Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807020193/sj2300sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S1600536807020193/sj2300Isup2.hkl |
CCDC reference: 648224
Air-dried heartwood of T. populnea (2.1 kg) was extracted with CH2Cl2 over a period of 5 d at room temperature. The CH2Cl2 extract was evaporated under reduced pressure to yield a orange-brown gum (37.5 g), which was subjected to silica gel column chromatography using CH2Cl2 as eluent to afford 8 fractions (F1—F8). Fraction F7 was subjected to repeated column chromatography with acetone-CH2Cl2 as eluents for gradient elution to afford the title compound (I). Purple needle-shaped single crystals of (I) were obtained by recrystallization from MeOH-CH2Cl2 (3:7 v/v) after several days (m.p. 532–534 K).
In the absence of significant anomalous scattering effects, 2730 Friedel pairs were averaged. All H atoms were positioned geometrically and allowed to ride on their parent atoms, with an O—H distance of 0.82 Å and C—H distances in the range 0.93–0.96 Å. The Uiso values were constrained to be 1.5Ueq of the carrier atom for methyl H atoms and 1.2Ueq for the remaining H atoms. A rotating group model was used for the methyl groups.
The heartwood of Thespesia populnea is a rich source of highly oxidized sesquiterpenes containing a cadinane skeleton (Milbrodt et al., 1997). Some possess significant pharmacological effects such as cytotoxicity (Tiew et al., 2002; Duh et al., 2004; Wang et al., 2004) and antifungal activity (Silva et al., 2006). Previously we reported the stucture of mansonone E, a sesquiterpene isolated from T. populnea (Fun et al., 2007). In continuation of our study of bioactive compounds from T. populnea, (Po-ta-lea in Thai) a plant in the malvaceae, we report the structure of the title compound, (I) isolated from the heartwood of T. populnea collected from the Suratthani province in Thailand. Biological activity tests show that (I) is inactive against bacteria and shows an IC50 > 5 µg/ml) against MCF-7 (breast), Hela (cervical), HT-29 (colon) and KB (oral cavity) cancer cell lines.
Compound (I) crystallizes with two conformationally similar independent molecules (A and B) per asymmetric unit (Fig. 1). The bond lengths and angles in (I) are normal (Allen et al., 1987) and comparable to those in a related structure (Fun et al., 2007). In both molecules, the cyclohexadiene rings (C1—C6) are essentially planar with maximum deviations of -0.037 (3) for C1A and 0.036 (3) Å for atom C4B. The dihydropyran rings adopt envelope conformations, with atom C12 displaced from the C1/C2/C10/C11/O1 plane by -0.340 (3)Å and -0.315 (3) Å for A and B, respectively. The puckering parameters (Cremer & Pople, 1975) are Q = 0.473 (3) Å, θ = 122.7 (3)° and φ = 121.6 (3)° for A and Q = 0.439 (2) Å, θ = 124.0 (3)° and φ = 119.3 (4)° for B. Both the cycloxene rings adopt screw boat conformations with puckering parameters Q = 0.434 (3) Å, θ = 57.4 (4)° and φ = 150.4 (4)° for A and Q = 0.416 (2) Å, θ = 54.1 (4)° and φ = 154.9 (4)° for B. In both molecules, the methyl group at C3 lies in the cyclohexadiene ring plane whereas the C7 and C11 methyl groups are axial to the cyclohexene and dihydropyran rings (Fig. 1).
In the crystal intramolecular O3A—H3AA···O2A and O3B—H3BA···O2B hydrogen bonds generate S(5) ring motifs with S(10) motifs formed by O3A—H3AA···O2B and O3B—H3BA···O2A interactions (Bernstein et al., 1995). These link the two molecules into dimers which form chains along a through weak intermolecular C—H···O interactions (Fig. 2, Table 1). The crystal is further stabilized by C—H···π interactions; Cg1 is the centroid of C1B–C6B (Table 1).
For details of the sources and biological activities of related sesquiterpenes, see Tiew et al. (2002); Duh et al. (2004); Wang et al. (2004); Silva et al. (2006). For related literature on hydrogen-bond motifs, see Bernstein et al. (1995), and on values of bond lengths and angles, see Allen et al. (1987). For a related structure, see Fun et al., (2007). For related literature, see: Cremer & Pople (1975); Milbrodt et al. (1997).
Data collection: APEX2 (Bruker, 2005); cell refinement: APEX2; data reduction: SAINT (Bruker, 2005); program(s) used to solve structure: SHELXTL (Sheldrick, 1998); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2003).
