Crystal structure of a photobiologically active furan­ocoumarin from Artemisia reticulata

Bauri, A.K.; Foro, S.; Nguyen Do, N.Q.

doi:10.1107/S2056989016003303

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Volume 72| Part 4| April 2016| Pages 463-466

https://doi.org/10.1107/S2056989016003303

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Crystal structure of a photobiologically active furanocoumarin from Artemisia reticulata

A. K. Bauri,^a Sabine Foro ^b and Nhu Quynh Nguyen Do ^c ^*

^aBioorganic Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India, ^bClemens Schöpf-Institut für Organische Chemie und Biochemie, Technische Universität Darmstadt, Petersenstrasse 22, D-64287 Darmstadt, Germany, and ^cAccident & Emergency Department, Franco, Vietnamese Hospital, 7-Nguyen, Luong Bang Street, HoChiMinh City, Vietnam
^*Correspondence e-mail: nguyendonhuquynh@yahoo.com

Edited by H. Stoeckli-Evans, University of Neuchâtel, Switzerland (Received 9 February 2016; accepted 26 February 2016; online 4 March 2016)

The title furanocoumarin, C₁₄H₁₂O₄ [systematic name: 9-hydroxy-2-(prop-1-en-2-yl)-2,3-dihydro-7H-furo[3,2-g]chromen-7-one], crystallizes with two independent molecules (A and B) in the asymmetric unit. The two molecules differ essentially in the orientation of the propenyl group with respect to the mean plane of the furanocoumarin moiety; the O—C(H)—C=C torsion angle is 122.2 (7)° in molecule A and −10.8 (11)° in molecule B. In the crystal, the A and B molecules are linked via O—H⋯O hydrogen bonds, forming zigzag –A–B–A–B– chains propagating along [001]. The chains are reinforced by bifurcated C—H⋯(O,O) hydrogen bonds, forming ribbons which are linked via C—H⋯π and π–π interactions [intercentroid distance = 3.602 (2) Å], forming a three-dimensional structure.

Keywords: crystal structure; furanocoumarin; oroselone; Artemisia reticulata; photobiological property; hydrogen bonding.

CCDC reference: 1422810

1. Chemical context

The title furanocoumarin was isolated from the Indian herb A. reticulata, by column chromatography over silica gel with a mixture of binary solvent hexane and ethyl acetate by gradient elution. Furanocoumarins, such as oroselone [systematic name: 8-(prop-1-en-2-yl)-2H-furo[2,3-h]chromen-2-one], whose atomic connectivity has been established by spectrometric and spectroscopic analyses (Schroeder et al., 1959 ; Dorofeenko et al., 1973 ) but not yet by single crystal X-ray diffraction, exhibit photobiological activity. For example such compounds are employed as photoprotective agents to prevent absorption of harmful UV radiation (Chen et al., 2007 , 2009 ). Anti-oxidant and anti-inflammatory activities have also been reported for furano as well as pyrano coumarins and their derivatives (Appendino et al., 2004 ; Scott et al., 1976 ).

2. Structural commentary

The title compound, Fig. 1, crystallizes with two independent molecules (A and B) in the asymmetric unit. The compound is composed of three fused rings (furan, benzene and pyrone) with hydroxyl and propenyl substituents at positions 9 and 2, respectively. The furanocoumarin moieties are essentially planar with r.m.s. deviations of 0.05 Å for molecule A (O1/O2/C1–C11) and 0.079 Å for molecule B (O5/O6/C16–C25). The furan ring in molecule A has an envelope conformation with atom C2 as the flap, deviating by 0.120 (4) Å from the mean plane of the furanocoumarin moiety. In molecule B, the furan ring has a twisted conformation on bond C17–C16 with atoms C16 and C17 deviating by −0.232 (6) and 0.076 (6) Å, respectively, from the other atoms of the twisted five-membered ring. The two molecules differ essentially in the orientation of the propenyl group with respect to the mean plane of the furanocoumarin moiety, as shown by AutoMolFit analysis (Spek, 2009 ); see Fig. 2. The O1—C2—C12=C14 torsion angle is 122.2 (7)° in molecule A, while the O5—C16—C26=C28 torsion angle is −10.8 (11) ° in molecule B. The bond distances and bond angles in the propenyl side chains (C2,C12–C14 in molecule A and C16,C26–C28 in molecule B) also differ in the two molecules (Table 1), probably due to libration and bond rotation. Overall the bond distances and bond angles in the furanocoumarin moieties are in good agreement with the corresponding values reported for related structures (Stemple & Watson, 1972 ; Gupta et al., 1993 ; Singh et al. 1995 ; Magotra et al., 1995 ; Thailambal et al., 1986 ; Thailambal & Pattabhi, 1987 , 1985 ).

