Home Physical Sciences Crystal structure of tert-butyl 2-phenylethylcarbamate, C13H19NO2
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Crystal structure of tert-butyl 2-phenylethylcarbamate, C13H19NO2

  • Gamal A. El-Hiti EMAIL logo , Keith Smith , Mohammed B. Alshammari , Mansour D. Ajarim and Benson M. Kariuki
Published/Copyright: July 6, 2016

Abstract

C13H19NO2, monoclinic, P21/n (no. 14), a = 5.2692(3) Å, b = 13.8663(9) Å, c = 17.8020(13) Å, β = 93.323(6)°, V = 1298.50(15), Z = 4, Rgt(F) = 0.0590, wRref(F2) = 0.1932, T = 293 K.

CCDC no.:: 1487250

The asymmetric unit of the title structure is shown in the figure. Tables 1 and 2 contain details of the measurement method and a list of the atoms including atomic coordinates and displacement parameters.

Table 1

Data collection and handling.

Crystal:Colourless needle Size 0.57 × 0.18 × 0.10 mm
Wavelength:Mo Kα radiation (0.71073 Å)
μ:0.8 cm−1
Diffractometer, scan mode:SuperNova, ω
2θmax, completeness:59.8°, >99%
N(hkl)measured, N(hkl)unique, Rint:6696, 3146, 0.022
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 1985
N(param)refined:186
Programs:SHELX [14], CrysAlisPRO [15], WinGX [16]
Table 2

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

AtomxyzUiso*/Ueq
O1−0.1282(3)0.15249(12)−0.02887(9)0.0674(5)
O20.1718(2)0.24524(10)0.03205(8)0.0595(4)
C1a0.3832(2)−0.01016(10)−0.21915(8)0.056(2)
C2a0.1667(2)−0.00308(10)−0.26730(8)0.0677(17)
H2a0.05480.0481−0.26250.081*
C3a0.1176(2)−0.07251(10)−0.32257(8)0.0730(16)
H3a−0.0272−0.0678−0.35480.088*
C4a0.2850(2)−0.14901(10)−0.32968(8)0.0682(17)
H4a0.2521−0.1955−0.36670.082*
C5a0.5015(2)−0.15610(10)−0.28153(8)0.0739(17)
H5a0.6134−0.2073−0.28630.089*
C6a0.5506(2)−0.08667(10)−0.22626(8)0.0676(17)
H6a0.6954−0.0914−0.19400.081*
C7a0.4229(17)0.0638(8)−0.1572(5)0.070(3)
H7Aa0.60140.0643−0.14050.084*
H7Ba0.38150.1270−0.17770.084*
C8a0.2677(7)0.0468(3)−0.0900(2)0.070(3)
H8Aa0.09060.0388−0.10680.084*
H8Ba0.3242−0.0121−0.06490.084*
C1Ab0.3508(7)−0.0104(3)−0.2191(2)0.055(3)
C2Ab0.1686(7)−0.0229(3)−0.2779(2)0.068(2)
H2Ab0.03300.0198−0.28390.082*
C3Ab0.1890(7)−0.0994(3)−0.3277(2)0.078(2)
H3Ab0.0671−0.1078−0.36700.093*
C4Ab0.3917(7)−0.1633(3)−0.3186(2)0.075(2)
H4Ab0.4053−0.2145−0.35190.090*
C5Ab0.5739(7)−0.1508(3)−0.2598(2)0.087(2)
H5Ab0.7095−0.1936−0.25380.105*
C6Ab0.5535(7)−0.0743(3)−0.2100(2)0.076(2)
H6Ab0.6754−0.0660−0.17070.091*
C7Ab0.349(2)0.0737(9)−0.1667(6)0.064(3)
H7A1b0.51950.1005−0.16110.076*
H7A2b0.23800.1231−0.18870.076*
C8Ab0.2655(13)0.0486(4)−0.0927(4)0.066(4)
H8A1b0.08850.0292−0.09800.080*
H8A2b0.3630−0.0064−0.07380.080*
C90.0918(4)0.17255(14)−0.01289(11)0.0506(5)
C10−0.0073(4)0.30852(16)0.06855(12)0.0579(5)
C11−0.1721(5)0.36138(18)0.01000(16)0.0782(7)
H11A−0.06650.3920−0.02510.117*
H11B−0.27080.40930.03410.117*
H11C−0.28400.3164−0.01620.117*
C120.1684(5)0.3775(2)0.11144(18)0.0922(10)
H12A0.27560.34230.14720.138*
H12B0.06980.42370.13740.138*
H12C0.27180.41050.07700.138*
C13−0.1626(5)0.25076(18)0.12148(14)0.0718(7)
H13A−0.27960.21010.09280.108*
H13B−0.25560.29390.15190.108*
H13C−0.05140.21160.15330.108*
N10.2909(3)0.12580(13)−0.03773(10)0.0613(5)
H10.44070.1437−0.02170.074*