C15H16O4 | Dx = 1.321 Mg m−3 |
Mr = 260.28 | Melting point = 532–534 K |
Orthorhombic, P212121 | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: P 2ac 2ab | Cell parameters from 3593 reflections |
a = 8.5390 (4) Å | θ = 1.3–28.0° |
b = 10.0913 (5) Å | µ = 0.10 mm−1 |
c = 30.3769 (14) Å | T = 100 K |
V = 2617.6 (2) Å3 | Needle, purple |
Z = 8 | 0.51 × 0.19 × 0.11 mm |
F(000) = 1104 |
Bruker SMART APEX2 CCD area-detector diffractometer | 3593 independent reflections |
Radiation source: fine-focus sealed tube | 3004 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.067 |
Detector resolution: 8.33 pixels mm-1 | θmax = 28.0°, θmin = 1.3° |
ω scans | h = −11→11 |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | k = −12→13 |
Tmin = 0.953, Tmax = 0.990 | l = −39→40 |
28942 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)] = 0.045 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.113 | H-atom parameters constrained |
S = 1.03 | w = 1/[σ2(Fo2) + (0.0619P)2 + 0.359P] where P = (Fo2 + 2Fc2)/3 |
3593 reflections | (Δ/σ)max < 0.001 |
349 parameters | Δρmax = 0.30 e Å−3 |
0 restraints | Δρmin = −0.22 e Å−3 |
C15H16O4 | V = 2617.6 (2) Å3 |
Mr = 260.28 | Z = 8 |
Orthorhombic, P212121 | Mo Kα radiation |
a = 8.5390 (4) Å | µ = 0.10 mm−1 |
b = 10.0913 (5) Å | T = 100 K |
c = 30.3769 (14) Å | 0.51 × 0.19 × 0.11 mm |
Bruker SMART APEX2 CCD area-detector diffractometer | 3593 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | 3004 reflections with I > 2σ(I) |
Tmin = 0.953, Tmax = 0.990 | Rint = 0.067 |
28942 measured reflections |
R[F2 > 2σ(F2)] = 0.045 | 0 restraints |
wR(F2) = 0.113 | H-atom parameters constrained |
S = 1.03 | Δρmax = 0.30 e Å−3 |
3593 reflections | Δρmin = −0.22 e Å−3 |
349 parameters |
Experimental. The data was collected with the Oxford Cyrosystem Cobra low-temperature attachment. |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
O1A | 0.7493 (2) | 0.62788 (16) | 0.10729 (5) | 0.0247 (4) | |
O2A | 0.8398 (2) | 0.77230 (17) | 0.25156 (6) | 0.0279 (4) | |
O3A | 0.7968 (2) | 0.52747 (17) | 0.28561 (5) | 0.0277 (4) | |
H3AA | 0.7890 | 0.5996 | 0.2979 | 0.042* | |
O4A | 0.7326 (3) | 0.13687 (19) | 0.12509 (6) | 0.0436 (6) | |
C1A | 0.7573 (3) | 0.4667 (2) | 0.16700 (7) | 0.0194 (5) | |
C2A | 0.7636 (3) | 0.6047 (2) | 0.15122 (7) | 0.0198 (5) | |
C3A | 0.7918 (3) | 0.7077 (2) | 0.17842 (8) | 0.0214 (5) | |
C4A | 0.8115 (3) | 0.6818 (2) | 0.22519 (8) | 0.0212 (5) | |
C5A | 0.7907 (3) | 0.5448 (2) | 0.24131 (7) | 0.0217 (5) | |
C6A | 0.7665 (3) | 0.4418 (2) | 0.21395 (7) | 0.0201 (5) | |
C7A | 0.7381 (3) | 0.3024 (2) | 0.23054 (8) | 0.0244 (5) | |
H7AA | 0.7908 | 0.2922 | 0.2590 | 0.029* | |
C8A | 0.8087 (3) | 0.2023 (3) | 0.19815 (8) | 0.0296 (6) | |
H8AA | 0.9220 | 0.2079 | 0.1995 | 0.035* | |
H8AB | 0.7787 | 0.1135 | 0.2070 | 0.035* | |
C9A | 0.7560 (3) | 0.2260 (3) | 0.15131 (8) | 0.0286 (6) | |
C10A | 0.7422 (3) | 0.3664 (2) | 0.13727 (8) | 0.0207 (5) | |
C11A | 0.7211 (3) | 0.3933 (2) | 0.08885 (8) | 0.0228 (5) | |
H11A | 0.6446 | 0.3301 | 0.0771 | 0.027* | |
C12A | 0.6554 (3) | 0.5315 (3) | 0.08381 (8) | 0.0262 (5) | |
H12A | 0.6522 | 0.5547 | 0.0528 | 0.031* | |
