(E,E)-3-Methyl-2,5-bis­(4-methyl­benzyl­idene)cyclo­penta­none: synthesis, characterization, Hirshfeld surface analysis and anti­bacterial activity

Mahdi, F.; Sid, A.; Bouchene, R.; Mosset, P.; Roisnel, T.

doi:10.1107/S2056989019003827

research communications

CRYSTALLOGRAPHIC
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ISSN: 2056-9890

Volume 75| Part 4| April 2019| Pages 506-511

https://doi.org/10.1107/S2056989019003827

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(E,E)-3-Methyl-2,5-bis(4-methylbenzylidene)cyclopentanone: synthesis, characterization, Hirshfeld surface analysis and antibacterial activity

Fatiha Mahdi,^a Assia Sid,^a Rafika Bouchene,^b ^* Paul Mosset ^c and Thierry Roisnel ^c

^aLaboratoire des Sciences Analytiques, Matériaux et Environnement (LSAME), Université Larbi Ben M'hidi, Oum El Bouaghi, 04000, Algeria, ^bDépartement Sciences de la Matière, Faculté des Sciences Exactes et Sciences de la Nature et de la Vie, Université Larbi Ben M'hidi, Oum El Bouaghi, 04000, Algeria, and ^cUniversité de Rennes 1, Institut des Sciences Chimiques de Rennes, CNRS UMR, 6226, Avenue du Général Leclerc, 35042 Rennes Cedex, France
^*Correspondence e-mail: wbouchene@yahoo.fr

Edited by L. Fabian, University of East Anglia, England (Received 10 December 2018; accepted 19 March 2019; online 26 March 2019)

The title compound, (E,E)-3-methyl-2,5-bis(4-methylbenzylidene)cyclopentanone (MBMCP), C₂₂H₂₂O, was obtained by Claisen–Schmidt condensation of 4-methylbenzaldehyde with 3-methylcyclopentanone in good yield. The structure of MBMCP was studied using UV, FT–IR and Raman spectroscopy, single-crystal X-ray diffraction (XRD) measurements, and ¹H and ¹³C nuclear magnetic resonance (NMR) spectroscopy. The molecular structure of MBMCP is fully extended in the E,E configuration. C—H⋯π stacking interactions play a significant role in the stabilization of the molecular packing. Hirshfeld surface analysis was used to quantify the non-covalent interactions in the crystal lattice. Microbiological studies were performed to investigate the antimicrobial activity of this new product.

Keywords: Claisen–Schmidt reaction; crossed-aldol condensation; crystal structure; spectroscopic studies.

CCDC reference: 1515960

1. Chemical context

The Claisen–Schmidt reaction has great importance in the synthesis of organic compounds (Rajput & Kaur, 2012 ), in particular in the synthesis of bis(substituted-benzylidene)cycloalkanones. This reaction is catalysed using strong acids (Dhar & Barton, 1981 ; Gall et al., 1999 ) and base with or without solvents (Geissman & Clinton, 1946 ; Shan et al., 2010 ). Recently, animal bone meal was used as a catalyst for crossed-aldol condensation (Riadi et al., 2010 ). The preparation of β-chloro, β-bromo and α,β-unsaturated ketones from β-diketones has been carried out using Vilsmeier reagents (Mewshaw et al., 1989 ). Numerous α,α′-bis(substituted-benzylidene)cycloalkanones exhibit biological activities (Robinson et al., 2005 ; Piantadosi et al., 1973 ). Furthermore, they are used as precursors for the preparation of biologically active heterocyclic compounds, such as pyrimidines (Deli et al., 1984 ; Guilford et al., 1999 ) and pyrazolines (Ziani et al., 2013 ). These compounds have received a lot of attention because of their uses as perfume intermediates, pharmaceutical, agrochemical and liquid-crystal polymer units (Artico et al., 1998 ; Amoozadeh et al., 2010 ). α,α′-Bis(substituted-benzylidene)cycloalkanones are also essential pharmacophores of various natural products (Shetty et al., 2015 ). An example of permitted therapeutic agents including this molecular framework is coumarin-chalcone (anticancer agents).

In the present work, we have synthesized, in one-step, (E,E)-3-methyl-2,5-bis(4-methylbenzylidene)cyclopentanone (MBMCP) by NaOH-catalysed Claisen–Schmidt condensation of 4-methyl benzaldehyde with 3-methyl cyclopentanone (see scheme). The structure of MBMCP was investigated by UV, FT–IR and Raman spectroscopy, single crystal X-ray diffraction (XRD) measurements and ¹H and ¹³C nuclear magnetic resonance (NMR) spectroscopy.

Several studies on the biological activity of unsaturated carbonyl compounds have been carried out. As an example, a series of chalcone derivatives that mimic the essential properties of cationic antimicrobial peptides were designed and synthesized by Chu et al. (2018 ). The antibacterial activities of these chalcones against drug-sensitive bacteria, including Staphylococcus aureus, Enterococcus faecalis, Escherichia coli and Salmonella enterica indicate that these compounds have potential therapeutic effects against bacterial infections. The phenyl group and the fluoride atom in these compounds were found to play an important role in their antibacterial and hemolytic activities. The above findings prompted us to evaluate the antibacterial activity of MBMCP in vitro against four bacterial strains.

