organic compounds
1-(6-Fluoro-1,3-benzothiazol-2-yl)-3-phenyl-1H-pyrazole-4-carbaldehyde
aX-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia, bPharmaceutical Chemistry Division, School of Advanced Sciences, VIT University, Vellore 632 014, Tamil Nadu, India, and cDepartment of Chemistry, P. A. College of Engineering, Nadupadavu 574 153 D. K., Mangalore, India
*Correspondence e-mail: hkfun@usm.my
The 17H10FN3OS, consists of two crystallographically independent molecules. In one molecule, the pyrazole ring makes dihedral angles of 6.51 (7) and 34.02 (9)°, respectively, with the terminal 1,3-benzothiazole ring system and the phenyl ring, while in the other molecule these values are 6.41 (8) and 23.06 (9)°. In the crystal, the molecules are linked by weak π–π [centroid–centroid distance = 3.7069 (10) Å] and C—H⋯π interactions.
of the title compound, CRelated literature
For the biological activity of benzothiazole derivatives, see: Al-Soud et al. (2006); Kini et al. (2007); Munirajasekhar et al. (2011); Gurupadayya et al. (2008); Bowyer et al. (2007); Mittal et al. (2007); Rocío Pozas et al. (2005); Rana et al. (2008). For a related structure, see: Fun et al. (2011). For bond-length data, see: Allen et al. (1987).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2009); cell SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009).
Supporting information
https://doi.org/10.1107/S1600536811049634/is5013sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536811049634/is5013Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536811049634/is5013Isup3.cml
1-(6-Fluorobenzo[d]thiazol-2-yl)-2-(1-phenylethylidene)hydrazine was treated with Vilsmeier-Haack reagent (DMF/POCl3: 10:1.1 ml) and was stirred at 60–65 °C for 2.5 h. It was poured into cold water and the solid that separated out by neutralization with NaHCO3 was filtered, washed with water and was then purified by
The product was recrystallized from petroleum ether and ethyl acetate (80: 20) to yield block-shaped colorless crystals.All the H atoms were positioned geometrically (C—H = 0.93 Å) and refined using a riding model, with Uiso(H) = 1.2Ueq(C).
Benzothiazoles are very important bicyclic ring compounds which are of great interest because of their biological activities. The substituted benzothiazole derivatives have emerged as significant components in various diversified therapeutic applications. The literature review reveals that benzothiazoles and their derivatives show considerable activity including potent inhibition of human immunodeficiency virus type 1 (HIV-1) replication by HIV-1 protease inhibition (Al-Soud et al., 2006), antitumor (Kini et al., 2007), anthelmintic (Munirajasekhar et al., 2011) analgesic and anti-inflammatory (Gurupadayya et al., 2008), antimalarial (Bowyer et al., 2007), antifungal (Mittal et al., 2007), anticandidous (Rocío Pozas et al., 2005) as well as various CNS activities (Rana et al., 2008). The structure of 2-[5-(4-methoxyphenyl)-3-phenyl-4,5- dihydro-1H-pyrazol-1-yl]-6-methyl-1,3-benzothiazole has been reported by Fun et al. (2011). The present work describes the synthesis and
of the title compound, 1-(6-fluorobenzo-1,3-thiazol-2-yl)-3-phenyl-1H-pyrazole-4- carbaldehyde which was prepared from the reaction of 1-(6-fluoro-1,3-benzothiazol-2-yl)-2-(1-phenylethylidene)hydrazine treated with Vilsmeier-Haack reagent to obtain crystals of the title compound.The
of the title compound consists of two crystallographically independent molecules A and B as shown in Fig. 1. The pyrazole rings (N2A/N3A/C8A–C10A and N2B/N3B/C8B–C10B) are approximately planar with a maximum deviation of 0.002 (2) Å for atom C8A and 0.001 (2) Å for atom C9B. The central pyrazole (N2/N3/C8–C10) ring makes dihedral angles of 6.51 (7) and 34.02 (9)°, respectively, with the terminal benzo[d]thiazole ring (S1/N1/C1–C7) system and the phenyl ring (C11–C16) for molecule A. These values are 6.41 (8) and 23.06 (9)° for molecule B. The bond lengths (Allen et al., 1987) and angles are within normal ranges and are comparable to the related structure (Fun et al., 2011).In the π–π interaction between the thiazoline (S1A/N1A/C1A/C6A–C7A) and the phenyl ring (C11B–C16B) [centroid-to-centroid (-1 + x, y, z) distance = 3.7069 (10) Å]. The structure is further stabilized by C—H···π interactions, involving the centroid of phenyl ring (C11B–C16B; Cg4; Table 1).
(Fig. 2), no classical hydrogen bonds were observed and stabilization is provided by a weakFor the biological activity of benzothiazole derivatives, see: Al-Soud et al. (2006); Kini et al. (2007); Munirajasekhar et al. (2011); Gurupadayya et al. (2008); Bowyer et al. (2007); Mittal et al. (2007); Rocío Pozas et al. (2005); Rana et al. (2008). For a related structure, see: Fun et al. (2011). For bond-length data, see: Allen et al. (1987).
