organic compounds
Redetermination and
of atalaphyllineaX-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia, and bCrystal Materials Research Unit, Department of Chemistry, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand
*Correspondence e-mail: hkfun@usm.my
The title acridone alkaloid [systematic name: 1,3,5-trihydroxy-2,4-bis(3-methylbut-2-enyl)acridin-9(10H)-one], C23H25NO4, has previously been reported as crystallizing in the chiral orthorhombic P212121 [Chantrapromma et al. (2010). Acta Cryst. E66, o81–o82] but the could not be determined from data collected with Mo radiation. The has now been determined by of the with data collected using Cu radiation. All features of the molecule and its crystal packing are similar to those previously described.
Related literature
For details of acridone ). For the previous see: Chantrapromma et al. (2010). For hydrogen-bond motifs, see Bernstein et al. (1995). For bond-length data, see: Allen et al. (1987). For the stability of the temperature controller used in the data collection, see Cosier & Glazer, (1986).
see: Basu & Basa (1972Experimental
Crystal data
|
Data collection: APEX2 (Bruker, 2009); cell SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009).
Supporting information
https://doi.org/10.1107/S160053680905449X/sj2714sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S160053680905449X/sj2714Isup2.hkl
The compound was isolated and crystal grown as reported by Chantrapromma et al. (2010).
All H atoms were located from the difference map and isotropically refined. The highest residual electron density peak is located at 0.66 Å from C3 and the deepest hole is located at 0.84 Å from H1N1. 1280 Friedel pairs were used to find the absolute configuration.
The title acridone alkaloid (I) known as atalaphylline (Basu & Basa, 1972), was isolated from the roots of Atalantia monophylla Corrêa, a mangrove plant which was collected from Trang province in the southern part of Thailand. Although (I) has been previously reported (Chantrapromma et al., 2010), the α X-radiation with the being refined to 0.05 (13). We report herein the of (I) with data collected using Cu radiation.
could not be determined due to insufficient from the light atoms using the data set collected with Mo radiation. The data of the same sample was recollected using Cu radiation with our newly-installed Bruker Apex-Duo CCD diffractometer and the absolute configulation was determined by making use of the large of Cu KFig. 1 shows the molecular structure of (I), bond lengths and angles are closely similar to those previously described (Chantrapromma et al., 2010). (I) is chiral even though it has no chiral center because its mirror image cannot be superposed onto itself. This is due to the arrangements of the two 3-methylbut-2-enyl side-chains at atoms C1 and C12. (I) crystallized as a single
in chiral orthorhombic P212121 The current represents a significant improvement compared with the structure determined from the data taken with Mo radiation and it confirmed the absolute conformation of the side-chains for (I). To be precise the two 3-methyl-2-enyl groups at C1 and C12 are attached in such a way that these two side-chains are below the acridone molecular plane indicating the (-)-anticlinal conformation with the torsion angles C2–C1–C19–C20 and C13–C12–C14–C15 are -102.65 (13) and -119.77 (33)°, respectively.Fig. 2 shows the crystal packing of (I). Intermolecular O—H···O hydrogen bonds and weak C—H···O interactions (Table 1) linked the molecules into infinite one dimensional screw-chains along the [0 1 0] direction. These features are similar to those of the previous report by Chantrapromma et al. (2010) except there is an additional weak intermolecular C—H···O interaction and a π–π interaction with a Cg1···Cg2 distance of 3.7643 (7) Å (symmetry code: -1+x, y, z); Cg1 and Cg2 are the centroids of C3–C5/C10–C11/N1 and C5–C10 rings, respectively . These differences are due to the fact that all the hydrogen atoms are refined freely whereas in previous report by Chantrapromma et al. (2010), the hydrogen atoms were positioned geometrically and allowed to ride on their parent atoms.