aOccupancy: 0.558(8); bOccupancy: 0.442(8).

Source of material

tert-Butyl 2-phenylethylcarbamate was synthesized from the reaction of 2-phenylethylamine with 1.2 equivalents of di-tert-butyl dicarbonate in the presence of 1.5 equivalents of triethylamine in dichloromethane at 0 °C for 15 minutes and then under reflux for 1 h. The crude product was purified by crystallization from hexane to give the title compound (90%) as colourless crystals, mp 56–57 °C (lit. 56.1–56.4 °C [1]; 54–55 °C [2]; 55–56 °C [3]).

Experimental details

The methylbenzene segment of the molecule is disordered and was refined with the occupancies 56(1)% and 44(1)%. The aromatic ring was constrained into a regular hexagon with C—C distances of 1.39 Å. All H atoms were placed in calculated positions and refined using a riding model. For the methyl groups, C—H bonds were fixed at 0.96 Å and Uiso(H) set to 1.5Ueq(C) with free rotation around the C—C bond. For the rest of the hydrogens, Uiso(H) was set to 1.2Ueq(C) with aromatic C—H and N—H distances of 0.93 and 0.86 Å, respectively.

Discussion

Various carbamate and thiocarbamate derivatives show antimicrobial activities [4], [5], [6] and various synthetic procedures have been reported for the production of carbamates. Convenient and efficient syntheses involve reactions of amino acids with Boc-benzotriazoles in the presence of triethylamine in aqueous acetonitrile at room temperature [7], of amines with phenyl 4,5-dichloro-6-oxopyridazine-1(6H)-carboxylate in tetrahydrofuran (THF) at room temperature [8], of nitriles with an excess of di-tert-butyl dicarbonate in the presence of a catalytic amount of nickel boride in methanol at room temperature [9], of aromatic carboxylic acids with di-tert-butyl dicarbonate in the presence of sodium azide, tetrabutylammonium bromide and zinc(II) trifluoromethanesulfonate in THF at 40 °C [10] and of nitro aromatics with excess chloroformates in the presence of zinc and ammonium chloride in aqueous THF at 0 °C [11]. High yields of substituted derivatives can be produced from regioselective lithiation of aryl carbamates using lithium reagents, at room temperature, followed by treatment of the lithium intermediates obtained in situ with electrophiles [12], [13].

The asymmetric unit of the title structure consists of one molecule with a disordered benzyl fragment. All bond lengths and angles are in the expected ranges. In the crystal structure, the amide group is involved in a N—H⋯O hydrogen bond (N⋯O distance = 3.078(2)Å, N—H⋯O angle = 153.3°) leading to the formation of C(4) chains along [100].

Acknowledgements:

The authors extend their appreciation to the College of Applied Medical Sciences Research Centre and the Deanship of Scientific Research at King Saud University for their funding of this research.

References

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Received: 2016-3-14
Accepted: 2016-6-22
Published Online: 2016-7-6
Published in Print: 2016-12-1

©2016 Gamal A. El-Hiti et al., published by De Gruyter.

