organic compounds
3-Oxo-N′,2-diphenyl-2,3-dihydro-1H-pyrazole-4-carbohydrazide
aDepartment of Chemistry, Tulane University, New Orleans, LA 70118, USA, bChemistry and Environmental Division, Manchester Metropolitan University, Manchester M1 5GD, England, cChemistry Department, Faculty of Science, Minia University, 61519 El-Minia, Egypt, dDepartment of Physics, Faculty of Sciences, Erciyes University, 38039 Kayseri, Turkey, eChemistry Department, Faculty of Science, Sohag University, 61519 Sohag, Egypt, and fKirkuk University, College of Science, Department of Chemistry, Kirkuk, Iraq
*Correspondence e-mail: shaabankamel@yahoo.com
In the title compound, C16H14N4O2, the pyrazole ring makes a dihedral angle of 10.49 (8)° with its N-bound phenyl group, while it is nearly perpendicular to the other phenyl ring [dihedral angle = 88.47 (5)°]. The molecular conformation is stabilized by intramolecular C—H⋯O and N—H⋯O hydrogen bonds. In the crystal, the packing involves sheets of molecules parallel to (100) linked by N—H⋯O hydrogen bonds. A C—H⋯O interaction is also observed.
CCDC reference: 1005600
Related literature
For the diverse biological activities of pyrazolone compounds, see: Guckian et al. (2010); Fan et al. (2006); Castagnolo et al. (2008); Idrees et al. (2009); Abdel-Aziz et al. (2009); Manojkumar et al. (2009); Shete et al. (2011); Sujatha et al. (2009); El-Hawash et al. (2006); Kawai et al. (1997); Wu et al. (20026). For industrial applications of pyrazolones, see: Basaif et al. (2007); Ho (2005); Kirschke et al. (1984); Chande et al. (1993); El-Saraf & El-Sayed (2003). For graph-set motif notation, see: Bernstein et al. (1995).
Experimental
Crystal data
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Data collection: APEX2 (Bruker, 2013); cell SAINT (Bruker, 2013); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg & Putz, 2012); software used to prepare material for publication: SHELXTL.
Supporting information
CCDC reference: 1005600
https://doi.org/10.1107/S1600536814012392/bt6982sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536814012392/bt6982Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536814012392/bt6982Isup3.cml
A mixture of 10 mmol (2.31 g) of 4-[(dimethylamino)methylene]-1-phenylpyrazolidine-3,5-dione and 10 mmol (1.08 g) of phenyl hydrazine in 15 ml dioxane was refluxed for 6 h. After cooling, the resulting solid was collected by filtration and recrystallized from ethanol. Colourless crystals, 84%, m.p. = 483 K.
H-atoms attached to carbon were placed in calculated positions (C—H = 0.95 Å) while those attached to nitrogen were placed in locations derived from a difference map and initially refined to check their identity following which their coordinates adjusted to give N—H = 0.91 Å. All were then included as riding contributions with isotropic displacement parameters 1.2 times those of the attached atoms.
Compounds containing a pyrazole core and related analogs have received signicant attention due to their chemical, medicinal, and pharmaceutical applications. Several reports showed the pyrazolone moiety to be one of most active pharmacophores and possesses anti-cancer (Guckian et al., 2010), anti-viral (Fan et al., 2006), anti-tubercular (Castagnolo et al., 2008), anti-hyperlipedaemic (Idrees et al., 2009), anti-depressant, anti-convulsant (Abdel-Aziz et al., 2009), anti-oxidant, anti-bacterial (Manojkumar et al., 2009; Shete et al., 2011), anti-HIV (Sujatha et al., 2009), anti-inflammatory, analgesic and anti-pyretic (El-Hawash et al., 2006) activities. The pyrazolone-like edaravone has been developed as a drug for brain ischemia (Kawai et al., 1997) and has also been reported to be effective for myocardial ischemia (Wu et al., 2002). Additionally, pyrazolones have been reported to be the key starting materials for the synthesis of commercial aryl/heteroaropyrazolone dyes (Basaif et al., 2007; Ho, 2005). Halogenated pyrazolones are also useful synthetic intermediates for synthesis of diazo-dyes (Kirschke et al., 1984), fused (Chande et al., 1993) and spiro-heterocyclic compounds (El-Saraf & El-Sayed 2003). In this context we report the synthesis and
of the title compound.The phenyl ring C1–C6 is nearly perpendicular to the 5-membered ring (dihedral angle = 88.47 (5)°) while the latter makes a dihedral angle of 10.49 (8)° with the phenyl ring C11–C16. The rotational orientation of the latter phenyl ring as well as that of the N2—H2a unit are determined by the intramolecular C16—H16···O2 and N2—H2a···O2 hydrogen bonds (Table 1, Fig. 1) forming S(6) ring motifs (Bernstein et al., 1995). The packing involves sheets of molecules parallel to the (100) plane formed by N3—H3a···O1 and pairwise N1—H1a···O2 intermolecular hydrogen bonds (Table 1, Figs. 2 and 3).