2. Structural commentary

The structure of MBMCP was confirmed using single X-ray diffraction. The asymmetric unit comprised a single molecule, illustrated in Fig. 1 with the atom-numbering scheme. The cyclopentanone ring adopts a half-chair form, with deviations of −0.146 (2) and 0.160 (2) Å from the mean plane of the ring for C13 and C14, respectively. The torsion angles within the five-membered ring are 4.7 (2) (C9—C10—C12—C13), −19.5 (2)° (C10—C12—C13—C14) and 26.3 (2)° (C12—C13—C14—C9), confirming the non-planarity of the central ring. The C15 methyl group in MBMCP lies practically perpendicular to the plane of its attached cyclopentanone ring, with torsion angle C12—C13—C14—C15 of −91.4 (2)°. The mean planes of the phenyl rings at either end of the molecule are twisted with respect to one another by 41.3 (1)°.

Figure 1
The asymmetric unit of MBMCP, showing the atom-numbering scheme. Displacement ellipsoids are drawn at the 50% probability level.

The C8=C9 and C12=C16 bond lengths are 1.344 (3) and 1.335 (3) Å, respectively, and those for C8—C5 and C16—C17 are 1.464 (3) and 1.462 (3) Å, respectively. These values are in between the normal values for single and double bonds (1.54 and 1.33 Å, respectively), which is consistent with a delocalized π-bonding system.

The molecular structure of MBMCP is fully extended in the E,E configuration stabilized by two short intramolecular contacts, H8⋯O11 and H16⋯O11 (2.55 and 2.53 Å, respectively).

3. Spectroscopic results

The FT–IR spectrum of MBMCP shows the strong band of a conjugated carbonyl group at 1670 cm⁻¹ and two bands at 1616 and at 1596 cm⁻¹ for the two non-equivalent exo-cyclic C=C bonds. The Raman spectrum shows two characteristic bands in the 1720–1670 and 1620–1590 cm⁻¹ regions, which indicate the presence of carbonyl groups conjugated with the double bonds.

The above result is also confirmed using the chemical shifts in the ¹³C NMR spectrum for the carbonyl groups (196.46 ppm) and of the C=C group at (139.7 and 139.8 ppm). The dienone of cyclic ketone derivatives occur in E,E, Z,Z, or Z,E configurations (Vatsadze et al., 2006 ) and we have obtained the E,E isomer. The ¹H NMR spectrum shows the signals of CH protons at a greater field than 7.2 ppm (δ = 7.51–7.53 ppm), which is in agreement with the E isomers, whereas the signals for the Z isomers are identified using the chemical shifts at δ ∼6.8 ppm (George & Roth, 1971 ).

The UV spectrum of the designated compound in ethanol reveals four absorption bands at 208 nm (∊ = 3.215 L mol⁻¹cm⁻¹), 237 nm (∊ = 1.984 L mol⁻¹cm⁻¹), 364 nm (∊ = 3.215 L mol⁻¹cm⁻¹) and 376 nm (∊ = 2.436 L mol⁻¹cm⁻¹) assigned to n–π, π–π* transitions.

4. Supramolecular features

Molecules of MBMCP pack with no classical hydrogen bonds. However, C18—H18⋯O11(1 − x, −y,1 − z) and C23—H23B⋯O11( $[{1\over 2}]$ + x, $[{1\over 2}]$ − y, $[{1\over 2}]$ + z) short contacts occur, where the oxygen atom of the carbonyl group works as an acceptor with O11⋯H distances of 2.61 and 2.66 Å, respectively. These interactions are neglected as the H⋯O van der Waals distance is 2.60 Å and C—H⋯O contacts frequently have H⋯O separations shorter than 2.4 Å (Taylor & Kennard, 1982 ). On the other hand, even though the carbonyl group is a strong acceptor, the O atom acts as a multiple acceptor. This condition corresponds to an important argument for the structural importance of the C—H⋯O hydrogen bond (Steiner, 1996 ).

Molecular chains of MBMCP propagate along the [101] direction through a C—H⋯π interaction (Table 1) involving the C4–H4 group of the C2–C7 phenyl ring pointing towards the π cloud on an adjacent C17–C22 ring, as shown in Fig. 2. The contact distances are consistent with those of the C—H⋯π edge-to-face interactions observed in the crystal structure of benzene (Bacon et al., 1964 ).

Table 1
Hydrogen-bond geometry (Å, °)

Cg1 and Cg2 are the centroids of the C2–C7 and C17–C22 rings, respectively.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C1—H1C⋯Cg1ⁱ	0.98	2.84	3.728 (3)	152
C4—H4⋯Cg2ⁱⁱ	0.95	2.75	3.574 (2)	146
Symmetry codes: (i) -x+1, -y+1, -z; (ii) $[x-{\script{1\over 2}}, -y+{\script{1\over 2}}, z-{\script{1\over 2}}]$ .

Figure 2
The one-dimensional chain structure of MBMCP formed via C—H⋯π interactions (blue dashed lines). The green spheres indicate the centroids of the phenyl ring.

The molecules of MBMCP stack in waves along the a-axis direction, as shown in Fig. 3. The methyl carbon (C1) makes an important contribution to the stability of this stacking arrangement via the establishment of a C—H⋯π interaction with the centroid of a neighboring aryl ring.

Figure 3
Crystal packing of MBMCP. The green spheres indicate the centroids of the phenyl ring.

5. Hirshfeld surface analysis

The intermolecular interactions were quantified using Hirshfeld surface analysis (Fig. 4). The Hirshfeld surfaces of MBMCP, their associated two-dimensional fingerprint plots and relative contributions to the Hirshfeld surface area from the various close intermolecular contacts were calculated using CrystalExplorer software (Wolff et al., 2007 ). The analysis of intermolecular interactions through the mapping of d_norm compares the contact distances d_i and d_e from the Hirshfeld surface to the nearest atom inside and outside, respectively, with their respective van der Waals radii. The red regions represent contacts shorter than the sum of van der Waals radii, white regions represent intermolecular distances equal to van der Waals contacts and blue regions represent contacts longer than van der Waals radii.