Data collection: APEX2 (Bruker, 2009); cell
SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).C17H10FN3OS | Z = 4 |
Mr = 323.34 | F(000) = 664 |
Triclinic, P1 | Dx = 1.494 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 8.0994 (3) Å | Cell parameters from 9988 reflections |
b = 13.6566 (4) Å | θ = 2.6–32.6° |
c = 13.8472 (5) Å | µ = 0.24 mm−1 |
α = 70.393 (1)° | T = 296 K |
β = 85.264 (1)° | Block, colourless |
γ = 89.069 (1)° | 0.50 × 0.42 × 0.23 mm |
V = 1437.80 (9) Å3 |
Bruker APEX DUO CCD area-detector diffractometer | 8251 independent reflections |
Radiation source: fine-focus sealed tube | 6347 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.024 |
φ and ω scans | θmax = 30.0°, θmin = 1.6° |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | h = −11→11 |
Tmin = 0.887, Tmax = 0.945 | k = −18→19 |
31117 measured reflections | l = −19→19 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.043 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.144 | H-atom parameters constrained |
S = 1.07 | w = 1/[σ2(Fo2) + (0.0724P)2 + 0.2771P] where P = (Fo2 + 2Fc2)/3 |
8251 reflections | (Δ/σ)max < 0.001 |
415 parameters | Δρmax = 0.31 e Å−3 |
0 restraints | Δρmin = −0.24 e Å−3 |
C17H10FN3OS | γ = 89.069 (1)° |
Mr = 323.34 | V = 1437.80 (9) Å3 |
Triclinic, P1 | Z = 4 |
a = 8.0994 (3) Å | Mo Kα radiation |
b = 13.6566 (4) Å | µ = 0.24 mm−1 |
c = 13.8472 (5) Å | T = 296 K |
α = 70.393 (1)° | 0.50 × 0.42 × 0.23 mm |
β = 85.264 (1)° |
Bruker APEX DUO CCD area-detector diffractometer | 8251 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | 6347 reflections with I > 2σ(I) |
Tmin = 0.887, Tmax = 0.945 | Rint = 0.024 |
31117 measured reflections |
R[F2 > 2σ(F2)] = 0.043 | 0 restraints |
wR(F2) = 0.144 | H-atom parameters constrained |
S = 1.07 | Δρmax = 0.31 e Å−3 |
8251 reflections | Δρmin = −0.24 e Å−3 |
415 parameters |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s 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 > σ(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. |
x | y | z | Uiso*/Ueq | ||
S1A | 0.67133 (5) | 0.82264 (3) | 0.08427 (3) | 0.04991 (12) | |
F1A | 0.35358 (17) | 0.50191 (10) | 0.07601 (10) | 0.0780 (4) | |
O1A | 0.7893 (3) | 1.00042 (13) | 0.48380 (11) | 0.0904 (5) | |
N1A | 0.57383 (16) | 0.74868 (9) | 0.27972 (9) | 0.0436 (3) | |
N2A | 0.72337 (16) | 0.90516 (9) | 0.23250 (9) | 0.0419 (3) | |
N3A | 0.79295 (16) | 0.98890 (9) | 0.15536 (9) | 0.0426 (3) | |
C1A | 0.51321 (18) | 0.68136 (10) | 0.23461 (11) | 0.0403 (3) | |
C2A | 0.4170 (2) | 0.59282 (12) | 0.28661 (13) | 0.0490 (3) | |
H2AA | 0.3889 | 0.5745 | 0.3569 | 0.059* | |
C3A | 0.3639 (2) | 0.53261 (12) | 0.23229 (14) | 0.0538 (4) | |
H3AA | 0.2994 | 0.4733 | 0.2653 | 0.065* | |
C4A | 0.4084 (2) | 0.56223 (13) | 0.12799 (14) | 0.0531 (4) | |
C5A | 0.5024 (2) | 0.64888 (13) | 0.07234 (13) | 0.0510 (4) | |
H5AA | 0.5294 | 0.6664 | 0.0020 | 0.061* | |
C6A | 0.55449 (18) | 0.70860 (11) | 0.12851 (11) | 0.0420 (3) | |
C7A | 0.65299 (18) | 0.82331 (11) | 0.20963 (11) | 0.0404 (3) | |
C8A | 0.72749 (19) | 0.91363 (12) | 0.32581 (11) | 0.0446 (3) | |
H8AA | 0.6862 | 0.8657 | 0.3881 | 0.054* | |
