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Acta Crystallogr Sect E Struct Rep Online. 2010 May 1; 66(Pt 5): o1042.
Published online 2010 April 10. doi:  10.1107/S1600536810011906
PMCID: PMC2979252

5-Bromo-3-ethyl­sulfinyl-2-(4-fluoro­phen­yl)-7-methyl-1-benzofuran

Abstract

In the title compound, C17H14BrFO2S, the 4-fluoro­phenyl ring is rotated slightly out of the benzofuran plane, making a dihedral angle of 7.60 (4)°. The crystal structure is stabilized by a Br(...)O halogen-bonding inter­action [3.048 (1) Å].

Related literature

For the crystal structures of similar 3-ethyl­sulfinyl-2-(4-fluoro­phen­yl)-5-halo-1-benzofuran derivatives, see: Choi et al. (2010a [triangle],b [triangle]). For the pharmacological activity of benzofuran compounds, see: Aslam et al. (2006 [triangle]); Galal et al. (2009 [triangle]); Khan et al. (2005 [triangle]). For natural products with benzofuran rings, see: Akgul & Anil (2003 [triangle]); Soekamto et al. (2003 [triangle]). For a review of halogen bonding, see: Politzer et al. (2007 [triangle]).

An external file that holds a picture, illustration, etc.
Object name is e-66-o1042-scheme1.jpg

Experimental

Crystal data

  • C17H14BrFO2S
  • M r = 381.25
  • Triclinic, An external file that holds a picture, illustration, etc.
Object name is e-66-o1042-efi1.jpg
  • a = 7.3446 (2) Å
  • b = 10.6107 (3) Å
  • c = 11.3132 (5) Å
  • α = 111.555 (2)°
  • β = 94.643 (2)°
  • γ = 108.900 (2)°
  • V = 755.49 (4) Å3
  • Z = 2
  • Mo Kα radiation
  • μ = 2.87 mm−1
  • T = 174 K
  • 0.31 × 0.26 × 0.15 mm

Data collection

  • Bruker SMART APEXII CCD diffractometer
  • Absorption correction: multi-scan (SADABS; Bruker, 2009 [triangle]) T min = 0.471, T max = 0.674
  • 13244 measured reflections
  • 3493 independent reflections
  • 3194 reflections with I > 2σ(I)
  • R int = 0.036

Refinement

  • R[F 2 > 2σ(F 2)] = 0.026
  • wR(F 2) = 0.068
  • S = 1.07
  • 3493 reflections
  • 201 parameters
  • H-atom parameters constrained
  • Δρmax = 0.29 e Å−3
  • Δρmin = −0.58 e Å−3

Data collection: APEX2 (Bruker, 2009 [triangle]); cell refinement: SAINT (Bruker, 2009 [triangle]); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 [triangle]); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 [triangle]); molecular graphics: ORTEP-3 (Farrugia, 1997 [triangle]) and DIAMOND (Brandenburg, 1998 [triangle]); software used to prepare material for publication: SHELXL97.

Supplementary Material

Crystal structure: contains datablocks global, I. DOI: 10.1107/S1600536810011906/ng2754sup1.cif

Structure factors: contains datablocks I. DOI: 10.1107/S1600536810011906/ng2754Isup2.hkl

Additional supplementary materials: crystallographic information; 3D view; checkCIF report

supplementary crystallographic information

Comment

Many compounds involving benzofuran moiety show potent pharmacological activities such as antifungal (Aslam et al.., 2006), antitumor and antiviral (Galal et al.., 2009), antimicrobial (Khan et al.., 2005) properties. These compounds occur widely in nature (Akgul & Anil, 2003; Soekamto et al.., 2003). As a part of our ongoing studies of the effect of side chain substituents on the solid state structures of 3-ethylsulfinyl-2-(4-fluorophenyl)-5-halo-1-benzofuran analogues (Choi et al.., 2010a,b), we report the crystal structure of the title compound (Fig. 1).

