Home Crystal structure of ethyl 1-(4-chlorophenyl)-5-methyl-1H-1,2,3-triazole-4 carboxylate, C12H12ClN3O2
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Crystal structure of ethyl 1-(4-chlorophenyl)-5-methyl-1H-1,2,3-triazole-4 carboxylate, C12H12ClN3O2

  • Iván Brito EMAIL logo , Victor Kesternich EMAIL logo , Marcia Pérez-Fehrmann , Andrea Bugueño , Catherine Araneda and Alejandro Cárdenas
Published/Copyright: April 7, 2017

Abstract

C12H12ClN3O2, monoclinic, P21/c (no. 14), a = 13.5673(5) Å, b = 7.7549(3) Å, c = 12.4911(5) Å, β = 102.468(2)°, V = 1283.23(9) Å3, Z = 4, Rgt(F) = 0.047, wRref(F2) = 0.123, T = 293(2) K.

CCDC no.:: 1540098

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.

Table 1

Data collection and handling.

Crystal:Colourless parallelepiped
Size:0.18 × 0.10 × 0.08 mm
Wavelength:Cu Kα radiation (1.54178 Å)
μ:26.4 cm−1
Diffractometer, scan mode:Bruker AXS, φ and ω
2θmax, completeness:118°, >99%
N(hkl)measured, N(hkl)unique, Rint:12946, 1835, 0.056
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 1498
N(param)refined:166
Programs:Bruker [1], SHELX [2], PLATON [3]
Table 2

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

AtomxyzUiso*/Ueq
Cl10.15384(6)0.38969(14)−0.01408(8)0.1067(4)
N10.53730(14)0.3725(2)0.31511(14)0.0476(5)
N20.53072(16)0.3264(3)0.41950(15)0.0584(6)
N30.62191(16)0.3290(3)0.47923(16)0.0586(6)
O10.82490(14)0.3722(3)0.56269(16)0.0861(7)
O20.85300(15)0.4195(4)0.39692(18)0.1050(9)
C10.2672(2)0.3879(4)0.0817(2)0.0641(7)
C20.3509(2)0.3161(3)0.0543(2)0.0597(7)
H20.34690.2703−0.01530.072*
C30.44105(19)0.3122(3)0.13057(19)0.0523(6)
H30.49810.26320.11300.063*
C40.44588(18)0.3818(3)0.23331(18)0.0474(6)
C50.36158(19)0.4554(3)0.2603(2)0.0577(7)
H50.36560.50280.32950.069*
C60.2721(2)0.4577(4)0.1843(2)0.0678(8)
H60.21490.50610.20180.081*
C70.68700(18)0.3756(3)0.41528(19)0.0506(6)
C80.63409(18)0.4042(3)0.31011(19)0.0470(6)
C90.6665(2)0.4649(4)0.2102(2)0.0649(8)
H9B0.68410.36750.17080.097*
H9A0.72400.53920.23110.097*
H9C0.61220.52720.16430.097*
C100.7955(2)0.3913(4)0.4558(2)0.0658(8)
C110.9336(3)0.3817(7)0.6062(3)0.1351(19)
H11A0.96830.32550.55550.162*
H11B0.95420.50170.61180.162*
C120.9620(3)0.3057(8)0.7070(4)0.1393(18)
H12C0.93250.19290.70480.209*
H12B0.93920.37480.76070.209*
H12A1.03420.29620.72620.209*

Source of material

The title compound was obtained using the synthetic method described by Kalmaraj et al. [4]. A mixture of para-chloroaniline (7.24 mmol) in 4.50 mL of HCl /water (1:1) was cooled at 0–5 °C and added dropwise a solution of sodium nitrite 525 mg (7.60 mmol) in 30 mL of water. The resulting mixture was stirred for 10 minutes, then it was slowly added a solution of sodium azide (612 mg, 9.41 mmol) in 60 mL of cold water. The mixture was stirred for 30 minutes and extracted with 10 ml of diethyl ether and washed successively with water (3 × 6 mL). The organic phase was dried over anhydrous sodium sulfate and concentrated in vacuum at 30 °C affording the phenylazide. The phenylazide obtained was dissolved in DMSO and 7.96 mmol (1.1 eq) of ethyl acetoacetate and 1.0 g of K2CO3 (1 eq) were added. The mixture was stirred for 3 h and the reaction stopped by adding 30 mL of cold water. The precipitate obtained was filtered under vacuum, washed with cold water and vacuum drying, obtaining 1.98 g (yield 78%) of the title compound. Finally, crystallization from ethanol gave colourless crystals, mp. 168–170 °C. IR (KBr) cm−1: 3096 and 3066 (CAr–H), 1716 (C = O), 1560 (N = N), 1223 (CO–O), 1026 (Ar–Cl), 981 (N–N = N). 1H-NMR (500 MHz, CDCl3) δ: 7.54 (d, J = 6.9 Hz, 2H), 7.40 (d, J = 7.3 Hz, 2H), 4.44 (q, J = 6.5 Hz, 2H), 2.58 (s, 3H), 1.43 (t, J = 6.7 Hz, 3H). 13C-NMR (126 MHz, CDCl3) δ: 161.7 (C = O), 139.0 (C), 137.0 (C), 136.4 (C), 134.0 (C), 130.1 (CH), 126.8 (CH), 61.3 (CH2), 14.5 (CH3), 10.2 (CH3). HRESIMS: m/z 266.0680 for C12H13ClN3O2 [M + H]+, calculated: m/z 266.0696.

Experimental details

H atoms were located in the difference Fourier map, but refined with fixed individual displacement parameters, using a riding model with C—H distances of 0.93 Å (for aromatic rings), 0.92 Å; 0.96 Å (for CH2 and CH3 respectively), with U(H) values of 1.2Ueq(C) (for CH in aromatic moiety and CH2), and 1.5Ueq(C) (for CH3).

Discussion

1,2,3-Triazoles are an important class of heterocyclic compounds due to their wide range of applications as pharmaceutical agents [5, 6] . The diversity of chemical structures of the 1,2,3-triazole family and their useful biological activities made these compounds attractive targets in synthetic organic chemistry and many studies have been reported on the synthesis of these compounds [7], [8], [9].

The title compound is isomorphous with the ethyl 1-(4-bromophenyl)-5-methyl-1H-1,2,3-triazole-4 carboxylate analogue, reported by Singh, et al. [10]. The triazole ring make angles of 7.1(3)° with the lateral chain and 42.41(18)° with the phenyl ring. The crystal packing is stabilized only by van der Waals interactions. All distances and angles are in the normal ranges.

Acknowledgement

IB Thanks to fondequip grant N° (EQM13–0021). VK thanks to European Union Project ChemBioFight (Grant 269301).

References

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Received: 2017-1-5
Accepted: 2017-3-24
Published Online: 2017-4-7
Published in Print: 2017-5-24

©2017 Iván Brito et al., published by De Gruyter, Berlin/Boston

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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