Home Crystal structure of 3-(difluoromethyl)-1-methyl-N-(pyridin-2-yl)-1H-pyrazole-4-carboxamide, C11H10F2N4O
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Crystal structure of 3-(difluoromethyl)-1-methyl-N-(pyridin-2-yl)-1H-pyrazole-4-carboxamide, C11H10F2N4O

  • Xie Zi-Yin , Xiao Shu-Zhen , Wang Jie , Liu Shu-Juan EMAIL logo and Peng Da-Yong ORCID logo EMAIL logo
Published/Copyright: February 2, 2024

Abstract

C11H10F2N4O, monoclinic, P21/n (no. 14), a = 8.7616(10) Å, b = 14.2418(17) Å, c = 9.7191(12) Å, β = 107.6020°, V = 1156.0(2) Å3, Z = 4, R gt (F) = 0.0431, wR ref (F2) = 0.1263, T = 296(2) K.

CCDC no.: 2326064

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: Colorless block
Size: 0.20 × 0.18 × 0.14 mm
Wavelength: Mo Kα radiation (0.71073 Å)
μ: 0.12 mm−1
Diffractometer, scan mode:

θmax, completeness:
Bruker APEX-II, φ and ω

25.5°, >99 %
N(hkl)measured, N(hkl)unique, Rint: 8788, 2148, 0.024
Criterion for Iobs, N(hkl)gt: Iobs > 2σ(Iobs), 1745
N(param)refined: 165
Programs: Bruker [1], SHELX [2], [3], Diamond [4]
Table 2:

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

Atom x y z Uiso*/Ueq
C1 0.9350 (3) 0.56118 (15) 1.2027 (2) 0.0615 (6)
H1 0.9816 0.5561 1.3020 0.074*
C2 0.9831 (3) 0.63278 (15) 1.1330 (3) 0.0661 (6)
H2 1.0607 0.6753 1.1830 0.079*
C3 0.9137 (3) 0.64052 (16) 0.9866 (3) 0.0697 (6)
H3 0.9442 0.6886 0.9358 0.084*
C4 0.7985 (3) 0.57676 (15) 0.9150 (2) 0.0616 (6)
H4 0.7491 0.5813 0.8160 0.074*
C5 0.7593 (2) 0.50616 (13) 0.9952 (2) 0.0482 (5)
C6 0.5493 (2) 0.42514 (13) 0.8007 (2) 0.0492 (5)
C7 0.4370 (2) 0.34540 (12) 0.77671 (19) 0.0446 (4)
C8 0.3235 (2) 0.31971 (12) 0.64576 (19) 0.0447 (4)
C9 0.2908 (3) 0.36607 (14) 0.5021 (2) 0.0545 (5)
H9 0.3780 0.4090 0.5014 0.065*
C10 0.4122 (2) 0.28160 (13) 0.87412 (19) 0.0479 (5)
H10 0.4678 0.2790 0.9721 0.057*
C11 0.2273 (3) 0.14658 (15) 0.8623 (2) 0.0630 (6)
H11A 0.2549 0.0885 0.8258 0.094*
H11B 0.1129 0.1528 0.8343 0.094*
H11C 0.2693 0.1471 0.9657 0.094*
N1 0.8249 (2) 0.49765 (12) 1.13706 (18) 0.0568 (5)
N2 0.64840 (19) 0.43440 (11) 0.93725 (17) 0.0521 (4)
H2A 0.6427 0.3905 0.9963 0.063*
N3 0.29479 (18) 0.22431 (10) 0.80345 (16) 0.0479 (4)
N4 0.23787 (19) 0.24589 (11) 0.66193 (16) 0.0493 (4)
O1 0.5494 (2) 0.47916 (11) 0.70316 (17) 0.0755 (5)
F1 0.2688 (2) 0.30146 (10) 0.39675 (13) 0.0867 (5)
F2 0.1503 (2) 0.41216 (12) 0.46903 (16) 0.1016 (6)