For the diverse biological activities of pyrazolone compounds, see: Guckian et al. (2010); Fan et al. (2006); Castagnolo et al. (2008); Idrees et al. (2009); Abdel-Aziz et al. (2009); Manojkumar et al. (2009); Shete et al. (2011); Sujatha et al. (2009); El-Hawash et al. (2006); Kawai et al. (1997); Wu et al. (20026). For industrial applications of pyrazolones, see: Basaif et al. (2007); Ho (2005); Kirschke et al. (1984); Chande et al. (1993); El-Saraf & El-Sayed (2003). For graph-set motif notation, see: Bernstein et al. (1995).
Data collection: APEX2 (Bruker, 2013); cell
SAINT (Bruker, 2013); data reduction: SAINT (Bruker, 2013); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg & Putz, 2012); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).Fig. 1. The title molecule showing intramolecular hydrogen bonds as dotted lines. Displacement ellipsoids are drawn at the 50% probability level. | |
Fig. 2. Packing viewed down the a axis with intermolecular hydrogen bonds shown as dotted lines. | |
Fig. 3. Packing viewed down the c axis with intermolecular hydrogen bonds shown as dotted lines. |
C16H14N4O2 | F(000) = 616 |
Mr = 294.31 | Dx = 1.367 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 9891 reflections |
a = 8.4488 (12) Å | θ = 2.2–28.6° |
b = 11.5605 (17) Å | µ = 0.09 mm−1 |
c = 14.642 (2) Å | T = 150 K |
β = 91.565 (2)° | Plate, colourless |
V = 1429.6 (4) Å3 | 0.26 × 0.20 × 0.07 mm |
Z = 4 |
Bruker SMART APEX CCD diffractometer | 3674 independent reflections |
Radiation source: fine-focus sealed tube | 2895 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.049 |
Detector resolution: 8.3660 pixels mm-1 | θmax = 28.7°, θmin = 2.2° |
φ and ω scans | h = −11→11 |
Absorption correction: multi-scan (SADABS; Bruker, 2013) | k = −15→15 |
Tmin = 0.85, Tmax = 0.99 | l = −19→19 |
25571 measured reflections |
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: mixed |
wR(F2) = 0.112 | H-atom parameters constrained |
S = 1.03 | w = 1/[σ2(Fo2) + (0.0439P)2 + 0.5339P] where P = (Fo2 + 2Fc2)/3 |
3674 reflections | (Δ/σ)max < 0.001 |
199 parameters | Δρmax = 0.25 e Å−3 |
0 restraints | Δρmin = −0.21 e Å−3 |
C16H14N4O2 | V = 1429.6 (4) Å3 |
Mr = 294.31 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 8.4488 (12) Å | µ = 0.09 mm−1 |
b = 11.5605 (17) Å | T = 150 K |
c = 14.642 (2) Å | 0.26 × 0.20 × 0.07 mm |
β = 91.565 (2)° |
Bruker SMART APEX CCD diffractometer | 3674 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2013) | 2895 reflections with I > 2σ(I) |
Tmin = 0.85, Tmax = 0.99 | Rint = 0.049 |
25571 measured reflections |
R[F2 > 2σ(F2)] = 0.043 | 0 restraints |
wR(F2) = 0.112 | H-atom parameters constrained |