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

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  63. Crystal structure of 2-amino-7-methyl-4-(3,4-difluoro-phenyl)-5-oxo-4H,5H-pyrano[4,3-b]pyran-3-carbonitrile, C16H10F2N2O3
  64. The crystal structure of 4-[(benzo[1,3]dioxol-5-ylmethylene)-amino]-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-one, C19H17N3O3
  65. Crystal structure of 1,4-dihydro-1-phenylchromeno[4,3-c]pyrazole, C16H12N2O
  66. Crystal structure of N-(5-((3,5-dimethylisoxazol-4-yl)sulfonyl)quinolin-8-yl)benzamide, C21H17N3O4S
  67. Crystal structure of 3-amino-9-methoxy-1-phenyl-1H-benzo[f]chromene-2-carbonitrile, C21H16N2O2
  68. Crystal structure of 1,2-bis(4-methoxyphenyl)-2-((3-(trifluoromethyl)phenyl)amino)ethan-1-one, C23H20F3NO3
  69. Crystal structure of 2-amino-4-(2,4-dinitrophenyl)-5-oxo-4H,5H-pyrano[3,2-c]chromene-3-carbonitrile – ethanol (1:1), C21H16N4O8
  70. Crystal structure of catena-poly-[(1-cyclopropyl-6-fluoro-4-oxo-7-(piperazin-1-ium-1-yl)-1,4-dihydroquinoline-3-carboxylate-κ2O,O′)-(μ2-4,4′-sulfonyldibenzoato-κ4O,O′:O′′,O′′′)zinc(II)] hemihydrate, C31H27ZnFN3O9.5S
  71. Crystal structure of 2-(2-bromophenyl)-5-methyl-1,3-dioxane-5-carboxylic acid, C12H13BrO4
  72. Crystal structure of 2-(2-bromophenyl)-5-ethyl-1,3-dioxane-5-carboxylic acid, C13H15BrO4
  73. Crystal structure of 4-(4-((3-bromophenyl)amino)-6-(tert-butyl)-3-(2-hydroxypropan-2-yl)cinnolin-8-yl)-2-methylbut-3-yn-2-ol, C26H30BrN3O2
  74. Crystal structure poly-(μ2-1-(4-(1H-imidazol-1-yl)benzyl)-1H-1,2,4-triazolyl-κ2NN1:N2N)-(μ3-2,2′-(1,2-phenylene)diacetato-κ5-O1,O2:O2:O3,O4)cadmium(II), C22H19CdN5O4
  75. Crystal structure of bis(1-ethyl-6-fluoro-4-oxido-7-(piperazin-1-ium-1-yl)-1,8-naphthyridin-1-ium-3-carboxylate-κ2O,O′)copper(II) benzene-1, 4-dicarboxylate dihydrate, C38H42F2CuN8O12
  76. Redetermination of the crystal structure of potassium lithium molybdate monohydrate, KLiMoO4·H2O
  77. Crystal structure of [tris(2-benzimidazolylmethyl)amine-κ3N](isonicotinate-κO) cobalt(II) [tris(2-benzimidazolylmethyl)amine-κ3N](isonicotinic acid-κO) cobalt(II) triperchlorate, C60H51N16O16Cl3Co2
  78. The crystal structure of tris(μ2-1,3-bis(4,4,4-trifluoro-3-oxido-1-(oxo)but-2-en-1-yl)phenyl-κ4O,O′:O′′,O′′′)-bis(1,2-dimethoxyethane-κ2O,O′)dicerium(III), C50H38F18O16Ce2
  79. Crystal structure of 8-isopropyl-8-aza-bicyclo[3.2.1]octan-3-ol, C10H19NO
  80. Crystal structure of 2,4-dibenzoyl-N,N-dimethylbenzenamine, C22H19NO2
  81. The crystal structure of 2-(4-methoxyphenyl)-6,8-diphenyl-4-(phenylamino)quinazoline — acetonitrile (1/1), C35H28N4O
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