The benzofuran unit is essentially planar, with a mean deviation of 0.013 (1) Å from the least-squares plane defined by the nine constituent atoms. The dihedral angle formed by the benzofuran plane and the 4-fluorophenyl ring is 7.60 (4)°. The crystal packing (Fig. 2) is stabilized by Br···O halogen bonding interactions between the bromine and the oxygen of the S═O unit [C4–Br···O2i = 3.048 (1) Å; C4–Br···O2i = 170.73 (6)°] (Politzer et al., 2007).

Experimental

77% 3-Chloroperoxybenzoic acid (224 mg, 1.0 mmol) was added in small portions to a stirred solution of 5-bromo-3-ethylsulfanyl-2-(4-fluorophenyl)-7-methyl-1-benzofuran (329 mg, 0.9 mmol) in dichloromethane (40 mL) at 273 K. After being stirred at room temperature for 4h, the mixture was washed with saturated sodium bicarbonate solution and the organic layer was separated, dried over magnesium sulfate, filtered and concentrated at reduced pressure. The residue was purified by column chromatography (hexane-ethyl acetate, 1:1 v/v) to afford the title compound as a colorless solid [yield 81%, m.p. 436-437 K; Rf = 0.65 (hexane-ethyl acetate, 1:1 v/v)]. Single crystals suitable for X-ray diffraction were prepared by slow evaporation of a solution of the title compound in tetrahydrofuran at room temperature.

Refinement

All H atoms were positioned geometrically and refined using a riding model, with C–H = 0.95 Å for aryl, 0.98 Å for methylene and methyl H atoms. Uiso(H)=1.2Ueq(C) for aryl and methylene H atoms, and 1.5Ueq(C) for methyl H atoms.

Figures

Fig. 1.
The molecular structure of the title compound with the atom numbering scheme. Displacement ellipsoids are drawn at the 50% probability level. H atoms are presented as a small spheres of arbitrary radius.
Fig. 2.
Br···O interactions (dotted lines) in the crystal structure of the title compound. [Symmetry codes: (i) - x, - y + 1, - z + 2.]

Crystal data

C17H14BrFO2SZ = 2
Mr = 381.25F(000) = 384
Triclinic, P1Dx = 1.676 Mg m3
Hall symbol: -P 1Mo Kα radiation, λ = 0.71073 Å
a = 7.3446 (2) ÅCell parameters from 8577 reflections
b = 10.6107 (3) Åθ = 2.2–27.6°
c = 11.3132 (5) ŵ = 2.87 mm1
α = 111.555 (2)°T = 174 K
β = 94.643 (2)°Block, colourless
γ = 108.900 (2)°0.31 × 0.26 × 0.15 mm
V = 755.49 (4) Å3

Data collection

Bruker SMART APEXII CCD diffractometer3493 independent reflections
Radiation source: Rotating Anode3194 reflections with I > 2σ(I)
Bruker HELIOS graded multilayer opticsRint = 0.036
Detector resolution: 10.0 pixels mm-1θmax = 27.6°, θmin = 2.0°
[var phi] and ω scansh = −9→9
Absorption correction: multi-scan (SADABS; Bruker, 2009)k = −13→12
Tmin = 0.471, Tmax = 0.674l = −13→14
13244 measured reflections

Refinement

Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.026Hydrogen site location: difference Fourier map
wR(F2) = 0.068H-atom parameters constrained
S = 1.07w = 1/[σ2(Fo2) + (0.0335P)2 + 0.2459P] where P = (Fo2 + 2Fc2)/3
3493 reflections(Δ/σ)max < 0.001
201 parametersΔρmax = 0.29 e Å3
0 restraintsΔρmin = −0.58 e Å3

Special details

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > 2sigma(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