Table 1
Selected geometric parameters (Å, °)

C2—C12	1.500 (8)	C16—C26	1.489 (8)
C12—C14	1.313 (10)	C26—C28	1.363 (13)
C12—C13	1.461 (10)	C26—C27	1.422 (10)

C14—C12—C13	122.7 (7)	C28—C26—C27	123.5 (7)
C14—C12—C2	118.9 (7)	C28—C26—C16	121.9 (6)
C13—C12—C2	118.4 (5)	C27—C26—C16	114.7 (6)

Figure 1
The molecular structure of the two independent molecules (A and B) of the title compound, showing the atom labelling. Displacement ellipsoids are drawn at the 50% probability level.

Figure 2
The molecular fit (Spek, 2009

) of molecules A (black) and B (red) of the title compound.

The absolute structure of the molecule in the crystal could not be determined by resonant scattering. In order to determine the chirality at atom C2 (in molecule A; C16 in molecule B), the circular dichroism (CD) spectrum was measured in a solution of chloroform at concentration of 1 mg/ml using a cell with path length 1 cm. This CD measurement revealed that the absolute configuration of atom C2 (in molecule A; C16 in molecule B) is S.

3. Supramolecular features

In the crystal, the A and B molecules are linked via O—H⋯O hydrogen bonds, forming zigzag –A–B–A–B– chains propagating along the c-axis direction; see Table 2 and Fig. 3. The chains are reinforced by bifurcated C—H⋯(O,O) hydrogen bonds, forming ribbons (Table 2 and Fig. 3). The ribbons are arranged in a herringbone fashion, and are linked via C—H⋯π and slipped parallel π–π interactions, forming a three-dimensional network; see Fig. 4 and Table 2 [Cg2⋯Cg9ⁱ = 3.602 (2) Å, interplanar distance = 3.4168 (2) Å, slippage 1.284 Å, where Cg2 and Cg9 are the centroids of rings C1/C4–C8 and C15/C18–C22, respectively; symmetry code: (i) − x + 1, y + $[{1\over 2}]$ , − z].

Table 2
Hydrogen-bond geometry (Å, °)

Cg2 and Cg9 are the centroids of rings O2/C6/C7/C9–C11 and C15–C22, respectively.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O3—H3O⋯O8ⁱ	0.83	1.85	2.676 (5)	174
O7—H7O⋯O4ⁱⁱ	0.84	1.85	2.671 (5)	168
C10—H10⋯O3ⁱⁱⁱ	0.93	2.53	3.199 (5)	129
C10—H10⋯O8^iv	0.93	2.50	3.415 (6)	166
C24—H24⋯O7^v	0.93	2.58	3.229 (5)	128
C24—H24⋯O4^vi	0.93	2.53	3.434 (5)	164
C3—H3B⋯Cg2^vii	0.97	2.95	3.871 (5)	160
C13—H13B⋯Cg9	0.96	2.92	3.680 (9)	137
Symmetry codes: (i) $[-x+2, y+{\script{1\over 2}}, -z+1]$ ; (ii) $[-x+2, y-{\script{1\over 2}}, -z]$ ; (iii) x, y, z-1; (iv) $[-x+2, y+{\script{1\over 2}}, -z]$ ; (v) x, y, z+1; (vi) $[-x+2, y-{\script{1\over 2}}, -z+1]$ ; (vii) x-1, y, z.

Figure 3
A view along the a axis of the crystal packing of the title compound (A molecules are blue; B molecules are red). The hydrogen bonds are shown as dashed lines (see Table 2

), and C-bound H atoms not involved in hydrogen bonding have been omitted for clarity.

Figure 4
A view along the c axis of the crystal packing of the title compound. Hydrogen bonds and C—H⋯π interactions are shown as dashed lines (see Table 2

), and C-bound H atoms not involved in hydrogen bonding have been omitted for clarity.

4. Database survey

A search of the Cambridge Structural Database (Version 5.37, update November 2015; Groom & Allen, 2014 ) gave 21 hits for the furanocoumarin substructure, but only one hit for a 9-hydroxy furanocoumarin, viz. 2,3-dihydro-9-hydroxy-2-(1-hydroxy-1-methylethyl)-7H-furo(3,2-g)(1) benzopyran-7-one monohydrate (refcode FUGVOS; Thailambal & Pattabhi, 1987).