C9A | 0.80446 (19) | 1.00673 (11) | 0.31171 (11) | 0.0439 (3) | |
C10A | 0.84341 (18) | 1.05089 (11) | 0.20331 (11) | 0.0406 (3) | |
C11A | 0.92322 (19) | 1.15176 (11) | 0.14425 (11) | 0.0416 (3) | |
C12A | 0.8739 (2) | 1.20843 (12) | 0.04738 (11) | 0.0473 (3) | |
H12A | 0.7925 | 1.1817 | 0.0193 | 0.057* | |
C13A | 0.9459 (2) | 1.30451 (13) | −0.00723 (13) | 0.0537 (4) | |
H13A | 0.9144 | 1.3414 | −0.0725 | 0.064* | |
C14A | 1.0642 (2) | 1.34576 (13) | 0.03492 (14) | 0.0561 (4) | |
H14A | 1.1100 | 1.4111 | −0.0012 | 0.067* | |
C15A | 1.1144 (2) | 1.29020 (13) | 0.13046 (14) | 0.0557 (4) | |
H15A | 1.1949 | 1.3178 | 0.1584 | 0.067* | |
C16A | 1.0452 (2) | 1.19319 (12) | 0.18507 (13) | 0.0497 (3) | |
H16A | 1.0804 | 1.1556 | 0.2492 | 0.060* | |
C17A | 0.8236 (3) | 1.04889 (15) | 0.39380 (14) | 0.0595 (4) | |
H17A | 0.8642 | 1.1165 | 0.3762 | 0.071* | |
S1B | 0.85368 (6) | 0.49438 (3) | 0.24460 (3) | 0.05176 (12) | |
F1B | 0.50654 (18) | 0.19249 (10) | 0.22056 (12) | 0.0855 (4) | |
O1B | 0.8877 (2) | 0.71038 (14) | 0.62541 (10) | 0.0816 (5) | |
N1B | 0.71374 (18) | 0.43506 (10) | 0.43233 (10) | 0.0501 (3) | |
N2B | 0.88353 (17) | 0.58379 (10) | 0.38940 (10) | 0.0473 (3) | |
N3B | 0.98472 (17) | 0.65462 (10) | 0.31604 (10) | 0.0463 (3) | |
C1B | 0.65907 (19) | 0.36730 (12) | 0.38591 (12) | 0.0470 (3) | |
C2B | 0.5465 (2) | 0.28536 (14) | 0.43263 (15) | 0.0589 (4) | |
H2BA | 0.5057 | 0.2707 | 0.5008 | 0.071* | |
C3B | 0.4968 (2) | 0.22667 (14) | 0.37629 (17) | 0.0644 (5) | |
H3BA | 0.4220 | 0.1718 | 0.4060 | 0.077* | |
C4B | 0.5595 (2) | 0.25033 (14) | 0.27492 (17) | 0.0613 (4) | |
C5B | 0.6719 (2) | 0.32944 (13) | 0.22546 (15) | 0.0557 (4) | |
H5BA | 0.7124 | 0.3430 | 0.1574 | 0.067* | |
C6B | 0.72117 (19) | 0.38764 (11) | 0.28344 (12) | 0.0470 (3) | |
C7B | 0.8123 (2) | 0.50277 (12) | 0.36636 (11) | 0.0456 (3) | |
C8B | 0.8587 (2) | 0.60645 (13) | 0.47682 (12) | 0.0510 (4) | |
H8BA | 0.7943 | 0.5685 | 0.5360 | 0.061* | |
C9B | 0.9459 (2) | 0.69574 (12) | 0.46208 (11) | 0.0471 (3) | |
C10B | 1.02340 (19) | 0.72353 (12) | 0.35926 (11) | 0.0435 (3) | |
C11B | 1.12870 (19) | 0.81364 (11) | 0.30056 (11) | 0.0429 (3) | |
C12B | 1.1391 (2) | 0.84764 (13) | 0.19371 (12) | 0.0515 (4) | |
H12B | 1.0808 | 0.8123 | 0.1602 | 0.062* | |
C13B | 1.2353 (3) | 0.93346 (14) | 0.13668 (13) | 0.0596 (4) | |
H13B | 1.2417 | 0.9551 | 0.0652 | 0.072* | |
C14B | 1.3220 (2) | 0.98730 (13) | 0.18518 (14) | 0.0571 (4) | |
H14B | 1.3867 | 1.0450 | 0.1467 | 0.069* | |
C15B | 1.3118 (2) | 0.95467 (14) | 0.29113 (14) | 0.0561 (4) | |
H15B | 1.3683 | 0.9913 | 0.3242 | 0.067* | |
C16B | 1.2181 (2) | 0.86785 (14) | 0.34855 (13) | 0.0516 (4) | |
H16B | 1.2148 | 0.8454 | 0.4200 | 0.062* | |
C17B | 0.9424 (2) | 0.74922 (16) | 0.53715 (13) | 0.0588 (4) | |
H17B | 0.9844 | 0.8168 | 0.5160 | 0.071* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1A | 0.0640 (3) | 0.0439 (2) | 0.03977 (19) | −0.01902 (16) | 0.00701 (16) | −0.01313 (15) |
F1A | 0.0888 (9) | 0.0728 (7) | 0.0857 (8) | −0.0342 (6) | 0.0022 (6) | −0.0449 (6) |
O1A | 0.1431 (16) | 0.0870 (11) | 0.0442 (7) | −0.0231 (10) | −0.0030 (8) | −0.0259 (7) |
N1A | 0.0500 (7) | 0.0381 (6) | 0.0409 (6) | −0.0074 (5) | 0.0011 (5) | −0.0118 (5) |