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

xyzUiso*/Ueq
Br0.20782 (3)0.72623 (2)1.086606 (16)0.03206 (8)
S0.05552 (6)0.19539 (4)0.57197 (4)0.02301 (10)
F0.24222 (19)0.15769 (15)−0.03546 (11)0.0455 (3)
O10.27205 (17)0.57068 (12)0.53317 (11)0.0219 (2)
O2−0.10175 (19)0.19674 (15)0.64784 (14)0.0345 (3)
C10.1662 (2)0.37550 (18)0.58283 (16)0.0203 (3)
C20.2030 (2)0.50589 (18)0.69956 (16)0.0209 (3)
C30.1867 (2)0.53431 (19)0.82812 (16)0.0234 (3)
H30.14510.45800.85680.028*
C40.2345 (2)0.67946 (19)0.91155 (17)0.0241 (3)
C50.2930 (2)0.79348 (19)0.87163 (17)0.0240 (3)
H50.32180.89090.93290.029*
C60.3099 (2)0.76755 (18)0.74429 (17)0.0222 (3)
C70.2652 (2)0.62129 (18)0.66271 (16)0.0205 (3)
C80.2100 (2)0.41988 (18)0.48532 (16)0.0203 (3)
C90.2121 (2)0.34816 (19)0.34813 (16)0.0219 (3)
C100.2479 (3)0.4298 (2)0.27369 (17)0.0268 (4)
H100.26510.53010.31210.032*
C110.2587 (3)0.3664 (2)0.14460 (18)0.0320 (4)
H110.28510.42240.09450.038*
C120.2301 (3)0.2198 (2)0.09087 (16)0.0312 (4)
C130.1893 (3)0.1346 (2)0.15890 (18)0.0306 (4)
H130.16620.03330.11810.037*
C140.1825 (3)0.1992 (2)0.28841 (17)0.0276 (4)
H140.15750.14200.33750.033*
C150.3686 (3)0.8872 (2)0.69820 (19)0.0295 (4)
H15A0.35480.97440.76110.044*
H15B0.28310.85450.61290.044*
H15C0.50640.91120.69040.044*
C160.2622 (3)0.1950 (2)0.66993 (18)0.0287 (4)
H16A0.32450.29020.74710.034*
H16B0.21520.11680.70100.034*
C170.4128 (3)0.1691 (2)0.5895 (2)0.0319 (4)
H17A0.35230.07300.51520.048*
H17B0.52640.17210.64390.048*
H17C0.45710.24560.55750.048*

Atomic displacement parameters (Å2)

U11U22U33U12U13U23
Br0.04146 (12)0.02764 (11)0.01931 (11)0.00761 (8)0.00969 (7)0.00583 (8)
S0.0257 (2)0.0181 (2)0.0225 (2)0.00599 (16)0.00715 (16)0.00724 (17)
F0.0572 (7)0.0540 (8)0.0207 (6)0.0234 (6)0.0151 (5)0.0078 (5)
O10.0283 (6)0.0189 (6)0.0201 (6)0.0103 (5)0.0073 (4)0.0083 (5)
O20.0304 (6)0.0323 (7)0.0360 (8)0.0069 (6)0.0163 (6)0.0118 (6)
C10.0228 (7)0.0185 (8)0.0202 (8)0.0096 (6)0.0056 (6)0.0072 (7)
C20.0208 (7)0.0193 (8)0.0224 (8)0.0084 (6)0.0047 (6)0.0078 (7)
C30.0264 (8)0.0227 (8)0.0216 (8)0.0090 (7)0.0065 (6)0.0101 (7)
C40.0251 (8)0.0257 (9)0.0199 (8)0.0090 (7)0.0069 (6)0.0081 (7)
C50.0257 (8)0.0192 (8)0.0239 (8)0.0091 (6)0.0061 (6)0.0050 (7)
C60.0231 (7)0.0198 (8)0.0249 (8)0.0101 (6)0.0057 (6)0.0089 (7)
C70.0224 (7)0.0225 (8)0.0195 (8)0.0115 (6)0.0065 (6)0.0091 (7)
C80.0208 (7)0.0182 (8)0.0224 (8)0.0091 (6)0.0046 (6)0.0077 (7)
C90.0193 (7)0.0253 (8)0.0205 (8)0.0093 (6)0.0040 (6)0.0084 (7)
C100.0286 (8)0.0257 (9)0.0224 (9)0.0081 (7)0.0049 (7)0.0084 (7)
C110.0341 (9)0.0382 (11)0.0239 (9)0.0105 (8)0.0075 (7)0.0157 (8)
C120.0291 (9)0.0412 (11)0.0184 (9)0.0144 (8)0.0069 (7)0.0062 (8)
C130.0346 (9)0.0291 (10)0.0256 (9)0.0161 (8)0.0079 (7)0.0049 (8)
C140.0314 (9)0.0280 (9)0.0241 (9)0.0139 (7)0.0087 (7)0.0090 (8)
C150.0383 (9)0.0227 (9)0.0308 (10)0.0143 (7)0.0089 (8)0.0122 (8)
C160.0382 (9)0.0261 (9)0.0262 (9)0.0150 (8)0.0067 (7)0.0132 (8)
C170.0297 (9)0.0298 (10)0.0374 (11)0.0122 (8)0.0065 (8)0.0148 (9)