5. Synthesis and crystallization

The title compound was isolated as a colourless solid from the methanol extract of A. reticulata by means of column chromatography over silica gel by gradient elution with a mixture of binary solvents system hexane and ethyl acetate. It was purified by reverse-phase high-pressure liquid chromatography. Colourless rod-like crystals suitable for X ray diffraction analysis were obtained after the title compound was recrystallized three times from ethyl acetate:hexane (1:4) at room temperature by slow evaporation of the solvents (m.p. 498 K). ¹H NMR data (CHCl₃, 200 MHz) 7.60 (d, 1H, J = 9.6 Hz, H-9), 6.85 (s, 1H, H-5), 6.20 (d, 1H, J = 9.6 Hz, H-10), 5.35 (dd, 1H, J = 8.8 and 8.8 Hz, H-7), 5.11 (s, 1H, H_a-14), 4.94 (s, 1H, H_b-14), 3.47–3.34 (dd, 1H, J = 9.0 and 1.2 Hz, H_a-3),3.16–3.04 (dd, 1H, J = 9.0 and 1.2 Hz, H_b-3), 1.78 (s, 3H, –CH₃). EIMS (70 ev) data: m/z (%) 244(15.9) [M⁺], 226 (68.6) [M⁺ − H₂O), 198 (100) [base peak], 185 (30),171 (16.8), 155 (30.1), 140 (16.4), 127 (13.5), 115 (25.10,85 (11.1), 75 (22.3), 63 (26.5), 41 (16.0).

6. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 3. The hydroxyl H atoms were located in a difference Fourier map and refined as riding with U_iso(H) = 1.2U_eq(O). The C-bound H atoms were included in calculated positions and treated as riding atoms: C—H = 0.93–0.98 Å with U_iso(H) = 1.2U_eq(C). The limited number of Friedel pairs measured were merged for refinement.

Table 3
Experimental details

Crystal data
Chemical formula	C₁₄H₁₂O₄
M_r	244.24
Crystal system, space group	Monoclinic, P2₁
Temperature (K)	299
a, b, c (Å)	7.2738 (9), 21.426 (2), 8.0152 (9)
β (°)	100.88 (1)
V (Å³)	1226.7 (2)
Z	4
Radiation type	Cu Kα
μ (mm⁻¹)	0.81
Crystal size (mm)	0.50 × 0.18 × 0.15

Data collection
Diffractometer	Enraf–Nonius CAD-4
Absorption correction	ψ scan (North et al., 1968 )
T_min, T_max	0.688, 0.888
No. of measured, independent and observed [I > 2σ(I)] reflections	2692, 2133, 1808
R_int	0.111
(sin θ/λ)_max (Å⁻¹)	0.597

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.057, 0.148, 1.08
No. of reflections	2133
No. of parameters	328
No. of restraints	1
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.28, −0.34
Computer programs: CAD-4-PC (Enraf–Nonius, 1996 ), REDU4 (Stoe & Cie, 1987 ), SHELXS97 and SHELXL97 (Sheldrick, 2008 ), PLATON (Spek, 2009) and Mercury (Macrae et al., 2008 ).

Supporting information

CCDC reference: 1422810

Crystal structure: contains datablocks I, global. DOI: https://doi.org/10.1107/S2056989016003303/su5279sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989016003303/su5279Isup2.hkl

Supporting information file. DOI: https://doi.org/10.1107/S2056989016003303/su5279Isup3.cml

checkCIF report

Computing details top

Data collection: CAD-4-PC (Enraf–Nonius, 1996); cell refinement: CAD-4-PC (Enraf–Nonius, 1996); data reduction: REDU4 (Stoe & Cie, 1987); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009) and Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009).

9-Hydroxy-2-(prop-1-en-2-yl)-2,3-dihydro-7H-furo[3,2-g]chromen-7-one top

Crystal data top

C₁₄H₁₂O₄	F(000) = 512
M_r = 244.24	D_x = 1.322 Mg m⁻³
Monoclinic, P2₁	Melting point: 498 K
Hall symbol: P 2y1	Cu Kα radiation, λ = 1.54180 Å
a = 7.2738 (9) Å	Cell parameters from 25 reflections
b = 21.426 (2) Å	θ = 6.0–19.8°
c = 8.0152 (9) Å	µ = 0.81 mm⁻¹
β = 100.88 (1)°	T = 299 K
V = 1226.7 (2) Å³	Rod, colourless
Z = 4	0.50 × 0.18 × 0.15 mm

Data collection top

Enraf–Nonius CAD-4 diffractometer	1808 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	R_int = 0.111
Graphite monochromator	θ_max = 66.9°, θ_min = 4.1°
ω/2θ scans	h = −8→8
Absorption correction: ψ scan (North et al., 1968)	k = −25→0
T_min = 0.688, T_max = 0.888	l = −9→2
2692 measured reflections	3 standard reflections every 120 min
2133 independent reflections	intensity decay: 1.0%