For details of acridone
see: Basu & Basa (1972). For the previous see: Chantrapromma et al. (2010). For hydrogen-bond motifs, see Bernstein et al. (1995). For bond-length data, see: Allen et al. (1987). For the stability of the temperature controller used in the data collection, see Cosier & Glazer, (1986).Data collection: APEX2 (Bruker, 2009); cell
SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).Fig. 1. The structure of (I), showing 50% probability displacement ellipsoids and the atom-numbering scheme. Intramolecular hydrogen bonds are shown as dashed lines. | |
Fig. 2. The crystal packing of (I) viewed along the a axis, showing screw chains along the [0 1 0] direction. Hydrogen bonds are shown as dashed lines. |
C23H25NO4 | F(000) = 808 |
Mr = 379.44 | Dx = 1.339 Mg m−3 |
Orthorhombic, P212121 | Cu Kα radiation, λ = 1.54178 Å |
Hall symbol: P 2ac 2ab | Cell parameters from 3145 reflections |
a = 5.0838 (1) Å | θ = 6.1–64.9° |
b = 15.0262 (3) Å | µ = 0.74 mm−1 |
c = 24.6412 (4) Å | T = 150 K |
V = 1882.35 (6) Å3 | Plate, brown |
Z = 4 | 0.40 × 0.21 × 0.04 mm |
Bruker APEX Duo CCD area-detector diffractometer | 3145 independent reflections |
Radiation source: sealed tube | 3099 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.017 |
φ and ω scans | θmax = 64.9°, θmin = 6.1° |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | h = −5→5 |
Tmin = 0.755, Tmax = 0.970 | k = −17→17 |
11768 measured reflections | l = −28→28 |
Refinement on F2 | Hydrogen site location: inferred from neighbouring sites |
Least-squares matrix: full | All H-atom parameters refined |
R[F2 > 2σ(F2)] = 0.025 | w = 1/[σ2(Fo2) + (0.0452P)2 + 0.1806P] where P = (Fo2 + 2Fc2)/3 |
wR(F2) = 0.068 | (Δ/σ)max < 0.001 |
S = 1.06 | Δρmax = 0.12 e Å−3 |
3145 reflections | Δρmin = −0.10 e Å−3 |
354 parameters | Extinction correction: SHELXTL (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
0 restraints | Extinction coefficient: 0.0020 (7) |
Primary atom site location: structure-invariant direct methods | Absolute structure: Flack (1983), 1280 Friedel pairs |
Secondary atom site location: difference Fourier map | Absolute structure parameter: 0.05 (13) |
C23H25NO4 | V = 1882.35 (6) Å3 |
Mr = 379.44 | Z = 4 |
Orthorhombic, P212121 | Cu Kα radiation |
a = 5.0838 (1) Å | µ = 0.74 mm−1 |
b = 15.0262 (3) Å | T = 150 K |
c = 24.6412 (4) Å | 0.40 × 0.21 × 0.04 mm |
Bruker APEX Duo CCD area-detector diffractometer | 3145 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | 3099 reflections with I > 2σ(I) |
Tmin = 0.755, Tmax = 0.970 | Rint = 0.017 |
11768 measured reflections |
R[F2 > 2σ(F2)] = 0.025 | All H-atom parameters refined |
wR(F2) = 0.068 | Δρmax = 0.12 e Å−3 |
S = 1.06 | Δρmin = −0.10 e Å−3 |
3145 reflections | Absolute structure: Flack (1983), 1280 Friedel pairs |