Figure 4
(a) View of the three-dimensional Hirshfeld surface mapped over d_norm, (b) the two-dimensional fingerprint plot and (c) the relative contributions to the Hirshfeld surface area by the various close intermolecular contacts in the structure of MBMCP.

As expected in organic compounds, the shortest and most abundant contacts for MBMCP are the H⋯H intermolecular interactions with a contribution to the Hirshfeld surface of 58%. The C⋯H contacts, which refer to the C—H⋯π interactions described previously, contribute 32.2% of the Hirshfeld surfaces. On the shape-index surface, the C—H⋯π interactions are clearly observed as red regions over the aromatic rings. The shape-index is in agreement with the 2D fingerprint plot, in which these interactions appear as two broad spikes both having d_e + d_i ∼2.7 Å (Fig. 5). The large flat region, delineated by a blue outline on the curvedness of MBMCP reveals that π–π stacking interactions are absent.

Figure 5
(a) The Hirshfeld surface mapped over shape-index, (b) the two-dimensional fingerprint plot for the H⋯C/C⋯H interactions, (c) the Hirshfeld surface mapped over curvedness and (d) the two-dimensional fingerprint plot for the C⋯C interactions in the title compound.

6. Antibacterial activity

The antibacterial activity of MBMCP was assayed in vitro against Escherchia coli, Staphyococcus aureus, Salmonella typhi and Bacillus subtilis via an agar cup-plate diffusion method (Barry, 1976 ; Ponce et al., 2003 ). The bacteria tests were sub-cultured in Mueller–Hinton broth, from which 1 mL of cell suspension was taken and the optical density was adjusted to 0.5. The suspension was then spread as a thin film over the Mueller–Hinton agar plates. The synthetic compound was loaded onto discs with concentrations of 0.2, 0.3, 0.4 and 0.5 µg mL⁻¹ and air-dried. The dry discs were placed on the inoculated Mueller–Hinton agar plates and incubated at 310 K for 48 h. A penicillin disc (10 µg per disc) was used as the standard. A disc of 150 µl of DMSO served as the control. After incubation, the zone of inhibition (in mm) was measured and compared with that of penicillin for each concentration.

The antibacterial screening results are collected in Table 2. They reveal that the produced compound shows an antibacterial activity at MIC = 0.5 µg mL⁻¹ towards all the bacterial strains, but differs from one strain to another when comparing the zones of inhibition (mm). It exhibits moderate and promising activities against Staphylococcus aureus (27 mm) and Bacillus subtilis (14 mm). However, it shows low activities against Escherchia coli (7 mm) and Salmonella typhi (12 mm), which probably demonstrate that the produced compound exhibits a specific effect on those microorganisms.

Table 2
Antibacterial screening results (zone of inibition, mm)

Compound	Escherchia coli	Salmonella typhi	Staphylococcus aureus	Bacillus subtilis
MBMCP	07	12	27	14
Penecillin	18	25	40	17
DMSO	–	–	–	–
(-) No antibacterial activity

7. Database survey

A search of the Cambridge Structural Database, CSD (Version 5.38; ConQuest 1.19; Groom et al., 2016 ) revealed 20 derivatives of bis(benzylidene)cyclopentanone. The variety of compounds reported in the literature (Kawamata et al., 1998 ; Nakhaei et al., 2017 ) is due to substitution on the phenyl rings and/or on the cyclopentanone by different functional groups, such as hydroxy, methoxy, chlorine, fluorine etc., and also by radicals. Cyclic conjugated bis(benzylidene)ketones have been reported to exhibit potent anti-inflammatory, antibacterial and antioxidant activity (Shetty et al., 2015). E,E-2,5-dibenzylidene-3-methylcyclopentanone (DBMCP) is the nearest analogue to MBMCP. This molecule, like that of the title compound, exhibits a twisted five-membered ring, conveying modest non-planarity to the overall molecular shape with a maximum deviation from the mean plane of 0.44 Å (Theocharis et al., 1984 ). The basic skeleton of this compound family, E,E-2,5-dibenzylidenecyclopentanone (DBCP), has been isolated in two polymorphic forms, exhibiting two different but nearly superimposable conformations (Arshad et al., 2014 ). The previously reported polymorph I crystallizes in the orthorhombic C222₁ space group (Theocharis et al., 1984), while the second form crystallizes in the monoclinic P2₁ space group. Both forms pack as supramolecular chains mainly stabilized by C—H⋯O, π–π and C—H⋯π interactions and forming sheet-like multilayered structures.

8. Synthesis and crystallization

A mixture of 4-methylbenzaldehyde (20 mmol, 2 eq.) and 3-methylcyclopentanone (10 mmol, 1 eq.) were dissolved in ethanol (15 mL) into a flask (simple necked, round bottomed), and the solution was stirred for a few minutes at 273 K (ice bath). A solution of NaOH (10 mL, 40%) was added dropwise over several minutes into this mixture. The resulting mixture was stirred for 4 h approximately at room temperature. The obtained yellow precipitate was then filtered, washed with HCl (0.1 N) and cold water and then dried. The pure product was crystallized from ethanol solution at room temperature in 75% yield. Single crystals for X-ray diffraction were grown by slow solvent evaporation from a solution in ethanol.