Refinement top

Refinement on F²	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F² > 2σ(F²)] = 0.057	H-atom parameters constrained
wR(F²) = 0.148	w = 1/[σ²(F_o²) + (0.0983P)² + 0.0698P] where P = (F_o² + 2F_c²)/3
S = 1.08	(Δ/σ)_max = 0.045
2133 reflections	Δρ_max = 0.28 e Å⁻³
328 parameters	Δρ_min = −0.34 e Å⁻³
1 restraint	Extinction correction: SHELXL97 (Sheldrick, 2008), Fc^*=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4
Primary atom site location: structure-invariant direct methods	Extinction coefficient: 0.0058 (13)

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
O1	0.5538 (5)	0.26546 (17)	0.2707 (4)	0.0718 (9)
O2	1.0199 (4)	0.35147 (14)	0.0003 (3)	0.0584 (7)
O3	0.8972 (4)	0.32756 (18)	0.2942 (3)	0.0716 (9)
H3O	0.9962	0.3467	0.3283	0.086*
O4	1.2459 (5)	0.3904 (2)	−0.1133 (4)	0.0760 (9)
C1	0.6289 (6)	0.2805 (2)	0.1313 (5)	0.0593 (10)
C2	0.3653 (7)	0.2416 (2)	0.2102 (6)	0.0677 (11)
H2	0.2748	0.2741	0.2241	0.081*
C3	0.3504 (7)	0.2283 (2)	0.0208 (6)	0.0717 (12)
H3A	0.3550	0.1838	−0.0007	0.086*
H3B	0.2354	0.2452	−0.0447	0.086*
C4	0.5186 (6)	0.2609 (2)	−0.0213 (5)	0.0615 (10)
C5	0.5778 (7)	0.2722 (2)	−0.1707 (5)	0.0646 (11)
H5	0.5045	0.2598	−0.2732	0.078*
C6	0.7474 (6)	0.30226 (19)	−0.1693 (5)	0.0574 (10)
C7	0.8535 (6)	0.32065 (19)	−0.0126 (4)	0.0510 (9)
C8	0.7961 (6)	0.3100 (2)	0.1404 (5)	0.0559 (10)
C9	0.8303 (7)	0.3148 (2)	−0.3149 (5)	0.0643 (11)
H9	0.7672	0.3025	−0.4217	0.077*
C10	0.9934 (7)	0.3435 (2)	−0.3019 (5)	0.0650 (11)
H10	1.0412	0.3510	−0.3997	0.078*
C11	1.0988 (7)	0.3634 (2)	−0.1407 (5)	0.0608 (10)
C12	0.3366 (8)	0.1867 (3)	0.3189 (7)	0.0784 (14)
C13	0.4654 (13)	0.1340 (4)	0.3277 (12)	0.120 (2)
H13A	0.4677	0.1193	0.2150	0.144*
H13B	0.4243	0.1010	0.3929	0.144*
H13C	0.5888	0.1471	0.3810	0.144*
C14	0.1973 (13)	0.1879 (5)	0.4018 (13)	0.131 (3)
H14A	0.1775	0.1543	0.4697	0.157*
H14B	0.1184	0.2224	0.3928	0.157*
O5	0.0856 (5)	0.01320 (19)	−0.0052 (4)	0.0800 (10)
O6	0.5536 (4)	−0.07278 (16)	0.4256 (3)	0.0632 (8)
O7	0.4356 (5)	−0.04541 (19)	0.0908 (3)	0.0761 (10)
H7O	0.5264	−0.0689	0.0873	0.091*
O8	0.7736 (5)	−0.1141 (3)	0.6163 (4)	0.0985 (14)
C15	0.1590 (6)	−0.0022 (2)	0.1597 (5)	0.0605 (10)
C16	−0.1072 (8)	0.0320 (3)	−0.0122 (7)	0.0768 (13)
H16	−0.1887	−0.0035	−0.0522	0.092*
C17	−0.1231 (8)	0.0464 (3)	0.1738 (7)	0.0804 (14)
H17A	−0.1172	0.0909	0.1960	0.097*
H17B	−0.2382	0.0298	0.2005	0.097*
C18	0.0452 (6)	0.0134 (2)	0.2722 (6)	0.0648 (11)
C19	0.1022 (6)	0.0007 (2)	0.4429 (6)	0.0646 (11)
H19	0.0271	0.0117	0.5200	0.077*
C20	0.2723 (6)	−0.0287 (2)	0.4982 (5)	0.0555 (9)
C21	0.3829 (6)	−0.04370 (19)	0.3800 (5)	0.0536 (9)
C22	0.3273 (6)	−0.0310 (2)	0.2071 (5)	0.0564 (10)
C23	0.3455 (6)	−0.0475 (2)	0.6713 (5)	0.0617 (10)
H23	0.2751	−0.0397	0.7547	0.074*
C24	0.5094 (7)	−0.0754 (2)	0.7141 (5)	0.0670 (12)
H24	0.5520	−0.0865	0.8270	0.080*
C25	0.6234 (7)	−0.0890 (2)	0.5911 (5)	0.0658 (11)
