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ISSN: 2056-9890

Crystal structure of 2,5-di­methyl-3-(2-methyl­phenyl­sulfin­yl)-1-benzo­furan

aDepartment of Chemistry, Dongeui University, San 24 Kaya-dong, Busanjin-gu, Busan 614-714, Republic of Korea, and bDepartment of Chemistry, Pukyong National University, 599-1 Daeyeon 3-dong, Nam-gu, Busan 608-737, Republic of Korea
*Correspondence e-mail: uklee@pknu.ac.kr

Edited by V. V. Chernyshev, Moscow State University, Russia (Received 30 June 2015; accepted 2 July 2015; online 8 July 2015)

In the title compound, C17H16O2S, the dihedral angle between the benzo­furan ring system [r.m.s. deviation = 0.009 (1) Å] and the 2-methyl­phenyl ring is 86.72 (4)°. In the crystal, weak C—H⋯O hydrogen bonds link the mol­ecules into columns along the b-axis direction.

1. Related literature

For the pharmacological properties of benzo­furan compounds, see: Aslam et al. (2009[Aslam, S. N., Stevenson, P. C., Kokubun, T. & Hall, D. R. (2009). Microbiol. Res. 164, 191-195.]); Galal et al. (2009[Galal, S. A., Abd El-All, A. S., Abdallah, M. M. & El-Diwani, H. I. (2009). Bioorg. Med. Chem. Lett. 19, 2420-2428.]); Howlett et al. (1999[Howlett, D. R., Perry, A. E., Godfrey, F., Swatton, J. E., Jennings, K. H., Spitzfaden, C., Wadsworth, H., Wood, S. J. & Markwell, R. E. (1999). Biochem. J. 340, 283-289.]); Wahab Khan et al. (2005[Wahab Khan, M., Jahangir Alam, M., Rashid, M. A. & Chowdhury, R. (2005). Bioorg. Med. Chem. 13, 4796-4805.]); Ono et al. (2002[Ono, M., Kung, M. P., Hou, C. & Kung, H. F. (2002). Nucl. Med. Biol. 29, 633-642.]). For natural products with a benzo­furan ring, see: Akgul & Anil (2003[Akgul, Y. Y. & Anil, H. (2003). Phytochemistry, 63, 939-943.]); Soekamto et al. (2003[Soekamto, N. H., Achmad, S. A., Ghisalberti, E. L., Hakim, E. H. & Syah, Y. M. (2003). Phytochemistry, 64, 831-834.]). For a related structure, see: Choi et al. (2012[Choi, H. D., Seo, P. J. & Lee, U. (2012). Acta Cryst. E68, o1410.]). For further synthetic details, see: Choi et al. (1999[Choi, H. D., Seo, P. J. & Son, B. W. (1999). J. Korean Chem. Soc. 43, 606-608.]).

[Scheme 1]

2. Experimental

2.1. Crystal data

  • C17H16O2S

  • Mr = 284.36

  • Monoclinic, P 21 /n

  • a = 10.8458 (2) Å

  • b = 8.0139 (1) Å

  • c = 16.4295 (2) Å

  • β = 96.709 (1)°

  • V = 1418.23 (4) Å3

  • Z = 4

  • Mo Kα radiation

  • μ = 0.23 mm−1

  • T = 173 K

  • 0.44 × 0.33 × 0.30 mm

2.2. Data collection

  • Bruker SMART APEXII CCD diffractometer

  • Absorption correction: multi-scan (SADABS; Bruker, 2009[Bruker (2009). APEX2, SADABS and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA.]) Tmin = 0.692, Tmax = 0.746

  • 25176 measured reflections

  • 3529 independent reflections

  • 3091 reflections with I > 2σ(I)

  • Rint = 0.033

2.3. Refinement

  • R[F2 > 2σ(F2)] = 0.037

  • wR(F2) = 0.103

  • S = 1.05

  • 3529 reflections

  • 184 parameters

  • H-atom parameters constrained

  • Δρmax = 0.30 e Å−3

  • Δρmin = −0.27 e Å−3

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A D—H H⋯A DA D—H⋯A
C6—H6⋯O2i 0.95 2.45 3.3772 (18) 166
C17—H17B⋯O2ii 0.98 2.55 3.458 (2) 154
Symmetry codes: (i) [-x+{\script{1\over 2}}, y-{\script{1\over 2}}, -z+{\script{3\over 2}}]; (ii) x, y-1, z.

