Crystal structure of 3-benzyl-2-[(E)-2-(furan-2-yl)ethen­yl]-2,3-di­hydro­quinazolin-4(1H)-one and 3-benzyl-2-[(E)-2-(thio­phen-2-yl)ethen­yl]-2,3-di­hydro­quinazolin-4(1H)-one from synchrotron X-ray diffraction

The mol­ecular and crystal structures of two 3-benzyl-2-[(E)-2-(2-ar­yl)ethen­yl]-2,3-di­hydro­quinazolin-4-ones – products of three-component reactions between benzyl­amine, isatoic anhydride and furyl- or thienyl-acrolein in the presence of catalytic qu­antity of p-TsOH – were studied by X-ray diffraction.

Abstract

The chiral title compounds, C₂₁H₁₈N₂O₂, (I), and C₂₁H₁₈N₂OS, (II) – products of the three-component reaction between benzyl­amine, isatoic anhydride and furyl- or thienyl-acrolein – are isostructural and form isomorphous racemic crystals. The tetra­hydro­pyrimidine ring in (I) and (II) adopts a sofa conformation. The amino N atom has a trigonal–pyramidal geometry [sum of the bond angles is 347.0° for both (I) and (II)], whereas the amido N atom is flat [sum of the bond angles is 359.3° for both (I) and (II)]. The furyl- and thienylethenyl substituents in (I) and (II) are planar and the conformation about the bridging C=C bond is E. These bulky fragments occupy the axial position at the quaternary C atom of the tetra­hydro­pyrimidine ring, apparently, due to steric reasons. In the crystals, mol­ecules of (I) and (II) form hydrogen-bonded helicoidal chains propagating along [010] by strong inter­molecular N—H⋯O hydrogen bonds.

Chemical context  

The synthesis and chemistry of quinazoline and quinazolinone derivatives have remained at the focus of biochemical research over the past decade owing to their high and diverse physiological activities (for recent reviews, see: Jafari et al., 2016 ▸; Wang & Gao, 2013 ▸; Selvam & Kumar, 2011 ▸). A large part of these studies has been aimed at the development of methods for the synthesis of 2-aryl-substituted quinazolines. However, 2-ethenylquinazolines are much more attractive synthons for subsequent modifications of the heterocyclic skeleton.

Two synthetic approaches A and B (Fig. 1 ▸) are known for 2-ethenylphenyl-substituted heterocycles (Mohammadpoor-Baltork et al., 2011 ▸; Ramesh et al., 2012 ▸; Cheng et al., 2012 ▸; Ghorbani-Choghamarani & Norouzi, 2014 ▸; Zhang et al., 2014 ▸, 2016 ▸; Deng et al., 2015 ▸; Noori et al., 2017 ▸; Alinezhad et al., 2017 ▸). However, up to date, there is practically no information about the synthesis of 2-ethenylhetaryl-substituted quinazolines (Frackenpohl et al., 2016 ▸; Zaytsev et al., 2015 ▸; Celltech & Limited, 2004 ▸; Kundu & Chaudhuri, 2001 ▸). Taking into account the high biological activity of furan, thio­phene, and pyrrole derivatives, it appeared very attractive to obtain quinazolines of this type. It is well known that, for biological researches, the conformation of a mol­ecule plays a key role. In this connection, the present work is aimed at revealing the conformational features of 2-ethenylhetaryl-substituted quinazolines.

Figure 1.

The two general methods, A and B, for the synthesis of 3-benzyl-2-[(E)-2-(2-ar­yl)ethen­yl]-2,3-di­hydro­quinazolin-4(1H)-ones (I) and (II).

Using method A, the three-component reaction between benzyl­amine, isatoic anhydride and furyl- or thienylacrolein in the presence of a catalytic qu­antity of p-TsOH afforded the 3-benzyl-2-[(E)-2-(furan-2-yl)ethen­yl]-2,3-di­hydro­quinazolin-4(1H)-one (I) and 3-benzyl-2-[(E)-2-(thio­phen-2-yl)ethen­yl]-2,3-di­hydro­quinazolin-4(1H)-one (II) in moderate yields.

Structural commentary  

Compounds (I), C₂₁H₁₈N₂O₂, and (II), C₂₁H₁₈N₂OS – the products of the three-component reaction between benzyl­amine, isatoic anhydride and furyl- or thienyl-acrolein are isostructural and crystallize in the ortho­rhom­bic space group Pbca (Figs. 2 ▸ and 3 ▸).

Figure 2.

The mol­ecular structure of (I). Displacement ellipsoids are shown at the 50% probability level. H atoms are presented as small spheres of arbitrary radius.

Figure 3.

The mol­ecular structure of (II). Displacement ellipsoids are shown at the 50% probability level. H atoms are presented as small spheres of arbitrary radius.

The tetra­hydro­pyrimidine ring in (I) and (II) adopts a sofa conformation, with the C2 carbon atom deviating from the mean plane of the other atoms of the ring by 0.526 (1) and 0.528 (2) Å for (I) and (II), respectively. The nitro­gen N1 atom has a trigonal-pyramidal geometry [sum of the bond angles is 347° for both (I) and (II)], whereas the nitro­gen N3 atom is flattened [sum of the bond angles is 359.3° for both (I) and (II)]. The furyl- and thienyl-ethenyl substituents in (I) and (II) are planar and have the E-conformation at the C9=C10 double bond. Remarkably, these bulky fragments occupy the axial position at the quaternary C2 carbon atom of the tetra­hydro­pyrimidine ring, apparently, due to the steric inter­action with the benzyl substituent.

The mol­ecules of (I) and (II) possess an asymmetric center at the C2 carbon atom. The crystals of (I) and (II) are racemates.

Supra­molecular features  

In the crystals of (I) and (II), mol­ecules form hydrogen-bonded helicoidal chains propagating along the [010] direction by strong inter­molecular N—H⋯O hydrogen bonds (Tables 1 ▸ and 2 ▸, Figs. 4 ▸ and 5 ▸).

Table 1. Hydrogen-bond geometry (Å, °) for (I) .

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1⋯O2i	0.897 (15)	2.111 (15)	2.9557 (14)	156.7 (12)

Symmetry code: (i) .

Table 2. Hydrogen-bond geometry (Å, °) for (II) .