The FT–IR spectrum of the compound was measured by the KBr pellet technique in the range of 4000–400 cm⁻¹, with a Nexus Nicolet FT–IR spectrometer at a resolution of 2 cm⁻¹. A Bruker Optik GmbH system was utilized to measure the Raman spectrum of the powder compound. A class 4 laser Raman spectrometer of 532 nm excitation from a diode laser (3B) was used with 2 cm⁻¹ resolution within the spectroscopic range 3500–0 cm^{−1. 1}H and ¹³C NMR spectra were quantified with CDCl₃ using a (400.13 MHz in 1H) Avance 400 Bruker spectrometer with TMS as internal standard.

¹H NMR (400 MHz, CDCl₃) δ (ppm): 1.23 (d, 1H, CH₃), 1.54 (s, 2H, H₂O), 2.39 (s, 6H, 2CH₃), 2.76 (dd, 1H_cycle), 3.18 (ddd, 1H_cycle), 3.66 (m, 1H_cycle), 7.22 (d, 2H_aryl), 7.25 (d, 2H_aryl), 7.47 (d, 3H_aryl), 7.51 (s, 1H_ethylenic), 7.53 (s, 1H_ethylenic), and 7.66 (t, 1H_aryl).

¹³C NMR (75.46 MHz, CDCl₃) δ (ppm): 21.03 (CH₃), 23.47 (CH₃), 23.49 (CH₃), 32.01 (CH_cycle), 35.98 (CH_2cycle), 129.51 (2C—Ar), 129.62 (2C—Ar), 130.71 (2C—Ar), 130.79 (2C—Ar), 133.37 (2C—Ar), 134.38 (2C—Ar), 135.57 (CH=C_cycle), 139.72 (C_cycle=CH), 139.76 (C_cycle=CH), 142.51 (CH=C_cycle), and 196.46 (C=O).

Fourier–transform infrared (FT–IR) spectroscopy (KBr, cm⁻¹): 3056–3022 (CH _aromatic), 2863 (CH _alyphatic), 1670 (C=O), 1616 and 1596 (C=C), and 1590.90, 1545.45 (C=C of aromatic rings).

Raman spectroscopy with 1000–1670 Hz frequency range for the C—C, C=C and C=O bonds. In addition, 2800–3156 Hz frequency domain for C—H bonds. Ultraviolet (UV) spectroscopy [EtOH, λ (nm)]: 208, 237 assignable to π–π, and 364, 376 assignable to π–π* transitions.

9. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 3. H atoms were included in their calculated positions and refined using the riding-atom approximation: C—H = 0.96 Å (methyl CH₃) and 0.93 Å (aryl), with U_iso(H) = 1.5U_eq(C) for methyl H atoms and 1.2U_eq(C) for all other H atoms.

Table 3
Experimental details

Crystal data
Chemical formula	C₂₂H₂₂O
M_r	302.39
Crystal system, space group	Monoclinic, P2₁/n
Temperature (K)	150
a, b, c (Å)	9.8037 (9), 8.9815 (9), 18.8946 (17)
β (°)	90.985 (4)
V (Å³)	1663.5 (3)
Z	4
Radiation type	Mo Kα
μ (mm⁻¹)	0.07
Crystal size (mm)	0.52 × 0.28 × 0.06

Data collection
Diffractometer	Bruker D8 VENTURE
Absorption correction	Multi-scan (SADABS; Bruker, 2014 )
T_min, T_max	0.735, 0.996
No. of measured, independent and observed [I > 2σ(I)] reflections	15325, 3808, 2471
R_int	0.115

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.070, 0.171, 1.12
No. of reflections	3808
No. of parameters	211
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.30, −0.26
Computer programs: APEX3 (Bruker, 2015 ), SAINT (Bruker, 2014), SHELXT (Sheldrick, 2015a ), SHELXL2014 (Sheldrick, 2015b ), ORTEP-3 for Windows (Farrugia, 2012 ), DIAMOND (Brandenburg & Berndt, 2001 ) and CRYSCALc (T. Roisnel, local program, version of 2015).

Supporting information

CCDC reference: 1515960

Crystal structure: contains datablock I. DOI: https://doi.org/10.1107/S2056989019003827/fy2134sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989019003827/fy2134Isup2.hkl

Supporting information file. DOI: https://doi.org/10.1107/S2056989019003827/fy2134Isup3.cml

checkCIF report

Computing details top

Data collection: SAINT (Bruker, 2014); cell refinement: APEX3 (Bruker, 2015) and SAINT (Bruker, 2014); data reduction: SAINT (Bruker, 2014); program(s) used to solve structure: SHELXT (Sheldrick, 2015a); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015b); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and DIAMOND (Brandenburg & Berndt, 2001); software used to prepare material for publication: CRYSCALc (T. Roisnel, local program, version of 2015).

