Home Physical Sciences Crystal structure of 7-hydroxy-5-methoxy-4,6-dimethylisobenzofuran-1(3H)-one, C11H12O4
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Crystal structure of 7-hydroxy-5-methoxy-4,6-dimethylisobenzofuran-1(3H)-one, C11H12O4

  • Pei-Wen Chen and Yi-Wen Tao EMAIL logo
Published/Copyright: December 22, 2018

Abstract

C11H12O4, monoclinic, P21/c (no. 14), a = 7.1609(3) Å, b = 4.6329(2) Å, c = 30.0028(14) Å, β = 96.635(4)°, V = 988.70(8) Å3, Z = 4, Rgt(F) = 0.0708, wRref(F2) = 0.1761, T = 100.01(10) K.

CCDC no.: 1870481

Table 1:

Data collection and handling.

Crystal:Colourless block
Size:0.13 × 0.12 × 0.11 mm
Wavelength:Cu Kα radiation (1.54184 Å)
μ:0.90 mm−1
Diffractometer, scan mode:SuperNova, ω
θmax, completeness:73.6°, >99%
N(hkl)measured, N(hkl)unique, Rint:6711, 1970, 0.088
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 1675
N(param)refined:140
Programs:CrylAlisPRO [1], SHELX [2], OLEX2 [3]
Table 2:

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

AtomxyzUiso*/Ueq
O1−0.01846(18)0.4873(3)0.66901(4)0.0196(4)
O20.1203(2)0.9075(3)0.74657(4)0.0235(4)
O30.3821(2)1.1300(3)0.73017(4)0.0209(4)
O40.38588(18)0.5412(3)0.55439(4)0.0185(4)
C10.1363(2)0.6048(4)0.65413(6)0.0148(4)
H1−0.0204220.5281860.6955420.029*
C20.1804(2)0.5184(4)0.61185(6)0.0153(4)
C30.3416(3)0.6327(4)0.59606(6)0.0151(4)
C40.4642(2)0.8294(4)0.62014(6)0.0161(4)
C50.4117(3)0.9143(4)0.66116(6)0.0162(4)
C60.2524(2)0.8070(4)0.67775(6)0.0156(4)
C70.2367(3)0.9435(4)0.72097(6)0.0179(4)
C80.5047(3)1.1211(4)0.69492(6)0.0194(5)
H8A0.6291251.0535720.7065220.023*
H8B0.5157431.3106910.6817560.023*
C90.0550(3)0.3052(4)0.58486(6)0.0190(4)
H9A0.0469870.1310700.6018910.028*
H9B0.1063250.2620410.5574490.028*
H9C−0.0683120.3865520.5780560.028*
C100.3057(3)0.7226(5)0.51866(6)0.0263(5)
H10A0.3450200.6572390.4908540.040*
H10B0.3471190.9177430.5242560.040*
H10C0.1710700.7148190.5168860.040*
C110.6392(3)0.9435(5)0.60296(7)0.0219(5)
H11A0.6150171.1328480.5906180.033*
H11B0.6751660.8170260.5800910.033*
H11C0.7389090.9535080.6272100.033*

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

Source of material

All solvents were of analytical grade. The title compound was isolated from the mangrove endophytic fungi Pestalotiopsis sp. collected from Dongzhai Harbor of Hainan Island, China, further purified by reversed-phase HPLC using a Sharpsil-U 5 μm C18 100 Å column (10.00 × 250 mm) and an isocratic 50% acetonitrile/50% H2O at the flowrate of 2 mL/min over 30 min, detection at 254 nm, and afforded 8.6 mg. Colorless crystals were obtained from slow evaporation of the methanol solution in open air at room temperature.

1H-NMR(400 MHz, Methanol-D4): 5.24 ppm (2H, s), 3.76 ppm (3H, s), 2.17 ppm (3H, s), 2.14 ppm (3H, s).

Experimental details

Uiso values of hydrogen atoms were set to 1.2Ueq of the parent atoms.

Comment

Pestalotiopsis sp. was isolated from the stem of mangrove Sonneratia apetala planted at Dongzhai Harbor of Hainan Island, China, and identified by 18S RNA gene sequence [4]. The strain was cultured and fermented using rice medium (rice 250 g/L, crude sea salt 2 g/L) on stable condition at 28 °C for 30 days as described in Zhang’s paper [5]. Then the culture was repetitively extracted with MeOH solvent and fractionated using normal-phase vacuum liquid chromatography (VLC) to obtain nine fractions (Fr. A-I). Fraction E (50% hexanes/50% EtOAc) was further purified by reversed-phase HPLC, and 7-hydroxy-5-methoxy-4,6-dimethylphthalide was obtained. Its structure was elucidated by comprehensive analysis of spectroscopic data, and confirmed by single-crystal X-ray crystallography.

7-hydroxy-5-methoxy-4,6-dimethylphthalide, as a phthalide derivative, carry a lactone formed by dehydrationreaction of γ-hydroxy carboxylic acids. Phthalides have been possessing various biological activities such as antifugi, antibacteria, antivirus, antitumor, treatment of thrombosis and cerebral vascular diseases [6], [7], [8].

The title compound has been reported before from the same fungus, containing its 1H-NMR and 13C-NMR data, it also showed significant antiviral activities against Cox-B3 and RSV with IC50 values of 19.6 μM and 21.0 μM [9]. The crystal structure of title compound has not been reported before, however similar compounds have been identified by X-ray crystallographic diffraction analysis [10].

Furthermore, the crystal structure of the parent is known, in which all geometric parameters are in accord with the present study [11].

Acknowledgements

This work was supported by Guangdong Natural Science Foundation of China (No. 2016A030313588), Special Fiscal Fund of Guangdong Provincial Oceanic and Fishery Administration in 2017 (A201701607), Fund of the Education Bureau of Guangzhou City (1201610155), and Open Laboratory Project of Guangzhou Medical University (No. 14 of the 27th Official Document Issued by Guangzhou Medical University in 2018).

References

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3. Dolomanov, O. V.; Bourhis, L. J.; Gildea, R. J.; Howard, J. A. K.; Puschmann, H.: OLEX2: a complete structure solution, refinement and analysis program. J. Appl. Crystallogr. 42 (2009) 339–341.10.1107/S0021889808042726Search in Google Scholar

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9. Jia, Y. L.; Guan, F. F.; Ma, J.; Wang, C. Y.; Shao, C. L.: Pestalotiolide A, a new antiviral phthalide derivative from a soft coral-derived fungus Pestalotiopsis sp. Nat. Prod. Sci. 21 (2015) 227–230.10.20307/nps.2015.21.4.227Search in Google Scholar

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Received: 2018-10-14
Accepted: 2018-11-25
Published Online: 2018-12-22
Published in Print: 2019-03-26

©2019 Pei-Wen Chen et al., published by De Gruyter, Berlin/Boston

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

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