N2A | 0.0480 (7) | 0.0372 (6) | 0.0393 (6) | −0.0097 (5) | 0.0003 (5) | −0.0117 (5) |
N3A | 0.0519 (7) | 0.0356 (6) | 0.0389 (6) | −0.0107 (5) | 0.0024 (5) | −0.0115 (5) |
C1A | 0.0415 (7) | 0.0334 (6) | 0.0437 (7) | −0.0043 (5) | 0.0005 (5) | −0.0106 (5) |
C2A | 0.0535 (9) | 0.0396 (7) | 0.0485 (8) | −0.0103 (6) | 0.0061 (6) | −0.0098 (6) |
C3A | 0.0513 (9) | 0.0413 (8) | 0.0653 (10) | −0.0146 (6) | 0.0036 (7) | −0.0143 (7) |
C4A | 0.0516 (9) | 0.0478 (8) | 0.0667 (10) | −0.0104 (7) | −0.0039 (7) | −0.0279 (8) |
C5A | 0.0564 (9) | 0.0506 (8) | 0.0479 (8) | −0.0113 (7) | 0.0011 (7) | −0.0199 (7) |
C6A | 0.0449 (7) | 0.0376 (7) | 0.0423 (7) | −0.0069 (5) | 0.0013 (5) | −0.0127 (5) |
C7A | 0.0441 (7) | 0.0365 (6) | 0.0403 (7) | −0.0054 (5) | −0.0003 (5) | −0.0130 (5) |
C8A | 0.0508 (8) | 0.0418 (7) | 0.0390 (7) | −0.0071 (6) | −0.0019 (6) | −0.0106 (6) |
C9A | 0.0511 (8) | 0.0423 (7) | 0.0395 (7) | −0.0059 (6) | −0.0036 (6) | −0.0148 (6) |
C10A | 0.0447 (7) | 0.0360 (6) | 0.0414 (7) | −0.0047 (5) | −0.0011 (5) | −0.0139 (5) |
C11A | 0.0476 (8) | 0.0350 (6) | 0.0433 (7) | −0.0061 (5) | 0.0027 (5) | −0.0158 (5) |
C12A | 0.0548 (9) | 0.0464 (8) | 0.0422 (7) | −0.0091 (6) | −0.0001 (6) | −0.0174 (6) |
C13A | 0.0658 (10) | 0.0469 (8) | 0.0436 (8) | −0.0075 (7) | 0.0023 (7) | −0.0100 (6) |
C14A | 0.0666 (10) | 0.0429 (8) | 0.0555 (9) | −0.0155 (7) | 0.0095 (7) | −0.0150 (7) |
C15A | 0.0569 (10) | 0.0516 (9) | 0.0602 (10) | −0.0178 (7) | 0.0006 (7) | −0.0211 (8) |
C16A | 0.0547 (9) | 0.0441 (8) | 0.0501 (8) | −0.0100 (6) | −0.0060 (7) | −0.0147 (6) |
C17A | 0.0771 (12) | 0.0576 (10) | 0.0486 (9) | −0.0107 (8) | −0.0045 (8) | −0.0238 (8) |
S1B | 0.0601 (2) | 0.0447 (2) | 0.0457 (2) | −0.01154 (16) | 0.01026 (16) | −0.01161 (16) |
F1B | 0.0844 (9) | 0.0729 (8) | 0.1136 (11) | −0.0191 (6) | −0.0036 (7) | −0.0501 (7) |
O1B | 0.0912 (11) | 0.1110 (12) | 0.0449 (7) | −0.0069 (9) | 0.0001 (7) | −0.0300 (7) |
N1B | 0.0538 (8) | 0.0477 (7) | 0.0411 (7) | −0.0078 (6) | 0.0009 (5) | −0.0055 (5) |
N2B | 0.0536 (7) | 0.0438 (7) | 0.0395 (6) | −0.0079 (5) | 0.0017 (5) | −0.0082 (5) |
N3B | 0.0508 (7) | 0.0423 (6) | 0.0416 (6) | −0.0077 (5) | 0.0038 (5) | −0.0100 (5) |
C1B | 0.0436 (8) | 0.0418 (7) | 0.0485 (8) | −0.0033 (6) | −0.0005 (6) | −0.0064 (6) |
C2B | 0.0522 (9) | 0.0516 (9) | 0.0618 (10) | −0.0110 (7) | 0.0068 (7) | −0.0064 (8) |
C3B | 0.0509 (10) | 0.0503 (9) | 0.0847 (13) | −0.0122 (7) | 0.0045 (8) | −0.0147 (9) |
C4B | 0.0535 (10) | 0.0500 (9) | 0.0849 (13) | −0.0030 (7) | −0.0055 (9) | −0.0284 (9) |
C5B | 0.0569 (10) | 0.0497 (9) | 0.0614 (10) | −0.0032 (7) | 0.0031 (7) | −0.0217 (8) |
C6B | 0.0461 (8) | 0.0388 (7) | 0.0506 (8) | −0.0020 (6) | 0.0022 (6) | −0.0093 (6) |
C7B | 0.0476 (8) | 0.0416 (7) | 0.0416 (7) | −0.0036 (6) | −0.0012 (6) | −0.0064 (6) |
C8B | 0.0564 (9) | 0.0551 (9) | 0.0362 (7) | −0.0053 (7) | −0.0006 (6) | −0.0087 (6) |
C9B | 0.0497 (8) | 0.0508 (8) | 0.0371 (7) | −0.0019 (6) | −0.0037 (6) | −0.0097 (6) |
C10B | 0.0444 (7) | 0.0441 (7) | 0.0395 (7) | −0.0004 (6) | −0.0023 (5) | −0.0110 (6) |
C11B | 0.0448 (7) | 0.0405 (7) | 0.0432 (7) | −0.0016 (5) | −0.0007 (5) | −0.0141 (6) |