(E,E)-3-Methyl-2,5-bis(4-methylbenzylidene)cyclopentanone top

Crystal data top

C₂₂H₂₂O	F(000) = 648
M_r = 302.39	D_x = 1.207 Mg m⁻³
Monoclinic, P2₁/n	Mo Kα radiation, λ = 0.71073 Å
a = 9.8037 (9) Å	Cell parameters from 2848 reflections
b = 8.9815 (9) Å	θ = 2.4–27.4°
c = 18.8946 (17) Å	µ = 0.07 mm⁻¹
β = 90.985 (4)°	T = 150 K
V = 1663.5 (3) Å³	Thick plate, colourless
Z = 4	0.52 × 0.28 × 0.06 mm

Data collection top

Bruker D8 VENTURE diffractometer	3808 independent reflections
Radiation source: Incoatec microfocus sealed tube	2471 reflections with I > 2σ(I)
Multilayer monochromator	R_int = 0.115
rotation images scans	θ_max = 27.5°, θ_min = 3.1°
Absorption correction: multi-scan (SADABS; Bruker, 2014)	h = −12→12
T_min = 0.735, T_max = 0.996	k = −11→10
15325 measured reflections	l = −24→24

Refinement top

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)] = 0.070	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.171	H-atom parameters constrained
S = 1.12	w = 1/[σ²(F_o²) + (0.0652P)² + 0.431P] where P = (F_o² + 2F_c²)/3
3808 reflections	(Δ/σ)_max = 0.005
211 parameters	Δρ_max = 0.30 e Å⁻³
0 restraints	Δρ_min = −0.26 e Å⁻³

Special details top

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) top

	x	y	z	U_iso*/U_eq
C1	0.6385 (3)	0.4045 (3)	−0.09361 (12)	0.0385 (6)
H1A	0.6054	0.3291	−0.1273	0.058*
H1B	0.7347	0.4259	−0.1025	0.058*
H1C	0.5848	0.4958	−0.0994	0.058*
C2	0.6242 (2)	0.3472 (3)	−0.01957 (12)	0.0274 (5)
C3	0.5158 (2)	0.2568 (3)	−0.00074 (13)	0.0357 (6)
H3	0.4503	0.2287	−0.0359	0.043*
C4	0.5009 (2)	0.2070 (3)	0.06766 (12)	0.0316 (6)
H4	0.4260	0.1443	0.0785	0.038*
C5	0.5940 (2)	0.2468 (2)	0.12164 (11)	0.0227 (5)
C6	0.7056 (2)	0.3345 (3)	0.10266 (12)	0.0286 (5)
H6	0.7722	0.3611	0.1375	0.034*
C7	0.7195 (2)	0.3824 (3)	0.03386 (12)	0.0308 (6)
H7	0.7964	0.4414	0.0223	0.037*
C8	0.5659 (2)	0.1961 (3)	0.19360 (12)	0.0242 (5)
H8	0.4994	0.1195	0.1962	0.029*
C9	0.6180 (2)	0.2391 (2)	0.25660 (12)	0.0226 (5)
C10	0.5636 (2)	0.1772 (2)	0.32316 (12)	0.0232 (5)
O11	0.49025 (16)	0.06702 (19)	0.32852 (8)	0.0328 (4)
C12	0.6133 (2)	0.2716 (2)	0.38293 (12)	0.0228 (5)
C13	0.6898 (2)	0.4010 (2)	0.35203 (11)	0.0244 (5)
H13A	0.7731	0.4227	0.3805	0.029*
H13B	0.6318	0.4913	0.3506	0.029*
C14	0.7269 (2)	0.3520 (2)	0.27653 (12)	0.0235 (5)
H14	0.7247	0.4386	0.2433	0.028*
C15	0.8679 (2)	0.2773 (3)	0.27741 (13)	0.0315 (6)
H15A	0.8700	0.1980	0.3130	0.047*
H15B	0.9381	0.3515	0.2891	0.047*
H15C	0.8856	0.2349	0.2307	0.047*
C16	0.5869 (2)	0.2357 (2)	0.44987 (11)	0.0236 (5)
H16	0.5378	0.1453	0.4553	0.028*
C17	0.6207 (2)	0.3119 (2)	0.51624 (11)	0.0230 (5)
C18	0.6069 (2)	0.2345 (3)	0.57982 (12)	0.0262 (5)
H18	0.5783	0.1335	0.5787	0.031*
C19	0.6338 (2)	0.3014 (3)	0.64411 (12)	0.0288 (6)
H19	0.6255	0.2451	0.6864	0.035*
C20	0.6730 (2)	0.4508 (3)	0.64823 (12)	0.0269 (5)
C21	0.6866 (2)	0.5284 (3)	0.58517 (12)	0.0274 (5)
H21	0.7138	0.6299	0.5866	0.033*
C22	0.6614 (2)	0.4612 (3)	0.52014 (12)	0.0247 (5)
H22	0.6718	0.5170	0.4779	0.030*
C23	0.6981 (3)	0.5255 (3)	0.71853 (13)	0.0394 (7)
H23A	0.7168	0.6314	0.7110	0.059*
H23B	0.7766	0.4790	0.7425	0.059*
H23C	0.6172	0.5147	0.7478	0.059*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
C1	0.0416 (15)	0.0411 (16)	0.0330 (14)	−0.0006 (12)	0.0010 (11)	0.0032 (12)
C2	0.0267 (12)	0.0281 (13)	0.0273 (12)	0.0035 (10)	0.0014 (10)	−0.0004 (10)
C3	0.0260 (12)	0.0494 (17)	0.0314 (14)	−0.0082 (11)	−0.0056 (10)	−0.0007 (12)
C4	0.0218 (12)	0.0392 (15)	0.0338 (14)	−0.0112 (10)	0.0002 (10)	−0.0009 (11)
C5	0.0189 (10)	0.0199 (11)	0.0293 (12)	0.0013 (9)	0.0013 (9)	0.0003 (9)
C6	0.0218 (11)	0.0329 (14)	0.0309 (13)	−0.0075 (10)	−0.0032 (9)	−0.0017 (11)
C7	0.0279 (12)	0.0310 (14)	0.0337 (13)	−0.0112 (10)	0.0049 (10)	0.0000 (11)
C8	0.0168 (10)	0.0214 (12)	0.0346 (13)	0.0001 (9)	0.0000 (9)	0.0012 (10)
C9	0.0180 (10)	0.0180 (11)	0.0318 (12)	0.0041 (8)	0.0001 (9)	0.0022 (10)
C10	0.0198 (11)	0.0198 (11)	0.0299 (12)	0.0018 (9)	−0.0011 (9)	0.0049 (10)
O11	0.0343 (9)	0.0284 (9)	0.0357 (10)	−0.0127 (8)	−0.0001 (7)	0.0056 (8)
C12	0.0191 (10)	0.0178 (11)	0.0314 (12)	0.0040 (8)	−0.0008 (9)	0.0037 (10)
C13	0.0240 (11)	0.0192 (12)	0.0298 (12)	−0.0016 (9)	−0.0013 (9)	0.0019 (10)
C14	0.0202 (11)	0.0203 (12)	0.0299 (12)	−0.0027 (9)	0.0016 (9)	0.0031 (10)
C15	0.0212 (11)	0.0354 (15)	0.0380 (14)	−0.0036 (10)	−0.0009 (10)	−0.0031 (11)
C16	0.0205 (11)	0.0180 (11)	0.0323 (13)	0.0033 (9)	0.0017 (9)	0.0041 (10)
C17	0.0168 (10)	0.0234 (12)	0.0289 (12)	0.0040 (9)	0.0029 (9)	0.0053 (10)
C18	0.0208 (11)	0.0248 (13)	0.0331 (13)	0.0035 (9)	0.0032 (9)	0.0065 (10)
C19	0.0222 (11)	0.0374 (14)	0.0271 (13)	0.0108 (10)	0.0050 (9)	0.0104 (11)
C20	0.0164 (10)	0.0387 (14)	0.0258 (12)	0.0111 (10)	0.0011 (9)	−0.0002 (11)
C21	0.0223 (11)	0.0247 (13)	0.0352 (14)	0.0049 (9)	0.0017 (10)	0.0018 (10)
C22	0.0227 (11)	0.0263 (13)	0.0252 (12)	0.0043 (9)	0.0005 (9)	0.0061 (10)
C23	0.0380 (14)	0.0501 (17)	0.0302 (14)	0.0100 (12)	0.0005 (11)	−0.0021 (12)