354 parameters | Absolute structure parameter: 0.05 (13) |
0 restraints |
Experimental. The crystal was placed in the cold stream of an Oxford Cryosystems Cobra open-flow nitrogen cryostat (Cosier & Glazer, 1986) operating at 150.0 (1) K. |
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. |
x | y | z | Uiso*/Ueq | ||
O1 | 0.33887 (19) | 0.33672 (5) | 0.16257 (4) | 0.0319 (2) | |
H1O1 | 0.469 (4) | 0.3351 (12) | 0.1882 (7) | 0.049 (5)* | |
O2 | 0.72372 (18) | 0.37879 (5) | 0.22397 (3) | 0.0312 (2) | |
O3 | 0.90459 (19) | 0.77102 (5) | 0.22853 (3) | 0.0318 (2) | |
H1O3 | 0.997 (4) | 0.8077 (12) | 0.2462 (7) | 0.044 (4)* | |
O4 | −0.06425 (19) | 0.56721 (6) | 0.06026 (4) | 0.0361 (2) | |
H1O4 | −0.139 (5) | 0.5215 (14) | 0.0460 (8) | 0.063 (6)* | |
N1 | 0.6200 (2) | 0.63969 (6) | 0.18325 (4) | 0.0264 (2) | |
H1N1 | 0.606 (4) | 0.6957 (12) | 0.1732 (6) | 0.038 (4)* | |
C1 | 0.1336 (2) | 0.44827 (8) | 0.11088 (5) | 0.0273 (3) | |
C2 | 0.3211 (2) | 0.42334 (8) | 0.14856 (5) | 0.0261 (3) | |
C3 | 0.4921 (2) | 0.48690 (7) | 0.17304 (4) | 0.0251 (3) | |
C4 | 0.6888 (2) | 0.46022 (8) | 0.21176 (5) | 0.0262 (3) | |
C5 | 0.8448 (3) | 0.52966 (8) | 0.23719 (5) | 0.0269 (3) | |
C6 | 1.0361 (3) | 0.50956 (8) | 0.27663 (5) | 0.0331 (3) | |
H6A | 1.074 (3) | 0.4477 (10) | 0.2852 (6) | 0.030 (3)* | |
C7 | 1.1787 (3) | 0.57660 (9) | 0.29998 (6) | 0.0381 (3) | |
H7A | 1.318 (4) | 0.5600 (11) | 0.3267 (7) | 0.045 (4)* | |
C8 | 1.1372 (3) | 0.66535 (9) | 0.28512 (5) | 0.0343 (3) | |
H8A | 1.240 (4) | 0.7140 (12) | 0.3021 (7) | 0.057 (5)* | |
C9 | 0.9535 (3) | 0.68681 (8) | 0.24628 (5) | 0.0281 (3) | |
C10 | 0.8034 (2) | 0.61840 (8) | 0.22173 (5) | 0.0259 (3) | |
C11 | 0.4625 (2) | 0.57783 (7) | 0.15855 (5) | 0.0255 (2) | |
C12 | 0.2744 (2) | 0.60509 (8) | 0.12029 (5) | 0.0274 (3) | |
C13 | 0.1178 (2) | 0.53936 (8) | 0.09727 (5) | 0.0277 (3) | |
C14 | 0.2289 (3) | 0.70240 (8) | 0.10748 (6) | 0.0319 (3) | |
H14A | 0.081 (4) | 0.7041 (11) | 0.0827 (7) | 0.049 (5)* | |
H14B | 0.184 (3) | 0.7325 (11) | 0.1402 (7) | 0.040 (4)* | |
C15 | 0.4574 (3) | 0.74968 (8) | 0.08153 (5) | 0.0313 (3) | |
H15A | 0.544 (3) | 0.7170 (10) | 0.0517 (6) | 0.041 (4)* | |
C16 | 0.5452 (3) | 0.83055 (8) | 0.09368 (5) | 0.0346 (3) | |
C17 | 0.7648 (4) | 0.87331 (12) | 0.06276 (8) | 0.0536 (4) | |
H17A | 0.917 (5) | 0.8886 (16) | 0.0890 (10) | 0.087 (7)* | |
H17B | 0.829 (4) | 0.8328 (14) | 0.0332 (8) | 0.065 (6)* | |
H17C | 0.715 (4) | 0.9270 (13) | 0.0451 (7) | 0.053 (5)* | |
C18 | 0.4364 (4) | 0.88686 (9) | 0.13869 (7) | 0.0469 (4) | |
H18A | 0.281 (5) | 0.8592 (14) | 0.1596 (9) | 0.071 (6)* | |
H18B | 0.563 (6) | 0.8967 (17) | 0.1648 (10) | 0.096 (8)* | |
H18C | 0.371 (4) | 0.9448 (14) | 0.1242 (8) | 0.063 (5)* | |