H12B | 0.5490 | 0.5335 | 0.0950 | 0.031* | |
C13A | 0.8749 (3) | 0.3761 (3) | 0.06367 (8) | 0.0304 (6) | |
H13A | 0.9186 | 0.2906 | 0.0701 | 0.046* | |
H13B | 0.9473 | 0.4439 | 0.0725 | 0.046* | |
H13C | 0.8553 | 0.3830 | 0.0326 | 0.046* | |
C14A | 0.7978 (3) | 0.8499 (2) | 0.16384 (8) | 0.0265 (5) | |
H14A | 0.7826 | 0.8545 | 0.1326 | 0.040* | |
H14B | 0.8979 | 0.8870 | 0.1712 | 0.040* | |
H14C | 0.7166 | 0.8991 | 0.1784 | 0.040* | |
C15A | 0.5626 (3) | 0.2783 (3) | 0.23716 (9) | 0.0338 (6) | |
H15A | 0.5210 | 0.3443 | 0.2567 | 0.051* | |
H15B | 0.5468 | 0.1919 | 0.2497 | 0.051* | |
H15C | 0.5100 | 0.2835 | 0.2093 | 0.051* | |
O1B | 0.7010 (2) | 0.87759 (16) | 0.49008 (5) | 0.0273 (4) | |
O2B | 0.7770 (3) | 0.73126 (18) | 0.34594 (6) | 0.0386 (5) | |
O3B | 0.8073 (2) | 0.97874 (18) | 0.31392 (5) | 0.0291 (4) | |
H3BA | 0.8132 | 0.9062 | 0.3019 | 0.044* | |
O4B | 0.7987 (2) | 1.36536 (17) | 0.47624 (6) | 0.0274 (4) | |
C1B | 0.7519 (3) | 1.0400 (2) | 0.43210 (7) | 0.0189 (5) | |
C2B | 0.7216 (3) | 0.9027 (2) | 0.44669 (8) | 0.0218 (5) | |
C3B | 0.7241 (3) | 0.7987 (2) | 0.41856 (8) | 0.0254 (5) | |
C4B | 0.7622 (3) | 0.8228 (2) | 0.37285 (8) | 0.0258 (6) | |
C5B | 0.7823 (3) | 0.9617 (2) | 0.35765 (7) | 0.0226 (5) | |
C6B | 0.7778 (3) | 1.0649 (2) | 0.38527 (8) | 0.0194 (5) | |
C7B | 0.7933 (3) | 1.2061 (2) | 0.36968 (8) | 0.0217 (5) | |
H7BA | 0.8575 | 1.2062 | 0.3429 | 0.026* | |
C8B | 0.8782 (3) | 1.2897 (2) | 0.40482 (7) | 0.0237 (5) | |
H8BA | 0.9876 | 1.2640 | 0.4057 | 0.028* | |
H8BB | 0.8733 | 1.3824 | 0.3965 | 0.028* | |
C9B | 0.8086 (3) | 1.2736 (2) | 0.44997 (8) | 0.0219 (5) | |
C10B | 0.7607 (3) | 1.1374 (2) | 0.46290 (8) | 0.0200 (5) | |
C11B | 0.7364 (3) | 1.1094 (2) | 0.51100 (8) | 0.0219 (5) | |
H11B | 0.6778 | 1.1837 | 0.5237 | 0.026* | |
C12B | 0.6393 (3) | 0.9857 (2) | 0.51640 (8) | 0.0260 (5) | |
H12C | 0.6384 | 0.9598 | 0.5472 | 0.031* | |
H12D | 0.5323 | 1.0038 | 0.5076 | 0.031* | |
C13B | 0.8948 (3) | 1.1007 (3) | 0.53461 (8) | 0.0304 (6) | |
H13D | 0.9493 | 1.1834 | 0.5316 | 0.046* | |
H13E | 0.9562 | 1.0311 | 0.5217 | 0.046* | |
H13F | 0.8780 | 1.0821 | 0.5652 | 0.046* | |
C14B | 0.6971 (5) | 0.6582 (3) | 0.43310 (9) | 0.0420 (8) | |
H14D | 0.6267 | 0.6574 | 0.4577 | 0.063* | |
H14E | 0.7950 | 0.6190 | 0.4415 | 0.063* | |
H14F | 0.6522 | 0.6085 | 0.4093 | 0.063* | |
C15B | 0.6336 (3) | 1.2662 (3) | 0.35835 (8) | 0.0275 (6) | |
H15E | 0.5832 | 1.2127 | 0.3364 | 0.041* | |
H15F | 0.6479 | 1.3544 | 0.3472 | 0.041* | |
H15G | 0.5697 | 1.2691 | 0.3843 | 0.041* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1A | 0.0370 (9) | 0.0204 (8) | 0.0166 (8) | −0.0034 (7) | −0.0031 (7) | −0.0001 (7) |
O2A | 0.0407 (10) | 0.0216 (9) | 0.0213 (9) | −0.0030 (8) | 0.0021 (8) | −0.0051 (8) |
O3A | 0.0459 (10) | 0.0225 (9) | 0.0149 (8) | −0.0034 (8) | 0.0008 (8) | −0.0041 (7) |
O4A | 0.0871 (17) | 0.0196 (9) | 0.0242 (10) | −0.0047 (11) | −0.0080 (10) | −0.0051 (8) |
C1A | 0.0231 (11) | 0.0168 (11) | 0.0181 (11) | −0.0006 (9) | 0.0002 (9) | 0.0006 (10) |
C2A | 0.0243 (11) | 0.0196 (12) | 0.0155 (11) | −0.0007 (9) | 0.0016 (9) | 0.0005 (9) |
