organic compounds
3,3-Dimethyl-cis-9a,13a-diphenyl-2,3,9a,11,12,13a-hexahydro-1H-benzo[h][1,4]dioxino[2′,3′:5,6][1,4]dioxino[2,3-f]chromene
aDepartamento de Química, Universidade Federal Rural do Rio de Janeiro, 23851-970 Seropédica, RJ, Brazil, bInstituto de Tecnologia em Fármacos–Farmanguinhos, Fundação Oswaldo Cruz, 21041-250 Rio de Janeiro, RJ, Brazil, cDepartment of Chemistry, University of Aberdeen, Old Aberdeen AB24 3UE, Scotland, dCHEMSOL, 1 Harcourt Road, Aberdeen AB15 5NY, Scotland, and eDepartment of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
*Correspondence e-mail: edward.tiekink@gmail.com
In the title dihydrodioxin, C31H28O5, the dioxane ring has a chair conformation, whereas each of the pyran and dioxine rings has an with methylene and quaternary C atoms, respectively, being the flap atoms. The phenyl rings are cis and form a dihedral angle of 82.11 (10)°. The molecular structure is stabilized by C—H⋯O contacts. In the crystal packing, supramolecular layers parallel to (101) are sustained by C—H⋯π interactions.
Related literature
For the biological activity of lapachol and its isomers, see: de Almeida (2009); Ferreira et al. (2010); Medeiros et al. (2010); Neves-Pinto et al. (2002). For reactions of the quinone O atoms in lapachol, see: da Silva et al. (2011); Ferreira et al. (2006); Neves-Pinto et al. (2002). For the preparation of dihydrodioxins, see: Schönberg & Mustafa (1944), and for their DNA photo-cleavage, see: Mack et al. (2004). For the synthesis, see: Summerbell & Berger (1959). For the of β-lapachone, see: Cunha-Filho et al. (2006).
Experimental
Crystal data
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Data collection: COLLECT (Hooft, 1998); cell DENZO (Otwinowski & Minor, 1997) and COLLECT; data reduction: DENZO and COLLECT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and DIAMOND (Brandenburg, 2006); software used to prepare material for publication: publCIF (Westrip, 2010).
Supporting information
10.1107/S1600536813023660/hg5343sup1.cif
contains datablocks general, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536813023660/hg5343Isup2.hkl
β-Lapachone (0.242 g, 1 mmol) was added to a solution of 2,3-diphenyl-1,4-diox-2-ene (0.476 g, 2 mmol) in benzene (20 ml) (Summerbell & Berger, 1959). The solution was deaerated using oxygen-free nitrogen and irradiated using a medium-pressure Hg lamp (500 W; irradiation time = 15 h). The solvent was removed under reduced pressure to leave a residue, to which was added methanol (20 ml). This mixture was filtered under reduced pressure, the colourless solid was collected, and recrystallized from ethanol; M.pt: 482–484 K, yield 69%. Colourless blocks were obtained by slow evaporation of a 1:9 dichloromethane:acetonitrile solution at room temperature. UV (acetonitrile, λmax. (ε) - nm, L.mol-1.cm-1): 212 (3.9x104), 245.5 (3.08x104), 317 (5.8x103). IR (KBr) (cm-1): 3065.4, 2972.7, 2935.9, 1646.2, 1586.0, 1495.4, 1450.1, 1413.3, 1389.4, 1326.2, 1264.9, 1240.4, 1180.6, 1160.1, 1105.0, 1068.7, 1042.0, 1018.4, 953.3, 914.2, 854.2, 765.1, 725.9. GC—MS m/z (abundance): 480 (<1%), 238 (11%), 214 (1%), 199 (1%), 181 (1%), 159 (1%), 130 (1%), 105 (100%), 77 (17%), 51 (2%). HRMS: m/z 480.2020 (theoretical 480.2036) 1H NMR (CDCl3) δ (p.p.m.): 8.16 (1H, m); 8.12 (1H, m); 7.77–7.68 (4H, m); 7.44 (1H, dt, J = 7.02 and 1.36 Hz); 7.32 (1H, dt, J = 6.20 and 1.36 Hz); 7.24–7.18 (6H, m); 4.34–4.14 (2H, m); 3.96–3.89 (2H, m); 3.02–2.76 (2H, m), 1.87 (2H, J = 6.48 and 1.62 Hz); 1.42 (3H, s); 1.38 (3H, s). 13C NMR (CDCl3) δ (p.p.m.): 17.39; 26.63; 26.82; 32.09; 61.41; 61.78; 74.03; 94.43; 95.10; 106.6; 119.75; 121.54; 123.27; 123.99. 125.57; 127.27; 127.67; 128.52; 134.46. 137.46; 137.79; 144.10.
The C-bound H atoms were geometrically placed (C—H = 0.95–0.99 Å) and refined as riding with Uiso(H) = 1.2–1.5Ueq(C).