Geometric parameters (Å, º) top

C1—C2	1.499 (3)	C13—H13A	0.9900
C1—H1A	0.9800	C13—H13B	0.9900
C1—H1B	0.9800	C14—C15	1.536 (3)
C1—H1C	0.9800	C14—H14	1.0000
C2—C3	1.388 (3)	C15—H15A	0.9800
C2—C7	1.400 (3)	C15—H15B	0.9800
C3—C4	1.378 (3)	C15—H15C	0.9800
C3—H3	0.9500	C16—C17	1.462 (3)
C4—C5	1.404 (3)	C16—H16	0.9500
C4—H4	0.9500	C17—C18	1.396 (3)
C5—C6	1.399 (3)	C17—C22	1.401 (3)
C5—C8	1.464 (3)	C18—C19	1.377 (3)
C6—C7	1.379 (3)	C18—H18	0.9500
C6—H6	0.9500	C19—C20	1.398 (4)
C7—H7	0.9500	C19—H19	0.9500
C8—C9	1.344 (3)	C20—C21	1.389 (3)
C8—H8	0.9500	C20—C23	1.504 (3)
C9—C10	1.483 (3)	C21—C22	1.387 (3)
C9—C14	1.515 (3)	C21—H21	0.9500
C10—O11	1.228 (3)	C22—H22	0.9500
C10—C12	1.488 (3)	C23—H23A	0.9800
C12—C16	1.335 (3)	C23—H23B	0.9800
C12—C13	1.506 (3)	C23—H23C	0.9800
C13—C14	1.543 (3)

C2—C1—H1A	109.5	H13A—C13—H13B	108.8
C2—C1—H1B	109.5	C9—C14—C15	109.94 (18)
H1A—C1—H1B	109.5	C9—C14—C13	104.13 (17)
C2—C1—H1C	109.5	C15—C14—C13	109.97 (18)
H1A—C1—H1C	109.5	C9—C14—H14	110.9
H1B—C1—H1C	109.5	C15—C14—H14	110.9
C3—C2—C7	116.8 (2)	C13—C14—H14	110.9
C3—C2—C1	121.6 (2)	C14—C15—H15A	109.5
C7—C2—C1	121.6 (2)	C14—C15—H15B	109.5
C4—C3—C2	121.6 (2)	H15A—C15—H15B	109.5
C4—C3—H3	119.2	C14—C15—H15C	109.5
C2—C3—H3	119.2	H15A—C15—H15C	109.5
C3—C4—C5	121.4 (2)	H15B—C15—H15C	109.5
C3—C4—H4	119.3	C12—C16—C17	130.9 (2)
C5—C4—H4	119.3	C12—C16—H16	114.6
C6—C5—C4	117.3 (2)	C17—C16—H16	114.6
C6—C5—C8	125.0 (2)	C18—C17—C22	117.6 (2)
C4—C5—C8	117.7 (2)	C18—C17—C16	118.7 (2)
C7—C6—C5	120.5 (2)	C22—C17—C16	123.6 (2)
C7—C6—H6	119.7	C19—C18—C17	121.5 (2)
C5—C6—H6	119.7	C19—C18—H18	119.3
C6—C7—C2	122.3 (2)	C17—C18—H18	119.3
C6—C7—H7	118.9	C18—C19—C20	121.1 (2)
C2—C7—H7	118.9	C18—C19—H19	119.5
C9—C8—C5	131.2 (2)	C20—C19—H19	119.5
C9—C8—H8	114.4	C21—C20—C19	117.7 (2)
C5—C8—H8	114.4	C21—C20—C23	121.1 (2)
C8—C9—C10	120.4 (2)	C19—C20—C23	121.2 (2)
C8—C9—C14	131.9 (2)	C22—C21—C20	121.6 (2)
C10—C9—C14	107.62 (18)	C22—C21—H21	119.2
O11—C10—C9	126.3 (2)	C20—C21—H21	119.2
O11—C10—C12	125.5 (2)	C21—C22—C17	120.6 (2)
C9—C10—C12	108.17 (19)	C21—C22—H22	119.7
C16—C12—C10	121.0 (2)	C17—C22—H22	119.7
C16—C12—C13	131.3 (2)	C20—C23—H23A	109.5
C10—C12—C13	107.73 (18)	C20—C23—H23B	109.5
C12—C13—C14	105.37 (18)	H23A—C23—H23B	109.5
C12—C13—H13A	110.7	C20—C23—H23C	109.5
C14—C13—H13A	110.7	H23A—C23—H23C	109.5
C12—C13—H13B	110.7	H23B—C23—H23C	109.5
C14—C13—H13B	110.7