C3A | 0.0256 (11) | 0.0185 (12) | 0.0202 (11) | 0.0008 (9) | 0.0028 (10) | −0.0009 (10) |
C4A | 0.0243 (11) | 0.0190 (12) | 0.0202 (12) | −0.0009 (9) | 0.0026 (10) | −0.0043 (10) |
C5A | 0.0261 (11) | 0.0240 (13) | 0.0149 (11) | −0.0023 (10) | −0.0001 (9) | −0.0004 (10) |
C6A | 0.0249 (11) | 0.0193 (12) | 0.0161 (11) | −0.0001 (9) | 0.0004 (9) | 0.0002 (9) |
C7A | 0.0370 (13) | 0.0195 (12) | 0.0168 (11) | −0.0015 (10) | −0.0030 (10) | 0.0011 (10) |
C8A | 0.0482 (15) | 0.0182 (12) | 0.0224 (13) | 0.0002 (11) | −0.0051 (12) | 0.0003 (11) |
C9A | 0.0430 (14) | 0.0206 (13) | 0.0221 (12) | −0.0006 (11) | −0.0015 (11) | −0.0017 (11) |
C10A | 0.0256 (11) | 0.0187 (12) | 0.0177 (11) | −0.0019 (10) | −0.0007 (9) | 0.0003 (10) |
C11A | 0.0298 (12) | 0.0216 (12) | 0.0169 (11) | −0.0048 (10) | −0.0011 (9) | −0.0057 (10) |
C12A | 0.0316 (12) | 0.0283 (13) | 0.0187 (12) | −0.0018 (11) | −0.0053 (10) | −0.0009 (11) |
C13A | 0.0345 (14) | 0.0336 (15) | 0.0230 (13) | −0.0043 (12) | 0.0038 (10) | −0.0080 (12) |
C14A | 0.0380 (13) | 0.0191 (12) | 0.0225 (12) | −0.0003 (10) | 0.0037 (11) | −0.0004 (11) |
C15A | 0.0403 (14) | 0.0339 (16) | 0.0272 (14) | −0.0122 (12) | 0.0014 (11) | 0.0032 (13) |
O1B | 0.0467 (10) | 0.0195 (9) | 0.0158 (8) | 0.0016 (8) | 0.0045 (8) | 0.0000 (7) |
O2B | 0.0733 (14) | 0.0223 (10) | 0.0201 (9) | −0.0025 (10) | 0.0051 (10) | −0.0060 (8) |
O3B | 0.0487 (11) | 0.0227 (9) | 0.0158 (8) | −0.0002 (9) | 0.0033 (8) | −0.0037 (7) |
O4B | 0.0365 (9) | 0.0221 (9) | 0.0234 (9) | −0.0015 (8) | −0.0008 (8) | −0.0042 (8) |
C1B | 0.0210 (10) | 0.0197 (11) | 0.0160 (11) | −0.0007 (9) | 0.0009 (8) | 0.0000 (10) |
C2B | 0.0282 (12) | 0.0201 (12) | 0.0171 (11) | 0.0023 (10) | 0.0028 (9) | 0.0020 (9) |
C3B | 0.0376 (13) | 0.0188 (12) | 0.0199 (12) | 0.0016 (11) | 0.0019 (11) | 0.0002 (10) |
C4B | 0.0390 (14) | 0.0212 (13) | 0.0172 (12) | −0.0009 (10) | −0.0006 (10) | −0.0024 (10) |
C5B | 0.0305 (12) | 0.0231 (12) | 0.0143 (11) | −0.0003 (10) | −0.0003 (9) | 0.0015 (10) |
C6B | 0.0246 (11) | 0.0175 (11) | 0.0160 (11) | 0.0014 (9) | 0.0002 (9) | 0.0014 (9) |
C7B | 0.0300 (12) | 0.0185 (12) | 0.0167 (11) | −0.0016 (10) | 0.0038 (10) | 0.0011 (10) |
C8B | 0.0296 (12) | 0.0212 (12) | 0.0203 (12) | −0.0028 (10) | 0.0028 (10) | −0.0001 (10) |
C9B | 0.0245 (11) | 0.0209 (12) | 0.0204 (11) | −0.0001 (10) | −0.0010 (9) | −0.0005 (10) |
C10B | 0.0224 (11) | 0.0198 (11) | 0.0179 (11) | 0.0028 (9) | −0.0011 (9) | 0.0008 (10) |
C11B | 0.0285 (12) | 0.0221 (12) | 0.0149 (11) | 0.0048 (10) | −0.0012 (9) | −0.0032 (10) |
C12B | 0.0373 (13) | 0.0248 (13) | 0.0159 (11) | 0.0015 (11) | 0.0045 (10) | −0.0011 (10) |
C13B | 0.0361 (14) | 0.0360 (16) | 0.0190 (12) | 0.0061 (12) | −0.0038 (10) | −0.0023 (12) |
C14B | 0.081 (2) | 0.0204 (14) | 0.0248 (14) | −0.0058 (15) | 0.0088 (15) | 0.0020 (12) |
C15B | 0.0340 (13) | 0.0257 (14) | 0.0229 (13) | 0.0004 (11) | −0.0028 (10) | 0.0045 (11) |
O1A—C2A | 1.360 (3) | O1B—C2B | 1.353 (3) |
O1A—C12A | 1.448 (3) | O1B—C12B | 1.451 (3) |
O2A—C4A | 1.239 (3) | O2B—C4B | 1.240 (3) |
O3A—C5A | 1.358 (3) | O3B—C5B | 1.356 (3) |
O3A—H3AA | 0.8200 | O3B—H3BA | 0.8200 |
O4A—C9A | 1.218 (3) | O4B—C9B | 1.225 (3) |