C19 | −0.0548 (3) | 0.38053 (8) | 0.08652 (5) | 0.0301 (3) | |
H19A | −0.048 (3) | 0.3304 (11) | 0.1104 (6) | 0.039 (4)* | |
H19B | −0.240 (4) | 0.4055 (10) | 0.0883 (6) | 0.042 (4)* | |
C20 | 0.0167 (3) | 0.35223 (7) | 0.02981 (5) | 0.0312 (3) | |
H20A | 0.179 (3) | 0.3171 (10) | 0.0264 (6) | 0.037 (4)* | |
C21 | −0.1104 (3) | 0.37003 (8) | −0.01615 (5) | 0.0351 (3) | |
C22 | −0.0091 (4) | 0.33621 (11) | −0.06969 (6) | 0.0509 (4) | |
H22A | −0.149 (5) | 0.3035 (14) | −0.0897 (8) | 0.069 (6)* | |
H22B | 0.043 (4) | 0.3915 (13) | −0.0939 (8) | 0.061 (5)* | |
H22C | 0.179 (5) | 0.2984 (15) | −0.0653 (9) | 0.080 (7)* | |
C23 | −0.3525 (3) | 0.42646 (13) | −0.02079 (7) | 0.0520 (4) | |
H23A | −0.490 (5) | 0.3962 (16) | −0.0444 (9) | 0.083 (7)* | |
H23B | −0.312 (6) | 0.4882 (19) | −0.0386 (10) | 0.099 (8)* | |
H23C | −0.438 (4) | 0.4365 (11) | 0.0152 (8) | 0.050 (5)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0368 (5) | 0.0218 (4) | 0.0370 (5) | −0.0033 (3) | −0.0036 (4) | −0.0006 (3) |
O2 | 0.0342 (5) | 0.0199 (4) | 0.0395 (5) | 0.0001 (4) | −0.0059 (4) | 0.0012 (3) |
O3 | 0.0387 (5) | 0.0210 (4) | 0.0357 (4) | −0.0020 (4) | −0.0080 (4) | −0.0015 (3) |
O4 | 0.0340 (5) | 0.0337 (5) | 0.0406 (5) | −0.0034 (4) | −0.0116 (4) | 0.0020 (4) |
N1 | 0.0280 (5) | 0.0194 (5) | 0.0318 (5) | −0.0012 (4) | −0.0023 (4) | −0.0003 (4) |
C1 | 0.0269 (6) | 0.0283 (6) | 0.0266 (5) | −0.0036 (5) | 0.0034 (5) | −0.0033 (4) |
C2 | 0.0280 (6) | 0.0228 (5) | 0.0275 (5) | −0.0009 (5) | 0.0051 (5) | −0.0020 (4) |
C3 | 0.0253 (6) | 0.0234 (5) | 0.0266 (5) | −0.0007 (5) | 0.0032 (5) | −0.0022 (4) |
C4 | 0.0271 (6) | 0.0234 (5) | 0.0280 (5) | 0.0009 (4) | 0.0023 (5) | −0.0008 (4) |
C5 | 0.0286 (6) | 0.0229 (6) | 0.0290 (6) | −0.0007 (5) | 0.0010 (5) | −0.0014 (4) |
C6 | 0.0396 (7) | 0.0238 (6) | 0.0358 (6) | 0.0027 (5) | −0.0084 (6) | 0.0009 (5) |
C7 | 0.0438 (8) | 0.0299 (6) | 0.0405 (7) | −0.0008 (6) | −0.0164 (6) | −0.0005 (5) |
C8 | 0.0402 (7) | 0.0271 (6) | 0.0356 (7) | −0.0038 (5) | −0.0096 (6) | −0.0039 (5) |
C9 | 0.0324 (7) | 0.0222 (5) | 0.0298 (6) | −0.0015 (5) | 0.0004 (5) | −0.0027 (4) |
C10 | 0.0261 (6) | 0.0254 (6) | 0.0263 (6) | 0.0013 (5) | 0.0012 (5) | −0.0011 (4) |
C11 | 0.0245 (6) | 0.0234 (5) | 0.0285 (6) | −0.0012 (5) | 0.0028 (5) | −0.0016 (4) |
C12 | 0.0254 (6) | 0.0261 (6) | 0.0306 (6) | 0.0000 (5) | 0.0001 (5) | −0.0003 (5) |
C13 | 0.0255 (6) | 0.0295 (6) | 0.0281 (5) | −0.0004 (5) | 0.0012 (5) | 0.0012 (5) |
C14 | 0.0286 (7) | 0.0269 (6) | 0.0403 (7) | 0.0007 (5) | −0.0047 (6) | 0.0011 (5) |
C15 | 0.0329 (7) | 0.0300 (6) | 0.0310 (6) | 0.0029 (6) | −0.0039 (5) | 0.0032 (5) |
C16 | 0.0325 (7) | 0.0297 (6) | 0.0414 (7) | −0.0017 (5) | −0.0116 (6) | 0.0106 (5) |
C17 | 0.0408 (8) | 0.0440 (8) | 0.0759 (12) | −0.0058 (7) | −0.0023 (8) | 0.0237 (8) |