Data collection: COLLECT (Hooft, 1998); cell
DENZO (Otwinowski & Minor, 1997) and COLLECT (Hooft, 1998); data reduction: DENZO (Otwinowski & Minor, 1997) and COLLECT (Hooft, 1998); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and DIAMOND (Brandenburg, 2006); software used to prepare material for publication: publCIF (Westrip, 2010).Fig. 1. Chemical structures of lapachol, α-lapachone and β-lapachone | |
Fig. 2. Reaction scheme for the synthesis of the title compound, (I). | |
Fig. 3. The molecular structure of (I) showing the atom-labelling scheme and displacement ellipsoids at the 50% probability level. | |
Fig. 4. A view in projection down the b axis of the unit-cell contents of (I). The C—H···π interactions are shown as purple dashed lines respectively. |
C31H28O5 | F(000) = 1016 |
Mr = 480.53 | Dx = 1.304 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 5547 reflections |
a = 15.1335 (6) Å | θ = 2.9–27.5° |
b = 9.6048 (2) Å | µ = 0.09 mm−1 |
c = 16.9739 (6) Å | T = 120 K |
β = 97.384 (1)° | Slab, colourless |
V = 2446.77 (14) Å3 | 0.36 × 0.28 × 0.07 mm |
Z = 4 |
Bruker-Nonius Roper CCD camera on a κ-goniostat diffractometer | 5549 independent reflections |
Radiation source: Bruker–Nonius FR591 rotating anode | 3390 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.059 |
Detector resolution: 9.091 pixels mm-1 | θmax = 27.4°, θmin = 3.2° |
ϕ & ω scans | h = −15→19 |
Absorption correction: multi-scan (SADABS; Sheldrick, 2003) | k = −12→12 |
Tmin = 0.831, Tmax = 1.000 | l = −21→21 |
23103 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)] = 0.050 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.139 | H-atom parameters constrained |
S = 1.02 | w = 1/[σ2(Fo2) + (0.0726P)2] where P = (Fo2 + 2Fc2)/3 |
5549 reflections | (Δ/σ)max < 0.001 |
355 parameters | Δρmax = 0.25 e Å−3 |
0 restraints | Δρmin = −0.29 e Å−3 |
C31H28O5 | V = 2446.77 (14) Å3 |
Mr = 480.53 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 15.1335 (6) Å | µ = 0.09 mm−1 |
b = 9.6048 (2) Å | T = 120 K |
c = 16.9739 (6) Å | 0.36 × 0.28 × 0.07 mm |
β = 97.384 (1)° |
Bruker-Nonius Roper CCD camera on a κ-goniostat diffractometer | 5549 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 2003) | 3390 reflections with I > 2σ(I) |
Tmin = 0.831, Tmax = 1.000 | Rint = 0.059 |
23103 measured reflections |
R[F2 > 2σ(F2)] = 0.050 | 0 restraints |
wR(F2) = 0.139 | H-atom parameters constrained |
S = 1.02 | Δρmax = 0.25 e Å−3 |
5549 reflections | Δρmin = −0.29 e Å−3 |
355 parameters |
Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'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 > 2σ(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 | ||
O1 | 0.07265 (9) | 0.34146 (11) | 0.23877 (7) | 0.0227 (3) | |
O2 | 0.17388 (8) | 0.21646 (11) | −0.00687 (7) | 0.0212 (3) | |
O3 | 0.22585 (8) | −0.04598 (11) | 0.05583 (7) | 0.0197 (3) | |
O4 | 0.16943 (9) | 0.13692 (12) | −0.13294 (7) | 0.0241 (3) | |
