Home Crystal structure of ethyl 2-((4-(3,5-dimethylisoxazol-4-yl)-2,6-difluorophenyl)amino)benzoate, C20H18F2N2O3
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Crystal structure of ethyl 2-((4-(3,5-dimethylisoxazol-4-yl)-2,6-difluorophenyl)amino)benzoate, C20H18F2N2O3

  • Wenqiang Tang ORCID logo EMAIL logo , Yanrong Gao , Xiaona Xu and Zhoujing Zhu
Published/Copyright: November 8, 2023

Abstract

C20H18F2N2O3, monoclinic, P21/n (no. 14), a = 7.5573(10) Å, b = 14.519(2) Å, c = 16.245(2) Å, β = 98.187(3)°, V = 1764.4(4) Å3, Z = 4, Rgt(F) = 0.0420 wRref(F2) = 0.1142, T = 205 K.

CCDC no.: 2292588

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 needle
Size: 0.18 × 0.11 × 0.05 mm
Wavelength: MoKα radiation (0.71073 Å)
μ: 0.11 mm−1
Diffractometer, scan mode: Bruker Apex-II, φ and ω
θmax, completeness: 27.5°, >99 %
N(hkl)measured, N(hkl)unique, Rint: 15,609, 4025, 0.039
Criterion for Iobs, N(hkl)gt: Iobs > 2σ(Iobs), 2974
N(param)refined: 298
Programs: Bruker [1], Shelx [2, 3], Olex2 [4]
Table 2:

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

Atom x y z Uiso*/Ueq
C1 0.2935 (2) 0.80581 (10) 0.53134 (11) 0.0371 (4)
C2 0.3319 (2) 0.73045 (10) 0.58256 (10) 0.0327 (3)
C3 0.4293 (2) 0.76722 (11) 0.65499 (11) 0.0412 (4)
C4 0.5159 (3) 0.72262 (14) 0.73242 (12) 0.0536 (5)
H4A 0.424941 0.702219 0.764865 0.080*
H4B 0.594336 0.766410 0.764596 0.080*
H4C 0.585005 0.670039 0.718477 0.080*
C5 0.1946 (2) 0.81475 (12) 0.44590 (11) 0.0472 (4)
H5A 0.130192 0.872723 0.440930 0.071*
H5B 0.110604 0.764217 0.435008 0.071*
H5C 0.278543 0.813159 0.405957 0.071*
C6 0.28626 (19) 0.63283 (9) 0.56408 (9) 0.0296 (3)
C7 0.2203 (2) 0.57651 (10) 0.62226 (9) 0.0327 (3)
H7 0.199177 0.600960 0.673540 0.039*
C8 0.1863 (2) 0.48490 (10) 0.60434 (9) 0.0319 (3)
C9 0.22075 (19) 0.44286 (9) 0.53144 (9) 0.0296 (3)
C10 0.2770 (2) 0.50286 (10) 0.47370 (9) 0.0307 (3)
C11 0.3098 (2) 0.59481 (10) 0.48769 (9) 0.0318 (3)
H11 0.347890 0.631852 0.446102 0.038*
C12 0.26996 (19) 0.27538 (9) 0.55691 (9) 0.0280 (3)
C13 0.3653 (2) 0.28517 (10) 0.63687 (9) 0.0325 (3)
H13 0.384196 0.344355 0.659897 0.039*
C14 0.4321 (2) 0.20939 (11) 0.68256 (10) 0.0349 (3)
H14 0.494160 0.217623 0.736437 0.042*
C15 0.4085 (2) 0.12110 (11) 0.64970 (10) 0.0363 (4)
H15 0.452531 0.069626 0.681258 0.044*
C16 0.3193 (2) 0.11017 (10) 0.57005 (10) 0.0339 (3)
H16 0.305434 0.050714 0.547146 0.041*
C17 0.2492 (2) 0.18554 (10) 0.52266 (9) 0.0295 (3)
C18 0.1540 (2) 0.17082 (10) 0.43736 (10) 0.0355 (3)
C19Aa 0.0050 (3) 0.06043 (14) 0.34238 (12) 0.0415 (5)
H19Aa −0.070596 0.112649 0.321602 0.050*
H19Ba −0.072768 0.007291 0.347210 0.050*
C19Bb 0.157 (3) 0.0582 (15) 0.3270 (11) 0.052 (4)
H19Cb 0.231956 0.007105 0.313141 0.063*
H19Db 0.179670 0.110817 0.292292 0.063*
C20Aa 0.1305 (3) 0.03886 (15) 0.28244 (13) 0.0498 (6)
H20Aa 0.063474 0.017272 0.230660 0.075*
H20Ba 0.213250 −0.008657 0.305498 0.075*
H20Ca 0.196616 0.093895 0.272023 0.075*
C20Bb −0.028 (3) 0.0317 (15) 0.3064 (12) 0.053 (4)
H20Db −0.053577 −0.018749 0.341994 0.079*
H20Eb −0.050344 0.012334 0.248756 0.079*
H20Fb −0.103807 0.083778 0.314671 0.079*
F1 0.11410 (14) 0.43314 (6) 0.66054 (6) 0.0473 (3)
F2 0.30249 (14) 0.46603 (6) 0.39964 (5) 0.0447 (3)
N1Ac 0.452 (3) 0.8603 (9) 0.6456 (10) 0.0479 (17)
N1Bd 0.3608 (18) 0.8846 (11) 0.5727 (13) 0.0417 (18)
N2 0.19246 (19) 0.34965 (8) 0.51139 (9) 0.0350 (3)
H2 0.160 (2) 0.3392 (12) 0.4608 (12) 0.042*
O1Ac 0.3577 (13) 0.8811 (7) 0.5657 (7) 0.0511 (19)
O1Bd 0.443 (4) 0.8536 (11) 0.6524 (12) 0.052 (3)
O2 0.11793 (17) 0.23072 (8) 0.38560 (7) 0.0451 (3)
O3Aa 0.1019 (2) 0.08292 (8) 0.42402 (8) 0.0403 (4)
O3Bb 0.210 (2) 0.0825 (8) 0.4125 (7) 0.039 (3)
  1. aOccupancy: 0.911 (4), bOccupancy: 0.089 (4), cOccupancy: 0.580 (14), dOccupancy: 0.420 (14).