C7—C2—C3—C4	1.4 (4)	C16—C12—C13—C14	160.9 (2)
C1—C2—C3—C4	−178.5 (2)	C10—C12—C13—C14	−19.5 (2)
C2—C3—C4—C5	0.8 (4)	C8—C9—C14—C15	−88.7 (3)
C3—C4—C5—C6	−2.4 (4)	C10—C9—C14—C15	93.9 (2)
C3—C4—C5—C8	176.5 (2)	C8—C9—C14—C13	153.5 (2)
C4—C5—C6—C7	1.9 (3)	C10—C9—C14—C13	−23.9 (2)
C8—C5—C6—C7	−176.9 (2)	C12—C13—C14—C9	26.3 (2)
C5—C6—C7—C2	0.3 (4)	C12—C13—C14—C15	−91.4 (2)
C3—C2—C7—C6	−2.0 (4)	C10—C12—C16—C17	−178.0 (2)
C1—C2—C7—C6	178.0 (2)	C13—C12—C16—C17	1.6 (4)
C6—C5—C8—C9	13.9 (4)	C12—C16—C17—C18	−166.3 (2)
C4—C5—C8—C9	−164.9 (2)	C12—C16—C17—C22	16.4 (4)
C5—C8—C9—C10	175.1 (2)	C22—C17—C18—C19	−0.8 (3)
C5—C8—C9—C14	−2.0 (4)	C16—C17—C18—C19	−178.30 (19)
C8—C9—C10—O11	14.6 (3)	C17—C18—C19—C20	1.5 (3)
C14—C9—C10—O11	−167.6 (2)	C18—C19—C20—C21	−1.3 (3)
C8—C9—C10—C12	−165.43 (19)	C18—C19—C20—C23	178.0 (2)
C14—C9—C10—C12	12.3 (2)	C19—C20—C21—C22	0.4 (3)
O11—C10—C12—C16	4.3 (3)	C23—C20—C21—C22	−178.8 (2)
C9—C10—C12—C16	−175.62 (19)	C20—C21—C22—C17	0.2 (3)
O11—C10—C12—C13	−175.4 (2)	C18—C17—C22—C21	0.0 (3)
C9—C10—C12—C13	4.7 (2)	C16—C17—C22—C21	177.3 (2)

Hydrogen-bond geometry (Å, º) top

Cg1 and Cg2 are the centroids of the C2–C7 and C17–C22 rings, respectively.

D—H···A	D—H	H···A	D···A	D—H···A
C1—H1C···Cg1ⁱ	0.98	2.84	3.728 (3)	152
C4—H4···Cg2ⁱⁱ	0.95	2.75	3.574 (2)	146

Symmetry codes: (i) −x+1, −y+1, −z; (ii) x−1/2, −y+1/2, z−1/2.

Antibacterial screening results (zone of inibition, mm) top

Compound	Escherchia coli	Salmonella typhi	Staphylococcus aureus	Bacillus subtilis
MBMCP	07	12	27	14
Penecillin	18	25	40	17
DMSO	–	–	–	–

(-) No antibacterial activity

Funding information

The authors acknowledge the Ministère de l'Enseignement Supérieur et de la Recherche Scientifique of Algeria for financial support.