C18 | 0.0621 (10) | 0.0288 (6) | 0.0497 (8) | −0.0040 (7) | −0.0127 (8) | −0.0037 (6) |
C19 | 0.0311 (7) | 0.0291 (6) | 0.0300 (6) | −0.0058 (6) | −0.0005 (5) | −0.0009 (5) |
C20 | 0.0338 (7) | 0.0245 (5) | 0.0353 (6) | −0.0031 (5) | 0.0022 (5) | −0.0027 (5) |
C21 | 0.0413 (7) | 0.0318 (6) | 0.0323 (6) | −0.0113 (6) | −0.0007 (6) | −0.0002 (5) |
C22 | 0.0705 (11) | 0.0481 (8) | 0.0341 (7) | −0.0124 (8) | 0.0028 (7) | −0.0042 (6) |
C23 | 0.0417 (8) | 0.0680 (11) | 0.0465 (9) | 0.0000 (8) | −0.0128 (7) | −0.0005 (8) |
O1—C2 | 1.3497 (15) | C12—C14 | 1.5137 (16) |
O1—H1O1 | 0.92 (2) | C14—C15 | 1.5045 (18) |
O2—C4 | 1.2725 (14) | C14—H14A | 0.97 (2) |
O3—C9 | 1.3617 (14) | C14—H14B | 0.954 (16) |
O3—H1O3 | 0.845 (19) | C15—C16 | 1.3285 (18) |
O4—C13 | 1.3651 (15) | C15—H15A | 0.986 (16) |
O4—H1O4 | 0.86 (2) | C16—C17 | 1.497 (2) |
N1—C10 | 1.3679 (16) | C16—C18 | 1.501 (2) |
N1—C11 | 1.3695 (15) | C17—H17A | 1.03 (3) |
N1—H1N1 | 0.880 (17) | C17—H17B | 1.00 (2) |
C1—C2 | 1.3825 (18) | C17—H17C | 0.95 (2) |
C1—C13 | 1.4114 (17) | C18—H18A | 1.03 (2) |
C1—C19 | 1.5209 (16) | C18—H18B | 0.92 (3) |
C2—C3 | 1.4254 (16) | C18—H18C | 1.00 (2) |
C3—C11 | 1.4203 (16) | C19—C20 | 1.5051 (17) |
C3—C4 | 1.4393 (17) | C19—H19A | 0.957 (16) |
C4—C5 | 1.4525 (16) | C19—H19B | 1.015 (19) |
C5—C10 | 1.4026 (17) | C20—C21 | 1.3311 (19) |
C5—C6 | 1.4078 (18) | C20—H20A | 0.982 (17) |
C6—C7 | 1.3679 (19) | C21—C23 | 1.499 (2) |
C6—H6A | 0.973 (15) | C21—C22 | 1.505 (2) |
C7—C8 | 1.3990 (19) | C22—H22A | 0.99 (2) |
C7—H7A | 0.997 (18) | C22—H22B | 1.06 (2) |
C8—C9 | 1.3754 (18) | C22—H22C | 1.12 (3) |
C8—H8A | 0.99 (2) | C23—H23A | 1.02 (3) |
C9—C10 | 1.4159 (17) | C23—H23B | 1.05 (3) |
C11—C12 | 1.4041 (17) | C23—H23C | 0.999 (19) |
C12—C13 | 1.3895 (17) | ||
C2—O1—H1O1 | 104.5 (11) | C12—C14—H14A | 106.0 (10) |
C9—O3—H1O3 | 109.9 (12) | C15—C14—H14B | 108.8 (10) |
C13—O4—H1O4 | 109.2 (14) | C12—C14—H14B | 108.6 (10) |
C10—N1—C11 | 123.22 (10) | H14A—C14—H14B | 109.5 (14) |
C10—N1—H1N1 | 118.3 (11) | C16—C15—C14 | 126.55 (13) |
C11—N1—H1N1 | 118.5 (11) | C16—C15—H15A | 118.3 (10) |
C2—C1—C13 | 117.48 (11) | C14—C15—H15A | 115.1 (9) |
C2—C1—C19 | 121.19 (11) | C15—C16—C17 | 121.91 (15) |
C13—C1—C19 | 121.29 (11) | C15—C16—C18 | 123.95 (13) |
O1—C2—C1 | 118.64 (10) | C17—C16—C18 | 114.14 (14) |
O1—C2—C3 | 119.81 (11) | C16—C17—H17A | 109.5 (14) |
C1—C2—C3 | 121.55 (11) | C16—C17—H17B | 110.5 (12) |
C11—C3—C2 | 118.26 (10) | H17A—C17—H17B | 110.4 (19) |
C11—C3—C4 | 120.55 (10) | C16—C17—H17C | 113.6 (12) |
C2—C3—C4 | 121.18 (10) | H17A—C17—H17C | 107.3 (17) |
O2—C4—C3 | 121.43 (11) | H17B—C17—H17C | 105.5 (16) |
O2—C4—C5 | 120.84 (11) | C16—C18—H18A | 115.1 (12) |
C3—C4—C5 | 117.72 (10) | C16—C18—H18B | 110.4 (17) |
C10—C5—C6 | 119.67 (11) | H18A—C18—H18B | 104.6 (18) |