1 Source of materials

A mixture of ethyl 2-((4-(2,4-dioxopentan-3-yl)-2,6-difluorophenyl)amino) benzoate (1.88 g, 5 mmol), triethylamine (1.01 g, 10 mmol) and hydroxylamine hydrochloride (0.41 g, 6 mmol) was dissolved in ethanol (10 mL). The mixture was refluxed for 6 h, until the TLC indicated the reaction was completed. The mixture was concentrated. The title compound was separated by silica-gel column chromatography with ethyl acetate-petroleum ether (30 %) gradient solvent system. The target product was obtained as a white solid. Yield: 58.5 %.

2 Experimental details

The crystal structure was solved using the Shelxt program [2] and refined in Shelxl [3]. The Olex2 software package [4] was utilized to visually display the crystal structure.

3 Comment

Diphenylamine and its derivatives are frequently employed as stabilizers in nitrocellulose-based explosives and propellants, in perfumery, as well as antioxidants in the rubber and elastomer industry. It serves as a foundation for multiple derivatives, employed in the production of dyes, pharmaceuticals, photography chemicals, and other specialized applications, making it a widely produced compound in global chemical industries [5]. In previous studies, the presence of intramolecular hydrogen bonding in the crystals of diphenylamine derivatives has been observed [6, 7]. This article presents a newly discovered diphenylamine derivative and provides a detailed analysis of its crystal structure.

The reported compound exhibits a molecular structure whereby all bond lengths, bond angles, and dihedral angles between atoms fall within the range observed in previously reported similar molecular structures [8], [9], [10], [11]. The two substituated phenyl rings exhibit a dihedral angle of 63.8°. Intramolecular hydrogen bonding is observed within the molecule, specifically involving N2–H2⋯O2, with a bond angle of 130.88(12)° and a bond length of 2.0211(16) Å. Furthermore, weak C–H⋯[pi] interactions are formed between the phenyl rings and the methyl and ethyl groups.


Corresponding author: Wenqiang Tang, Xianyang Key Laboratory of Molecular Imaging and Drug Synthesis, School of Pharmacy, Shaanxi Institute of International Trade & Commerce, Xianyang, Shaanxi, China, E-mail:

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

  2. Research funding: Key laboratory of molecular imaging and drug synthesis of Xianyang City (2021QXNL-PT-0008) and the scientific research plan project of Shaanxi provincial department of education (23JK0328).

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

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Received: 2023-09-24
Accepted: 2023-10-25
Published Online: 2023-11-08
Published in Print: 2024-02-26

© 2023 the author(s), published by De Gruyter, Berlin/Boston

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

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