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1⋯O1i	0.87 (3)	2.14 (3)	2.978 (2)	161 (2)

Symmetry code: (i) .

Figure 4.

The crystal structure of (I), demonstrating the hydrogen-bonded helicoidal chains propagating in the [010] direction. Dashed lines indicate the inter­molecular N—H⋯O hydrogen bonds.

Figure 5.

The crystal structure of (II), demonstrating the hydrogen-bonded helicoidal chains propagating in the [010] direction. Dashed lines indicate the inter­molecular N—H⋯O hydrogen bonds.

Synthesis and crystallization  

3-Benzyl-2-[(E)-2-(2-ar­yl)ethen­yl]-2,3-di­hydro­quinazolin-4-ones (I) and (II) were synthesized using a method similar to the recently described procedure (Fig. 6 ▸) (Zaytsev et al., 2017 ▸).

Figure 6.

Syntheses of 3-benzyl-2-[(E)-2-(furan-2-yl)ethen­yl]-2,3-di­hydro­quin­az­o­lin-4(1H)-one (I) and 3-benzyl-2-[(E)-2-(thio­phen-2-yl)ethen­yl]-2,3-di­hydro­quinazolin-4(1H)-one (II).

General procedure. p-TsOH (0.79 g, 4.6 mmol) was added to a mixture of isatoic anhydride (1.5 g, 9.2 mmol), benzyl­amine (1.2 mL, 11.0 mmol), and furyl- or thienylacrolein (9.2 mmol) in 50 mL EtOH. The reaction mixture was heated under reflux for 4 h. The progress of the reaction was monitored by TLC. When the reaction completed, the mixture was diluted with H₂O (100 mL) and extracted with EtOAc (3 × 50 mL). The organic layers were combined, dried (MgSO₄), concentrated in vacuo and the residue was purified by column chromatography on SiO₂ (3 × 20 cm) using hexane and then EtOAc/hexane (1/10→1/5) mixtures as eluent. The resulting product was recrystallized from a mixture of hexa­ne–EtOAc [for (I)] or EtOAc–EtOH [for (II)] to afford the analytically pure samples of the target products.

3-Benzyl-2-[( E )-2-(furan-2-yl)ethen­yl]-2,3-di­hydro­quin­az­olin-4(1 H )-one (I). Colourless prisms. Yield is 2.31 g (76%). M.p. = 427.1 K (hexa­ne–EtOAc). IR (KBr), ν (cm⁻¹): 3376, 1645, 1611. ¹H NMR (CDCl₃, 600.2 MHz, 301 K): δ = 3.86 (d, 1H, CH₂N, J = 15.1), 4.61 (br s, 1H, NH), 4.98 (br d, 1H, H2, J = 5.5), 5.59 (d, 1H, CH₂N, J = 15.1), 6.24 (d, 1H, H3, furyl, J = 3.1), 6.25 (d, 1H, CH=CH, J = 6.2), 6.34 (dd, 1H, H4, furyl, J = 2.1, J = 3.1), 6.59 (d, 1H, H8, J = 8.2), 6.83 (t, 1H, H6, J = 7.6), 7.24–7.34 (m, 7H, HAr), 7.96 (dd, 1H, H5, J = 1.4, J = 7.6). ¹³C NMR (CDCl₃, 100 MHz, 301 K): δ = 46.7 (CH₂N), 69.8 (C2), 109.9, 111.5, 114.8, 119.1, 121.1, 123.6, 127.5, 127.9, 128.7, 128.7, 133.6, 115.7, 136.9, 145.4, 151.1, 142.7 (CAr, CH=CH), 162.9 (NCO). MS (EI, 70 eV): m/z = 330 [M]⁺ (93), 239 (100), 197 (71), 170 (20), 160 (19), 120 (40), 106 (55), 91 (81), 76 (58), 65 (45), 51 (37), 43 (20).

3-Benzyl-2-[( E )-2-(thio­phen-2-yl)ethen­yl]-2,3-di­hydro­quinazolin-4(1 H )-one (II). Yellow prisms. Yield is 2.39 g (75%). M.p. = 434.1–435.1 K (EtOAc–EtOH). IR (KBr), ν (cm⁻¹): 3306, 1625, 1506. ¹H NMR (DMSO, 600.2 MHz, 301 K): δ = 4.05 (d, 1H, CH₂N, J = 15.8), 5.15-5.17 (m, 2H, H2, CH₂N), 6.00 (dd, 1H, CH=CH, J = 6.8, J = 15.1), 6.69–6.76 (m, 3H, H6, H8, CH=CH), 6.96 (dd, 1H, H4, thienyl, J = 3.4, J = 5.2), 7.07 (br d, 1H, H3, thienyl, J = 3.4), 7.07 (br s, 1H, NH), 7.23–7.32 (m, 6H, HAr), 7.38 (br d, 1H, H2, thienyl, J = 5.2), 7.66 (dd, 1H, H5, J = 1.4, J = 8.2). ¹³C NMR (DMSO, 150.9 MHz, 301 K): δ = 47.0 (CH₂N), 69.6 (C2), 115.1, 115.2, 118.0, 125.7 (2C), 126.4, 127.7, 127.9, 128.1, 128.3, 128.4, 129.0, 134.0, 138.3, 140.8, 147.1 (CAr, CH=CH), 162.4 (NCO). MS (EI, 70 eV): m/z = 346 [M]⁺ (76), 255 (100), 237 (93), 213 (37), 106 (14), 91 (99), 65 (13).

Refinement  

Crystal data, data collection and structure refinement details are summarized in Table 3 ▸. X-ray diffraction studies were carried out on the "Belok" beamline of the National Research Center "Kurchatov Institute" (Moscow, Russian Federation) using a Rayonix SX165 CCD detector. A total of 360 images for each compounds were collected using an oscillation range of 1.0° (φ scan mode, two different crystal orientations) and corrected for absorption using the SCALA program (Evans, 2006 ▸). The data were indexed, integrated and scaled using the utility iMOSFLM in the CCP4 program (Battye et al., 2011 ▸).

Table 3. Experimental details.