O5 | 0.10415 (8) | −0.05976 (11) | −0.03375 (7) | 0.0220 (3) | |
C2 | 0.03141 (13) | 0.46851 (17) | 0.20263 (11) | 0.0249 (4) | |
C3 | 0.09216 (14) | 0.52936 (17) | 0.14656 (11) | 0.0272 (5) | |
H3A | 0.1507 | 0.5521 | 0.1769 | 0.031 (5)* | |
H3B | 0.0658 | 0.6168 | 0.1232 | 0.030 (5)* | |
C4 | 0.10551 (14) | 0.42770 (17) | 0.08004 (11) | 0.0246 (4) | |
H4A | 0.0510 | 0.4243 | 0.0410 | 0.025 (5)* | |
H4B | 0.1555 | 0.4595 | 0.0522 | 0.024 (5)* | |
C4A | 0.12557 (12) | 0.28463 (16) | 0.11431 (10) | 0.0188 (4) | |
C5 | 0.18803 (12) | 0.05363 (16) | 0.10082 (10) | 0.0172 (4) | |
C6 | 0.16391 (12) | 0.18128 (17) | 0.06989 (10) | 0.0184 (4) | |
C6A | 0.17505 (12) | 0.01886 (16) | 0.17947 (10) | 0.0171 (4) | |
C7 | 0.19548 (12) | −0.11445 (17) | 0.21269 (10) | 0.0200 (4) | |
H7 | 0.2207 | −0.1834 | 0.1823 | 0.013 (4)* | |
C8 | 0.17912 (12) | −0.14461 (18) | 0.28843 (10) | 0.0231 (4) | |
H8 | 0.1916 | −0.2351 | 0.3095 | 0.019 (5)* | |
C9 | 0.14399 (13) | −0.04266 (18) | 0.33515 (11) | 0.0253 (5) | |
H9 | 0.1342 | −0.0639 | 0.3880 | 0.036 (6)* | |
C10 | 0.12390 (13) | 0.08757 (17) | 0.30443 (10) | 0.0216 (4) | |
H10 | 0.1010 | 0.1562 | 0.3366 | 0.031 (5)* | |
C10A | 0.13687 (12) | 0.12094 (17) | 0.22567 (10) | 0.0181 (4) | |
C10B | 0.11111 (12) | 0.25221 (17) | 0.19031 (10) | 0.0184 (4) | |
C11 | 0.02511 (16) | 0.56118 (19) | 0.27419 (12) | 0.0355 (5) | |
H11A | 0.0849 | 0.5773 | 0.3023 | 0.046 (7)* | |
H11B | −0.0118 | 0.5156 | 0.3100 | 0.035 (6)* | |
H11C | −0.0018 | 0.6504 | 0.2564 | 0.046 (6)* | |
C12 | −0.06075 (14) | 0.4327 (2) | 0.16053 (13) | 0.0343 (5) | |
H12A | −0.0552 | 0.3644 | 0.1185 | 0.045 (6)* | |
H12B | −0.0893 | 0.5172 | 0.1371 | 0.040 (6)* | |
H12C | −0.0971 | 0.3933 | 0.1989 | 0.033 (6)* | |
C13 | 0.21410 (13) | 0.11661 (18) | −0.05551 (10) | 0.0207 (4) | |
C14 | 0.07502 (13) | 0.10801 (18) | −0.13920 (11) | 0.0267 (5) | |
H14A | 0.0477 | 0.1202 | −0.1950 | 0.026 (5)* | |
H14B | 0.0464 | 0.1745 | −0.1058 | 0.034 (5)* | |
C15 | 0.05956 (14) | −0.03797 (18) | −0.11270 (11) | 0.0256 (5) | |
H15A | −0.0051 | −0.0544 | −0.1136 | 0.031 (5)* | |
H15B | 0.0823 | −0.1049 | −0.1496 | 0.022 (5)* | |
C16 | 0.19741 (12) | −0.03490 (17) | −0.02661 (10) | 0.0193 (4) | |
C17 | 0.31092 (13) | 0.15683 (17) | −0.05503 (10) | 0.0220 (4) | |
C18 | 0.37148 (16) | 0.1396 (3) | 0.01208 (12) | 0.0485 (7) | |
H18 | 0.3530 | 0.0973 | 0.0578 | 0.069 (8)* | |
C19 | 0.45920 (16) | 0.1832 (3) | 0.01376 (13) | 0.0561 (7) | |
H19 | 0.5001 | 0.1697 | 0.0605 | 0.082 (9)* | |
C20 | 0.48716 (16) | 0.2452 (2) | −0.05084 (13) | 0.0407 (6) | |
H20 | 0.5471 | 0.2755 | −0.0494 | 0.053 (7)* | |
C21 | 0.42738 (15) | 0.2634 (2) | −0.11828 (14) | 0.0427 (6) | |
H21 | 0.4464 | 0.3058 | −0.1638 | 0.048 (6)* | |
C22 | 0.33982 (14) | 0.2206 (2) | −0.12029 (13) | 0.0341 (5) | |
H22 | 0.2991 | 0.2351 | −0.1670 | 0.050 (7)* | |
C23 | 0.24471 (13) | −0.15056 (17) | −0.06662 (10) | 0.0216 (4) | |
C24 | 0.27317 (14) | −0.13653 (19) | −0.14065 (11) | 0.0285 (5) | |