Data collection: APEX2 (Bruker, 2009[Bruker (2009). APEX2, SADABS and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA.]); cell refinement: SAINT (Bruker, 2009[Bruker (2009). APEX2, SADABS and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA.]); data reduction: SAINT; program(s) used to solve structure: SHELXS2014 (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015[Sheldrick, G. M. (2015). Acta Cryst. C71, 3-8.]); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012[Farrugia, L. J. (2012). J. Appl. Cryst. 45, 849-854.]) and DIAMOND (Brandenburg, 1998[Brandenburg, K. (1998). DIAMOND. Crystal Impact GbR, Bonn, Germany.]); software used to prepare material for publication: SHELXL2014 (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]).

Supporting information


Comment top

Benzofuran derivatives show interesting pharmacological properties such as antibacterial and antifungal, antitumor and antiviral, antimicrobial activities (Aslam et al. 2009; Galal et al., 2009; Wahab Khan et al., 2005), and potential inhibitor of β-amyloid aggregation (Howlett et al., 1999; Ono et al., 2002). These benzofuran compounds occur in a great number of natural products. (Akgul & Anil, 2003; Soekamto et al., 2003). As a part of our continuing project on benzofuran derivatives (Choi et al., 2012), we report herein on the crystal structure of the title compound.

In the title molecule (Fig. 1), the benzofuran unit is essentially planar, with a mean deviation of 0.009 (1) Å from the least-squares plane defined by the nine constituent atoms. The 2-methylphenyl ring is essentially planar, with a mean deviation of 0.004 (1) Å from the least-squares plane defined by the six constituent atoms. The dihedral angle formed by the benzofuran ring and the 2-methylphenyl ring is 86.72 (4)°. In the crystal, molecules are linked into a chain along the b axis direction by C—H···O hydrogen bonds (Table 1 and Fig. 2). These molecules are connected on either side of this chain by further C—H···O hydrogen bonds (Table 1 and Fig. 2).

Related literature top

For the pharmacological properties of benzofuran compounds, see: Aslam et al. (2009); Galal et al. (2009); Howlett et al. (1999); Wahab Khan et al. (2005); Ono et al. (2002). For natural products with a benzofuran ring, see: Akgul & Anil (2003); Soekamto et al. (2003). For a related structure, see: Choi et al. (2012). For further synthetic details, see: Choi et al. (1999).

Experimental top

The starting material 2,5-dimethyl-3-(2-methylphenylsulfanyl)-1-benzofuran was prepared by literature method (Choi et al. 1999). 3-Chloroperoxybenzoic acid (77%, 224 mg, 1.0 mmol) was added in small portions to a stirred solution of 2,5-dimethyl-3-(2-methylphenylsulfanyl)-1-benzofuran (241 mg, 0.9 mmol) in dichloromethane (25 ml) at 273 K. After being stirred at room temperature for 8h, the mixture was washed with saturated sodium bicarbonate solution (2 X 10 ml) 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, 2:1 v/v) to afford the title compound as a colorless solid [yield 68% (174 mg); m.p. 415–416 K; Rf = 0.49 (hexane–ethyl acetate, 2:1 v/v)]. Single crystals suitable for X-ray diffraction were prepared by slow evaporation of a solution of the title compound (21 mg) in ethyl acetate (20 ml) at room temperature.

Refinement top

All H atoms were positioned geometrically and refined using a riding model, with C—H = 0.95 Å for aryl and 0.98 Å for methyl H atoms, Uiso (H) = 1.2Ueq (C) for aryl and 1.5Ueq (C)) for methyl H atoms. The positions of methyl hydrogens were optimized using the command AFIX in SHELXL-2014/7 (Sheldrick, 2015)

Structure description top

Benzofuran derivatives show interesting pharmacological properties such as antibacterial and antifungal, antitumor and antiviral, antimicrobial activities (Aslam et al. 2009; Galal et al., 2009; Wahab Khan et al., 2005), and potential inhibitor of β-amyloid aggregation (Howlett et al., 1999; Ono et al., 2002). These benzofuran compounds occur in a great number of natural products. (Akgul & Anil, 2003; Soekamto et al., 2003). As a part of our continuing project on benzofuran derivatives (Choi et al., 2012), we report herein on the crystal structure of the title compound.