	(I)	(II)
Crystal data
Chemical formula	C21H18N2O2	C21H18N2OS
M r	330.37	346.43
Crystal system, space group	Orthorhombic, P b c a	Orthorhombic, P b c a
Temperature (K)	100	100
a, b, c (Å)	14.292 (3), 13.729 (3), 17.230 (3)	14.245 (3), 13.855 (3), 17.629 (4)
V (Å3)	3380.8 (12)	3479.3 (13)
Z	8	8
Radiation type	Synchrotron, λ = 0.96260 Å	Synchrotron, λ = 0.96260 Å
μ (mm−1)	0.17	0.44
Crystal size (mm)	0.30 × 0.25 × 0.15	0.30 × 0.25 × 0.25
Data collection
Diffractometer	Rayonix SX165 CCD	Rayonix SX165 CCD
Absorption correction	Multi-scan (SCALA; Evans, 2006 ▸)	Multi-scan (SCALA; Evans, 2006 ▸)
T min, T max	0.940, 0.970	0.870, 0.890
No. of measured, independent and observed [I > 2σ(I)] reflections	34783, 3705, 3017	20322, 3594, 3024
R int	0.079	0.064
(sin θ/λ)max (Å−1)	0.646	0.647
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.042, 0.112, 1.08	0.050, 0.147, 1.08
No. of reflections	3705	3594
No. of parameters	230	217
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement	H atoms treated by a mixture of independent and constrained refinement
Δρmax, Δρmin (e Å−3)	0.28, −0.17	0.71, −0.72

Computer programs: Marccd (Doyle, 2011 ▸), i MOSFLM (Battye et al., 2011 ▸), SHELXT (Sheldrick, 2015 ▸), SHELXL2014 (Sheldrick, 2015 ▸) and SHELXTL (Sheldrick, 2015 ▸).

The hydrogen atoms of the amino groups were localized in difference-Fourier maps and refined isotropically with fixed displacement parameters [U _ĩso(H) = 1.2U _eq(N)]. The other hydrogen atoms were placed in calculated positions with C—H = 0.95–1.00 Å and refined in the riding model with fixed isotropic displacement parameters [U _ĩso(H) = 1.2U _eq(C)].

A relatively large number of reflections (a few dozen) were omitted due to the following reasons: (1) In order to achieve better I/σ statistics for high-angle reflections we selected a larger exposure time, which resulted in some intensity overloads in the low-angle part of the area. These corrupted intensities were excluded from final steps of the refinement. (2) In the current setup of the instrument, the low-temperature device eclipses a small region of the detector near its high-angle limit. This resulted in zero intensity of some reflections. (3) In the case of (II), the quality of the single crystal chosen for the diffraction experiment was far from perfect. Some systematic intensity deviations can be due to extinction and defects present in the crystal.

Supplementary Material

CCDC references: 1589395, 1589394

Additional supporting information: crystallographic information; 3D view; checkCIF report

supplementary crystallographic information

3-Benzyl-2-[(E)-2-(furan-2-yl)ethenyl]-2,3-dihydroquinazolin-4(1H)-one (I) . Crystal data

C21H18N2O2	Dx = 1.298 Mg m−3
Mr = 330.37	Synchrotron radiation, λ = 0.96260 Å
Orthorhombic, Pbca	Cell parameters from 600 reflections
a = 14.292 (3) Å	θ = 3.0–36.0°
b = 13.729 (3) Å	µ = 0.17 mm−1
c = 17.230 (3) Å	T = 100 K
V = 3380.8 (12) Å3	Prism, colourless
Z = 8	0.30 × 0.25 × 0.15 mm
F(000) = 1392

3-Benzyl-2-[(E)-2-(furan-2-yl)ethenyl]-2,3-dihydroquinazolin-4(1H)-one (I) . Data collection

Rayonix SX165 CCD diffractometer	3017 reflections with I > 2σ(I)
/f scan	Rint = 0.079
Absorption correction: multi-scan (Scala; Evans, 2006)	θmax = 38.5°, θmin = 3.2°
Tmin = 0.940, Tmax = 0.970	h = −18→18
34783 measured reflections	k = −17→17
3705 independent reflections	l = −21→21

3-Benzyl-2-[(E)-2-(furan-2-yl)ethenyl]-2,3-dihydroquinazolin-4(1H)-one (I) . Refinement

Refinement on F2	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: mixed
R[F2 > 2σ(F2)] = 0.042	H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.112	w = 1/[σ2(Fo2) + (0.0539P)2 + 0.539P] where P = (Fo2 + 2Fc2)/3
S = 1.08	(Δ/σ)max = 0.001
3705 reflections	Δρmax = 0.28 e Å−3
230 parameters	Δρmin = −0.17 e Å−3
0 restraints	Extinction correction: SHELXL2014 (Sheldrick, 2015), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4
Primary atom site location: difference Fourier map	Extinction coefficient: 0.0041 (8)

3-Benzyl-2-[(E)-2-(furan-2-yl)ethenyl]-2,3-dihydroquinazolin-4(1H)-one (I) . Special details