References

Amoozadeh, A., Rahmani, S. & Nemati, F. (2010). S. Afr. J. Chem. 63, 72–74. Google Scholar
Arshad, I., Ashraf, S., Abbas, A., Hameed, S., Lo, K. M. & Naseer, M. M. (2014). Eur. Chem. Bull. 3, 587–592. CAS Google Scholar
Artico, M., Di Santo, R., Costi, R., Novellino, E., Greco, G., Massa, S., Tramontano, E., Marongiu, M. E., De Montis, A. & La Colla, P. (1998). J. Med. Chem. 41, 3948–3960. Web of Science CrossRef CAS PubMed Google Scholar
Bacon, G. E., Curry, N. A. & Wilson, S. A. (1964). Proc. R. Soc. London Ser. A, 279, 98–110. CrossRef CAS Web of Science Google Scholar
Barry, A. L. (1976). Antimicrobial Susceptibility Test, Principle and Practice, pp. 93–100. Philadelphia, USA: Illus Lea and Fehniger. Google Scholar
Brandenburg, K. & Berndt, M. (2001). DIAMOND. Crystal Impact GbR, Bonn, Germany. Google Scholar
Bruker (2014). SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Bruker (2015). APEX3. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Chu, W. C., Bai, P. Y., Yang, Z. Q., Cui, D. Y., Hua, Y. G., Yang, Y., Yang, Q. Q., Zhang, E. & Qin, S. (2018). Eur. J. Med. Chem. 143, 905–921. CrossRef CAS Google Scholar
Deli, J., Lorand, T., Szabo, D. & Foldesi, A. (1984). Pharmazie, 39, 539–540. CAS PubMed Web of Science Google Scholar
Dhar, D. N. & Barton, D. (1981). Chemistry of Chalcones and Related Compounds, pp. 8–11. New York: Wiley. Google Scholar
Farrugia, L. J. (2012). J. Appl. Cryst. 45, 849–854. Web of Science CrossRef CAS IUCr Journals Google Scholar
Gall, E. L., Texier-Boullet, F. & Hamelin, J. (1999). Synth. Commun. 29, 3651–3657. CrossRef Google Scholar
Geissman, T. A. & Clinton, R. O. (1946). J. Am. Chem. Soc. 68, 697–700. CrossRef CAS Google Scholar
George, A. & Roth, H. J. (1971). Tetrahedron Lett. 12, 4057–4060. CrossRef Google Scholar
Groom, C. R., Bruno, I. J., Lightfoot, M. P. & Ward, S. C. (2016). Acta Cryst. B72, 171–179. Web of Science CrossRef IUCr Journals Google Scholar
Guilford, W. J., Shaw, K. J., Dallas, J. L., Koovakkat, S., Lee, W., Liang, A., Light, D. R., McCarrick, M. A., Whitlow, M., Ye, B. & Morrissey, M. M. (1999). J. Med. Chem. 42, 5415–5425. Web of Science CrossRef PubMed CAS Google Scholar
Rajput, J. K. & Kaur, G. (2012). Tetrahedron Lett. 53, 646–649. CrossRef CAS Google Scholar
Kawamata, J., Inoue, K. & Inabe, T. (1998). Bull. Chem. Soc. Jpn, 71, 2777–2786. Web of Science CrossRef CAS Google Scholar
Mewshaw, R. E. (1989). Tetrahedron Lett. 30, 3753–3756. CrossRef CAS Google Scholar
Nakhaei, A., Morsali, A. & Davoodnia, A. (2017). Russ. J. Gen. Chem. 87, 1073–1078. CrossRef CAS Google Scholar
Piantadosi, C., Hall, I. H., Irvine, J. L. & Carlson, G. L. (1973). J. Med. Chem. 16, 770–775. CrossRef CAS Google Scholar
Ponce, A. G., Fritz, R., del Valle, C. E. & Roura, S. I. (2003). LWT Food Sci. Technol. 36, 679–684. CrossRef CAS Google Scholar
Riadi, Y., Mamouni, R., Azzalou, R., Boulahjar, R., Abrouki, Y., El Haddad, M., Routier, S., Guillaumet, G. & Lazar, S. (2010). Tetrahedron Lett. 51, 6715–6717. CrossRef CAS Google Scholar
Robinson, T. P., Hubbard, R. B. IV, Ehlers, T. J., Arbiser, J. L., Goldsmith, D. J. & Bowen, J. P. (2005). Bioorg. Med. Chem. 13, 4007–4013. CrossRef CAS Google Scholar
Shan, Z. X., Luo, X. X., Hu, L. & Hu, X. Y. (2010). Sci. China: Chem. 53, 1095-1101. Google Scholar
Sheldrick, G. M. (2015a). Acta Cryst. A71, 3–8. Web of Science CrossRef IUCr Journals Google Scholar
Sheldrick, G. M. (2015b). Acta Cryst. C71, 3–8. Web of Science CrossRef IUCr Journals Google Scholar
Shetty, D., Kim, Y. J., Shim, H. & Snyder, J. P. (2015). Molecules, 20, 249–292. CrossRef Google Scholar
Steiner, T. (1996). Crystallogr. Rev. 6, 1–51. CrossRef CAS Google Scholar
Taylor, R. & Kennard, O. (1982). J. Am. Chem. Soc. 104, 5063–5070. CrossRef CAS Web of Science Google Scholar
Theocharis, C. R., Jones, W., Thomas, J. M., Motevalli, M. & Hursthouse, M. B. (1984). J. Chem. Soc. Perkin Trans. 2, pp. 71–76. CrossRef Google Scholar
Vatsadze, S. Z., Manaenkova, M. A., Sviridenkova, N. V., Zyk, N. V., Krut'ko, D. P., Churakov, A. V., Antipin, Yu. M., Howard, J. A. K. & Lang, H. (2006). Russ. Chem. Bull. 55, 1184–1194. CrossRef CAS Google Scholar
Wolff, S. K., Grimwood, D. J., McKinnon, J. J., Jayatilaka, D. & Spackman, M. A. (2007). Crystal Explorer. University of Western Australia, Perth, Australia. Google Scholar
Ziani, N., Lamara, K., Sid, A., Willem, Q., Dassonneville, B. & Demonceau, A. (2013). Eur. J. Chem. 4, 176–179. CrossRef CAS Google Scholar

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