C26	−0.1586 (9)	0.0850 (3)	−0.1320 (8)	0.0882 (16)
C27	−0.3538 (11)	0.0976 (4)	−0.1745 (13)	0.132 (3)
H27A	−0.4064	0.0762	−0.2778	0.159*
H27B	−0.3732	0.1417	−0.1900	0.159*
H27C	−0.4136	0.0834	−0.0845	0.159*
C28	−0.0275 (15)	0.1170 (6)	−0.1987 (19)	0.181 (5)
H28A	−0.0641	0.1490	−0.2764	0.217*
H28B	0.0986	0.1069	−0.1666	0.217*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
O1	0.0756 (18)	0.094 (2)	0.0482 (16)	−0.0229 (17)	0.0165 (13)	−0.0004 (15)
O2	0.0673 (16)	0.0776 (19)	0.0310 (12)	−0.0106 (14)	0.0109 (11)	−0.0007 (12)
O3	0.0767 (18)	0.107 (2)	0.0293 (13)	−0.0232 (17)	0.0062 (12)	−0.0107 (14)
O4	0.079 (2)	0.104 (2)	0.0474 (16)	−0.0193 (19)	0.0178 (14)	−0.0041 (16)
C1	0.074 (2)	0.066 (2)	0.0362 (19)	−0.007 (2)	0.0076 (17)	−0.0017 (18)
C2	0.072 (3)	0.073 (3)	0.059 (3)	−0.017 (2)	0.014 (2)	−0.003 (2)
C3	0.077 (3)	0.074 (3)	0.059 (2)	−0.016 (2)	0.000 (2)	0.001 (2)
C4	0.070 (2)	0.058 (2)	0.052 (2)	−0.0097 (19)	−0.0007 (18)	−0.0027 (17)
C5	0.087 (3)	0.066 (3)	0.0349 (19)	−0.006 (2)	−0.0039 (18)	−0.0053 (18)
C6	0.075 (3)	0.059 (2)	0.0347 (19)	−0.0034 (19)	0.0009 (16)	−0.0010 (16)
C7	0.067 (2)	0.057 (2)	0.0281 (17)	−0.0028 (18)	0.0071 (14)	−0.0035 (14)
C8	0.065 (2)	0.067 (2)	0.0328 (17)	−0.0066 (19)	0.0005 (16)	−0.0047 (17)
C9	0.092 (3)	0.069 (3)	0.0301 (17)	−0.002 (2)	0.0067 (17)	0.0000 (18)
C10	0.087 (3)	0.074 (3)	0.0349 (19)	−0.007 (2)	0.0131 (19)	0.0024 (18)
C11	0.075 (3)	0.073 (3)	0.0370 (19)	0.001 (2)	0.0156 (18)	−0.0007 (17)
C12	0.089 (3)	0.081 (3)	0.067 (3)	−0.022 (3)	0.021 (3)	−0.003 (2)
C13	0.146 (6)	0.094 (5)	0.120 (6)	0.009 (5)	0.023 (5)	0.028 (4)
C14	0.140 (6)	0.125 (6)	0.144 (8)	−0.029 (5)	0.066 (6)	0.018 (5)
O5	0.087 (2)	0.104 (3)	0.0412 (15)	0.024 (2)	−0.0062 (14)	0.0061 (15)
O6	0.0667 (16)	0.092 (2)	0.0293 (13)	0.0173 (15)	0.0059 (11)	0.0098 (13)
O7	0.085 (2)	0.111 (3)	0.0339 (14)	0.0274 (19)	0.0166 (13)	0.0096 (15)
O8	0.091 (2)	0.156 (4)	0.0462 (18)	0.048 (3)	0.0075 (16)	0.026 (2)
C15	0.069 (2)	0.069 (2)	0.039 (2)	0.004 (2)	−0.0011 (17)	0.0035 (18)
C16	0.080 (3)	0.079 (3)	0.063 (3)	0.008 (3)	−0.009 (2)	0.001 (2)
C17	0.073 (3)	0.092 (3)	0.074 (3)	0.019 (3)	0.006 (2)	−0.003 (3)
C18	0.065 (2)	0.069 (3)	0.057 (3)	0.006 (2)	0.0030 (19)	−0.003 (2)
C19	0.069 (2)	0.074 (3)	0.052 (2)	0.005 (2)	0.0156 (19)	−0.006 (2)
C20	0.066 (2)	0.063 (2)	0.0377 (19)	−0.0015 (19)	0.0103 (16)	−0.0041 (16)
C21	0.065 (2)	0.062 (2)	0.0330 (18)	0.0021 (18)	0.0053 (15)	0.0023 (15)
C22	0.067 (2)	0.067 (2)	0.0334 (18)	0.0069 (19)	0.0049 (16)	0.0051 (16)
C23	0.081 (3)	0.075 (3)	0.0317 (18)	0.000 (2)	0.0183 (17)	−0.0042 (17)
C24	0.082 (3)	0.085 (3)	0.0320 (19)	0.002 (2)	0.0072 (18)	0.0045 (19)
C25	0.076 (3)	0.088 (3)	0.0319 (18)	0.012 (2)	0.0070 (18)	0.0117 (18)
C26	0.096 (4)	0.068 (3)	0.087 (3)	0.010 (3)	−0.016 (3)	0.000 (3)
C27	0.111 (5)	0.114 (6)	0.152 (7)	0.017 (4)	−0.025 (5)	0.034 (5)
C28	0.136 (7)	0.150 (8)	0.241 (13)	−0.008 (7)	−0.003 (8)	0.106 (9)