In the title molecule (Fig. 1), the benzofuran unit is essentially planar, with a mean deviation of 0.009 (1) Å from the least-squares plane defined by the nine constituent atoms. The 2-methylphenyl ring is essentially planar, with a mean deviation of 0.004 (1) Å from the least-squares plane defined by the six constituent atoms. The dihedral angle formed by the benzofuran ring and the 2-methylphenyl ring is 86.72 (4)°. In the crystal, molecules are linked into a chain along the b axis direction by C—H···O hydrogen bonds (Table 1 and Fig. 2). These molecules are connected on either side of this chain by further C—H···O hydrogen bonds (Table 1 and Fig. 2).

For the pharmacological properties of benzofuran compounds, see: Aslam et al. (2009); Galal et al. (2009); Howlett et al. (1999); Wahab Khan et al. (2005); Ono et al. (2002). For natural products with a benzofuran ring, see: Akgul & Anil (2003); Soekamto et al. (2003). For a related structure, see: Choi et al. (2012). For further synthetic details, see: Choi et al. (1999).

Computing details top

Data collection: APEX2 (Bruker, 2009); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SHELXS2014 (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and DIAMOND (Brandenburg, 1998); software used to prepare material for publication: SHELXL2014 (Sheldrick, 2008).

Figures top
[Figure 1] Fig. 1. The molecular structure of the title compound, showing the atom-numbering scheme. Displacement ellipsoids are drawn at the 50% probability level. H atoms are presented as small spheres of arbitrary radius.
[Figure 2] Fig. 2. A view of the C—H···O hydrogen bonds (dotted lines) in the crystal structure of the title compound. H atoms non-participating in hydrogen-bonding were omitted for clarity. [Symmetry codes: (i) - x + 1/2, y - 1/2 , - z + 3/2; (ii) x, y - 1, z; (iii) - x + 1/2, y + 1/2 , - z + 3/2; (iv) x, y + 1, z.]
2,5-Dimethyl-3-(2-methylphenylsulfinyl)-1-benzofuran top
Crystal data top
C17H16O2SF(000) = 600
Mr = 284.36Dx = 1.332 Mg m3
Monoclinic, P21/nMo Kα radiation, λ = 0.71073 Å
a = 10.8458 (2) ÅCell parameters from 9125 reflections
b = 8.0139 (1) Åθ = 2.5–28.1°
c = 16.4295 (2) ŵ = 0.23 mm1
β = 96.709 (1)°T = 173 K
V = 1418.23 (4) Å3Block, colourless
Z = 40.44 × 0.33 × 0.30 mm
Data collection top
Bruker SMART APEXII CCD
diffractometer
3529 independent reflections
Radiation source: rotating anode3091 reflections with I > 2σ(I)
Graphite multilayer monochromatorRint = 0.033
Detector resolution: 10.0 pixels mm-1θmax = 28.4°, θmin = 2.1°
φ and ω scansh = 1414
Absorption correction: multi-scan
(SADABS; Bruker, 2009)
k = 1010
Tmin = 0.692, Tmax = 0.746l = 2120
25176 measured reflections
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.037Hydrogen site location: difference Fourier map
wR(F2) = 0.103H-atom parameters constrained
S = 1.05 w = 1/[σ2(Fo2) + (0.0515P)2 + 0.5244P]
where P = (Fo2 + 2Fc2)/3
3529 reflections(Δ/σ)max = 0.001
184 parametersΔρmax = 0.30 e Å3
0 restraintsΔρmin = 0.27 e Å3
Crystal data top
C17H16O2SV = 1418.23 (4) Å3
Mr = 284.36Z = 4
Monoclinic, P21/nMo Kα radiation
a = 10.8458 (2) ŵ = 0.23 mm1
b = 8.0139 (1) ÅT = 173 K
c = 16.4295 (2) Å0.44 × 0.33 × 0.30 mm
β = 96.709 (1)°
Data collection top
Bruker SMART APEXII CCD
diffractometer
3529 independent reflections
Absorption correction: multi-scan
(SADABS; Bruker, 2009)
3091 reflections with I > 2σ(I)
Tmin = 0.692, Tmax = 0.746Rint = 0.033
25176 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0370 restraints
wR(F2) = 0.103H-atom parameters constrained
S = 1.05Δρmax = 0.30 e Å3
3529 reflectionsΔρmin = 0.27 e Å3
184 parameters
Special details top

Experimental. 1H NMR (δ p.p.m., CDCl3, 400 Hz): 8.35 (d, J = 7.88 Hz, 1H), 7.53–7.57 (m, 1H), 7.38–7.42 (m, 1H), 7.26 (d, J = 7.02 Hz, 1H), 7.15 (d, J = 7.52 Hz, 1H), 6.98–7.03 (m, 2H), 2.73 (s, 3H), 2.25 (s, 3H), 2.13 (s, 3H),