1 Source of materials

4-(Difluoromethyl)-1-methyl-1H-pyrazole-4-carboxylic acid (1.76 g, 10.0 mmol), thionyl chloride (30.0 mmol) and N,N-dimethylformamide (0.5 mL) reacted at 95 °C for 4 h to obtain 3-(difluoromethyl)-1-methyl-1H-pyrazole-4-carbonyl chloride. The product was dissolved in CH2Cl2 (30.0 mL) for later use. Dissolve pyridin-2-amine (0.94 g, 10.0 mmol) and triethylamine (2.02 g, 20.0 mmol) in CH2Cl2 (30.0 mL) and cool to 0 °C. Add the solution of 3-(difluoromethyl)-1-methyl-1H-pyrazole-4-carbonyl chloride slowly under stirring conditions and react at room temperature for 6 h. Use TLC to detect the reaction until the raw material completely disappears. After the reaction is completed, elute and purify with column chromatography to obtain the title product in methanol.

2 Experimental details

All H atoms were included in calculated positions and refined as riding atoms, with C–H = 0.90–0.97 Å with Uiso(H) = 1.5 Ueq(C) for methyl H atoms and 1.2 Ueq(C) for all other H atoms.

3 Comment

Pyrazolamide compounds have excellent insecticidal and bactericidal activities, which have attracted the attention of researchers [5], [6], [7], [8]. For example, Zhong et al. reported on design, synthesis and anti-inflammatory activity of novel pyrazole amines derivatives [9], [10]. Qiao et al. studied the synthesis, crystal structure, antifungal activity, and molecular docking of difluoromethylpyrazole derivatives [11]. Sun et al. discovered that novel pyrazole amides could be used as promising candidate drugs for plant fungicides [12]. Many of these reports contain structures of difluoromethylpyrazolamide, and similar structural fungicides have also been launched in recent years. So In this paper, we use 4-(difluoromethyl)-1-methyl-1H-pyrazole-4-carboxylic acid as the raw material to design and synthesize 3-(difluoromethyl)-1-methyl-N-(pyridin-2-yl)-1H-pyrazole-4-carboxylamide.

In the molecule of the title compound, bond lengths and angles are very similar to those given in the literature [9, 10, 13]. The dihedral angle of the pyrazole ring and the pyridine ring plane is 3.60(7)°. The torsion angles of C8–C7–C6–O1, C8–C7–C6–N2, C7–C6–N2–C5, and C6–N2–C5–C4 are 1.7(3)°, −179.3(2)°, −175.2(2)°, and −7.4(3)°, respectively. Intermolecular N–H⋯N hydrogen bonds between the nitrogen atom (N3) of the amide group and the nitrogen atom (N2) of the pyrazole ring linked the molecules in a one-dimensional chain structure (lower part of the figure).


Corresponding authors: Liu Shu-Juan, Nanchang Reproductive Hospital, Nanchang 330001, People’s Republic of China, E-mail: ; and Peng Da-Yong, Key Laboratory of Chemical Utilization of Plant Resources of Nanchang/College of Chemistry and Materials, Jiangxi Agricultural University, Nanchang 330045, People’s Republic of China, E-mail:

Acknowledgments

X-ray data were collected at Instrumental Analysis Center Nanchang Hangkong University, Nanchang, 330063, People’s Republic of China.

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

  2. Research funding: This research was supported by the National Natural Science Foundation (No. 32160660, No. 31960295) Jiangxi Province Academic and Technical Leaders Training Program Leading Talents Project (20204BCJ22022), Special Funding for Major Scientific and Technological Research and Development in Jiangxi Province (20203ABC28W016), Special Research Project on CamphorTree (KRPCT) of Jiangxi Forestry Department (grant No. 2020CXZX07), the Research Foundation of Jiangxi Provincial Drug Administration [2021–03,2022–03], and the Earmarked Fund for the Youthful Innovation Research Team of Jiangxi Agricultural University-05, 2021 Innovation Team project of Ji’an City, Jiangxi Province.

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

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Received: 2023-12-03
Accepted: 2024-01-17
Published Online: 2024-02-02
Published in Print: 2024-04-25

© 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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