C10—C5—C4 | 118.94 (11) | C16—C18—H18C | 110.5 (11) |
C6—C5—C4 | 121.39 (11) | H18A—C18—H18C | 105.9 (17) |
C7—C6—C5 | 119.90 (12) | H18B—C18—H18C | 110 (2) |
C7—C6—H6A | 120.5 (9) | C20—C19—C1 | 113.79 (10) |
C5—C6—H6A | 119.5 (9) | C20—C19—H19A | 109.9 (9) |
C6—C7—C8 | 120.79 (12) | C1—C19—H19A | 105.1 (10) |
C6—C7—H7A | 118.0 (10) | C20—C19—H19B | 111.7 (9) |
C8—C7—H7A | 121.2 (10) | C1—C19—H19B | 108.6 (9) |
C9—C8—C7 | 120.54 (12) | H19A—C19—H19B | 107.4 (14) |
C9—C8—H8A | 118.7 (11) | C21—C20—C19 | 128.01 (13) |
C7—C8—H8A | 120.8 (11) | C21—C20—H20A | 116.2 (9) |
O3—C9—C8 | 124.42 (11) | C19—C20—H20A | 115.8 (9) |
O3—C9—C10 | 116.04 (11) | C20—C21—C23 | 125.26 (13) |
C8—C9—C10 | 119.53 (11) | C20—C21—C22 | 120.79 (14) |
N1—C10—C5 | 120.86 (11) | C23—C21—C22 | 113.91 (14) |
N1—C10—C9 | 119.58 (11) | C21—C22—H22A | 110.9 (12) |
C5—C10—C9 | 119.56 (11) | C21—C22—H22B | 108.4 (10) |
N1—C11—C12 | 119.91 (10) | H22A—C22—H22B | 106.7 (15) |
N1—C11—C3 | 118.64 (11) | C21—C22—H22C | 112.3 (11) |
C12—C11—C3 | 121.44 (10) | H22A—C22—H22C | 114.1 (16) |
C13—C12—C11 | 117.19 (11) | H22B—C22—H22C | 103.9 (16) |
C13—C12—C14 | 120.93 (11) | C21—C23—H23A | 110.8 (14) |
C11—C12—C14 | 121.73 (11) | C21—C23—H23B | 111.8 (17) |
O4—C13—C12 | 116.30 (11) | H23A—C23—H23B | 107 (2) |
O4—C13—C1 | 119.64 (11) | C21—C23—H23C | 112.1 (11) |
C12—C13—C1 | 124.04 (11) | H23A—C23—H23C | 106.0 (17) |
C15—C14—C12 | 115.26 (11) | H23B—C23—H23C | 108.9 (17) |
C15—C14—H14A | 108.6 (10) | ||
C13—C1—C2—O1 | 179.51 (10) | O3—C9—C10—C5 | 179.04 (11) |
C19—C1—C2—O1 | 1.60 (17) | C8—C9—C10—C5 | −0.24 (18) |
C13—C1—C2—C3 | 0.19 (17) | C10—N1—C11—C12 | 178.53 (10) |
C19—C1—C2—C3 | −177.72 (10) | C10—N1—C11—C3 | −0.68 (17) |
O1—C2—C3—C11 | −178.11 (10) | C2—C3—C11—N1 | 177.81 (10) |
C1—C2—C3—C11 | 1.20 (17) | C4—C3—C11—N1 | −1.72 (16) |
O1—C2—C3—C4 | 1.42 (16) | C2—C3—C11—C12 | −1.39 (16) |
C1—C2—C3—C4 | −179.27 (11) | C4—C3—C11—C12 | 179.08 (11) |
C11—C3—C4—O2 | −177.79 (11) | N1—C11—C12—C13 | −179.03 (11) |
C2—C3—C4—O2 | 2.69 (17) | C3—C11—C12—C13 | 0.16 (17) |
C11—C3—C4—C5 | 3.05 (16) | N1—C11—C12—C14 | −3.44 (17) |
C2—C3—C4—C5 | −176.47 (10) | C3—C11—C12—C14 | 175.74 (11) |
O2—C4—C5—C10 | 178.75 (11) | C11—C12—C13—O4 | 179.87 (10) |
C3—C4—C5—C10 | −2.09 (16) | C14—C12—C13—O4 | 4.25 (17) |
O2—C4—C5—C6 | −1.00 (18) | C11—C12—C13—C1 | 1.35 (18) |
C3—C4—C5—C6 | 178.17 (12) | C14—C12—C13—C1 | −174.27 (11) |
C10—C5—C6—C7 | 0.6 (2) | C2—C1—C13—O4 | 180.00 (10) |
C4—C5—C6—C7 | −179.67 (12) | C19—C1—C13—O4 | −2.10 (17) |
C5—C6—C7—C8 | −0.1 (2) | C2—C1—C13—C12 | −1.53 (18) |
C6—C7—C8—C9 | −0.6 (2) | C19—C1—C13—C12 | 176.37 (11) |
C7—C8—C9—O3 | −178.45 (13) | C13—C12—C14—C15 | −119.77 (13) |
C7—C8—C9—C10 | 0.8 (2) | C11—C12—C14—C15 | 64.81 (16) |