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
S10.17973 (3)0.37549 (4)0.52324 (2)0.02675 (11)
O10.17654 (10)0.24730 (14)0.75315 (6)0.0349 (2)
O20.21361 (11)0.55407 (13)0.51308 (6)0.0381 (3)
C10.21664 (12)0.31930 (17)0.62666 (8)0.0250 (3)
C20.33439 (12)0.30795 (16)0.67783 (8)0.0236 (3)
C30.45906 (12)0.33131 (16)0.66789 (8)0.0255 (3)
H30.48250.36190.61600.031*
C40.54881 (13)0.30933 (18)0.73475 (9)0.0307 (3)
C50.51194 (15)0.2614 (2)0.81059 (9)0.0363 (3)
H50.57400.24560.85570.044*
C60.38937 (16)0.23627 (19)0.82225 (9)0.0355 (3)
H60.36560.20310.87370.043*
C70.30345 (13)0.26225 (18)0.75471 (8)0.0287 (3)
C80.12638 (13)0.28335 (19)0.67489 (9)0.0304 (3)
C90.68418 (15)0.3366 (2)0.72713 (11)0.0434 (4)
H9A0.69410.36920.67080.065*
H9B0.73010.23310.74080.065*
H9C0.71650.42520.76480.065*
C100.01086 (15)0.2761 (3)0.65979 (11)0.0452 (4)
H10A0.03800.30870.60300.068*
H10B0.04660.35270.69720.068*
H10C0.03880.16220.66910.068*
C110.29473 (12)0.25559 (17)0.47850 (7)0.0236 (3)
C120.38520 (14)0.34425 (18)0.44408 (8)0.0297 (3)
H120.38930.46220.44930.036*
C130.46993 (15)0.2599 (2)0.40181 (9)0.0365 (3)
H130.53310.31970.37880.044*
C140.46160 (15)0.0895 (2)0.39362 (9)0.0363 (3)
H140.51830.03150.36390.044*
C150.37125 (14)0.00203 (19)0.42834 (9)0.0338 (3)
H150.36750.11590.42250.041*
C160.28551 (13)0.08234 (18)0.47168 (8)0.0285 (3)
C170.18974 (17)0.0156 (2)0.50997 (12)0.0464 (4)
H17A0.20830.01190.56980.070*
H17B0.19070.13180.49140.070*
H17C0.10750.03260.49380.070*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
S10.02608 (18)0.03273 (19)0.02139 (17)0.00435 (12)0.00261 (12)0.00056 (12)
O10.0357 (6)0.0446 (6)0.0266 (5)0.0031 (5)0.0128 (4)0.0039 (4)
O20.0555 (7)0.0288 (5)0.0317 (5)0.0098 (5)0.0130 (5)0.0029 (4)
C10.0253 (6)0.0285 (6)0.0219 (6)0.0001 (5)0.0053 (5)0.0000 (5)
C20.0290 (6)0.0229 (6)0.0194 (6)0.0002 (5)0.0046 (5)0.0003 (4)
C30.0266 (6)0.0280 (6)0.0220 (6)0.0007 (5)0.0026 (5)0.0005 (5)
C40.0314 (7)0.0304 (7)0.0292 (7)0.0008 (5)0.0014 (6)0.0019 (5)
C50.0433 (8)0.0393 (8)0.0238 (7)0.0031 (6)0.0064 (6)0.0009 (6)
C60.0515 (9)0.0353 (8)0.0198 (6)0.0018 (7)0.0052 (6)0.0032 (5)
C70.0331 (7)0.0312 (7)0.0230 (6)0.0009 (5)0.0084 (5)0.0008 (5)
C80.0289 (7)0.0362 (7)0.0275 (7)0.0020 (5)0.0089 (5)0.0005 (5)
C90.0293 (8)0.0558 (10)0.0424 (9)0.0019 (7)0.0066 (7)0.0019 (7)
C100.0281 (8)0.0646 (11)0.0451 (9)0.0056 (7)0.0132 (7)0.0002 (8)
C110.0245 (6)0.0286 (7)0.0171 (5)0.0019 (5)0.0003 (5)0.0007 (4)
C120.0344 (7)0.0309 (7)0.0249 (6)0.0023 (5)0.0073 (5)0.0004 (5)
C130.0363 (8)0.0450 (9)0.0304 (7)0.0001 (6)0.0128 (6)0.0006 (6)
C140.0373 (8)0.0457 (9)0.0263 (7)0.0124 (7)0.0049 (6)0.0039 (6)