C12B | 0.0639 (10) | 0.0483 (8) | 0.0436 (8) | −0.0104 (7) | 0.0013 (7) | −0.0182 (6) |
C13B | 0.0790 (12) | 0.0520 (9) | 0.0446 (9) | −0.0138 (8) | 0.0043 (8) | −0.0134 (7) |
C14B | 0.0620 (10) | 0.0462 (8) | 0.0606 (10) | −0.0116 (7) | 0.0028 (8) | −0.0157 (7) |
C15B | 0.0537 (9) | 0.0565 (9) | 0.0639 (10) | −0.0101 (7) | −0.0042 (7) | −0.0274 (8) |
C16B | 0.0532 (9) | 0.0570 (9) | 0.0458 (8) | −0.0044 (7) | −0.0055 (6) | −0.0182 (7) |
C17B | 0.0604 (10) | 0.0719 (11) | 0.0472 (9) | −0.0051 (8) | −0.0039 (7) | −0.0241 (8) |
S1A—C7A | 1.7331 (15) | S1B—C6B | 1.7307 (16) |
S1A—C6A | 1.7344 (14) | S1B—C7B | 1.7330 (16) |
F1A—C4A | 1.3626 (18) | F1B—C4B | 1.356 (2) |
O1A—C17A | 1.210 (2) | O1B—C17B | 1.206 (2) |
N1A—C7A | 1.2831 (17) | N1B—C7B | 1.2896 (19) |
N1A—C1A | 1.3882 (18) | N1B—C1B | 1.387 (2) |
N2A—C8A | 1.3385 (19) | N2B—C8B | 1.346 (2) |
N2A—N3A | 1.3667 (15) | N2B—N3B | 1.3668 (16) |
N2A—C7A | 1.4010 (18) | N2B—C7B | 1.395 (2) |
N3A—C10A | 1.3258 (18) | N3B—C10B | 1.327 (2) |
C1A—C2A | 1.3934 (19) | C1B—C2B | 1.397 (2) |
C1A—C6A | 1.402 (2) | C1B—C6B | 1.402 (2) |
C2A—C3A | 1.381 (2) | C2B—C3B | 1.377 (3) |
C2A—H2AA | 0.9300 | C2B—H2BA | 0.9300 |
C3A—C4A | 1.381 (2) | C3B—C4B | 1.384 (3) |
C3A—H3AA | 0.9300 | C3B—H3BA | 0.9300 |
C4A—C5A | 1.376 (2) | C4B—C5B | 1.378 (2) |
C5A—C6A | 1.393 (2) | C5B—C6B | 1.388 (2) |
C5A—H5AA | 0.9300 | C5B—H5BA | 0.9300 |
C8A—C9A | 1.372 (2) | C8B—C9B | 1.366 (2) |
C8A—H8AA | 0.9300 | C8B—H8BA | 0.9300 |
C9A—C10A | 1.427 (2) | C9B—C10B | 1.436 (2) |
C9A—C17A | 1.456 (2) | C9B—C17B | 1.456 (2) |
C10A—C11A | 1.4730 (19) | C10B—C11B | 1.467 (2) |
C11A—C12A | 1.393 (2) | C11B—C12B | 1.390 (2) |
C11A—C16A | 1.393 (2) | C11B—C16B | 1.393 (2) |
C12A—C13A | 1.385 (2) | C12B—C13B | 1.382 (2) |
C12A—H12A | 0.9300 | C12B—H12B | 0.9300 |
C13A—C14A | 1.381 (3) | C13B—C14B | 1.383 (2) |
C13A—H13A | 0.9300 | C13B—H13B | 0.9300 |
C14A—C15A | 1.377 (3) | C14B—C15B | 1.378 (3) |
C14A—H14A | 0.9300 | C14B—H14B | 0.9300 |
C15A—C16A | 1.387 (2) | C15B—C16B | 1.382 (2) |
C15A—H15A | 0.9300 | C15B—H15B | 0.9300 |
C16A—H16A | 0.9300 | C16B—H16B | 0.9300 |
C17A—H17A | 0.9300 | C17B—H17B | 0.9300 |
C7A—S1A—C6A | 87.24 (7) | C6B—S1B—C7B | 87.38 (7) |
C7A—N1A—C1A | 108.70 (12) | C7B—N1B—C1B | 108.42 (13) |
C8A—N2A—N3A | 113.04 (12) | C8B—N2B—N3B | 112.64 (13) |
C8A—N2A—C7A | 126.58 (12) | C8B—N2B—C7B | 127.64 (13) |
N3A—N2A—C7A | 120.35 (11) | N3B—N2B—C7B | 119.62 (13) |
C10A—N3A—N2A | 104.40 (11) | C10B—N3B—N2B | 104.84 (12) |
N1A—C1A—C2A | 124.95 (13) | N1B—C1B—C2B | 124.95 (15) |
N1A—C1A—C6A | 114.96 (12) | N1B—C1B—C6B | 115.21 (13) |
C2A—C1A—C6A | 120.08 (14) | C2B—C1B—C6B | 119.80 (16) |
C3A—C2A—C1A | 119.11 (15) | C3B—C2B—C1B | 119.08 (17) |
C3A—C2A—H2AA | 120.4 | C3B—C2B—H2BA | 120.5 |
C1A—C2A—H2AA | 120.4 | C1B—C2B—H2BA | 120.5 |
C2A—C3A—C4A | 118.72 (14) | C2B—C3B—C4B | 119.22 (16) |
C2A—C3A—H3AA | 120.6 | C2B—C3B—H3BA | 120.4 |
C4A—C3A—H3AA | 120.6 | C4B—C3B—H3BA | 120.4 |
F1A—C4A—C5A | 117.53 (16) | F1B—C4B—C5B | 117.80 (18) |
F1A—C4A—C3A | 117.59 (14) | F1B—C4B—C3B | 118.10 (17) |
C5A—C4A—C3A | 124.87 (15) | C5B—C4B—C3B | 124.10 (18) |
C4A—C5A—C6A | 115.49 (15) | C4B—C5B—C6B | 115.96 (17) |
C4A—C5A—H5AA | 122.3 | C4B—C5B—H5BA | 122.0 |