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

3-Benzyl-2-[(E)-2-(furan-2-yl)ethenyl]-2,3-dihydroquinazolin-4(1H)-one (I) . Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
O1	0.94874 (5)	0.38755 (6)	0.80431 (5)	0.0290 (2)
O2	0.78370 (6)	0.74574 (6)	0.58408 (5)	0.0324 (2)
N1	0.75445 (7)	0.45360 (8)	0.55253 (6)	0.0259 (3)
H1	0.7542 (10)	0.3883 (11)	0.5507 (8)	0.031*
C2	0.73864 (8)	0.49053 (9)	0.63117 (7)	0.0245 (3)
H2	0.6772	0.4641	0.6493	0.029*
N3	0.72977 (6)	0.59857 (7)	0.62784 (6)	0.0241 (2)
C4	0.78346 (8)	0.65486 (9)	0.57961 (7)	0.0243 (3)
C4A	0.83803 (7)	0.60140 (8)	0.51944 (7)	0.0239 (3)
C5	0.89993 (8)	0.65246 (9)	0.47069 (8)	0.0287 (3)
H5	0.9115	0.7196	0.4800	0.034*
C6	0.94453 (8)	0.60605 (10)	0.40899 (8)	0.0336 (3)
H6	0.9863	0.6409	0.3763	0.040*
C7	0.92651 (9)	0.50687 (10)	0.39610 (8)	0.0343 (3)
H7	0.9564	0.4747	0.3541	0.041*
C8	0.86562 (8)	0.45466 (9)	0.44362 (7)	0.0296 (3)
H8	0.8545	0.3875	0.4338	0.036*
C8A	0.82023 (7)	0.50135 (9)	0.50644 (7)	0.0240 (3)
C9	0.81224 (8)	0.45883 (8)	0.68936 (7)	0.0243 (3)
H9	0.8760	0.4743	0.6798	0.029*
C10	0.78969 (8)	0.40943 (9)	0.75408 (7)	0.0253 (3)
H10	0.7251	0.3963	0.7618	0.030*
C11	0.85346 (8)	0.37393 (9)	0.81353 (7)	0.0252 (3)
C12	0.83634 (9)	0.32594 (9)	0.88182 (7)	0.0295 (3)
H12	0.7769	0.3077	0.9017	0.035*
C13	0.92549 (9)	0.30860 (9)	0.91761 (8)	0.0328 (3)
H13	0.9367	0.2768	0.9657	0.039*
C14	0.99049 (9)	0.34671 (9)	0.86917 (8)	0.0321 (3)
H14	1.0560	0.3456	0.8784	0.039*
C15	0.67156 (8)	0.64346 (9)	0.68802 (7)	0.0271 (3)
H15A	0.6881	0.7133	0.6921	0.032*
H15B	0.6860	0.6125	0.7385	0.032*
C16	0.56621 (8)	0.63468 (8)	0.67274 (7)	0.0232 (3)
C17	0.52921 (8)	0.59729 (9)	0.60354 (7)	0.0255 (3)
H17	0.5702	0.5750	0.5639	0.031*
C18	0.43186 (8)	0.59258 (9)	0.59243 (8)	0.0287 (3)
H18	0.4074	0.5664	0.5456	0.034*
C19	0.37128 (8)	0.62615 (9)	0.64965 (8)	0.0319 (3)
H19	0.3055	0.6233	0.6418	0.038*
C20	0.40750 (9)	0.66416 (9)	0.71896 (8)	0.0316 (3)
H20	0.3663	0.6876	0.7580	0.038*
C21	0.50438 (8)	0.66754 (9)	0.73049 (7)	0.0272 (3)
H21	0.5286	0.6923	0.7779	0.033*

3-Benzyl-2-[(E)-2-(furan-2-yl)ethenyl]-2,3-dihydroquinazolin-4(1H)-one (I) . Atomic displacement parameters (Ų)

	U11	U22	U33	U12	U13	U23
O1	0.0247 (4)	0.0273 (5)	0.0350 (5)	−0.0009 (3)	−0.0026 (4)	0.0020 (4)
O2	0.0333 (5)	0.0183 (5)	0.0457 (6)	0.0014 (3)	0.0002 (4)	−0.0013 (4)
N1	0.0288 (5)	0.0170 (5)	0.0319 (6)	−0.0020 (4)	−0.0042 (4)	−0.0008 (4)
C2	0.0222 (5)	0.0201 (6)	0.0311 (7)	−0.0013 (4)	−0.0017 (5)	0.0008 (5)
N3	0.0208 (5)	0.0193 (5)	0.0322 (6)	0.0012 (4)	−0.0011 (4)	−0.0016 (4)
C4	0.0208 (5)	0.0188 (6)	0.0335 (7)	0.0010 (4)	−0.0060 (5)	0.0002 (5)
C4A	0.0200 (5)	0.0213 (6)	0.0303 (7)	0.0016 (4)	−0.0045 (5)	0.0009 (5)
C5	0.0231 (5)	0.0247 (7)	0.0385 (7)	0.0003 (5)	−0.0042 (5)	0.0036 (5)
C6	0.0256 (6)	0.0383 (8)	0.0370 (8)	0.0006 (5)	0.0015 (5)	0.0044 (6)
C7	0.0283 (6)	0.0421 (8)	0.0326 (7)	0.0059 (6)	−0.0002 (5)	−0.0057 (6)
C8	0.0274 (6)	0.0263 (7)	0.0351 (7)	0.0033 (5)	−0.0062 (5)	−0.0055 (5)
C8A	0.0215 (5)	0.0219 (6)	0.0285 (7)	0.0018 (4)	−0.0075 (5)	0.0007 (5)
C9	0.0214 (5)	0.0212 (6)	0.0305 (7)	−0.0006 (4)	−0.0013 (5)	−0.0027 (5)
C10	0.0224 (5)	0.0225 (6)	0.0311 (7)	0.0001 (4)	−0.0002 (5)	−0.0031 (5)
C11	0.0248 (5)	0.0220 (6)	0.0289 (7)	−0.0002 (5)	0.0008 (5)	−0.0042 (5)
C12	0.0326 (6)	0.0285 (7)	0.0274 (7)	−0.0013 (5)	0.0018 (5)	−0.0019 (5)
C13	0.0430 (7)	0.0279 (7)	0.0276 (7)	−0.0010 (6)	−0.0090 (6)	−0.0003 (5)
C14	0.0308 (6)	0.0262 (7)	0.0394 (8)	0.0004 (5)	−0.0122 (6)	0.0010 (6)
C15	0.0234 (6)	0.0266 (7)	0.0312 (7)	0.0010 (5)	−0.0025 (5)	−0.0047 (5)
C16	0.0232 (5)	0.0192 (6)	0.0273 (6)	0.0000 (4)	−0.0018 (5)	0.0032 (5)
C17	0.0263 (6)	0.0234 (6)	0.0268 (7)	0.0019 (5)	−0.0015 (5)	0.0021 (5)
C18	0.0287 (6)	0.0253 (7)	0.0320 (7)	−0.0016 (5)	−0.0070 (5)	0.0049 (5)
C19	0.0200 (5)	0.0332 (7)	0.0426 (8)	−0.0018 (5)	−0.0019 (5)	0.0100 (6)
C20	0.0275 (6)	0.0312 (7)	0.0360 (8)	0.0004 (5)	0.0090 (5)	0.0063 (6)
C21	0.0296 (6)	0.0246 (7)	0.0274 (7)	−0.0016 (5)	0.0018 (5)	0.0033 (5)