H24 | 0.2670 | −0.0496 | −0.1674 | 0.042 (6)* | |
C25 | 0.31066 (14) | −0.2488 (2) | −0.17594 (12) | 0.0321 (5) | |
H25 | 0.3301 | −0.2380 | −0.2266 | 0.045 (6)* | |
C26 | 0.31977 (15) | −0.3756 (2) | −0.13795 (12) | 0.0345 (5) | |
H26 | 0.3456 | −0.4520 | −0.1622 | 0.038 (6)* | |
C27 | 0.29106 (15) | −0.3912 (2) | −0.06409 (12) | 0.0351 (5) | |
H27 | 0.2971 | −0.4786 | −0.0377 | 0.037 (6)* | |
C28 | 0.25370 (13) | −0.28000 (18) | −0.02881 (12) | 0.0282 (5) | |
H28 | 0.2339 | −0.2916 | 0.0217 | 0.031 (5)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0249 (8) | 0.0204 (6) | 0.0237 (7) | 0.0053 (5) | 0.0061 (6) | −0.0014 (5) |
O2 | 0.0252 (8) | 0.0203 (6) | 0.0191 (7) | 0.0007 (5) | 0.0068 (6) | 0.0029 (5) |
O3 | 0.0209 (8) | 0.0211 (6) | 0.0173 (6) | 0.0028 (5) | 0.0035 (5) | −0.0014 (5) |
O4 | 0.0229 (8) | 0.0300 (7) | 0.0189 (7) | −0.0040 (5) | 0.0003 (6) | 0.0026 (5) |
O5 | 0.0152 (7) | 0.0267 (6) | 0.0234 (7) | −0.0026 (5) | −0.0002 (6) | 0.0017 (5) |
C2 | 0.0244 (12) | 0.0183 (9) | 0.0323 (11) | 0.0036 (8) | 0.0051 (9) | −0.0006 (8) |
C3 | 0.0301 (12) | 0.0177 (9) | 0.0344 (11) | 0.0019 (8) | 0.0058 (10) | 0.0010 (8) |
C4 | 0.0273 (12) | 0.0212 (9) | 0.0260 (10) | 0.0019 (8) | 0.0056 (9) | 0.0024 (8) |
C4A | 0.0154 (10) | 0.0187 (9) | 0.0220 (10) | −0.0021 (7) | 0.0007 (8) | 0.0016 (7) |
C5 | 0.0141 (10) | 0.0186 (9) | 0.0191 (9) | 0.0001 (7) | 0.0024 (8) | −0.0031 (7) |
C6 | 0.0156 (10) | 0.0229 (9) | 0.0169 (9) | −0.0050 (7) | 0.0029 (8) | 0.0002 (7) |
C6A | 0.0132 (10) | 0.0186 (8) | 0.0189 (9) | −0.0028 (7) | 0.0001 (8) | 0.0009 (7) |
C7 | 0.0170 (11) | 0.0191 (9) | 0.0233 (10) | 0.0008 (7) | 0.0003 (8) | −0.0004 (7) |
C8 | 0.0186 (11) | 0.0246 (10) | 0.0251 (10) | 0.0022 (8) | −0.0007 (8) | 0.0064 (8) |
C9 | 0.0229 (12) | 0.0327 (11) | 0.0208 (10) | 0.0005 (8) | 0.0044 (9) | 0.0051 (8) |
C10 | 0.0194 (11) | 0.0250 (9) | 0.0210 (10) | 0.0006 (8) | 0.0044 (8) | −0.0020 (8) |
C10A | 0.0138 (10) | 0.0213 (9) | 0.0190 (9) | −0.0019 (7) | 0.0010 (8) | −0.0007 (7) |
C10B | 0.0135 (10) | 0.0201 (8) | 0.0213 (10) | −0.0004 (7) | 0.0011 (8) | −0.0031 (7) |
C11 | 0.0412 (15) | 0.0277 (11) | 0.0398 (13) | 0.0035 (10) | 0.0137 (11) | −0.0045 (9) |
C12 | 0.0246 (13) | 0.0333 (11) | 0.0444 (13) | 0.0052 (9) | 0.0025 (10) | 0.0053 (10) |
C13 | 0.0203 (11) | 0.0269 (9) | 0.0154 (9) | −0.0005 (8) | 0.0048 (8) | −0.0017 (7) |
C14 | 0.0211 (12) | 0.0299 (10) | 0.0272 (11) | −0.0021 (8) | −0.0042 (9) | 0.0037 (8) |
C15 | 0.0205 (12) | 0.0304 (10) | 0.0237 (10) | −0.0015 (8) | −0.0049 (9) | 0.0001 (8) |
C16 | 0.0164 (11) | 0.0257 (9) | 0.0156 (9) | −0.0034 (7) | 0.0012 (8) | 0.0000 (7) |
C17 | 0.0204 (11) | 0.0238 (9) | 0.0225 (10) | −0.0036 (8) | 0.0057 (9) | −0.0035 (7) |
C18 | 0.0318 (15) | 0.0891 (18) | 0.0237 (12) | −0.0267 (13) | 0.0000 (11) | 0.0119 (11) |
C19 | 0.0288 (15) | 0.110 (2) | 0.0274 (13) | −0.0285 (14) | −0.0049 (11) | 0.0131 (13) |