C1A—C10A | 1.363 (3) | C1B—C10B | 1.359 (3) |
C1A—C6A | 1.450 (3) | C1B—C6B | 1.461 (3) |
C1A—C2A | 1.474 (3) | C1B—C2B | 1.478 (3) |
C2A—C3A | 1.349 (3) | C2B—C3B | 1.353 (3) |
C3A—C4A | 1.454 (3) | C3B—C4B | 1.447 (3) |
C3A—C14A | 1.503 (3) | C3B—C14B | 1.503 (4) |
C4A—C5A | 1.477 (3) | C4B—C5B | 1.485 (3) |
C5A—C6A | 1.347 (3) | C5B—C6B | 1.338 (3) |
C6A—C7A | 1.514 (3) | C6B—C7B | 1.508 (3) |
C7A—C15A | 1.532 (4) | C7B—C15B | 1.531 (3) |
C7A—C8A | 1.533 (4) | C7B—C8B | 1.541 (3) |
C7A—H7AA | 0.9800 | C7B—H7BA | 0.9800 |
C8A—C9A | 1.512 (3) | C8B—C9B | 1.503 (3) |
C8A—H8AA | 0.9700 | C8B—H8BA | 0.9700 |
C8A—H8AB | 0.9700 | C8B—H8BB | 0.9700 |
C9A—C10A | 1.485 (3) | C9B—C10B | 1.487 (3) |
C10A—C11A | 1.506 (3) | C10B—C11B | 1.503 (3) |
C11A—C12A | 1.511 (3) | C11B—C12B | 1.508 (3) |
C11A—C13A | 1.530 (3) | C11B—C13B | 1.533 (3) |
C11A—H11A | 0.9800 | C11B—H11B | 0.9800 |
C12A—H12A | 0.9700 | C12B—H12C | 0.9700 |
C12A—H12B | 0.9700 | C12B—H12D | 0.9700 |
C13A—H13A | 0.9600 | C13B—H13D | 0.9600 |
C13A—H13B | 0.9600 | C13B—H13E | 0.9600 |
C13A—H13C | 0.9600 | C13B—H13F | 0.9600 |
C14A—H14A | 0.9600 | C14B—H14D | 0.9600 |
C14A—H14B | 0.9600 | C14B—H14E | 0.9600 |
C14A—H14C | 0.9600 | C14B—H14F | 0.9600 |
C15A—H15A | 0.9600 | C15B—H15E | 0.9600 |
C15A—H15B | 0.9600 | C15B—H15F | 0.9600 |
C15A—H15C | 0.9600 | C15B—H15G | 0.9600 |
C2A—O1A—C12A | 114.68 (18) | C2B—O1B—C12B | 116.32 (18) |
C5A—O3A—H3AA | 109.5 | C5B—O3B—H3BA | 109.5 |
C10A—C1A—C6A | 121.9 (2) | C10B—C1B—C6B | 122.5 (2) |
C10A—C1A—C2A | 119.3 (2) | C10B—C1B—C2B | 118.8 (2) |
C6A—C1A—C2A | 118.8 (2) | C6B—C1B—C2B | 118.7 (2) |
C3A—C2A—O1A | 119.0 (2) | C3B—C2B—O1B | 118.2 (2) |
C3A—C2A—C1A | 122.3 (2) | C3B—C2B—C1B | 122.3 (2) |
O1A—C2A—C1A | 118.56 (19) | O1B—C2B—C1B | 119.3 (2) |
C2A—C3A—C4A | 118.7 (2) | C2B—C3B—C4B | 118.7 (2) |
C2A—C3A—C14A | 124.1 (2) | C2B—C3B—C14B | 122.9 (2) |
C4A—C3A—C14A | 117.1 (2) | C4B—C3B—C14B | 118.4 (2) |
O2A—C4A—C3A | 121.4 (2) | O2B—C4B—C3B | 122.0 (2) |
O2A—C4A—C5A | 119.9 (2) | O2B—C4B—C5B | 119.1 (2) |
C3A—C4A—C5A | 118.6 (2) | C3B—C4B—C5B | 118.9 (2) |
C6A—C5A—O3A | 121.2 (2) | C6B—C5B—O3B | 121.3 (2) |
C6A—C5A—C4A | 122.4 (2) | C6B—C5B—C4B | 122.4 (2) |
O3A—C5A—C4A | 116.4 (2) | O3B—C5B—C4B | 116.3 (2) |
C5A—C6A—C1A | 118.8 (2) | C5B—C6B—C1B | 118.7 (2) |
C5A—C6A—C7A | 122.4 (2) | C5B—C6B—C7B | 122.4 (2) |
C1A—C6A—C7A | 118.7 (2) | C1B—C6B—C7B | 118.8 (2) |
C6A—C7A—C15A | 110.3 (2) | C6B—C7B—C15B | 111.5 (2) |
C6A—C7A—C8A | 109.6 (2) | C6B—C7B—C8B | 109.93 (19) |
C15A—C7A—C8A | 111.4 (2) | C15B—C7B—C8B | 111.0 (2) |
C6A—C7A—H7AA | 108.5 | C6B—C7B—H7BA | 108.1 |
C15A—C7A—H7AA | 108.5 | C15B—C7B—H7BA | 108.1 |
C8A—C7A—H7AA | 108.5 | C8B—C7B—H7BA | 108.1 |
C9A—C8A—C7A | 112.5 (2) | C9B—C8B—C7B | 112.8 (2) |
C9A—C8A—H8AA | 109.1 | C9B—C8B—H8BA | 109.0 |
C7A—C8A—H8AA | 109.1 | C7B—C8B—H8BA | 109.0 |
C9A—C8A—H8AB | 109.1 | C9B—C8B—H8BB | 109.0 |
C7A—C8A—H8AB | 109.1 | C7B—C8B—H8BB | 109.0 |
H8AA—C8A—H8AB | 107.8 | H8BA—C8B—H8BB | 107.8 |
O4A—C9A—C10A | 120.3 (2) | O4B—C9B—C10B | 120.5 (2) |
O4A—C9A—C8A | 123.2 (2) | O4B—C9B—C8B | 122.7 (2) |
C10A—C9A—C8A | 116.4 (2) | C10B—C9B—C8B | 116.7 (2) |
C1A—C10A—C9A | 120.7 (2) | C1B—C10B—C9B | 120.1 (2) |