C150.0418 (8)0.0299 (7)0.0285 (7)0.0069 (6)0.0015 (6)0.0039 (5)
C160.0313 (7)0.0300 (7)0.0232 (6)0.0014 (5)0.0011 (5)0.0005 (5)
C170.0526 (10)0.0321 (8)0.0570 (11)0.0126 (7)0.0168 (8)0.0016 (7)
Geometric parameters (Å, º) top
S1—O21.4918 (11)C9—H9B0.9800
S1—C11.7580 (13)C9—H9C0.9800
S1—C111.7982 (13)C10—H10A0.9800
O1—C81.3671 (18)C10—H10B0.9800
O1—C71.3789 (17)C10—H10C0.9800
C1—C81.3604 (18)C11—C121.3846 (19)
C1—C21.4476 (18)C11—C161.3955 (19)
C2—C71.3932 (17)C12—C131.390 (2)
C2—C31.3934 (18)C12—H120.9500
C3—C41.3912 (19)C13—C141.375 (2)
C3—H30.9500C13—H130.9500
C4—C51.406 (2)C14—C151.381 (2)
C4—C91.504 (2)C14—H140.9500
C5—C61.380 (2)C15—C161.393 (2)
C5—H50.9500C15—H150.9500
C6—C71.379 (2)C16—C171.498 (2)
C6—H60.9500C17—H17A0.9800
C8—C101.481 (2)C17—H17B0.9800
C9—H9A0.9800C17—H17C0.9800
O2—S1—C1108.82 (6)H9A—C9—H9C109.5
O2—S1—C11105.97 (6)H9B—C9—H9C109.5
C1—S1—C1199.66 (6)C8—C10—H10A109.5
C8—O1—C7106.61 (10)C8—C10—H10B109.5
C8—C1—C2107.12 (12)H10A—C10—H10B109.5
C8—C1—S1121.27 (11)C8—C10—H10C109.5
C2—C1—S1131.55 (10)H10A—C10—H10C109.5
C7—C2—C3118.78 (12)H10B—C10—H10C109.5
C7—C2—C1104.68 (11)C12—C11—C16121.69 (12)
C3—C2—C1136.54 (12)C12—C11—S1116.82 (10)
C4—C3—C2119.30 (13)C16—C11—S1121.19 (10)
C4—C3—H3120.3C11—C12—C13119.74 (14)
C2—C3—H3120.3C11—C12—H12120.1
C3—C4—C5119.29 (13)C13—C12—H12120.1
C3—C4—C9121.04 (14)C14—C13—C12119.48 (14)
C5—C4—C9119.67 (14)C14—C13—H13120.3
C6—C5—C4122.77 (13)C12—C13—H13120.3
C6—C5—H5118.6C13—C14—C15120.36 (14)
C4—C5—H5118.6C13—C14—H14119.8
C7—C6—C5115.96 (13)C15—C14—H14119.8
C7—C6—H6122.0C14—C15—C16121.67 (14)
C5—C6—H6122.0C14—C15—H15119.2
O1—C7—C6125.53 (13)C16—C15—H15119.2
O1—C7—C2110.59 (12)C15—C16—C11117.05 (13)
C6—C7—C2123.88 (14)C15—C16—C17120.63 (14)
C1—C8—O1110.99 (12)C11—C16—C17122.31 (13)
C1—C8—C10133.48 (14)C16—C17—H17A109.5
O1—C8—C10115.53 (12)C16—C17—H17B109.5
C4—C9—H9A109.5H17A—C17—H17B109.5
C4—C9—H9B109.5C16—C17—H17C109.5
H9A—C9—H9B109.5H17A—C17—H17C109.5
C4—C9—H9C109.5H17B—C17—H17C109.5
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
C6—H6···O2i0.952.453.3772 (18)166
C17—H17B···O2ii0.982.553.458 (2)154
Symmetry codes: (i) x+1/2, y1/2, z+3/2; (ii) x, y1, z.
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
C6—H6···O2i0.952.453.3772 (18)165.5
C17—H17B···O2ii0.982.553.458 (2)153.9
Symmetry codes: (i) x+1/2, y1/2, z+3/2; (ii) x, y1, z.
 

Acknowledgements

This work was supported by a Dongeui University Grant (2015AA019). The X-ray centre of the Gyeongsang National University is acknowledged for providing access to the single-crystal diffractometer.

References

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