Home Crystal structure of ethyl 5,6-dichloro-2-methyl-2,3-dihydro-1 H-benzo[d]imidazole-2-carboxylate, C11H12Cl2N2O2
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Crystal structure of ethyl 5,6-dichloro-2-methyl-2,3-dihydro-1 H-benzo[d]imidazole-2-carboxylate, C11H12Cl2N2O2

  • Tao Li and Zhen Yao ORCID logo EMAIL logo
Published/Copyright: January 5, 2024

Abstract

C11H12Cl2N2O2, monoclinic, P21/c (no. 14), a = 19.937(2) Å, b = 5.7080(8) Å, c = 23.406(3) Å, β = 108.521(4)°, V = 2525.7(6) Å3, Z = 8, R gt (F) = 0.0483, wR ref (F2) = 0.1171, T = 200 K.

CCDC no.: 2233520

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: 0.45 × 0.32 × 0.13 mm
Wavelength: Mo Kα radiation (0.71073 Å)
μ: 0.51 mm−1
Diffractometer, scan mode: Bruker APEX-II, φ and ω
θmax, completeness: 27.5°, >99 %
N(hkl)measured, N(hkl)unique, Rint: 13,598, 2900, 0.072
Criterion for Iobs, N(hkl)gt: Iobs > 2σ(Iobs), 1942
N(param)refined: 160
Programs: CrysAlisPRO ( 1 ), Olex2 ( 2 ), SHELX ( 3 , 4 )
Table 2:

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

Atom x y z Uiso*/Ueq
Cl1 0.52171 (3) 0.23970 (13) 0.66578 (4) 0.0463 (2)
Cl2 0.54234 (3) 0.70377 (13) 0.60081 (4) 0.0484 (2)
O1 0.81396 (10) −0.0916 (3) 0.59900 (8) 0.0413 (5)
O2 0.85050 (9) 0.2559 (3) 0.57668 (7) 0.0307 (4)
N1 0.79140 (10) 0.1126 (4) 0.70260 (9) 0.0261 (5)
H1 0.7927 (13) −0.040 (5) 0.7040 (11) 0.033 (8)*
N2 0.80730 (9) 0.4614 (3) 0.66323 (8) 0.0229 (4)
H2 0.830110 0.592167 0.661858 0.027*
C1 0.72572 (11) 0.2250 (4) 0.68192 (10) 0.0211 (5)
C2 0.66105 (12) 0.1623 (4) 0.68586 (10) 0.0253 (5)
H2A 0.654858 0.019577 0.704452 0.030*
C3 0.60437 (12) 0.3157 (4) 0.66156 (11) 0.0265 (5)
C4 0.61333 (12) 0.5220 (4) 0.63437 (11) 0.0278 (6)
C5 0.67997 (11) 0.5896 (4) 0.63193 (10) 0.0240 (5)
H5 0.686426 0.733545 0.613956 0.029*
C6 0.73560 (11) 0.4397 (4) 0.65654 (9) 0.0201 (5)
C7 0.83747 (11) 0.2252 (4) 0.67297 (10) 0.0231 (5)
C8 0.91481 (12) 0.2211 (5) 0.71169 (11) 0.0314 (6)
H8A 0.931387 0.058599 0.717894 0.047*
H8B 0.919825 0.293901 0.750749 0.047*
H8C 0.943054 0.308215 0.691379 0.047*
C9 0.83162 (11) 0.1068 (4) 0.61219 (10) 0.0233 (5)
C10 0.85219 (14) 0.1732 (5) 0.51817 (11) 0.0338 (6)
H10A 0.805461 0.110110 0.494222 0.041*
H10B 0.888091 0.048343 0.523278 0.041*
C11 0.87082 (16) 0.3817 (5) 0.48766 (12) 0.0437 (7)
H11A 0.874053 0.335147 0.448318 0.066*
H11B 0.916444 0.444925 0.512568 0.066*
H11C 0.834188 0.501914 0.482074 0.066*

1 Source of material

To an oven-dried tube were sequentially added 4,5-dichlorobenzene-1,2-diamine (105.6 mg, 0.6 mmol), toluene (1 mL), ethyl 2-oxopropanoate (23.2 mg, 0.2 mmol), and boron trifluoride diethyl etherate (8.5 mg, 30 mol%). The reaction mixture was open to the air and stirred at room temperature for 20 min. After completion of the reaction, the solution was concentrated in vacuum. The residue was purified by silica gel column chromatography using a mixture of petroleum ether and ethyl acetate (5:1) as eluent to give the desired product.

2 Experimental details

The carbon-bound hydrogen atoms were placed in their geometrically idealized positions and constrained to ride on their parent atoms.

3 Comment

2,3–Dihydro-1H-benzo[d]imidazole and its derivatives are important bioactive substances, which are the basic structures of many natural products and important intermediates in the synthesis of a variety of drugs (5, 6, 7). Therefore, synthesis and modification of imidazoles has been a hot topic in the field of medicine and pharmacy.

The basic structure of the title compound is imidazole, containing a 2,3-dihydro-1H-benzo[d]imidazole, an acid ester, and two chlorine atoms. The C=O bond on the ester group was confirmed by the distance of 1.197(3) Å (O1–C9). The key lengths and angles obtained from the title structure are within the normal range and are consistent with those previously reported in similar structures ( 8 , 9 ).


Corresponding author: Zhen Yao, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, P.R. China, E-mail:

Acknowledgments

The authors gratefully acknowledge support from the project of Guizhou University of Traditional Chinese Medicine. ([2019]06).

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

  2. Competing interests: The authors declare no conflicts of interest regarding this article.

  3. Research funding: National Natural Science Foundation of China (22368018), and Guizhou University of Traditional Chinese Medicine ([2019]06).

References

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Received: 2023-12-07
Accepted: 2023-12-31
Published Online: 2024-01-05
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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