S = 1.03 | Δρmax = 0.25 e Å−3 |
3674 reflections | Δρmin = −0.21 e Å−3 |
199 parameters |
Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell e.s.d.'s are taken into account in the estimation of distances, angles and torsion angles |
Refinement. Refinement on F2 for ALL reflections except those flagged by the user for potential systematic errors. Weighted R-factors wR and all goodnesses of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The observed criterion of F2 > σ(F2) is used only for calculating -R-factor-obs 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 | ||
O1 | 0.63625 (12) | 0.59121 (8) | 0.76051 (6) | 0.0326 (3) | |
O2 | 0.48112 (11) | 0.70165 (8) | 0.48802 (6) | 0.0318 (3) | |
N1 | 0.72819 (12) | 0.44304 (9) | 0.62602 (7) | 0.0271 (3) | |
N2 | 0.64406 (12) | 0.54510 (9) | 0.60905 (7) | 0.0271 (3) | |
N3 | 0.38524 (14) | 0.88161 (10) | 0.66714 (7) | 0.0304 (3) | |
N4 | 0.38879 (13) | 0.85733 (9) | 0.57481 (7) | 0.0280 (3) | |
C1 | 0.89573 (15) | 0.45011 (12) | 0.62204 (8) | 0.0284 (3) | |
C2 | 0.98148 (18) | 0.34748 (14) | 0.62651 (10) | 0.0394 (4) | |
C3 | 1.14618 (19) | 0.35060 (17) | 0.62340 (11) | 0.0501 (5) | |
C4 | 1.22455 (18) | 0.45435 (18) | 0.61602 (10) | 0.0506 (6) | |
C5 | 1.13945 (18) | 0.55579 (17) | 0.61308 (10) | 0.0468 (5) | |
C6 | 0.97471 (16) | 0.55477 (13) | 0.61649 (9) | 0.0357 (4) | |
C7 | 0.60259 (15) | 0.61338 (10) | 0.67917 (8) | 0.0259 (3) | |
C8 | 0.51543 (15) | 0.71675 (11) | 0.65311 (8) | 0.0263 (3) | |
C9 | 0.46389 (16) | 0.79948 (11) | 0.71259 (8) | 0.0285 (4) | |
C10 | 0.46608 (15) | 0.75198 (11) | 0.56291 (8) | 0.0264 (3) | |
C11 | 0.31419 (16) | 0.93191 (11) | 0.50934 (8) | 0.0294 (3) | |
C12 | 0.3405 (2) | 0.91486 (13) | 0.41745 (9) | 0.0401 (5) | |
C13 | 0.2658 (2) | 0.98677 (15) | 0.35349 (10) | 0.0470 (5) | |
C14 | 0.1706 (2) | 1.07633 (15) | 0.37982 (11) | 0.0456 (5) | |
C15 | 0.1489 (2) | 1.09488 (16) | 0.47180 (11) | 0.0507 (6) | |
C16 | 0.21914 (19) | 1.02231 (14) | 0.53697 (10) | 0.0429 (5) | |
H1A | 0.68570 | 0.38480 | 0.59150 | 0.0320* | |
H2 | 0.92800 | 0.27560 | 0.63170 | 0.0470* | |
H2A | 0.62470 | 0.57050 | 0.55100 | 0.0320* | |
H3 | 1.20480 | 0.28050 | 0.62640 | 0.0600* | |
H3A | 0.36760 | 0.95490 | 0.68710 | 0.0360* | |
H4 | 1.33670 | 0.45590 | 0.61300 | 0.0610* | |
H5 | 1.19360 | 0.62750 | 0.60870 | 0.0560* | |
H6 | 0.91710 | 0.62530 | 0.61500 | 0.0430* | |
H9 | 0.48190 | 0.79820 | 0.77690 | 0.0340* | |
H12 | 0.40880 | 0.85480 | 0.39830 | 0.0480* | |
H13 | 0.28090 | 0.97360 | 0.29030 | 0.0560* | |
H14 | 0.12040 | 1.12490 | 0.33540 | 0.0550* | |
H15 | 0.08530 | 1.15780 | 0.49080 | 0.0610* | |