3-Benzyl-2-[(E)-2-(furan-2-yl)ethenyl]-2,3-dihydroquinazolin-4(1H)-one (I) . Geometric parameters (Å, º)

O1—C11	1.3836 (14)	C9—H9	0.9500
O1—C14	1.3854 (16)	C10—C11	1.4551 (17)
O2—C4	1.2501 (15)	C10—H10	0.9500
N1—C8A	1.3943 (16)	C11—C12	1.3707 (18)
N1—C2	1.4643 (17)	C12—C13	1.4354 (18)
N1—H1	0.897 (15)	C12—H12	0.9500
C2—N3	1.4898 (16)	C13—C14	1.3540 (19)
C2—C9	1.5169 (16)	C13—H13	0.9500
C2—H2	1.0000	C14—H14	0.9500
N3—C4	1.3699 (16)	C15—C16	1.5334 (16)
N3—C15	1.4653 (15)	C15—H15A	0.9900
C4—C4A	1.4905 (17)	C15—H15B	0.9900
C4A—C5	1.4069 (17)	C16—C17	1.4017 (17)
C4A—C8A	1.4149 (17)	C16—C21	1.4051 (17)
C5—C6	1.3938 (19)	C17—C18	1.4058 (16)
C5—H5	0.9500	C17—H17	0.9500
C6—C7	1.403 (2)	C18—C19	1.3907 (18)
C6—H6	0.9500	C18—H18	0.9500
C7—C8	1.3934 (19)	C19—C20	1.4023 (19)
C7—H7	0.9500	C19—H19	0.9500
C8—C8A	1.4154 (17)	C20—C21	1.3996 (17)
C8—H8	0.9500	C20—H20	0.9500
C9—C10	1.3445 (17)	C21—H21	0.9500
C11—O1—C14	106.06 (9)	C9—C10—H10	116.5
C8A—N1—C2	117.92 (10)	C11—C10—H10	116.5
C8A—N1—H1	116.9 (9)	C12—C11—O1	109.83 (10)
C2—N1—H1	112.2 (9)	C12—C11—C10	130.80 (11)
N1—C2—N3	108.80 (9)	O1—C11—C10	119.37 (10)
N1—C2—C9	113.91 (9)	C11—C12—C13	106.86 (11)
N3—C2—C9	111.72 (9)	C11—C12—H12	126.6
N1—C2—H2	107.4	C13—C12—H12	126.6
N3—C2—H2	107.4	C14—C13—C12	106.27 (11)
C9—C2—H2	107.4	C14—C13—H13	126.9
C4—N3—C15	120.66 (10)	C12—C13—H13	126.9
C4—N3—C2	122.51 (9)	C13—C14—O1	110.99 (11)
C15—N3—C2	116.09 (10)	C13—C14—H14	124.5
O2—C4—N3	121.82 (11)	O1—C14—H14	124.5
O2—C4—C4A	122.20 (11)	N3—C15—C16	113.75 (10)
N3—C4—C4A	115.92 (10)	N3—C15—H15A	108.8
C5—C4A—C8A	120.15 (11)	C16—C15—H15A	108.8
C5—C4A—C4	119.93 (11)	N3—C15—H15B	108.8
C8A—C4A—C4	119.61 (10)	C16—C15—H15B	108.8
C6—C5—C4A	121.02 (12)	H15A—C15—H15B	107.7
C6—C5—H5	119.5	C17—C16—C21	118.87 (11)
C4A—C5—H5	119.5	C17—C16—C15	123.05 (11)
C5—C6—C7	118.70 (12)	C21—C16—C15	118.07 (11)
C5—C6—H6	120.6	C16—C17—C18	120.40 (11)
C7—C6—H6	120.6	C16—C17—H17	119.8
C8—C7—C6	121.38 (12)	C18—C17—H17	119.8
C8—C7—H7	119.3	C19—C18—C17	120.28 (12)
C6—C7—H7	119.3	C19—C18—H18	119.9
C7—C8—C8A	120.18 (12)	C17—C18—H18	119.9
C7—C8—H8	119.9	C18—C19—C20	119.82 (11)
C8A—C8—H8	119.9	C18—C19—H19	120.1
N1—C8A—C4A	119.18 (11)	C20—C19—H19	120.1
N1—C8A—C8	122.12 (11)	C21—C20—C19	119.90 (12)
C4A—C8A—C8	118.57 (11)	C21—C20—H20	120.1
C10—C9—C2	121.78 (10)	C19—C20—H20	120.1
C10—C9—H9	119.1	C20—C21—C16	120.72 (12)
C2—C9—H9	119.1	C20—C21—H21	119.6
C9—C10—C11	127.06 (11)	C16—C21—H21	119.6
C8A—N1—C2—N3	45.76 (13)	C7—C8—C8A—C4A	0.11 (17)
C8A—N1—C2—C9	−79.59 (13)	N1—C2—C9—C10	−122.41 (12)
N1—C2—N3—C4	−38.41 (13)	N3—C2—C9—C10	113.81 (12)
C9—C2—N3—C4	88.20 (13)	C2—C9—C10—C11	179.09 (11)
N1—C2—N3—C15	151.40 (9)	C14—O1—C11—C12	−0.15 (13)
C9—C2—N3—C15	−81.99 (12)	C14—O1—C11—C10	179.98 (10)
C15—N3—C4—O2	−1.24 (16)	C9—C10—C11—C12	177.81 (13)
C2—N3—C4—O2	−171.00 (10)	C9—C10—C11—O1	−2.35 (18)
C15—N3—C4—C4A	−178.63 (9)	O1—C11—C12—C13	0.14 (14)
C2—N3—C4—C4A	11.61 (15)	C10—C11—C12—C13	179.99 (12)
O2—C4—C4A—C5	6.86 (17)	C11—C12—C13—C14	−0.07 (14)
N3—C4—C4A—C5	−175.76 (10)	C12—C13—C14—O1	−0.02 (15)
O2—C4—C4A—C8A	−166.71 (11)	C11—O1—C14—C13	0.10 (14)
N3—C4—C4A—C8A	10.66 (15)	C4—N3—C15—C16	111.21 (12)
C8A—C4A—C5—C6	0.12 (17)	C2—N3—C15—C16	−78.40 (13)
C4—C4A—C5—C6	−173.42 (11)	N3—C15—C16—C17	−6.96 (16)
C4A—C5—C6—C7	0.08 (18)	N3—C15—C16—C21	174.31 (10)
C5—C6—C7—C8	−0.18 (19)	C21—C16—C17—C18	−0.21 (17)
C6—C7—C8—C8A	0.08 (19)	C15—C16—C17—C18	−178.93 (11)
C2—N1—C8A—C4A	−27.67 (15)	C16—C17—C18—C19	0.82 (18)
C2—N1—C8A—C8	156.49 (11)	C17—C18—C19—C20	−0.48 (18)
C5—C4A—C8A—N1	−176.20 (10)	C18—C19—C20—C21	−0.45 (18)
C4—C4A—C8A—N1	−2.63 (15)	C19—C20—C21—C16	1.06 (18)
C5—C4A—C8A—C8	−0.21 (16)	C17—C16—C21—C20	−0.73 (17)
C4—C4A—C8A—C8	173.35 (10)	C15—C16—C21—C20	178.06 (11)
C7—C8—C8A—N1	175.97 (11)

