (2)0.72326 (11)0.55541 (18)0.0213 (4)
H3A0.7582560.6952360.5252190.026*
C40.6824 (2)0.81084 (11)0.55165 (17)0.0199 (4)
C50.5790 (2)0.85395 (11)0.59614 (18)0.0197 (4)
H50.5760860.9118960.5923270.024*
C60.47671 (19)0.80970 (11)0.64799 (16)0.0172 (4)
C70.3727 (2)0.85469 (11)0.69630 (17)0.0193 (4)
H70.3714800.9126600.6937970.023*
C80.2743 (2)0.81254 (11)0.74654 (17)0.0177 (4)
C90.2690 (2)0.72499 (11)0.75075 (17)0.0182 (4)
C100.3719 (2)0.67927 (11)0.70354 (16)0.0177 (4)
C110.1581 (2)0.68417 (12)0.80228 (17)0.0203 (4)
C120.0637 (2)0.73889 (12)0.85092 (18)0.0238 (4)
H12−0.0076080.7161370.8871340.029*
C130.0761 (2)0.82210 (12)0.84535 (17)0.0213 (4)
C14−0.0131 (2)0.88461 (13)0.8942 (2)0.0285 (5)
H14A0.0585270.9060970.9906830.043*
H14B−0.1061820.8586970.9004090.043*
H14C−0.0492510.9294440.8230700.043*
C150.6952 (2)0.55137 (12)0.5566 (2)0.0279 (5)
H15A0.6717070.5670970.4554850.042*
H15B0.6810110.4922790.5612560.042*
H15C0.8062060.5660430.6208110.042*
C160.7795 (2)0.93298 (12)0.4746 (2)0.0293 (5)
H16A0.6704680.9473250.4046250.044*
H16B0.8556780.9483630.4339780.044*
H16C0.8058300.9622370.5669440.044*

Source of material

All solvents of analytical grade were used. The title compound was isolated and purified from the metabolites of Aspergillus fumigatus (for details see the Comment section).

Experimental details

All hydrogen atoms were placed in calculated positions and refined using a riding model with the relative isotropic parameters. Uiso values of hydrogen atoms were set to 1.2 Ueq of the parent atoms.

Comment

The endophytic fungus A. fumigatus. was isolated from mangrove tree Sonneratia apetala in Dongzhai harbor, Hainan Province, and identified by 18S DNA gene sequence [4]. The specimen was stored at Guangzhou Medical University, Guangzhou, P. R. China. This fungus strain was fermented statically by using rice medium (85 g rice, 160 mL coarse sea salt solution with a mass concentration of 2 g/L) in a 1 L Erlenmeyer flask at 28 °C for fourty days. The metabolites of A. fumigatus were extracted with methanol, and then dried with rotary evaporator. The extract was further purified from the culture by various chromatographic purification techniques. The title compound was isolated and purified from 20% petroleum 80% ethyl acetate fraction through silica gel column chromatography. Its structure was identified by MS and NMR spectroscopic data, and confirmed by X-ray crystallography. Crystallization of the title compound in CHCl2–N-hexane (6:1, v/v) gave yellow crystals at room temperature. It has been reported that this compound displayed antibacterial activity against C. Albi-cans and Escherichia coli, and shown to be cytotoxic to the colon cancer cell line SW1116 [5], [6], [7], [8], [9]. What’s more, the X-ray crystallography data of the title compound are reported here for the first time. The geometric parameters are similar to those reported for the parent compound rubrofusarin [10].


Corresponding author: Yi-Wen Tao, Key Laboratory of Molecular Target & Clinical Pharmacology and the State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences & The Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 511436, P. R. China, E-mail:

Award Identifier / Grant number: 2018A0303130201

Funding source: Guangzhou Education Bureau Yangcheng Scholars Project

Award Identifier / Grant number: 202032774

Funding source: National Studenets’ Training Programs for innovation and Entrepreneurship

Award Identifier / Grant number: 202010570028

Funding source: Special Funds for Undergraduates Scientific and Technological Innovation Training Programs in Guangdong

Award Identifier / Grant number: pdjh2020b0487, S201910570075, S201910570069

Funding source: Undergraduate Training Programs for Innovation and Entrepreneurship in GZHMU

Award Identifier / Grant number: 2019A076, 2018A107, 2018A103

  1. Author contributions: Ting-Guang Zou, Si-Yu Guo, Jing-Lin Zhu and Sheng Wang contributed equally to this work and all the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: Guangdong Natural Science Foundation of China (2018A0303130201), Guangzhou Education Bureau Yangcheng Scholars Project (202032774), National Studenets’ Training Programs for innovation and Entrepreneurship (202010570028), Special Funds for Undergraduates Scientific and Technological Innovation Training Programs in Guangdong (pdjh2020b0487, S201910570075, S201910570069), and Undergraduate Training Programs for Innovation and Entrepreneurship in GZHMU (2019A076, 2018A107, 2018A103).

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

References

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Received: 2020-12-28
Accepted: 2021-01-14
Published Online: 2021-02-15
Published in Print: 2021-05-26

© 2021 Ting-Guang Zou et al., published by De Gruyter, Berlin/Boston

This work is licensed under the Creative Commons Attribution 4.0 International License.

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