C20 | 0.0234 (13) | 0.0611 (14) | 0.0387 (13) | −0.0159 (11) | 0.0079 (11) | −0.0002 (11) |
C21 | 0.0281 (14) | 0.0603 (14) | 0.0405 (14) | −0.0078 (11) | 0.0072 (11) | 0.0179 (11) |
C22 | 0.0230 (12) | 0.0445 (12) | 0.0344 (12) | −0.0028 (9) | 0.0027 (10) | 0.0121 (9) |
C23 | 0.0171 (11) | 0.0250 (10) | 0.0222 (10) | −0.0012 (8) | 0.0005 (8) | −0.0057 (7) |
C24 | 0.0295 (13) | 0.0298 (10) | 0.0262 (11) | −0.0041 (9) | 0.0033 (9) | −0.0061 (8) |
C25 | 0.0295 (13) | 0.0384 (12) | 0.0295 (12) | −0.0050 (9) | 0.0081 (10) | −0.0128 (9) |
C26 | 0.0334 (13) | 0.0337 (11) | 0.0358 (12) | 0.0060 (9) | 0.0021 (10) | −0.0154 (9) |
C27 | 0.0420 (15) | 0.0278 (11) | 0.0347 (12) | 0.0109 (9) | 0.0014 (11) | −0.0049 (9) |
C28 | 0.0290 (13) | 0.0303 (11) | 0.0250 (11) | 0.0032 (8) | 0.0028 (9) | −0.0037 (8) |
O1—C10B | 1.369 (2) | C11—H11B | 0.9800 |
O1—C2 | 1.468 (2) | C11—H11C | 0.9800 |
O2—C6 | 1.373 (2) | C12—H12A | 0.9800 |
O2—C13 | 1.449 (2) | C12—H12B | 0.9800 |
O3—C5 | 1.3923 (19) | C12—H12C | 0.9800 |
O3—C16 | 1.414 (2) | C13—C17 | 1.514 (3) |
O4—C13 | 1.412 (2) | C13—C16 | 1.567 (2) |
O4—C14 | 1.446 (2) | C14—C15 | 1.500 (2) |
O5—C16 | 1.421 (2) | C14—H14A | 0.9900 |
O5—C15 | 1.436 (2) | C14—H14B | 0.9900 |
C2—C11 | 1.519 (3) | C15—H15A | 0.9900 |
C2—C12 | 1.523 (3) | C15—H15B | 0.9900 |
C2—C3 | 1.522 (3) | C16—C23 | 1.527 (2) |
C3—C4 | 1.526 (2) | C17—C18 | 1.377 (3) |
C3—H3A | 0.9900 | C17—C22 | 1.385 (3) |
C3—H3B | 0.9900 | C18—C19 | 1.389 (3) |
C4—C4A | 1.508 (2) | C18—H18 | 0.9500 |
C4—H4A | 0.9900 | C19—C20 | 1.362 (3) |
C4—H4B | 0.9900 | C19—H19 | 0.9500 |
C4A—C10B | 1.372 (2) | C20—C21 | 1.376 (3) |
C4A—C6 | 1.415 (2) | C20—H20 | 0.9500 |
C5—C6 | 1.365 (2) | C21—C22 | 1.384 (3) |
C5—C6A | 1.414 (2) | C21—H21 | 0.9500 |
C6A—C7 | 1.417 (2) | C22—H22 | 0.9500 |
C6A—C10A | 1.424 (2) | C23—C24 | 1.386 (3) |
C7—C8 | 1.371 (2) | C23—C28 | 1.398 (3) |
C7—H7 | 0.9500 | C24—C25 | 1.390 (3) |
C8—C9 | 1.407 (2) | C24—H24 | 0.9500 |
C8—H8 | 0.9500 | C25—C26 | 1.376 (3) |
C9—C10 | 1.374 (2) | C25—H25 | 0.9500 |
C9—H9 | 0.9500 | C26—C27 | 1.387 (3) |
C10—C10A | 1.413 (2) | C26—H26 | 0.9500 |
C10—H10 | 0.9500 | C27—C28 | 1.381 (3) |
C10A—C10B | 1.429 (2) | C27—H27 | 0.9500 |
C11—H11A | 0.9800 | C28—H28 | 0.9500 |
C10B—O1—C2 | 117.40 (13) | H12A—C12—H12C | 109.5 |
C6—O2—C13 | 118.89 (12) | H12B—C12—H12C | 109.5 |
C5—O3—C16 | 113.37 (12) | O4—C13—O2 | 104.65 (13) |
C13—O4—C14 | 113.10 (13) | O4—C13—C17 | 108.48 (14) |
C16—O5—C15 | 113.43 (13) | O2—C13—C17 | 107.76 (13) |
O1—C2—C11 | 102.70 (15) | O4—C13—C16 | 110.04 (13) |
O1—C2—C12 | 108.83 (14) | O2—C13—C16 | 109.86 (13) |
C11—C2—C12 | 111.10 (17) | C17—C13—C16 | 115.48 (15) |
O1—C2—C3 | 108.77 (15) | O4—C14—C15 | 110.38 (15) |
C11—C2—C3 | 112.34 (15) | O4—C14—H14A | 109.6 |
C12—C2—C3 | 112.56 (17) | C15—C14—H14A | 109.6 |
C2—C3—C4 | 111.41 (15) | O4—C14—H14B | 109.6 |
C2—C3—H3A | 109.3 | C15—C14—H14B | 109.6 |
C4—C3—H3A | 109.3 | H14A—C14—H14B | 108.1 |