Geometric parameters (Å, °)

Br—C41.900 (2)C9—C101.397 (2)
Br—O2i3.048 (1)C9—C141.404 (2)
S—O21.495 (1)C10—C111.387 (3)
S—C11.770 (2)C10—H100.9500
S—C161.808 (2)C11—C121.381 (3)
F—C121.361 (2)C11—H110.9500
O1—C71.375 (2)C12—C131.369 (3)
O1—C81.383 (2)C13—C141.384 (3)
C1—C81.372 (2)C13—H130.9500
C1—C21.445 (2)C14—H140.9500
C2—C71.388 (2)C15—H15A0.9800
C2—C31.396 (2)C15—H15B0.9800
C3—C41.384 (2)C15—H15C0.9800
C3—H30.9500C16—C171.517 (3)
C4—C51.396 (2)C16—H16A0.9900
C5—C61.388 (2)C16—H16B0.9900
C5—H50.9500C17—H17A0.9800
C6—C71.391 (2)C17—H17B0.9800
C6—C151.496 (2)C17—H17C0.9800
C8—C91.460 (2)
C4—Br—O2i170.73 (6)C11—C10—H10119.5
O2—S—C1106.31 (8)C9—C10—H10119.5
O2—S—C16107.61 (9)C12—C11—C10118.21 (18)
C1—S—C1697.95 (8)C12—C11—H11120.9
C7—O1—C8107.02 (12)C10—C11—H11120.9
C8—C1—C2107.05 (14)F—C12—C13118.78 (18)
C8—C1—S128.90 (13)F—C12—C11118.35 (17)
C2—C1—S123.59 (12)C13—C12—C11122.88 (17)
C7—C2—C3119.53 (15)C12—C13—C14118.59 (18)
C7—C2—C1105.42 (14)C12—C13—H13120.7
C3—C2—C1135.05 (16)C14—C13—H13120.7
C4—C3—C2116.47 (15)C13—C14—C9120.82 (17)
C4—C3—H3121.8C13—C14—H14119.6
C2—C3—H3121.8C9—C14—H14119.6
C3—C4—C5123.00 (16)C6—C15—H15A109.5
C3—C4—Br118.94 (13)C6—C15—H15B109.5
C5—C4—Br117.99 (13)H15A—C15—H15B109.5
C6—C5—C4121.42 (16)C6—C15—H15C109.5
C6—C5—H5119.3H15A—C15—H15C109.5
C4—C5—H5119.3H15B—C15—H15C109.5
C5—C6—C7114.64 (15)C17—C16—S109.86 (13)
C5—C6—C15122.56 (16)C17—C16—H16A109.7
C7—C6—C15122.79 (16)S—C16—H16A109.7
O1—C7—C2110.53 (14)C17—C16—H16B109.7
O1—C7—C6124.55 (15)S—C16—H16B109.7
C2—C7—C6124.91 (15)H16A—C16—H16B108.2
C1—C8—O1109.97 (14)C16—C17—H17A109.5
C1—C8—C9135.84 (15)C16—C17—H17B109.5
O1—C8—C9114.16 (14)H17A—C17—H17B109.5
C10—C9—C14118.50 (16)C16—C17—H17C109.5
C10—C9—C8119.51 (16)H17A—C17—H17C109.5
C14—C9—C8121.98 (15)H17B—C17—H17C109.5
C11—C10—C9120.97 (17)
O2—S—C1—C8−132.95 (15)C5—C6—C7—C21.6 (2)
C16—S—C1—C8116.00 (16)C15—C6—C7—C2−177.44 (16)
O2—S—C1—C238.33 (15)C2—C1—C8—O1−0.13 (17)