3-Benzyl-2-[(E)-2-(furan-2-yl)ethenyl]-2,3-dihydroquinazolin-4(1H)-one (I) . Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
N1—H1···O2i	0.897 (15)	2.111 (15)	2.9557 (14)	156.7 (12)

Symmetry code: (i) −x+3/2, y−1/2, z.

3-Benzyl-2-[(E)-2-(thiophen-2-yl)ethenyl]-2,3-dihydroquinazolin-4(1H)-one (II) . Crystal data

C21H18N2OS	Dx = 1.323 Mg m−3
Mr = 346.43	Synchrotron radiation, λ = 0.96260 Å
Orthorhombic, Pbca	Cell parameters from 600 reflections
a = 14.245 (3) Å	θ = 3.0–33.0°
b = 13.855 (3) Å	µ = 0.44 mm−1
c = 17.629 (4) Å	T = 100 K
V = 3479.3 (13) Å3	Prism, yellow
Z = 8	0.30 × 0.25 × 0.25 mm
F(000) = 1456

3-Benzyl-2-[(E)-2-(thiophen-2-yl)ethenyl]-2,3-dihydroquinazolin-4(1H)-one (II) . Data collection

Rayonix SX165 CCD diffractometer	3024 reflections with I > 2σ(I)
φ scan	Rint = 0.064
Absorption correction: multi-scan (Scala; Evans, 2006)	θmax = 38.5°, θmin = 3.1°
Tmin = 0.870, Tmax = 0.890	h = −15→16
20322 measured reflections	k = −17→17
3594 independent reflections	l = −15→22

3-Benzyl-2-[(E)-2-(thiophen-2-yl)ethenyl]-2,3-dihydroquinazolin-4(1H)-one (II) . Refinement

Refinement on F2	Primary atom site location: difference Fourier map
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.050	Hydrogen site location: mixed
wR(F2) = 0.147	H atoms treated by a mixture of independent and constrained refinement
S = 1.08	w = 1/[σ2(Fo2) + (0.0669P)2 + 2.4P] where P = (Fo2 + 2Fc2)/3
3594 reflections	(Δ/σ)max < 0.001
217 parameters	Δρmax = 0.71 e Å−3
0 restraints	Δρmin = −0.72 e Å−3

3-Benzyl-2-[(E)-2-(thiophen-2-yl)ethenyl]-2,3-dihydroquinazolin-4(1H)-one (II) . Special details

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

3-Benzyl-2-[(E)-2-(thiophen-2-yl)ethenyl]-2,3-dihydroquinazolin-4(1H)-one (II) . Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
S1	0.02475 (4)	0.39698 (3)	0.79544 (3)	0.02956 (19)
O1	0.22041 (10)	0.74793 (9)	0.57892 (8)	0.0307 (3)
N1	0.25131 (12)	0.45803 (11)	0.55151 (9)	0.0249 (4)
H1	0.2524 (17)	0.3954 (19)	0.5496 (12)	0.030*
C2	0.26696 (14)	0.49600 (12)	0.62814 (11)	0.0244 (4)
H2	0.3287	0.4706	0.6463	0.029*
N3	0.27450 (11)	0.60304 (10)	0.62410 (9)	0.0229 (4)
C4	0.22059 (13)	0.65770 (13)	0.57606 (10)	0.0231 (4)
C4A	0.16533 (14)	0.60308 (12)	0.51890 (10)	0.0228 (4)
C5	0.10052 (15)	0.65191 (14)	0.47233 (11)	0.0276 (4)
H5	0.0882	0.7184	0.4810	0.033*
C6	0.05414 (17)	0.60404 (15)	0.41351 (12)	0.0333 (5)
H6	0.0103	0.6371	0.3823	0.040*
C7	0.07389 (16)	0.50578 (16)	0.40152 (12)	0.0336 (5)
H7	0.0433	0.4727	0.3613	0.040*
C8	0.13683 (15)	0.45601 (14)	0.44685 (11)	0.0301 (5)
H8	0.1487	0.3896	0.4376	0.036*
C8A	0.18367 (13)	0.50393 (12)	0.50701 (10)	0.0234 (4)
C9	0.19299 (14)	0.46488 (12)	0.68451 (11)	0.0244 (4)
H9	0.1295	0.4819	0.6749	0.029*
C10	0.21254 (15)	0.41433 (13)	0.74758 (11)	0.0264 (4)
H10	0.2767	0.3995	0.7566	0.032*
C11	0.14428 (15)	0.37959 (13)	0.80424 (10)	0.0256 (4)
C12	0.16756 (16)	0.32822 (13)	0.87251 (11)	0.0304 (3)
H12	0.2292	0.3110	0.8879	0.037*
C13	0.08295 (16)	0.30680 (14)	0.91398 (11)	0.0304 (3)
H13	0.0830	0.2734	0.9610	0.037*
C14	0.00234 (17)	0.33875 (14)	0.87974 (11)	0.0304 (3)
H14	−0.0588	0.3298	0.9002	0.037*
C15	0.33187 (14)	0.64888 (13)	0.68295 (11)	0.0265 (4)
H15A	0.3163	0.6195	0.7326	0.032*
H15B	0.3156	0.7183	0.6856	0.032*
C16	0.43773 (14)	0.63919 (12)	0.66925 (10)	0.0224 (4)
C17	0.47531 (15)	0.60700 (13)	0.60001 (11)	0.0261 (4)
H17	0.4345	0.5901	0.5595	0.031*
C18	0.57301 (16)	0.59978 (14)	0.59048 (12)	0.0313 (5)
H18	0.5982	0.5765	0.5441	0.038*
C19	0.63326 (16)	0.62705 (15)	0.64953 (13)	0.0345 (5)
H19	0.6993	0.6232	0.6429	0.041*
C20	0.59602 (16)	0.66002 (14)	0.71824 (13)	0.0330 (5)
H20	0.6368	0.6793	0.7581	0.040*
C21	0.49895 (15)	0.66462 (13)	0.72819 (11)	0.0257 (4)
H21	0.4741	0.6852	0.7755	0.031*