C11—N1—C10—C5 | 1.65 (17) | C12—C14—C15—C16 | −136.97 (13) |
C11—N1—C10—C9 | −178.35 (11) | C14—C15—C16—C17 | −176.18 (13) |
C6—C5—C10—N1 | 179.57 (11) | C14—C15—C16—C18 | 3.8 (2) |
C4—C5—C10—N1 | −0.18 (17) | C2—C1—C19—C20 | −102.65 (13) |
C6—C5—C10—C9 | −0.43 (18) | C13—C1—C19—C20 | 79.52 (15) |
C4—C5—C10—C9 | 179.82 (11) | C1—C19—C20—C21 | −111.01 (15) |
O3—C9—C10—N1 | −0.96 (16) | C19—C20—C21—C23 | 2.4 (2) |
C8—C9—C10—N1 | 179.75 (11) | C19—C20—C21—C22 | 179.80 (13) |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1O1···O2 | 0.915 (19) | 1.699 (19) | 2.5528 (13) | 154.1 (17) |
O3—H1O3···O2i | 0.845 (19) | 1.923 (19) | 2.7501 (12) | 165.9 (19) |
N1—H1N1···O3 | 0.880 (18) | 2.333 (18) | 2.6893 (13) | 104.3 (13) |
C8—H8A···O2i | 0.991 (19) | 2.565 (18) | 3.2918 (16) | 130.1 (13) |
C14—H14A···O4 | 0.969 (19) | 2.254 (17) | 2.7752 (16) | 112.6 (12) |
C19—H19A···O1 | 0.957 (16) | 2.352 (15) | 2.8197 (17) | 109.6 (11) |
Symmetry code: (i) −x+2, y+1/2, −z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C23H25NO4 |
Mr | 379.44 |
Crystal system, space group | Orthorhombic, P212121 |
Temperature (K) | 150 |
a, b, c (Å) | 5.0838 (1), 15.0262 (3), 24.6412 (4) |
V (Å3) | 1882.35 (6) |
Z | 4 |
Radiation type | Cu Kα |
µ (mm−1) | 0.74 |
Crystal size (mm) | 0.40 × 0.21 × 0.04 |
Data collection | |
Diffractometer | Bruker APEX Duo CCD area-detector |
Absorption correction | Multi-scan (SADABS; Bruker, 2009) |
Tmin, Tmax | 0.755, 0.970 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 11768, 3145, 3099 |
Rint | 0.017 |
(sin θ/λ)max (Å−1) | 0.587 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.025, 0.068, 1.06 |
No. of reflections | 3145 |
No. of parameters | 354 |
H-atom treatment | All H-atom parameters refined |
Δρmax, Δρmin (e Å−3) | 0.12, −0.10 |
Absolute structure | Flack (1983), 1280 Friedel pairs |
Absolute structure parameter | 0.05 (13) |
Computer programs: APEX2 (Bruker, 2009), SAINT (Bruker, 2009), SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1O1···O2 | 0.915 (19) | 1.699 (19) | 2.5528 (13) | 154.1 (17) |
O3—H1O3···O2i | 0.845 (19) | 1.923 (19) | 2.7501 (12) | 165.9 (19) |
N1—H1N1···O3 | 0.880 (18) | 2.333 (18) | 2.6893 (13) | 104.3 (13) |
C8—H8A···O2i | 0.991 (19) | 2.565 (18) | 3.2918 (16) | 130.1 (13) |
C14—H14A···O4 | 0.969 (19) | 2.254 (17) | 2.7752 (16) | 112.6 (12) |
C19—H19A···O1 | 0.957 (16) | 2.352 (15) | 2.8197 (17) | 109.6 (11) |
Symmetry code: (i) −x+2, y+1/2, −z+1/2. |
Acknowledgements
The authors thank the Malaysian Government and the Universiti Sains Malaysia for the Research University Golden Goose grant No. 1001/PFIZIK/811012. Mr Nawong Boonnak is acknowledged for supplying the atalaphylline crystal. CSY thanks USM for the award of a USM Fellowship. SC thanks Prince of Songkla University for financial support through the Crystal Materials Research Unit.