C6A—C5A—H5AA | 122.3 | C6B—C5B—H5BA | 122.0 |
C5A—C6A—C1A | 121.72 (13) | C5B—C6B—C1B | 121.84 (15) |
C5A—C6A—S1A | 128.22 (12) | C5B—C6B—S1B | 128.06 (13) |
C1A—C6A—S1A | 110.06 (10) | C1B—C6B—S1B | 110.06 (12) |
N1A—C7A—N2A | 121.30 (13) | N1B—C7B—N2B | 121.97 (15) |
N1A—C7A—S1A | 119.01 (11) | N1B—C7B—S1B | 118.92 (13) |
N2A—C7A—S1A | 119.69 (10) | N2B—C7B—S1B | 119.10 (11) |
N2A—C8A—C9A | 106.68 (13) | N2B—C8B—C9B | 106.95 (14) |
N2A—C8A—H8AA | 126.7 | N2B—C8B—H8BA | 126.5 |
C9A—C8A—H8AA | 126.7 | C9B—C8B—H8BA | 126.5 |
C8A—C9A—C10A | 105.00 (13) | C8B—C9B—C10B | 105.11 (14) |
C8A—C9A—C17A | 124.08 (14) | C8B—C9B—C17B | 123.68 (15) |
C10A—C9A—C17A | 130.72 (14) | C10B—C9B—C17B | 131.06 (15) |
N3A—C10A—C9A | 110.88 (12) | N3B—C10B—C9B | 110.46 (13) |
N3A—C10A—C11A | 120.38 (12) | N3B—C10B—C11B | 119.89 (13) |
C9A—C10A—C11A | 128.72 (13) | C9B—C10B—C11B | 129.63 (14) |
C12A—C11A—C16A | 119.04 (13) | C12B—C11B—C16B | 118.35 (14) |
C12A—C11A—C10A | 120.05 (13) | C12B—C11B—C10B | 119.60 (14) |
C16A—C11A—C10A | 120.88 (14) | C16B—C11B—C10B | 122.04 (14) |
C13A—C12A—C11A | 120.16 (15) | C13B—C12B—C11B | 120.69 (15) |
C13A—C12A—H12A | 119.9 | C13B—C12B—H12B | 119.7 |
C11A—C12A—H12A | 119.9 | C11B—C12B—H12B | 119.7 |
C14A—C13A—C12A | 120.28 (16) | C12B—C13B—C14B | 120.43 (16) |
C14A—C13A—H13A | 119.9 | C12B—C13B—H13B | 119.8 |
C12A—C13A—H13A | 119.9 | C14B—C13B—H13B | 119.8 |
C15A—C14A—C13A | 120.04 (15) | C15B—C14B—C13B | 119.39 (16) |
C15A—C14A—H14A | 120.0 | C15B—C14B—H14B | 120.3 |
C13A—C14A—H14A | 120.0 | C13B—C14B—H14B | 120.3 |
C14A—C15A—C16A | 120.16 (16) | C14B—C15B—C16B | 120.42 (16) |
C14A—C15A—H15A | 119.9 | C14B—C15B—H15B | 119.8 |
C16A—C15A—H15A | 119.9 | C16B—C15B—H15B | 119.8 |
C15A—C16A—C11A | 120.30 (15) | C15B—C16B—C11B | 120.69 (15) |
C15A—C16A—H16A | 119.9 | C15B—C16B—H16B | 119.7 |
C11A—C16A—H16A | 119.9 | C11B—C16B—H16B | 119.7 |
O1A—C17A—C9A | 123.28 (17) | O1B—C17B—C9B | 123.33 (19) |
O1A—C17A—H17A | 118.4 | O1B—C17B—H17B | 118.3 |
C9A—C17A—H17A | 118.4 | C9B—C17B—H17B | 118.3 |
C8A—N2A—N3A—C10A | 0.64 (17) | C8B—N2B—N3B—C10B | −0.18 (18) |
C7A—N2A—N3A—C10A | 178.86 (13) | C7B—N2B—N3B—C10B | 176.45 (14) |
C7A—N1A—C1A—C2A | −178.13 (15) | C7B—N1B—C1B—C2B | −177.98 (16) |
C7A—N1A—C1A—C6A | 1.36 (19) | C7B—N1B—C1B—C6B | 0.1 (2) |
N1A—C1A—C2A—C3A | 179.70 (15) | N1B—C1B—C2B—C3B | 177.10 (16) |
C6A—C1A—C2A—C3A | 0.2 (2) | C6B—C1B—C2B—C3B | −0.9 (3) |
C1A—C2A—C3A—C4A | 0.1 (3) | C1B—C2B—C3B—C4B | 0.0 (3) |
C2A—C3A—C4A—F1A | −179.57 (16) | C2B—C3B—C4B—F1B | −178.94 (17) |
C2A—C3A—C4A—C5A | −0.4 (3) | C2B—C3B—C4B—C5B | 0.8 (3) |
F1A—C4A—C5A—C6A | 179.47 (15) | F1B—C4B—C5B—C6B | 179.16 (16) |
C3A—C4A—C5A—C6A | 0.3 (3) | C3B—C4B—C5B—C6B | −0.5 (3) |
C4A—C5A—C6A—C1A | 0.1 (2) | C4B—C5B—C6B—C1B | −0.4 (3) |
C4A—C5A—C6A—S1A | −179.15 (13) | C4B—C5B—C6B—S1B | −177.55 (14) |
N1A—C1A—C6A—C5A | −179.85 (15) | N1B—C1B—C6B—C5B | −177.06 (15) |
C2A—C1A—C6A—C5A | −0.3 (2) | C2B—C1B—C6B—C5B | 1.1 (2) |
N1A—C1A—C6A—S1A | −0.51 (17) | N1B—C1B—C6B—S1B | 0.56 (18) |
C2A—C1A—C6A—S1A | 179.01 (12) | C2B—C1B—C6B—S1B | 178.70 (13) |
C7A—S1A—C6A—C5A | 178.96 (16) | C7B—S1B—C6B—C5B | 176.70 (17) |