Geometric parameters (Å, º) top

O1—C1	1.371 (5)	O5—C15	1.369 (5)
O1—C2	1.459 (5)	O5—C16	1.449 (6)
O2—C7	1.366 (5)	O6—C25	1.373 (5)
O2—C11	1.384 (5)	O6—C21	1.375 (5)
O3—C8	1.363 (5)	O7—C22	1.365 (5)
O3—H3O	0.8294	O7—H7O	0.8354
O4—C11	1.199 (5)	O8—C25	1.200 (6)
C1—C8	1.361 (6)	C15—C22	1.360 (6)
C1—C4	1.395 (6)	C15—C18	1.376 (7)
C2—C12	1.500 (8)	C16—C26	1.489 (8)
C2—C3	1.529 (7)	C16—C17	1.549 (8)
C2—H2	0.9800	C16—H16	0.9800
C3—C4	1.501 (7)	C17—C18	1.502 (7)
C3—H3A	0.9700	C17—H17A	0.9700
C3—H3B	0.9700	C17—H17B	0.9700
C4—C5	1.369 (7)	C18—C19	1.379 (6)
C5—C6	1.389 (7)	C19—C20	1.384 (6)
C5—H5	0.9300	C19—H19	0.9300
C6—C7	1.400 (5)	C20—C21	1.391 (6)
C6—C9	1.437 (7)	C20—C23	1.447 (5)
C7—C8	1.387 (6)	C21—C22	1.395 (5)
C9—C10	1.322 (7)	C23—C24	1.320 (7)
C9—H9	0.9300	C23—H23	0.9300
C10—C11	1.437 (6)	C24—C25	1.433 (7)
C10—H10	0.9300	C24—H24	0.9300
C12—C14	1.313 (10)	C26—C28	1.363 (13)
C12—C13	1.461 (10)	C26—C27	1.422 (10)
C13—H13A	0.9600	C27—H27A	0.9600
C13—H13B	0.9600	C27—H27B	0.9600
C13—H13C	0.9600	C27—H27C	0.9600
C14—H14A	0.9300	C28—H28A	0.9300
C14—H14B	0.9300	C28—H28B	0.9300