References
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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.
The title acridone alkaloid (I) known as atalaphylline (Basu & Basa, 1972), was isolated from the roots of Atalantia monophylla Corrêa, a mangrove plant which was collected from Trang province in the southern part of Thailand. Although (I) has been previously reported (Chantrapromma et al., 2010), the absolute configuration could not be determined due to insufficient anomalous dispersion from the light atoms using the data set collected with Mo radiation. The data of the same sample was recollected using Cu radiation with our newly-installed Bruker Apex-Duo CCD diffractometer and the absolute configulation was determined by making use of the large anomalous scattering of Cu Kα X-radiation with the Flack parameter being refined to 0.05 (13). We report herein the crystal structure of (I) with data collected using Cu radiation.
Fig. 1 shows the molecular structure of (I), bond lengths and angles are closely similar to those previously described (Chantrapromma et al., 2010). (I) is chiral even though it has no chiral center because its mirror image cannot be superposed onto itself. This is due to the arrangements of the two 3-methylbut-2-enyl side-chains at atoms C1 and C12. (I) crystallized as a single enantiomer in chiral orthorhombic P212121 space group. The current structure determination represents a significant improvement compared with the structure determined from the data taken with Mo radiation and it confirmed the absolute conformation of the side-chains for (I). To be precise the two 3-methyl-2-enyl groups at C1 and C12 are attached in such a way that these two side-chains are below the acridone molecular plane indicating the (-)-anticlinal conformation with the torsion angles C2–C1–C19–C20 and C13–C12–C14–C15 are -102.65 (13) and -119.77 (33)°, respectively.
Fig. 2 shows the crystal packing of (I). Intermolecular O—H···O hydrogen bonds and weak C—H···O interactions (Table 1) linked the molecules into infinite one dimensional screw-chains along the [0 1 0] direction. These features are similar to those of the previous report by Chantrapromma et al. (2010) except there is an additional weak intermolecular C—H···O interaction and a π–π interaction with a Cg1···Cg2 distance of 3.7643 (7) Å (symmetry code: -1+x, y, z); Cg1 and Cg2 are the centroids of C3–C5/C10–C11/N1 and C5–C10 rings, respectively . These differences are due to the fact that all the hydrogen atoms are refined freely whereas in previous report by Chantrapromma et al. (2010), the hydrogen atoms were positioned geometrically and allowed to ride on their parent atoms.