C2—C3—H3B | 109.3 | O5—C15—C14 | 110.08 (14) |
C4—C3—H3B | 109.3 | O5—C15—H15A | 109.6 |
H3A—C3—H3B | 108.0 | C14—C15—H15A | 109.6 |
C4A—C4—C3 | 109.69 (15) | O5—C15—H15B | 109.6 |
C4A—C4—H4A | 109.7 | C14—C15—H15B | 109.6 |
C3—C4—H4A | 109.7 | H15A—C15—H15B | 108.2 |
C4A—C4—H4B | 109.7 | O3—C16—O5 | 104.15 (13) |
C3—C4—H4B | 109.7 | O3—C16—C23 | 106.55 (13) |
H4A—C4—H4B | 108.2 | O5—C16—C23 | 110.91 (13) |
C10B—C4A—C6 | 117.89 (15) | O3—C16—C13 | 109.81 (13) |
C10B—C4A—C4 | 121.41 (15) | O5—C16—C13 | 109.13 (14) |
C6—C4A—C4 | 120.64 (15) | C23—C16—C13 | 115.64 (14) |
C6—C5—O3 | 120.98 (15) | C18—C17—C22 | 118.01 (18) |
C6—C5—C6A | 120.83 (15) | C18—C17—C13 | 120.96 (16) |
O3—C5—C6A | 118.18 (14) | C22—C17—C13 | 120.89 (17) |
C5—C6—O2 | 121.97 (15) | C17—C18—C19 | 120.9 (2) |
C5—C6—C4A | 122.20 (15) | C17—C18—H18 | 119.6 |
O2—C6—C4A | 115.82 (14) | C19—C18—H18 | 119.6 |
C5—C6A—C7 | 122.64 (15) | C20—C19—C18 | 120.7 (2) |
C5—C6A—C10A | 118.22 (15) | C20—C19—H19 | 119.7 |
C7—C6A—C10A | 119.10 (15) | C18—C19—H19 | 119.7 |
C8—C7—C6A | 120.50 (16) | C19—C20—C21 | 119.1 (2) |
C8—C7—H7 | 119.7 | C19—C20—H20 | 120.5 |
C6A—C7—H7 | 119.7 | C21—C20—H20 | 120.5 |
C7—C8—C9 | 120.56 (16) | C20—C21—C22 | 120.5 (2) |
C7—C8—H8 | 119.7 | C20—C21—H21 | 119.7 |
C9—C8—H8 | 119.7 | C22—C21—H21 | 119.7 |
C10—C9—C8 | 120.06 (16) | C21—C22—C17 | 120.8 (2) |
C10—C9—H9 | 120.0 | C21—C22—H22 | 119.6 |
C8—C9—H9 | 120.0 | C17—C22—H22 | 119.6 |
C9—C10—C10A | 120.97 (16) | C24—C23—C28 | 118.65 (16) |
C9—C10—H10 | 119.5 | C24—C23—C16 | 123.39 (16) |
C10A—C10—H10 | 119.5 | C28—C23—C16 | 117.79 (16) |
C10—C10A—C6A | 118.73 (15) | C23—C24—C25 | 120.46 (18) |
C10—C10A—C10B | 122.27 (15) | C23—C24—H24 | 119.8 |
C6A—C10A—C10B | 118.98 (15) | C25—C24—H24 | 119.8 |
O1—C10B—C4A | 123.68 (15) | C26—C25—C24 | 120.42 (19) |
O1—C10B—C10A | 114.48 (14) | C26—C25—H25 | 119.8 |
C4A—C10B—C10A | 121.83 (15) | C24—C25—H25 | 119.8 |
C2—C11—H11A | 109.5 | C25—C26—C27 | 119.69 (18) |
C2—C11—H11B | 109.5 | C25—C26—H26 | 120.2 |
H11A—C11—H11B | 109.5 | C27—C26—H26 | 120.2 |
C2—C11—H11C | 109.5 | C28—C27—C26 | 120.10 (19) |
H11A—C11—H11C | 109.5 | C28—C27—H27 | 119.9 |
H11B—C11—H11C | 109.5 | C26—C27—H27 | 119.9 |
C2—C12—H12A | 109.5 | C27—C28—C23 | 120.67 (18) |
C2—C12—H12B | 109.5 | C27—C28—H28 | 119.7 |
H12A—C12—H12B | 109.5 | C23—C28—H28 | 119.7 |
C2—C12—H12C | 109.5 | ||
C10B—O1—C2—C11 | −161.60 (15) | C6—O2—C13—O4 | 145.39 (14) |
C10B—O1—C2—C12 | 80.58 (19) | C6—O2—C13—C17 | −99.29 (17) |
C10B—O1—C2—C3 | −42.4 (2) | C6—O2—C13—C16 | 27.3 (2) |
O1—C2—C3—C4 | 60.8 (2) | C13—O4—C14—C15 | −56.94 (18) |
C11—C2—C3—C4 | 173.82 (16) | C16—O5—C15—C14 | −57.79 (19) |
C12—C2—C3—C4 | −59.9 (2) | O4—C14—C15—O5 | 55.3 (2) |
C2—C3—C4—C4A | −46.2 (2) | C5—O3—C16—O5 | −62.68 (16) |
C3—C4—C4A—C10B | 14.3 (2) | C5—O3—C16—C23 | −179.99 (13) |
C3—C4—C4A—C6 | −162.79 (17) | C5—O3—C16—C13 | 54.07 (18) |
C16—O3—C5—C6 | −29.5 (2) | C15—O5—C16—O3 | 173.41 (12) |
