organic compounds
2,4-Bis(3-methoxyphenyl)-3-azabicyclo[3.3.1]nonan-9-one
aDivision of Image Science and Information Engineering, Pukyong National University, Busan 608 739, Republic of Korea, and bDepartment of Chemistry, IIT Madras, Chennai, TamilNadu, India
*Correspondence e-mail: ytjeong@pknu.ac.kr
In the 22H25NO3, exists in a twin-chair conformation with equatorial orientations of the meta-methoxyphenyl groups on both sides of the secondary amino group. The title compound is a positional isomer of 2,4-bis(2-methoxyphenyl)-3-azabicyclo[3.3.1]nonan-9-one and 2,4-bis(4-methoxyphenyl)-3-azabicyclo[3.3.1]nonan-9-one, which both also exhibit twin-chair conformations with equatorial dispositions of the anisyl rings on both sides of the secondary amino group. In the title compound, the meta-methoxyphenyl rings are orientated at an angle of 25.02 (3)° with respect to each other, whereas in the ortho and para isomers, the anisyl rings are orientated at dihedral angles of 33.86 (3) and 37.43 (4)°, respectively. The crystal packing is dominated by van der Waals interactions and by an intermolecular N—H⋯O hydrogen bond, whereas in the ortho isomer, an intermolecular N—H⋯π interaction (H⋯Cg = 2.75 Å) is found.
the title compound, CRelated literature
For the synthesis and biological activity of 3-azabicyclo[3.3.1]nonan-9-ones, see: Jeyaraman & Avila (1981). For the nicotinic acetylcholine receptor antogonistic activity of diterpenoid/norditerpenoid see: Hardick et al. (1996); Barker et al. (2005). For the structures of the ortho and para OMe-substitued isomers, see: Parthiban et al. (2009a); Cox et al. (1985). For related structures, see: Parthiban et al. (2008a,b,c, 2009b,c), Smith-Verdier et al. (1983); Padegimas & Kovacic (1972). For ring puckering analysis, see: Cremer & Pople (1975); Nardelli (1983).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2004); cell APEX2 and SAINT-Plus (Bruker, 2004); data reduction: SAINT-Plus and XPREP (Bruker, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: SHELXL97.
Supporting information
10.1107/S1600536809050697/zl2238sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536809050697/zl2238Isup2.hkl
The title compound was synthesized by a modified Mannich reaction using 0.1 mol (13.61 g/12.18 ml) meta-methoxybenzaldehyde, 0.05 mol (4.90 g/5.18 ml) cyclohexanone and 0.075 mol (5.78 g) ammonium acetate in 50 ml of absolute ethanol. The mixture was gently warmed on a hot plate with medium stirring and stirring was continued for about 15 h at a temperature of 303–308 K (30–35° C). After 12 h, the product formed was a spongy solid which was stirred for an additional 3 h until the reaction was complete as confirmed by the absence of aldehyde and cyclohexanone in the reaction mixture by TLC. After this, the crude compound was separated by filtration and washed with a 1:5 ethanol-ether mixture. X-ray diffraction quality crystals of 2,4-bis(3-methoxyphenyl)-3-azabicyclo[3.3.1]nonan-9-one were obtained by slow evaporation from ethanol.
The nitrogen H atom was located in a difference Fourier map and refined isotropically. Other hydrogen atoms were fixed geometrically and allowed to ride on the parent carbon atoms with aromatic C-H = 0.93 Å, aliphatic C-H = 0.98 Å, methylene C-H = 0.97 Å and methyl C-H = 0.96 Å. The displacement parameters were set for phenyl, methylene and aliphatic H atoms at Uiso(H) = 1.2Ueq(C) and for methyl H atoms at Uiso(H) = 1.5Ueq(C)
Data collection: APEX2 (Bruker, 2004); cell
APEX2 and SAINT-Plus (Bruker, 2004); data reduction: SAINT-Plus and XPREP (Bruker, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).C22H25NO3 | F(000) = 752 |