C7A—S1A—C6A—C1A | −0.33 (11) | C7B—S1B—C6B—C1B | −0.73 (12) |
C1A—N1A—C7A—N2A | 177.85 (13) | C1B—N1B—C7B—N2B | 177.88 (14) |
C1A—N1A—C7A—S1A | −1.70 (17) | C1B—N1B—C7B—S1B | −0.70 (19) |
C8A—N2A—C7A—N1A | 4.4 (2) | C8B—N2B—C7B—N1B | −2.7 (3) |
N3A—N2A—C7A—N1A | −173.56 (13) | N3B—N2B—C7B—N1B | −178.78 (15) |
C8A—N2A—C7A—S1A | −176.06 (12) | C8B—N2B—C7B—S1B | 175.86 (13) |
N3A—N2A—C7A—S1A | 5.98 (19) | N3B—N2B—C7B—S1B | −0.2 (2) |
C6A—S1A—C7A—N1A | 1.24 (13) | C6B—S1B—C7B—N1B | 0.88 (14) |
C6A—S1A—C7A—N2A | −178.32 (13) | C6B—S1B—C7B—N2B | −177.74 (14) |
N3A—N2A—C8A—C9A | −0.53 (18) | N3B—N2B—C8B—C9B | 0.05 (19) |
C7A—N2A—C8A—C9A | −178.62 (15) | C7B—N2B—C8B—C9B | −176.25 (15) |
N2A—C8A—C9A—C10A | 0.20 (17) | N2B—C8B—C9B—C10B | 0.10 (18) |
N2A—C8A—C9A—C17A | 175.54 (16) | N2B—C8B—C9B—C17B | 176.03 (16) |
N2A—N3A—C10A—C9A | −0.49 (17) | N2B—N3B—C10B—C9B | 0.24 (17) |
N2A—N3A—C10A—C11A | −178.81 (13) | N2B—N3B—C10B—C11B | −178.39 (13) |
C8A—C9A—C10A—N3A | 0.19 (18) | C8B—C9B—C10B—N3B | −0.22 (19) |
C17A—C9A—C10A—N3A | −174.72 (17) | C17B—C9B—C10B—N3B | −175.73 (17) |
C8A—C9A—C10A—C11A | 178.33 (15) | C8B—C9B—C10B—C11B | 178.24 (16) |
C17A—C9A—C10A—C11A | 3.4 (3) | C17B—C9B—C10B—C11B | 2.7 (3) |
N3A—C10A—C11A—C12A | 34.0 (2) | N3B—C10B—C11B—C12B | 22.9 (2) |
C9A—C10A—C11A—C12A | −143.94 (16) | C9B—C10B—C11B—C12B | −155.43 (17) |
N3A—C10A—C11A—C16A | −147.70 (15) | N3B—C10B—C11B—C16B | −157.91 (16) |
C9A—C10A—C11A—C16A | 34.3 (2) | C9B—C10B—C11B—C16B | 23.8 (3) |
C16A—C11A—C12A—C13A | 0.1 (2) | C16B—C11B—C12B—C13B | −0.3 (3) |
C10A—C11A—C12A—C13A | 178.39 (14) | C10B—C11B—C12B—C13B | 178.89 (16) |
C11A—C12A—C13A—C14A | −1.5 (3) | C11B—C12B—C13B—C14B | −0.4 (3) |
C12A—C13A—C14A—C15A | 1.7 (3) | C12B—C13B—C14B—C15B | 0.0 (3) |
C13A—C14A—C15A—C16A | −0.7 (3) | C13B—C14B—C15B—C16B | 1.1 (3) |
C14A—C15A—C16A—C11A | −0.7 (3) | C14B—C15B—C16B—C11B | −1.9 (3) |
C12A—C11A—C16A—C15A | 1.0 (2) | C12B—C11B—C16B—C15B | 1.4 (3) |
C10A—C11A—C16A—C15A | −177.30 (15) | C10B—C11B—C16B—C15B | −177.75 (15) |
C8A—C9A—C17A—O1A | 8.3 (3) | C8B—C9B—C17B—O1B | 14.1 (3) |
C10A—C9A—C17A—O1A | −177.6 (2) | C10B—C9B—C17B—O1B | −171.10 (19) |
Cg4 is the centroid of the C11B–C16B ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C5B—H5BA···Cg4i | 0.93 | 2.85 | 3.4757 (19) | 126 |
Symmetry code: (i) x, y−1, z. |
Experimental details
Crystal data | |
Chemical formula | C17H10FN3OS |
Mr | 323.34 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 296 |
a, b, c (Å) | 8.0994 (3), 13.6566 (4), 13.8472 (5) |
α, β, γ (°) | 70.393 (1), 85.264 (1), 89.069 (1) |
V (Å3) | 1437.80 (9) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.24 |
Crystal size (mm) | 0.50 × 0.42 × 0.23 |
Data collection | |
Diffractometer | Bruker APEX DUO CCD area-detector |
Absorption correction | Multi-scan (SADABS; Bruker, 2009) |
Tmin, Tmax | 0.887, 0.945 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 31117, 8251, 6347 |
Rint | 0.024 |
(sin θ/λ)max (Å−1) | 0.703 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.043, 0.144, 1.07 |
No. of reflections | 8251 |
No. of parameters | 415 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.31, −0.24 |