H16 | 0.20200 | 1.03470 | 0.60010 | 0.0520* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0487 (6) | 0.0260 (5) | 0.0230 (4) | −0.0009 (4) | 0.0018 (4) | −0.0005 (3) |
O2 | 0.0371 (5) | 0.0345 (5) | 0.0239 (4) | −0.0022 (4) | 0.0012 (4) | −0.0072 (4) |
N1 | 0.0270 (5) | 0.0257 (5) | 0.0286 (5) | −0.0012 (4) | 0.0029 (4) | −0.0043 (4) |
N2 | 0.0299 (5) | 0.0286 (5) | 0.0229 (5) | 0.0003 (4) | 0.0018 (4) | −0.0019 (4) |
N3 | 0.0432 (6) | 0.0268 (5) | 0.0212 (5) | 0.0004 (5) | 0.0013 (4) | −0.0033 (4) |
N4 | 0.0355 (6) | 0.0275 (5) | 0.0209 (5) | −0.0029 (4) | 0.0012 (4) | −0.0026 (4) |
C1 | 0.0268 (6) | 0.0398 (7) | 0.0186 (5) | −0.0005 (5) | 0.0015 (4) | −0.0041 (5) |
C2 | 0.0369 (7) | 0.0458 (8) | 0.0354 (7) | 0.0058 (6) | −0.0009 (6) | −0.0100 (6) |
C3 | 0.0378 (8) | 0.0735 (12) | 0.0386 (8) | 0.0187 (8) | −0.0043 (6) | −0.0178 (8) |
C4 | 0.0271 (7) | 0.0945 (14) | 0.0300 (7) | −0.0009 (8) | −0.0005 (6) | −0.0155 (8) |
C5 | 0.0343 (8) | 0.0735 (12) | 0.0326 (7) | −0.0175 (8) | −0.0005 (6) | −0.0012 (7) |
C6 | 0.0314 (7) | 0.0462 (8) | 0.0294 (6) | −0.0083 (6) | −0.0002 (5) | 0.0010 (6) |
C7 | 0.0286 (6) | 0.0248 (6) | 0.0243 (6) | −0.0078 (5) | 0.0027 (5) | −0.0024 (5) |
C8 | 0.0301 (6) | 0.0249 (6) | 0.0239 (6) | −0.0053 (5) | 0.0027 (5) | −0.0020 (4) |
C9 | 0.0371 (7) | 0.0258 (6) | 0.0227 (6) | −0.0027 (5) | 0.0013 (5) | −0.0007 (5) |
C10 | 0.0278 (6) | 0.0269 (6) | 0.0246 (6) | −0.0065 (5) | 0.0028 (5) | −0.0034 (5) |
C11 | 0.0323 (6) | 0.0303 (6) | 0.0254 (6) | −0.0079 (5) | −0.0029 (5) | 0.0012 (5) |
C12 | 0.0551 (9) | 0.0380 (8) | 0.0274 (7) | −0.0010 (7) | 0.0031 (6) | 0.0003 (6) |
C13 | 0.0633 (10) | 0.0502 (9) | 0.0272 (7) | −0.0051 (8) | −0.0014 (7) | 0.0052 (6) |
C14 | 0.0510 (9) | 0.0471 (9) | 0.0378 (8) | −0.0043 (7) | −0.0130 (7) | 0.0098 (7) |
C15 | 0.0572 (10) | 0.0515 (10) | 0.0427 (9) | 0.0147 (8) | −0.0115 (7) | −0.0006 (7) |
C16 | 0.0503 (9) | 0.0473 (9) | 0.0307 (7) | 0.0106 (7) | −0.0064 (6) | −0.0034 (6) |
O1—C7 | 1.2436 (15) | C8—C9 | 1.3724 (18) |
O2—C10 | 1.2509 (15) | C8—C10 | 1.4332 (17) |
N1—N2 | 1.3962 (15) | C11—C16 | 1.385 (2) |
N1—C1 | 1.4207 (16) | C11—C12 | 1.3838 (18) |
N2—C7 | 1.3489 (16) | C12—C13 | 1.391 (2) |
N3—N4 | 1.3819 (15) | C13—C14 | 1.373 (2) |
N3—C9 | 1.3273 (17) | C14—C15 | 1.381 (2) |
N4—C10 | 1.3951 (17) | C15—C16 | 1.391 (2) |
N4—C11 | 1.4236 (16) | C2—H2 | 0.9500 |
N1—H1A | 0.9100 | C3—H3 | 0.9500 |
N2—H2A | 0.9100 | C4—H4 | 0.9500 |
N3—H3A | 0.9100 | C5—H5 | 0.9500 |
C1—C6 | 1.385 (2) | C6—H6 | 0.9500 |
C1—C2 | 1.391 (2) | C9—H9 | 0.9500 |
C2—C3 | 1.394 (2) | C12—H12 | 0.9500 |
C3—C4 | 1.376 (3) | C13—H13 | 0.9500 |
C4—C5 | 1.376 (3) | C14—H14 | 0.9500 |
C5—C6 | 1.394 (2) | C15—H15 | 0.9500 |
C7—C8 | 1.4493 (17) | C16—H16 | 0.9500 |