C1—O1—C2	107.8 (3)	C15—O5—C16	107.6 (4)
C7—O2—C11	121.7 (3)	C25—O6—C21	121.5 (3)
C8—O3—H3O	136.1	C22—O7—H7O	136.1
C8—C1—O1	123.7 (3)	C22—C15—O5	123.1 (4)
C8—C1—C4	123.2 (4)	C22—C15—C18	123.2 (4)
O1—C1—C4	113.1 (4)	O5—C15—C18	113.7 (4)
O1—C2—C12	107.9 (4)	O5—C16—C26	111.1 (5)
O1—C2—C3	106.3 (4)	O5—C16—C17	105.4 (3)
C12—C2—C3	116.1 (4)	C26—C16—C17	114.4 (5)
O1—C2—H2	108.8	O5—C16—H16	108.6
C12—C2—H2	108.8	C26—C16—H16	108.6
C3—C2—H2	108.8	C17—C16—H16	108.6
C4—C3—C2	103.2 (3)	C18—C17—C16	102.1 (4)
C4—C3—H3A	111.1	C18—C17—H17A	111.3
C2—C3—H3A	111.1	C16—C17—H17A	111.3
C4—C3—H3B	111.1	C18—C17—H17B	111.3
C2—C3—H3B	111.1	C16—C17—H17B	111.3
H3A—C3—H3B	109.1	H17A—C17—H17B	109.2
C5—C4—C1	119.3 (4)	C15—C18—C19	119.8 (4)
C5—C4—C3	133.1 (4)	C15—C18—C17	107.5 (4)
C1—C4—C3	107.6 (4)	C19—C18—C17	132.6 (4)
C4—C5—C6	120.0 (4)	C18—C19—C20	119.4 (4)
C4—C5—H5	120.0	C18—C19—H19	120.3
C6—C5—H5	120.0	C20—C19—H19	120.3
C5—C6—C7	118.4 (4)	C19—C20—C21	118.9 (4)
C5—C6—C9	126.0 (4)	C19—C20—C23	125.3 (4)
C7—C6—C9	115.5 (4)	C21—C20—C23	115.7 (4)
O2—C7—C8	115.0 (3)	O6—C21—C20	122.2 (3)
O2—C7—C6	122.3 (3)	O6—C21—C22	115.5 (3)
C8—C7—C6	122.7 (4)	C20—C21—C22	122.3 (4)
O3—C8—C1	120.0 (4)	C15—C22—O7	121.1 (3)
O3—C8—C7	123.6 (4)	C15—C22—C21	116.3 (4)
C1—C8—C7	116.4 (3)	O7—C22—C21	122.6 (4)
C10—C9—C6	122.1 (4)	C24—C23—C20	121.7 (4)
C10—C9—H9	119.0	C24—C23—H23	119.1
C6—C9—H9	119.0	C20—C23—H23	119.1
C9—C10—C11	121.8 (4)	C23—C24—C25	121.7 (4)
C9—C10—H10	119.1	C23—C24—H24	119.2
C11—C10—H10	119.1	C25—C24—H24	119.2
O4—C11—O2	115.6 (4)	O8—C25—O6	115.8 (4)
O4—C11—C10	127.9 (4)	O8—C25—C24	127.0 (4)
O2—C11—C10	116.5 (4)	O6—C25—C24	117.2 (4)
C14—C12—C13	122.7 (7)	C28—C26—C27	123.5 (7)
C14—C12—C2	118.9 (7)	C28—C26—C16	121.9 (6)
C13—C12—C2	118.4 (5)	C27—C26—C16	114.7 (6)
C12—C13—H13A	109.5	C26—C27—H27A	109.5
C12—C13—H13B	109.5	C26—C27—H27B	109.5
H13A—C13—H13B	109.5	H27A—C27—H27B	109.5
C12—C13—H13C	109.5	C26—C27—H27C	109.5
H13A—C13—H13C	109.5	H27A—C27—H27C	109.5
H13B—C13—H13C	109.5	H27B—C27—H27C	109.5
C12—C14—H14A	120.0	C26—C28—H28A	120.0
C12—C14—H14B	120.0	C26—C28—H28B	120.0
H14A—C14—H14B	120.0	H28A—C28—H28B	120.0