3-Benzyl-2-[(E)-2-(thiophen-2-yl)ethenyl]-2,3-dihydroquinazolin-4(1H)-one (II) . Atomic displacement parameters (Ų)

	U11	U22	U33	U12	U13	U23
S1	0.0350 (4)	0.0244 (3)	0.0293 (3)	0.00022 (19)	0.0016 (2)	0.00190 (17)
O1	0.0362 (9)	0.0153 (6)	0.0407 (8)	−0.0011 (6)	−0.0010 (6)	−0.0009 (5)
N1	0.0316 (10)	0.0150 (7)	0.0280 (8)	0.0016 (6)	0.0027 (7)	−0.0011 (6)
C2	0.0263 (11)	0.0178 (8)	0.0292 (9)	0.0015 (7)	0.0010 (8)	0.0008 (7)
N3	0.0224 (9)	0.0165 (7)	0.0298 (8)	−0.0006 (6)	−0.0011 (7)	−0.0017 (6)
C4	0.0232 (10)	0.0177 (8)	0.0284 (9)	0.0001 (7)	0.0038 (7)	0.0004 (6)
C4A	0.0245 (11)	0.0186 (8)	0.0253 (9)	−0.0016 (7)	0.0043 (8)	0.0010 (6)
C5	0.0306 (11)	0.0236 (8)	0.0285 (9)	0.0014 (8)	0.0029 (8)	0.0012 (7)
C6	0.0345 (13)	0.0369 (11)	0.0286 (10)	0.0016 (9)	−0.0012 (9)	0.0013 (8)
C7	0.0358 (12)	0.0365 (11)	0.0287 (10)	−0.0053 (9)	−0.0014 (9)	−0.0059 (8)
C8	0.0363 (12)	0.0237 (9)	0.0305 (10)	−0.0043 (8)	0.0063 (8)	−0.0050 (7)
C8A	0.0249 (10)	0.0203 (8)	0.0250 (9)	−0.0031 (7)	0.0058 (7)	0.0005 (7)
C9	0.0237 (10)	0.0201 (8)	0.0295 (9)	0.0012 (7)	0.0022 (8)	−0.0011 (7)
C10	0.0291 (11)	0.0213 (8)	0.0288 (9)	0.0005 (7)	−0.0004 (8)	−0.0020 (7)
C11	0.0325 (12)	0.0194 (8)	0.0248 (9)	0.0009 (8)	−0.0008 (8)	−0.0018 (7)
C12	0.0409 (7)	0.0244 (5)	0.0260 (5)	0.0018 (5)	0.0042 (5)	−0.0015 (4)
C13	0.0409 (7)	0.0244 (5)	0.0260 (5)	0.0018 (5)	0.0042 (5)	−0.0015 (4)
C14	0.0409 (7)	0.0244 (5)	0.0260 (5)	0.0018 (5)	0.0042 (5)	−0.0015 (4)
C15	0.0272 (11)	0.0240 (8)	0.0283 (9)	0.0007 (8)	0.0004 (8)	−0.0044 (7)
C16	0.0239 (10)	0.0173 (8)	0.0260 (9)	−0.0003 (7)	−0.0001 (7)	0.0028 (6)
C17	0.0282 (12)	0.0220 (9)	0.0281 (10)	−0.0006 (7)	0.0025 (8)	0.0037 (7)
C18	0.0339 (12)	0.0258 (9)	0.0341 (10)	0.0020 (8)	0.0087 (9)	0.0066 (7)
C19	0.0259 (11)	0.0284 (9)	0.0492 (12)	0.0014 (8)	0.0031 (10)	0.0107 (9)
C20	0.0327 (13)	0.0254 (9)	0.0409 (11)	−0.0002 (8)	−0.0079 (9)	0.0048 (8)
C21	0.0279 (11)	0.0194 (8)	0.0297 (9)	0.0011 (8)	−0.0022 (8)	0.0021 (7)

3-Benzyl-2-[(E)-2-(thiophen-2-yl)ethenyl]-2,3-dihydroquinazolin-4(1H)-one (II) . Geometric parameters (Å, º)

