Home Physical Sciences Crystal structure of 6,7-difluoro-1-methyl-3-(trifluoromethyl)quinoxalin-2(1H)-one, C10H5F5N2O
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Crystal structure of 6,7-difluoro-1-methyl-3-(trifluoromethyl)quinoxalin-2(1H)-one, C10H5F5N2O

  • Xia Mi ORCID logo EMAIL logo , Xuehui Hou and Beibei Cui
Published/Copyright: December 10, 2020

Abstract

C10H5F5N2O, monoclinic, P21/c (no. 14), a = 9.3018(2) Å, b = 25.1396(7) Å, c = 8.9439(2) Å, β = 102.005(3)°, V = 2045.72(10) Å3, Z = 8, Rgt(F) = 0.0458, wRref(F2) = 0.1345, T = 293(2) K.

CCDC no.: 2031746

The asymmetric unit of 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:Colourless block
Size:0.17 × 0.14 × 0.10 mm
Wavelength:Cu Kα radiation (1.54184 Å)
μ:1.58 mm−1
Diffractometer, scan mode:Xcalibur, ω
θmax, completeness:67.1°, 99%
N(hkl)measured, N(hkl)unique, Rint:7127, 3611, 0.025
Criterion for Iobs, N(hkl)gt:2628
N(param)refined:327
Programs:CrysAlisPRO [1], Olex2 [2], SHELX [3], [4]
Table 2:

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

AtomxyzUiso*/Ueq
C10.5554 (3)0.68851 (11)0.7590 (3)0.0571 (6)
H10.58480.65510.79820.068*
C20.6279 (3)0.73318 (12)0.8202 (3)0.0609 (6)
C30.5871 (3)0.78370 (11)0.7647 (3)0.0642 (7)
C40.4735 (3)0.78985 (10)0.6427 (3)0.0593 (6)
H40.44710.82360.60400.071*
C50.3967 (2)0.74498 (9)0.5756 (3)0.0491 (5)
C60.4357 (3)0.69416 (9)0.6360 (3)0.0495 (5)
C70.2327 (3)0.65641 (9)0.4544 (3)0.0528 (5)
C80.2081 (3)0.71122 (9)0.3956 (3)0.0503 (5)
C90.0827 (3)0.71911(10)0.2608 (3)0.0587 (6)
C100.3876 (4)0.59714 (10)0.6357 (3)0.0739 (8)
H10A0.48400.58710.62310.111*
H10B0.31670.57220.58280.111*
H10C0.38520.59710.74250.111*
F10.74124 (18)0.72864 (8)0.9402 (2)0.0852 (5)
F20.6612 (2)0.82564 (7)0.8345 (2)0.0901 (6)
F3−0.04551 (18)0.70739 (9)0.2942 (2)0.0901 (6)
F40.09574 (19)0.68898 (6)0.14250 (17)0.0714 (4)
F50.0777 (2)0.76912 (7)0.2100 (2)0.0874 (6)
N10.2826 (2)0.75215 (7)0.4511 (2)0.0515 (4)
N20.3524 (2)0.65092 (8)0.5725 (2)0.0535 (5)
O10.1531 (2)0.61906 (7)0.4026 (2)0.0743 (6)
C1′−0.0250 (2)0.50340 (10)0.7043 (3)0.0530 (5)
H1′−0.05320.46980.66590.064*
C2′−0.0933 (3)0.54789 (12)0.6359 (3)0.0614 (6)
C3′−0.0551 (3)0.59884 (11)0.6917 (3)0.0681 (7)
C4′0.0547 (3)0.60563 (11)0.8163 (3)0.0660 (7)
H4′0.08120.63960.85320.079*
C5′0.1280 (3)0.56076 (9)0.8891 (3)0.0507 (5)
C6′0.0881 (2)0.50949 (9)0.8335 (3)0.0468 (5)
C7′0.2720 (2)0.47218 (9)1.0365 (3)0.0490 (5)
C8′0.3047 (2)0.52796 (9)1.0828 (3)0.0496 (5)
C9′0.4268 (3)0.53690 (10)1.2215 (3)0.0590 (6)
C10′0.1288 (3)0.41194 (10)0.8517 (3)0.0650 (7)
H10D0.02500.40570.83720.098*
H10E0.18070.38680.92420.098*
H10F0.15880.40780.75590.098*
F1′−0.20100 (18)0.54312 (8)0.51098 (19)0.0817 (5)
F2′−0.1291 (2)0.64022 (8)0.6195 (3)0.1032 (7)
F3′0.55415 (17)0.51655 (8)1.2011 (2)0.0831 (5)
F4′0.39895 (18)0.51375 (7)1.34526 (16)0.0718 (4)
F5′0.4475 (2)0.58793 (7)1.2539 (2)0.0953 (7)
N1′0.2399 (2)0.56886 (8)1.0155 (2)0.0538 (5)
N2′0.1623 (2)0.46634 (7)0.9095 (2)0.0482 (4)
O1′0.3381 (2)0.43476 (7)1.1064 (2)0.0726 (6)

Source of material

The title compound was prepared by the reaction of 6,7-difluoro-1-methylquinoxalin-2(1H)-one (0.2 mmol) and trifluoromethyl sulfinyl chloride (0.4 mmol) in the presence of K2HPO4 (0.4 mmol) as base, CH3CN (1 mL) and H2O (50 μL) as solvents. The reaction was performed under N2 at 25 °C for 24 h and a 26 W CFL irradiation. The solvents were removed under reduced pressure and the residue was purified by chromatography to give the target product. The compound was crystallised by slow evaporation from a mixture of CH2Cl2 and hexane at room temperature.

Experimental details

Hydrogen atoms were placed in their geometrically idealized positions and constrained to ride on their parent atoms.

Comment

The quinoxalin-2(1H)-one skeleton is a crucially structural motif widely distributed in natural products as well as pharmaceutical molecules. In particular, 3-substituted quinoxalin-2(1H)-ones exhibit significant pharmaceutical and biological properties such as anti-angiogenesis, antitumor, antidiabetic, anti-inflammatory and antimicrobials [5], [6], [7]. The incorporation of the trifluoromethyl substituent, into drug molecules can significantly alter their properties such as lipophilicity, bioactivities and metabolic stability [8], [9], [10].

The asymmetric unit of the title structure contains two crystallographically independent but chemically identical molecules (cf. the figure). All bond lengths are in normal ranges [11]. The quinoxalin-2(1H)-one ring in the structure is planar.


Corresponding author: Xia Mi, Henan University of Chinese Medicine, Zhengzhou450046, P. R. China, E-mail:

Funding source: National Natural Science Foundation of China

Award Identifier / Grant number: 21602046

Funding source: Education Department of Henan Province

Award Identifier / Grant number: 2020GGJS107

Funding source: Henan University of Chinese Medicine

Award Identifier / Grant number: KCSZZD-2019-1

  1. Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: The National Natural Science Foundation of China (No. 21602046) and the Foundation for University Key Teachers from the Education Department of Henan Province (No. 2020GGJS107) and the Course Education Project of Henan University of Chinese Medicine (No. KCSZZD-2019-1).

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

References

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Received: 2020-10-27
Accepted: 2020-11-26
Published Online: 2020-12-10
Published in Print: 2021-03-26

© 2020 Xia Mi 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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