C1A—C10A—C11A | 121.6 (2) | C1B—C10B—C11B | 121.7 (2) |
C9A—C10A—C11A | 117.5 (2) | C9B—C10B—C11B | 117.9 (2) |
C10A—C11A—C12A | 108.0 (2) | C10B—C11B—C12B | 109.7 (2) |
C10A—C11A—C13A | 111.4 (2) | C10B—C11B—C13B | 110.1 (2) |
C12A—C11A—C13A | 111.9 (2) | C12B—C11B—C13B | 112.7 (2) |
C10A—C11A—H11A | 108.5 | C10B—C11B—H11B | 108.1 |
C12A—C11A—H11A | 108.5 | C12B—C11B—H11B | 108.1 |
C13A—C11A—H11A | 108.5 | C13B—C11B—H11B | 108.1 |
O1A—C12A—C11A | 111.35 (19) | O1B—C12B—C11B | 111.3 (2) |
O1A—C12A—H12A | 109.4 | O1B—C12B—H12C | 109.4 |
C11A—C12A—H12A | 109.4 | C11B—C12B—H12C | 109.4 |
O1A—C12A—H12B | 109.4 | O1B—C12B—H12D | 109.4 |
C11A—C12A—H12B | 109.4 | C11B—C12B—H12D | 109.4 |
H12A—C12A—H12B | 108.0 | H12C—C12B—H12D | 108.0 |
C11A—C13A—H13A | 109.5 | C11B—C13B—H13D | 109.5 |
C11A—C13A—H13B | 109.5 | C11B—C13B—H13E | 109.5 |
H13A—C13A—H13B | 109.5 | H13D—C13B—H13E | 109.5 |
C11A—C13A—H13C | 109.5 | C11B—C13B—H13F | 109.5 |
H13A—C13A—H13C | 109.5 | H13D—C13B—H13F | 109.5 |
H13B—C13A—H13C | 109.5 | H13E—C13B—H13F | 109.5 |
C3A—C14A—H14A | 109.5 | C3B—C14B—H14D | 109.5 |
C3A—C14A—H14B | 109.5 | C3B—C14B—H14E | 109.5 |
H14A—C14A—H14B | 109.5 | H14D—C14B—H14E | 109.5 |
C3A—C14A—H14C | 109.5 | C3B—C14B—H14F | 109.5 |
H14A—C14A—H14C | 109.5 | H14D—C14B—H14F | 109.5 |
H14B—C14A—H14C | 109.5 | H14E—C14B—H14F | 109.5 |
C7A—C15A—H15A | 109.5 | C7B—C15B—H15E | 109.5 |
C7A—C15A—H15B | 109.5 | C7B—C15B—H15F | 109.5 |
H15A—C15A—H15B | 109.5 | H15E—C15B—H15F | 109.5 |
C7A—C15A—H15C | 109.5 | C7B—C15B—H15G | 109.5 |
H15A—C15A—H15C | 109.5 | H15E—C15B—H15G | 109.5 |
H15B—C15A—H15C | 109.5 | H15F—C15B—H15G | 109.5 |
C12A—O1A—C2A—C3A | −154.1 (2) | C12B—O1B—C2B—C3B | −156.9 (2) |
C12A—O1A—C2A—C1A | 29.6 (3) | C12B—O1B—C2B—C1B | 27.5 (3) |
C10A—C1A—C2A—C3A | −174.2 (2) | C10B—C1B—C2B—C3B | −174.4 (2) |
C6A—C1A—C2A—C3A | 6.2 (3) | C6B—C1B—C2B—C3B | 3.1 (4) |
C10A—C1A—C2A—O1A | 2.0 (3) | C10B—C1B—C2B—O1B | 1.0 (3) |
C6A—C1A—C2A—O1A | −177.67 (19) | C6B—C1B—C2B—O1B | 178.5 (2) |
O1A—C2A—C3A—C4A | −178.3 (2) | O1B—C2B—C3B—C4B | −173.7 (2) |
C1A—C2A—C3A—C4A | −2.1 (4) | C1B—C2B—C3B—C4B | 1.8 (4) |
O1A—C2A—C3A—C14A | 4.5 (4) | O1B—C2B—C3B—C14B | 3.2 (4) |
C1A—C2A—C3A—C14A | −179.4 (2) | C1B—C2B—C3B—C14B | 178.6 (3) |
C2A—C3A—C4A—O2A | 179.0 (2) | C2B—C3B—C4B—O2B | 175.0 (3) |
C14A—C3A—C4A—O2A | −3.6 (4) | C14B—C3B—C4B—O2B | −1.9 (4) |
C2A—C3A—C4A—C5A | −3.5 (3) | C2B—C3B—C4B—C5B | −5.7 (4) |
C14A—C3A—C4A—C5A | 174.0 (2) | C14B—C3B—C4B—C5B | 177.3 (3) |
O2A—C4A—C5A—C6A | −177.1 (2) | O2B—C4B—C5B—C6B | −175.7 (3) |
C3A—C4A—C5A—C6A | 5.4 (4) | C3B—C4B—C5B—C6B | 5.0 (4) |
O2A—C4A—C5A—O3A | 3.1 (3) | O2B—C4B—C5B—O3B | 3.6 (4) |
C3A—C4A—C5A—O3A | −174.5 (2) | C3B—C4B—C5B—O3B | −175.6 (2) |
O3A—C5A—C6A—C1A | 178.5 (2) | O3B—C5B—C6B—C1B | −179.4 (2) |
C4A—C5A—C6A—C1A | −1.3 (4) | C4B—C5B—C6B—C1B | −0.1 (4) |
O3A—C5A—C6A—C7A | 2.6 (4) | O3B—C5B—C6B—C7B | 2.6 (4) |
C4A—C5A—C6A—C7A | −177.3 (2) | C4B—C5B—C6B—C7B | −178.1 (2) |
C10A—C1A—C6A—C5A | 176.1 (2) | C10B—C1B—C6B—C5B | 173.5 (2) |
C2A—C1A—C6A—C5A | −4.3 (3) | C2B—C1B—C6B—C5B | −3.9 (3) |
C10A—C1A—C6A—C7A | −7.8 (3) | C10B—C1B—C6B—C7B | −8.5 (3) |