S1—C14	1.721 (2)	C9—H9	0.9500
S1—C11	1.727 (2)	C10—C11	1.475 (3)
O1—C4	1.251 (2)	C10—H10	0.9500
N1—C8A	1.396 (3)	C11—C12	1.437 (3)
N1—C2	1.467 (2)	C12—C13	1.440 (3)
N1—H1	0.87 (3)	C12—H12	0.9500
C2—N3	1.489 (2)	C13—C14	1.371 (3)
C2—C9	1.511 (3)	C13—H13	0.9500
C2—H2	1.0000	C14—H14	0.9500
N3—C4	1.371 (2)	C15—C16	1.533 (3)
N3—C15	1.465 (2)	C15—H15A	0.9900
C4—C4A	1.486 (3)	C15—H15B	0.9900
C4A—C5	1.409 (3)	C16—C21	1.402 (3)
C4A—C8A	1.414 (2)	C16—C17	1.406 (3)
C5—C6	1.397 (3)	C17—C18	1.405 (3)
C5—H5	0.9500	C17—H17	0.9500
C6—C7	1.406 (3)	C18—C19	1.401 (3)
C6—H6	0.9500	C18—H18	0.9500
C7—C8	1.385 (3)	C19—C20	1.399 (3)
C7—H7	0.9500	C19—H19	0.9500
C8—C8A	1.418 (3)	C20—C21	1.395 (3)
C8—H8	0.9500	C20—H20	0.9500
C9—C10	1.343 (3)	C21—H21	0.9500
C14—S1—C11	92.28 (10)	C9—C10—H10	116.8
C8A—N1—C2	117.34 (15)	C11—C10—H10	116.8
C8A—N1—H1	116.5 (16)	C12—C11—C10	125.22 (19)
C2—N1—H1	113.1 (15)	C12—C11—S1	111.83 (15)
N1—C2—N3	108.92 (14)	C10—C11—S1	122.94 (14)
N1—C2—C9	113.41 (16)	C11—C12—C13	109.51 (19)
N3—C2—C9	111.47 (15)	C11—C12—H12	125.2
N1—C2—H2	107.6	C13—C12—H12	125.2
N3—C2—H2	107.6	C14—C13—C12	114.26 (18)
C9—C2—H2	107.6	C14—C13—H13	122.9
C4—N3—C15	120.68 (15)	C12—C13—H13	122.9
C4—N3—C2	122.63 (15)	C13—C14—S1	112.11 (17)
C15—N3—C2	115.99 (15)	C13—C14—H14	123.9
O1—C4—N3	121.87 (17)	S1—C14—H14	123.9
O1—C4—C4A	122.35 (17)	N3—C15—C16	113.52 (15)
N3—C4—C4A	115.74 (15)	N3—C15—H15A	108.9
C5—C4A—C8A	120.09 (17)	C16—C15—H15A	108.9
C5—C4A—C4	119.86 (16)	N3—C15—H15B	108.9
C8A—C4A—C4	119.83 (17)	C16—C15—H15B	108.9
C6—C5—C4A	120.97 (18)	H15A—C15—H15B	107.7
C6—C5—H5	119.5	C21—C16—C17	119.12 (18)
C4A—C5—H5	119.5	C21—C16—C15	118.25 (17)
C5—C6—C7	118.5 (2)	C17—C16—C15	122.63 (17)
C5—C6—H6	120.8	C18—C17—C16	120.24 (19)
C7—C6—H6	120.8	C18—C17—H17	119.9
C8—C7—C6	121.66 (19)	C16—C17—H17	119.9
C8—C7—H7	119.2	C19—C18—C17	119.90 (19)
C6—C7—H7	119.2	C19—C18—H18	120.0
C7—C8—C8A	120.21 (18)	C17—C18—H18	120.0
C7—C8—H8	119.9	C20—C19—C18	119.9 (2)
C8A—C8—H8	119.9	C20—C19—H19	120.0
N1—C8A—C4A	119.13 (17)	C18—C19—H19	120.0
N1—C8A—C8	122.14 (16)	C21—C20—C19	120.0 (2)
C4A—C8A—C8	118.60 (17)	C21—C20—H20	120.0
C10—C9—C2	123.27 (19)	C19—C20—H20	120.0
C10—C9—H9	118.4	C20—C21—C16	120.79 (19)
C2—C9—H9	118.4	C20—C21—H21	119.6
C9—C10—C11	126.45 (19)	C16—C21—H21	119.6
C8A—N1—C2—N3	−46.4 (2)	C7—C8—C8A—C4A	−0.6 (3)
C8A—N1—C2—C9	78.4 (2)	N1—C2—C9—C10	120.5 (2)
N1—C2—N3—C4	37.7 (2)	N3—C2—C9—C10	−116.17 (19)
C9—C2—N3—C4	−88.2 (2)	C2—C9—C10—C11	−178.56 (17)
N1—C2—N3—C15	−151.91 (16)	C9—C10—C11—C12	−177.92 (18)
C9—C2—N3—C15	82.2 (2)	C9—C10—C11—S1	2.0 (3)
C15—N3—C4—O1	2.2 (3)	C14—S1—C11—C12	0.19 (15)
C2—N3—C4—O1	172.24 (17)	C14—S1—C11—C10	−179.70 (16)
C15—N3—C4—C4A	−179.85 (16)	C10—C11—C12—C13	179.56 (17)
C2—N3—C4—C4A	−9.9 (3)	S1—C11—C12—C13	−0.3 (2)
O1—C4—C4A—C5	−8.7 (3)	C11—C12—C13—C14	0.4 (2)
N3—C4—C4A—C5	173.42 (17)	C12—C13—C14—S1	−0.2 (2)
O1—C4—C4A—C8A	165.94 (18)	C11—S1—C14—C13	0.02 (16)
N3—C4—C4A—C8A	−11.9 (3)	C4—N3—C15—C16	−112.23 (18)
C8A—C4A—C5—C6	−0.6 (3)	C2—N3—C15—C16	77.1 (2)
C4—C4A—C5—C6	174.00 (18)	N3—C15—C16—C21	−168.65 (15)
C4A—C5—C6—C7	−0.3 (3)	N3—C15—C16—C17	12.1 (2)
C5—C6—C7—C8	0.7 (3)	C21—C16—C17—C18	0.5 (3)
C6—C7—C8—C8A	−0.3 (3)	C15—C16—C17—C18	179.79 (16)
C2—N1—C8A—C4A	28.7 (2)	C16—C17—C18—C19	−1.6 (3)
C2—N1—C8A—C8	−155.42 (18)	C17—C18—C19—C20	1.0 (3)
C5—C4A—C8A—N1	177.06 (17)	C18—C19—C20—C21	0.8 (3)
C4—C4A—C8A—N1	2.4 (3)	C19—C20—C21—C16	−1.9 (3)
C5—C4A—C8A—C8	1.1 (3)	C17—C16—C21—C20	1.2 (3)
C4—C4A—C8A—C8	−173.56 (17)	C15—C16—C21—C20	−178.09 (17)
C7—C8—C8A—N1	−176.50 (18)

3-Benzyl-2-[(E)-2-(thiophen-2-yl)ethenyl]-2,3-dihydroquinazolin-4(1H)-one (II) . Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
N1—H1···O1i	0.87 (3)	2.14 (3)	2.978 (2)	161 (2)

Symmetry code: (i) −x+1/2, y−1/2, z.

Funding Statement

This work was funded by Ministry of Education and Science of the Russian Federation grant 4.1154.2017/4.6. Russian Foundation for Basic Research grant 16–03-00125.