C16—S—C1—C2−72.72 (15)S—C1—C8—O1172.28 (12)
C8—C1—C2—C70.71 (17)C2—C1—C8—C9177.69 (17)
S—C1—C2—C7−172.20 (12)S—C1—C8—C9−9.9 (3)
C8—C1—C2—C3179.68 (18)C7—O1—C8—C1−0.51 (17)
S—C1—C2—C36.8 (3)C7—O1—C8—C9−178.85 (13)
C7—C2—C3—C40.2 (2)C1—C8—C9—C10173.69 (18)
C1—C2—C3—C4−178.62 (17)O1—C8—C9—C10−8.5 (2)
C2—C3—C4—C51.1 (2)C1—C8—C9—C14−7.4 (3)
C2—C3—C4—Br177.98 (12)O1—C8—C9—C14170.35 (14)
C3—C4—C5—C6−1.1 (3)C14—C9—C10—C11−1.5 (3)
Br—C4—C5—C6−178.01 (12)C8—C9—C10—C11177.43 (15)
C4—C5—C6—C7−0.3 (2)C9—C10—C11—C121.0 (3)
C4—C5—C6—C15178.82 (16)C10—C11—C12—F−179.44 (15)
C8—O1—C7—C20.99 (17)C10—C11—C12—C130.8 (3)
C8—O1—C7—C6−177.55 (15)F—C12—C13—C14178.23 (16)
C3—C2—C7—O1179.79 (14)C11—C12—C13—C14−2.0 (3)
C1—C2—C7—O1−1.05 (17)C12—C13—C14—C91.5 (3)
C3—C2—C7—C6−1.7 (2)C10—C9—C14—C130.3 (3)
C1—C2—C7—C6177.48 (15)C8—C9—C14—C13−178.65 (15)
C5—C6—C7—O1179.99 (14)O2—S—C16—C17170.98 (13)
C15—C6—C7—O10.9 (3)C1—S—C16—C17−79.03 (14)

Symmetry codes: (i) −x, −y+1, −z+2.

Footnotes

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: NG2754).

References

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  • Brandenburg, K. (1998). DIAMOND Crystal Impact GbR, Bonn, Germany.
  • Bruker (2009). APEX2 SADABS and SAINT Bruker AXS Inc., Madison, Wisconsin, USA.
  • Choi, H. D., Seo, P. J., Son, B. W. & Lee, U. (2010a). Acta Cryst. E66, o629. [PMC free article] [PubMed]
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  • Khan, M. W., Alam, M. J., Rashid, M. A. & Chowdhury, R. (2005). Bioorg. Med. Chem 13, 4796–4805. [PubMed]
  • Politzer, P., Lane, P., Concha, M. C., Ma, Y. & Murray, J. S. (2007). J. Mol. Model 13, 305–311. [PubMed]
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  • Soekamto, N. H., Achmad, S. A., Ghisalberti, E. L., Hakim, E. H. & Syah, Y. M. (2003). Phytochemistry, 64, 831–834. [PubMed]

Articles from Acta Crystallographica Section E: Structure Reports Online are provided here courtesy of International Union of Crystallography