Computer programs: APEX2 (Bruker, 2009), SAINT (Bruker, 2009), SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).
Cg4 is the centroid of the C11B–C16B ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C5B—H5BA···Cg4i | 0.93 | 2.85 | 3.4757 (19) | 126 |
Symmetry code: (i) x, y−1, z. |
Footnotes
‡Thomson Reuters ResearcherID: A-3561-2009.
Acknowledgements
HKF and CWO thank Universiti Sains Malaysia (USM) for the Research University Grant (1001/PFIZIK/811160). CWO also thanks the Malaysian Government and USM for the award of the post of research assistant under the Research University Grant (1001/PFIZIK/811151). HM gratefully acknowledges the School of Advanced Sciences, VIT University, Vellore, for providing facilities to carry out research.
References
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
Benzothiazoles are very important bicyclic ring compounds which are of great interest because of their biological activities. The substituted benzothiazole derivatives have emerged as significant components in various diversified therapeutic applications. The literature review reveals that benzothiazoles and their derivatives show considerable activity including potent inhibition of human immunodeficiency virus type 1 (HIV-1) replication by HIV-1 protease inhibition (Al-Soud et al., 2006), antitumor (Kini et al., 2007), anthelmintic (Munirajasekhar et al., 2011) analgesic and anti-inflammatory (Gurupadayya et al., 2008), antimalarial (Bowyer et al., 2007), antifungal (Mittal et al., 2007), anticandidous (Rocío Pozas et al., 2005) as well as various CNS activities (Rana et al., 2008). The structure of 2-[5-(4-methoxyphenyl)-3-phenyl-4,5- dihydro-1H-pyrazol-1-yl]-6-methyl-1,3-benzothiazole has been reported by Fun et al. (2011). The present work describes the synthesis and crystal structure of the title compound, 1-(6-fluorobenzo-1,3-thiazol-2-yl)-3-phenyl-1H-pyrazole-4- carbaldehyde which was prepared from the reaction of 1-(6-fluoro-1,3-benzothiazol-2-yl)-2-(1-phenylethylidene)hydrazine treated with Vilsmeier-Haack reagent to obtain crystals of the title compound.
The asymmetric unit of the title compound consists of two crystallographically independent molecules A and B as shown in Fig. 1. The pyrazole rings (N2A/N3A/C8A–C10A and N2B/N3B/C8B–C10B) are approximately planar with a maximum deviation of 0.002 (2) Å for atom C8A and 0.001 (2) Å for atom C9B. The central pyrazole (N2/N3/C8–C10) ring makes dihedral angles of 6.51 (7) and 34.02 (9)°, respectively, with the terminal benzo[d]thiazole ring (S1/N1/C1–C7) system and the phenyl ring (C11–C16) for molecule A. These values are 6.41 (8) and 23.06 (9)° for molecule B. The bond lengths (Allen et al., 1987) and angles are within normal ranges and are comparable to the related structure (Fun et al., 2011).
In the crystal structure (Fig. 2), no classical hydrogen bonds were observed and stabilization is provided by a weak π–π interaction between the thiazoline (S1A/N1A/C1A/C6A–C7A) and the phenyl ring (C11B–C16B) [centroid-to-centroid (-1 + x, y, z) distance = 3.7069 (10) Å]. The structure is further stabilized by C—H···π interactions, involving the centroid of phenyl ring (C11B–C16B; Cg4; Table 1).