N2—N1—C1 | 116.56 (10) | N4—C11—C12 | 119.25 (12) |
N1—N2—C7 | 120.04 (10) | N4—C11—C16 | 120.65 (11) |
N4—N3—C9 | 108.74 (10) | C12—C11—C16 | 120.09 (13) |
N3—N4—C10 | 108.80 (10) | C11—C12—C13 | 119.18 (14) |
N3—N4—C11 | 120.98 (10) | C12—C13—C14 | 121.35 (14) |
C10—N4—C11 | 130.15 (10) | C13—C14—C15 | 119.04 (15) |
N2—N1—H1A | 110.00 | C14—C15—C16 | 120.65 (16) |
C1—N1—H1A | 113.00 | C11—C16—C15 | 119.64 (14) |
C7—N2—H2A | 119.00 | C1—C2—H2 | 120.00 |
N1—N2—H2A | 121.00 | C3—C2—H2 | 120.00 |
N4—N3—H3A | 121.00 | C2—C3—H3 | 120.00 |
C9—N3—H3A | 126.00 | C4—C3—H3 | 120.00 |
C2—C1—C6 | 119.79 (12) | C3—C4—H4 | 120.00 |
N1—C1—C2 | 117.86 (12) | C5—C4—H4 | 120.00 |
N1—C1—C6 | 122.33 (12) | C4—C5—H5 | 120.00 |
C1—C2—C3 | 119.71 (15) | C6—C5—H5 | 120.00 |
C2—C3—C4 | 120.54 (17) | C1—C6—H6 | 120.00 |
C3—C4—C5 | 119.57 (15) | C5—C6—H6 | 120.00 |
C4—C5—C6 | 120.87 (16) | N3—C9—H9 | 125.00 |
C1—C6—C5 | 119.50 (14) | C8—C9—H9 | 125.00 |
N2—C7—C8 | 115.01 (10) | C11—C12—H12 | 120.00 |
O1—C7—N2 | 123.43 (11) | C13—C12—H12 | 120.00 |
O1—C7—C8 | 121.56 (11) | C12—C13—H13 | 119.00 |
C7—C8—C10 | 127.58 (11) | C14—C13—H13 | 119.00 |
C9—C8—C10 | 107.30 (11) | C13—C14—H14 | 120.00 |
C7—C8—C9 | 125.12 (11) | C15—C14—H14 | 120.00 |
N3—C9—C8 | 110.09 (11) | C14—C15—H15 | 120.00 |
N4—C10—C8 | 104.97 (10) | C16—C15—H15 | 120.00 |
O2—C10—C8 | 129.92 (12) | C11—C16—H16 | 120.00 |
O2—C10—N4 | 125.08 (11) | C15—C16—H16 | 120.00 |
C1—N1—N2—C7 | −93.97 (13) | C2—C3—C4—C5 | 1.0 (2) |
N2—N1—C1—C2 | −171.62 (11) | C3—C4—C5—C6 | −0.7 (2) |
N2—N1—C1—C6 | 10.19 (17) | C4—C5—C6—C1 | −0.6 (2) |
N1—N2—C7—O1 | 0.51 (18) | O1—C7—C8—C9 | 0.9 (2) |
N1—N2—C7—C8 | −179.89 (10) | O1—C7—C8—C10 | −178.68 (13) |
C9—N3—N4—C10 | 3.27 (14) | N2—C7—C8—C9 | −178.74 (12) |
C9—N3—N4—C11 | −179.56 (11) | N2—C7—C8—C10 | 1.71 (19) |
N4—N3—C9—C8 | −2.57 (15) | C7—C8—C9—N3 | −178.73 (12) |
N3—N4—C10—O2 | 175.50 (12) | C10—C8—C9—N3 | 0.90 (15) |
N3—N4—C10—C8 | −2.61 (13) | C7—C8—C10—O2 | 2.7 (2) |
C11—N4—C10—O2 | −1.3 (2) | C7—C8—C10—N4 | −179.30 (12) |
C11—N4—C10—C8 | −179.44 (12) | C9—C8—C10—O2 | −176.90 (13) |
N3—N4—C11—C12 | 170.15 (13) | C9—C8—C10—N4 | 1.08 (14) |
N3—N4—C11—C16 | −8.37 (19) | N4—C11—C12—C13 | 179.11 (14) |
C10—N4—C11—C12 | −13.3 (2) | C16—C11—C12—C13 | −2.4 (2) |
C10—N4—C11—C16 | 168.14 (13) | N4—C11—C16—C15 | 179.27 (14) |
N1—C1—C2—C3 | −179.61 (13) | C12—C11—C16—C15 | 0.8 (2) |
C6—C1—C2—C3 | −1.4 (2) | C11—C12—C13—C14 | 2.0 (2) |
N1—C1—C6—C5 | 179.80 (12) | C12—C13—C14—C15 | −0.1 (3) |
C2—C1—C6—C5 | 1.64 (19) | C13—C14—C15—C16 | −1.6 (3) |
C1—C2—C3—C4 | 0.1 (2) | C14—C15—C16—C11 | 1.2 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1A···O2i | 0.91 | 2.06 | 2.9244 (14) | 158 |