C2A—C1A—C6A—C7A | 171.9 (2) | C2B—C1B—C6B—C7B | 174.2 (2) |
C5A—C6A—C7A—C15A | 90.4 (3) | C5B—C6B—C7B—C15B | 89.7 (3) |
C1A—C6A—C7A—C15A | −85.6 (3) | C1B—C6B—C7B—C15B | −88.3 (3) |
C5A—C6A—C7A—C8A | −146.6 (2) | C5B—C6B—C7B—C8B | −146.8 (2) |
C1A—C6A—C7A—C8A | 37.4 (3) | C1B—C6B—C7B—C8B | 35.2 (3) |
C6A—C7A—C8A—C9A | −51.6 (3) | C6B—C7B—C8B—C9B | −50.2 (3) |
C15A—C7A—C8A—C9A | 70.8 (3) | C15B—C7B—C8B—C9B | 73.6 (3) |
C7A—C8A—C9A—O4A | −144.8 (3) | C7B—C8B—C9B—O4B | −143.4 (2) |
C7A—C8A—C9A—C10A | 38.7 (3) | C7B—C8B—C9B—C10B | 40.5 (3) |
C6A—C1A—C10A—C9A | −8.3 (4) | C6B—C1B—C10B—C9B | −4.2 (3) |
C2A—C1A—C10A—C9A | 172.1 (2) | C2B—C1B—C10B—C9B | 173.1 (2) |
C6A—C1A—C10A—C11A | 175.6 (2) | C6B—C1B—C10B—C11B | −178.9 (2) |
C2A—C1A—C10A—C11A | −4.1 (4) | C2B—C1B—C10B—C11B | −1.6 (3) |
O4A—C9A—C10A—C1A | 175.4 (3) | O4B—C9B—C10B—C1B | 171.1 (2) |
C8A—C9A—C10A—C1A | −8.0 (4) | C8B—C9B—C10B—C1B | −12.7 (3) |
O4A—C9A—C10A—C11A | −8.3 (4) | O4B—C9B—C10B—C11B | −14.0 (3) |
C8A—C9A—C10A—C11A | 168.3 (2) | C8B—C9B—C10B—C11B | 162.2 (2) |
C1A—C10A—C11A—C12A | −22.9 (3) | C1B—C10B—C11B—C12B | −23.9 (3) |
C9A—C10A—C11A—C12A | 160.8 (2) | C9B—C10B—C11B—C12B | 161.3 (2) |
C1A—C10A—C11A—C13A | 100.4 (3) | C1B—C10B—C11B—C13B | 100.7 (3) |
C9A—C10A—C11A—C13A | −75.9 (3) | C9B—C10B—C11B—C13B | −74.1 (3) |
C2A—O1A—C12A—C11A | −58.4 (3) | C2B—O1B—C12B—C11B | −53.8 (3) |
C10A—C11A—C12A—O1A | 52.5 (3) | C10B—C11B—C12B—O1B | 49.7 (3) |
C13A—C11A—C12A—O1A | −70.5 (3) | C13B—C11B—C12B—O1B | −73.4 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
O3A—H3AA···O2A | 0.82 | 2.28 | 2.703 (2) | 112 |
O3A—H3AA···O2B | 0.82 | 1.98 | 2.760 (2) | 159 |
O3B—H3BA···O2A | 0.82 | 2.05 | 2.829 (2) | 158 |
O3B—H3BA···O2B | 0.82 | 2.24 | 2.693 (3) | 115 |
C7A—H7AA···O3A | 0.98 | 2.51 | 2.865 (3) | 101 |
C7B—H7BA···O3B | 0.98 | 2.50 | 2.854 (3) | 101 |
C12A—H12A···O4Bi | 0.97 | 2.50 | 3.452 (3) | 168 |
C12B—H12D···O4Bii | 0.97 | 2.44 | 3.281 (3) | 145 |
C14A—H14A···O1A | 0.96 | 2.43 | 2.853 (3) | 106 |
C12A—H12B···Cg1iii | 0.97 | 2.78 | 3.657 (3) | 151 |
C13A—H13B···Cg1iv | 0.97 | 2.67 | 3.387 (3) | 132 |
Symmetry codes: (i) −x+3/2, −y+2, z−1/2; (ii) x−1/2, −y+5/2, −z+1; (iii) x+3/2, −y−1/2, −z; (iv) x+5/2, −y−1/2, −z. |
Experimental details
Crystal data | |
Chemical formula | C15H16O4 |
Mr | 260.28 |
Crystal system, space group | Orthorhombic, P212121 |
Temperature (K) | 100 |
a, b, c (Å) | 8.5390 (4), 10.0913 (5), 30.3769 (14) |
V (Å3) | 2617.6 (2) |
Z | 8 |
Radiation type | Mo Kα |
µ (mm−1) | 0.10 |
Crystal size (mm) | 0.51 × 0.19 × 0.11 |
Data collection | |
Diffractometer | Bruker SMART APEX2 CCD area-detector |
Absorption correction | Multi-scan (SADABS; Bruker, 2005) |
Tmin, Tmax | 0.953, 0.990 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 28942, 3593, 3004 |
Rint | 0.067 |
(sin θ/λ)max (Å−1) | 0.661 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.045, 0.113, 1.03 |
No. of reflections | 3593 |
No. of parameters | 349 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.30, −0.22 |
Computer programs: APEX2 (Bruker, 2005), APEX2, SAINT (Bruker, 2005), SHELXTL (Sheldrick, 1998), SHELXTL and PLATON (Spek, 2003).