C16—O3—C5—C6A | 150.33 (15) | C15—O5—C16—C23 | −72.34 (16) |
O3—C5—C6—O2 | 1.4 (3) | C15—O5—C16—C13 | 56.18 (16) |
C6A—C5—C6—O2 | −178.46 (16) | O4—C13—C16—O3 | −167.72 (13) |
O3—C5—C6—C4A | −179.82 (16) | O2—C13—C16—O3 | −53.02 (18) |
C6A—C5—C6—C4A | 0.3 (3) | C17—C13—C16—O3 | 69.09 (18) |
C13—O2—C6—C5 | −2.2 (2) | O4—C13—C16—O5 | −54.14 (17) |
C13—O2—C6—C4A | 178.95 (15) | O2—C13—C16—O5 | 60.56 (17) |
C10B—C4A—C6—C5 | −1.3 (3) | C17—C13—C16—O5 | −177.33 (13) |
C4—C4A—C6—C5 | 175.85 (17) | O4—C13—C16—C23 | 71.70 (19) |
C10B—C4A—C6—O2 | 177.52 (16) | O2—C13—C16—C23 | −173.60 (14) |
C4—C4A—C6—O2 | −5.3 (2) | C17—C13—C16—C23 | −51.5 (2) |
C6—C5—C6A—C7 | 177.14 (17) | O4—C13—C17—C18 | −176.17 (18) |
O3—C5—C6A—C7 | −2.7 (3) | O2—C13—C17—C18 | 71.1 (2) |
C6—C5—C6A—C10A | −0.5 (3) | C16—C13—C17—C18 | −52.2 (2) |
O3—C5—C6A—C10A | 179.63 (15) | O4—C13—C17—C22 | 8.2 (2) |
C5—C6A—C7—C8 | −177.93 (18) | O2—C13—C17—C22 | −104.54 (18) |
C10A—C6A—C7—C8 | −0.3 (3) | C16—C13—C17—C22 | 132.24 (18) |
C6A—C7—C8—C9 | −1.7 (3) | C22—C17—C18—C19 | −0.9 (3) |
C7—C8—C9—C10 | 1.5 (3) | C13—C17—C18—C19 | −176.6 (2) |
C8—C9—C10—C10A | 0.8 (3) | C17—C18—C19—C20 | 0.6 (4) |
C9—C10—C10A—C6A | −2.8 (3) | C18—C19—C20—C21 | −0.4 (4) |
C9—C10—C10A—C10B | 175.73 (17) | C19—C20—C21—C22 | 0.6 (4) |
C5—C6A—C10A—C10 | −179.76 (16) | C20—C21—C22—C17 | −0.9 (3) |
C7—C6A—C10A—C10 | 2.5 (3) | C18—C17—C22—C21 | 1.1 (3) |
C5—C6A—C10A—C10B | 1.7 (2) | C13—C17—C22—C21 | 176.80 (19) |
C7—C6A—C10A—C10B | −176.06 (16) | O3—C16—C23—C24 | −145.17 (17) |
C2—O1—C10B—C4A | 10.7 (2) | O5—C16—C23—C24 | 102.1 (2) |
C2—O1—C10B—C10A | −170.26 (15) | C13—C16—C23—C24 | −22.8 (2) |
C6—C4A—C10B—O1 | −178.42 (16) | O3—C16—C23—C28 | 39.6 (2) |
C4—C4A—C10B—O1 | 4.4 (3) | O5—C16—C23—C28 | −73.1 (2) |
C6—C4A—C10B—C10A | 2.6 (3) | C13—C16—C23—C28 | 161.93 (16) |
C4—C4A—C10B—C10A | −174.60 (16) | C28—C23—C24—C25 | −0.6 (3) |
C10—C10A—C10B—O1 | −0.4 (2) | C16—C23—C24—C25 | −175.84 (18) |
C6A—C10A—C10B—O1 | 178.11 (15) | C23—C24—C25—C26 | 0.2 (3) |
C10—C10A—C10B—C4A | 178.70 (17) | C24—C25—C26—C27 | 0.2 (3) |
C6A—C10A—C10B—C4A | −2.8 (3) | C25—C26—C27—C28 | −0.1 (3) |
C14—O4—C13—O2 | −62.31 (16) | C26—C27—C28—C23 | −0.3 (3) |
C14—O4—C13—C17 | −177.13 (13) | C24—C23—C28—C27 | 0.7 (3) |
C14—O4—C13—C16 | 55.67 (17) | C16—C23—C28—C27 | 176.17 (18) |
Cg1 is the centroid of the C4A,C5,C6,C6A,C10A,C10B benzene ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C18—H18···O3 | 0.95 | 2.36 | 3.001 (3) | 124 |
C22—H22···O4 | 0.95 | 2.32 | 2.683 (3) | 102 |
C24—H24···O4 | 0.95 | 2.44 | 3.071 (2) | 124 |
C8—H8···Cg1i | 0.95 | 2.65 | 3.3134 (19) | 128 |
C15—H15A···Cg1ii | 0.99 | 2.39 | 3.336 (2) | 161 |
Symmetry codes: (i) x+1/2, −y−1/2, z+1/2; (ii) −x, −y, −z. |
Cg1 is the centroid of the C4A,C5,C6,C6A,C10A,C10B benzene ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C18—H18···O3 | 0.95 | 2.36 | 3.001 (3) | 124 |
C22—H22···O4 | 0.95 | 2.32 | 2.683 (3) | 102 |