N2—H2A···O2 | 0.91 | 2.14 | 2.8597 (14) | 136 |
N3—H3A···O1ii | 0.91 | 1.75 | 2.6527 (15) | 169 |
C12—H12···O2 | 0.95 | 2.28 | 2.9133 (18) | 124 |
C16—H16···O1ii | 0.95 | 2.51 | 3.2745 (18) | 137 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x+1, y+1/2, −z+3/2. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1A···O2i | 0.91 | 2.06 | 2.9244 (14) | 158 |
N2—H2A···O2 | 0.91 | 2.14 | 2.8597 (14) | 136 |
N3—H3A···O1ii | 0.91 | 1.75 | 2.6527 (15) | 169 |
C12—H12···O2 | 0.95 | 2.28 | 2.9133 (18) | 124 |
C16—H16···O1ii | 0.95 | 2.51 | 3.2745 (18) | 137 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x+1, y+1/2, −z+3/2. |
Acknowledgements
JTM thanks Tulane University for support of the Tulane Crystallography Laboratory.
References
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Compounds containing a pyrazole core and related analogs have received signicant attention due to their chemical, medicinal, and pharmaceutical applications. Several reports showed the pyrazolone moiety to be one of most active pharmacophores and possesses anti-cancer (Guckian et al., 2010), anti-viral (Fan et al., 2006), anti-tubercular (Castagnolo et al., 2008), anti-hyperlipedaemic (Idrees et al., 2009), anti-depressant, anti-convulsant (Abdel-Aziz et al., 2009), anti-oxidant, anti-bacterial (Manojkumar et al., 2009; Shete et al., 2011), anti-HIV (Sujatha et al., 2009), anti-inflammatory, analgesic and anti-pyretic (El-Hawash et al., 2006) activities. The pyrazolone-like edaravone has been developed as a drug for brain ischemia (Kawai et al., 1997) and has also been reported to be effective for myocardial ischemia (Wu et al., 2002). Additionally, pyrazolones have been reported to be the key starting materials for the synthesis of commercial aryl/heteroaropyrazolone dyes (Basaif et al., 2007; Ho, 2005). Halogenated pyrazolones are also useful synthetic intermediates for synthesis of diazo-dyes (Kirschke et al., 1984), fused (Chande et al., 1993) and spiro-heterocyclic compounds (El-Saraf & El-Sayed 2003). In this context we report the synthesis and crystal structure of the title compound.
The phenyl ring C1–C6 is nearly perpendicular to the 5-membered ring (dihedral angle = 88.47 (5)°) while the latter makes a dihedral angle of 10.49 (8)° with the phenyl ring C11–C16. The rotational orientation of the latter phenyl ring as well as that of the N2—H2a unit are determined by the intramolecular C16—H16···O2 and N2—H2a···O2 hydrogen bonds (Table 1, Fig. 1) forming S(6) ring motifs (Bernstein et al., 1995). The packing involves sheets of molecules parallel to the (100) plane formed by N3—H3a···O1 and pairwise N1—H1a···O2 intermolecular hydrogen bonds (Table 1, Figs. 2 and 3).