D—H···A | D—H | H···A | D···A | D—H···A |
O3A—H3AA···O2A | 0.82 | 2.2819 | 2.703 (2) | 112 |
O3A—H3AA···O2B | 0.82 | 1.9762 | 2.760 (2) | 159 |
O3B—H3BA···O2A | 0.82 | 2.0532 | 2.829 (2) | 158 |
O3B—H3BA···O2B | 0.82 | 2.2365 | 2.693 (3) | 115 |
C7A—H7AA···O3A | 0.98 | 2.5085 | 2.865 (3) | 101 |
C7B—H7BA···O3B | 0.98 | 2.4955 | 2.854 (3) | 101 |
C12A—H12A···O4Bi | 0.97 | 2.4970 | 3.452 (3) | 168 |
C12B—H12D···O4Bii | 0.97 | 2.4420 | 3.281 (3) | 145 |
C14A—H14A···O1A | 0.96 | 2.4294 | 2.853 (3) | 106 |
C12A—H12B···Cg1iii | 0.97 | 2.7793 | 3.657 (3) | 151 |
C13A—H13B···Cg1iv | 0.97 | 2.6723 | 3.387 (3) | 132 |
Symmetry codes: (i) −x+3/2, −y+2, z−1/2; (ii) x−1/2, −y+5/2, −z+1; (iii) x+3/2, −y−1/2, −z; (iv) x+5/2, −y−1/2, −z. |
The heartwood of Thespesia populnea is a rich source of highly oxidized sesquiterpenes containing a cadinane skeleton (Milbrodt et al., 1997). Some possess significant pharmacological effects such as cytotoxicity (Tiew et al., 2002; Duh et al., 2004; Wang et al., 2004) and antifungal activity (Silva et al., 2006). Previously we reported the stucture of mansonone E, a sesquiterpene isolated from T. populnea (Fun et al., 2007). In continuation of our study of bioactive compounds from T. populnea, (Po-ta-lea in Thai) a plant in the malvaceae, we report the structure of the title compound, (I) isolated from the heartwood of T. populnea collected from the Suratthani province in Thailand. Biological activity tests show that (I) is inactive against bacteria and shows an IC50 > 5 µg/ml) against MCF-7 (breast), Hela (cervical), HT-29 (colon) and KB (oral cavity) cancer cell lines.
Compound (I) crystallizes with two conformationally similar independent molecules (A and B) per asymmetric unit (Fig. 1). The bond lengths and angles in (I) are normal (Allen et al., 1987) and comparable to those in a related structure (Fun et al., 2007). In both molecules, the cyclohexadiene rings (C1—C6) are essentially planar with maximum deviations of -0.037 (3) for C1A and 0.036 (3) Å for atom C4B. The dihydropyran rings adopt envelope conformations, with atom C12 displaced from the C1/C2/C10/C11/O1 plane by -0.340 (3)Å and -0.315 (3) Å for A and B, respectively. The puckering parameters (Cremer & Pople, 1975) are Q = 0.473 (3) Å, θ = 122.7 (3)° and φ = 121.6 (3)° for A and Q = 0.439 (2) Å, θ = 124.0 (3)° and φ = 119.3 (4)° for B. Both the cycloxene rings adopt screw boat conformations with puckering parameters Q = 0.434 (3) Å, θ = 57.4 (4)° and φ = 150.4 (4)° for A and Q = 0.416 (2) Å, θ = 54.1 (4)° and φ = 154.9 (4)° for B. In both molecules, the methyl group at C3 lies in the cyclohexadiene ring plane whereas the C7 and C11 methyl groups are axial to the cyclohexene and dihydropyran rings (Fig. 1).
In the crystal intramolecular O3A—H3AA···O2A and O3B—H3BA···O2B hydrogen bonds generate S(5) ring motifs with S(10) motifs formed by O3A—H3AA···O2B and O3B—H3BA···O2A interactions (Bernstein et al., 1995). These link the two molecules into dimers which form chains along a through weak intermolecular C—H···O interactions (Fig. 2, Table 1). The crystal is further stabilized by C—H···π interactions; Cg1 is the centroid of C1B–C6B (Table 1).