C2—O1—C1—C8	173.1 (5)	C16—O5—C15—C22	169.4 (5)
C2—O1—C1—C4	−8.5 (6)	C16—O5—C15—C18	−9.7 (6)
C1—O1—C2—C12	139.0 (4)	C15—O5—C16—C26	142.2 (4)
C1—O1—C2—C3	13.8 (5)	C15—O5—C16—C17	17.7 (6)
O1—C2—C3—C4	−13.6 (5)	O5—C16—C17—C18	−18.6 (6)
C12—C2—C3—C4	−133.6 (5)	C26—C16—C17—C18	−141.0 (5)
C8—C1—C4—C5	−0.9 (7)	C22—C15—C18—C19	1.1 (7)
O1—C1—C4—C5	−179.3 (4)	O5—C15—C18—C19	−179.8 (4)
C8—C1—C4—C3	177.8 (5)	C22—C15—C18—C17	177.9 (5)
O1—C1—C4—C3	−0.6 (6)	O5—C15—C18—C17	−3.1 (6)
C2—C3—C4—C5	−172.7 (5)	C16—C17—C18—C15	13.4 (6)
C2—C3—C4—C1	8.8 (5)	C16—C17—C18—C19	−170.5 (5)
C1—C4—C5—C6	0.9 (7)	C15—C18—C19—C20	−1.1 (7)
C3—C4—C5—C6	−177.5 (5)	C17—C18—C19—C20	−176.9 (5)
C4—C5—C6—C7	−0.4 (6)	C18—C19—C20—C21	1.0 (7)
C4—C5—C6—C9	177.3 (4)	C18—C19—C20—C23	−176.9 (4)
C11—O2—C7—C8	177.6 (4)	C25—O6—C21—C20	0.5 (6)
C11—O2—C7—C6	−3.6 (6)	C25—O6—C21—C22	−178.7 (4)
C5—C6—C7—O2	−178.7 (4)	C19—C20—C21—O6	179.9 (4)
C9—C6—C7—O2	3.4 (6)	C23—C20—C21—O6	−2.0 (6)
C5—C6—C7—C8	0.0 (6)	C19—C20—C21—C22	−1.0 (7)
C9—C6—C7—C8	−177.9 (4)	C23—C20—C21—C22	177.2 (4)
O1—C1—C8—O3	−1.3 (7)	O5—C15—C22—O7	1.2 (7)
C4—C1—C8—O3	−179.6 (4)	C18—C15—C22—O7	−179.8 (4)
O1—C1—C8—C7	178.7 (4)	O5—C15—C22—C21	−180.0 (4)
C4—C1—C8—C7	0.5 (7)	C18—C15—C22—C21	−1.0 (7)
O2—C7—C8—O3	−1.2 (6)	O6—C21—C22—C15	−179.9 (4)
C6—C7—C8—O3	−180.0 (4)	C20—C21—C22—C15	0.9 (6)
O2—C7—C8—C1	178.8 (4)	O6—C21—C22—O7	−1.1 (6)
C6—C7—C8—C1	−0.1 (6)	C20—C21—C22—O7	179.7 (4)
C5—C6—C9—C10	−179.6 (5)	C19—C20—C23—C24	180.0 (5)
C7—C6—C9—C10	−1.9 (7)	C21—C20—C23—C24	2.0 (6)
C6—C9—C10—C11	0.5 (7)	C20—C23—C24—C25	−0.5 (8)
C7—O2—C11—O4	−179.5 (4)	C21—O6—C25—O8	−180.0 (5)
C7—O2—C11—C10	2.0 (6)	C21—O6—C25—C24	1.1 (7)
C9—C10—C11—O4	−178.8 (5)	C23—C24—C25—O8	−179.9 (6)
C9—C10—C11—O2	−0.5 (7)	C23—C24—C25—O6	−1.1 (8)
O1—C2—C12—C14	122.2 (7)	O5—C16—C26—C28	−10.8 (11)
C3—C2—C12—C14	−118.7 (7)	C17—C16—C26—C28	108.4 (10)
O1—C2—C12—C13	−57.9 (7)	O5—C16—C26—C27	167.1 (6)
C3—C2—C12—C13	61.3 (7)	C17—C16—C26—C27	−73.7 (8)

Hydrogen-bond geometry (Å, º) top

Cg2 and Cg9 are the centroids of rings O2/C6/C7/C9–C11 and C15–C22, respectively.

D—H···A	D—H	H···A	D···A	D—H···A
O3—H3O···O8ⁱ	0.83	1.85	2.676 (5)	174
O7—H7O···O4ⁱⁱ	0.84	1.85	2.671 (5)	168
C10—H10···O3ⁱⁱⁱ	0.93	2.53	3.199 (5)	129
C10—H10···O8^iv	0.93	2.50	3.415 (6)	166
C24—H24···O7^v	0.93	2.58	3.229 (5)	128
C24—H24···O4^vi	0.93	2.53	3.434 (5)	164
C3—H3B···Cg2^vii	0.97	2.95	3.871 (5)	160
C13—H13B···Cg9	0.96	2.92	3.680 (9)	137

Symmetry codes: (i) −x+2, y+1/2, −z+1; (ii) −x+2, y−1/2, −z; (iii) x, y, z−1; (iv) −x+2, y+1/2, −z; (v) x, y, z+1; (vi) −x+2, y−1/2, −z+1; (vii) x−1, y, z.

Acknowledgements

The authors thank Professor Dr Hartmut Fuess, FG Strukturforschung, FB Material und Geowissenschaften, Technische Universität Darmstadt, Petersenstrasse 23, 64287 Darmstadt, for diffractometer time, and Professor N. Komatsu, Shiga University of Medical Science, Shiga, Otsu, Japan, for recording the CD spectrum.

References

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research communications\(\def\hfill{\hskip 5em}\def\hfil{\hskip 3em}\def\eqno#1{\hfil {#1}}\)

Crystal structure of a photobiologically active furan­ocoumarin from Artemisia reticulata

1. Chemical context

2. Structural commentary

3. Supra­molecular features

4. Database survey

5. Synthesis and crystallization

6. Refinement

Supporting information

Acknowledgements

References

research communications

Crystal structure of a photobiologically active furanocoumarin from Artemisia reticulata

3. Supramolecular features