C24—H24···O4 | 0.95 | 2.44 | 3.071 (2) | 124 |
C8—H8···Cg1i | 0.95 | 2.65 | 3.3134 (19) | 128 |
C15—H15A···Cg1ii | 0.99 | 2.39 | 3.336 (2) | 161 |
Symmetry codes: (i) x+1/2, −y−1/2, z+1/2; (ii) −x, −y, −z. |
Acknowledgements
The use of the EPSRC X-ray crystallographic service at the University of Southampton, England, and the valuable assistance of the staff there is gratefully acknowledged. BB and JLW thank CAPES (Brazil) for support. Dr Maira Fasciotti, Inmetro (Brazil), is gratefuly acknowledged for the HRMS analysis. Support from the Ministry of Higher Education, Malaysia, High-Impact Research scheme (UM.C/HIR-MOHE/SC/12) is also gratefully acknowledged.
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
Isomeric, lapachol, 2-hydroxy-3-(3-methyl-2-butenyl)-1,4-naphthoquinone, β-lapachone, 2,2-dimethyl-3,4-dihydro-2H-benzo[h]chromene-5,6-dione, and α-lapachone, 2,2-dimethyl-3,4-dihydro-2H-benzo[g]chromene-5,10-dione, Fig. 1, are found in the wood of trees of the genus, Tabebuia (family Bignoniaceae), distributed throughout Central and South America. Since their discovery at the end of the 19th century, lapachol and its isomers have attracted much attention due to their biological activities (de Almeida, 2009; Ferreira et al., 2010). Studies have revealed the effectiveness of these compounds and their derivatives as anti-cancer and anti-neoplastic (de Almeida, 2009), anti-fungal (Medeiros et al., 2010) and anti-Trypanosoma cruzi agents (Neves-Pinto et al., 2002), among other activities.
The quinone O atoms in lapachol and the lapachones are active sites and reactions at these sites have led to various derivatives, including oximes (da Silva et al., 2011), α-diazocarbonyls (Ferreira et al., 2006), phenazines (Neves-Pinto et al., 2002) and as we report here, a dihydrodioxin, (I), which was obtained by photoaddition of β-lapachone to 5,6-diphenyl-2,3-dihydro-1,4-dioxine, Fig. 2. Dihydrodioxins, most readily formed by a photochemical reaction between ortho-quinones and alkenes (Schönberg & Mustafa, 1944), are able to perform efficient DNA photo-cleavage (Mack et al., 2004). The crystal structure of β-lapachone has been reported (Cunha-Filho et al., 2006).
In (I), Fig. 3, the pyran ring approximates an envelope conformation with the C3 atom being the flap atom. The dioxine ring also has an envelope conformation where the C16 atom is the flap. With respect to this ring, the C17- and C23-bound phenyl rings are in axial and equatorial positions, respectively, and make a dihedral angle of 82.11 (10)° with each other. The orientation of these rings is such to facilitate the formation of intramolecular C—H···O interactions, Table 1. Finally, a chair conformation is found for the dioxane ring.
The major feature of the crystal packing is the formation of supramolecular layers parallel to (1 0 1) and sustained by C—H···π interactions, Table 1. These stack with no specific intermolecular interactions between them, Fig. 4.