Mr = 351.43 | Dx = 1.266 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 2453 reflections |
a = 22.3843 (9) Å | θ = 2.9–22.7° |
b = 6.5666 (3) Å | µ = 0.08 mm−1 |
c = 13.0745 (4) Å | T = 298 K |
β = 106.382 (2)° | Block, colourless |
V = 1843.78 (13) Å3 | 0.40 × 0.28 × 0.15 mm |
Z = 4 |
Bruker APEXII CCD area-detector diffractometer | 3971 independent reflections |
Radiation source: fine-focus sealed tube | 2326 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.037 |
phi and ω scans | θmax = 28.3°, θmin = 2.9° |
Absorption correction: multi-scan (SADABS; Bruker, 1999) | h = −27→28 |
Tmin = 0.967, Tmax = 0.988 | k = −7→8 |
12835 measured reflections | l = −12→17 |
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)] = 0.049 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.136 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.06 | w = 1/[σ2(Fo2) + (0.0643P)2] where P = (Fo2 + 2Fc2)/3 |
3971 reflections | (Δ/σ)max < 0.001 |
241 parameters | Δρmax = 0.30 e Å−3 |
0 restraints | Δρmin = −0.23 e Å−3 |
C22H25NO3 | V = 1843.78 (13) Å3 |
Mr = 351.43 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 22.3843 (9) Å | µ = 0.08 mm−1 |
b = 6.5666 (3) Å | T = 298 K |
c = 13.0745 (4) Å | 0.40 × 0.28 × 0.15 mm |
β = 106.382 (2)° |
Bruker APEXII CCD area-detector diffractometer | 3971 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 1999) | 2326 reflections with I > 2σ(I) |
Tmin = 0.967, Tmax = 0.988 | Rint = 0.037 |
12835 measured reflections |
R[F2 > 2σ(F2)] = 0.049 | 0 restraints |
wR(F2) = 0.136 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.06 | Δρmax = 0.30 e Å−3 |
3971 reflections | Δρmin = −0.23 e Å−3 |
241 parameters |
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 | ||
C1 | 0.32467 (7) | 0.5186 (3) | 0.49436 (13) | 0.0356 (4) | |
H1 | 0.3471 | 0.6483 | 0.5098 | 0.043* | |
C2 | 0.30802 (8) | 0.4800 (3) | 0.37207 (13) | 0.0388 (5) | |
H2 | 0.3464 | 0.4857 | 0.3502 | 0.047* | |
C3 | 0.27531 (9) | 0.2775 (3) | 0.33443 (15) | 0.0479 (5) | |
H3A | 0.2724 | 0.2589 | 0.2596 | 0.057* | |
H3B | 0.3005 | 0.1674 | 0.3737 | 0.057* | |
C4 | 0.21054 (10) | 0.2635 (3) | 0.34870 (16) | 0.0573 (6) | |
H4A | 0.1892 | 0.1478 | 0.3085 | 0.069* | |
H4B | 0.2141 | 0.2393 | 0.4234 | 0.069* | |
C5 | 0.17173 (9) | 0.4527 (3) | 0.31292 (15) | 0.0484 (5) | |
H5A | 0.1356 | 0.4469 | 0.3398 | 0.058* | |
H5B | 0.1569 | 0.4529 | 0.2357 | 0.058* | |
C6 | 0.20648 (8) | 0.6525 (3) | 0.34984 (13) | 0.0398 (4) | |
H6 | 0.1807 | 0.7660 | 0.3133 | 0.048* | |
C7 | 0.22453 (7) | 0.6922 (3) | 0.47199 (13) | 0.0376 (4) | |
H7 | 0.2460 | 0.8237 | 0.4860 | 0.045* | |
C8 | 0.26600 (8) | 0.6491 (3) | 0.31776 (13) | 0.0382 (4) | |
C9 | 0.36693 (7) | 0.3516 (3) | 0.55456 (12) | 0.0351 (4) | |
C10 | 0.34445 (8) | 0.1866 (3) | 0.59844 (13) | 0.0430 (5) | |
H10 | 0.3024 | 0.1796 | 0.5947 | 0.052* | |
C11 | 0.38393 (9) | 0.0330 (3) | 0.64743 (15) | 0.0495 (5) | |
H11 | 0.3682 | −0.0761 | 0.6771 | 0.059* | |
C12 | 0.44674 (9) | 0.0379 (3) | 0.65342 (14) | 0.0489 (5) | |
H12 | 0.4732 | −0.0664 | 0.6869 | 0.059* | |
C13 | 0.46919 (8) | 0.2005 (3) | 0.60884 (14) | 0.0419 (5) | |
C14 | 0.42955 (8) | 0.3570 (3) | 0.56051 (13) | 0.0386 (4) | |
H14 | 0.4453 | 0.4671 | 0.5317 | 0.046* | |
C15 | 0.16734 (8) | 0.7034 (3) | 0.51186 (13) | 0.0371 (4) | |
C16 | 0.13403 (8) | 0.8838 (3) | 0.50128 (15) | 0.0473 (5) | |
H16 | 0.1471 | 0.9958 | 0.4697 | 0.057* | |
C17 | 0.08192 (9) | 0.8993 (3) | 0.53688 (16) | 0.0532 (5) | |
H17 | 0.0604 | 1.0220 | 0.5296 | 0.064* | |
C18 | 0.06116 (8) | 0.7346 (3) | 0.58332 (15) | 0.0478 (5) | |
H18 | 0.0258 | 0.7451 | 0.6070 | 0.057* | |
C19 | 0.09401 (8) | 0.5548 (3) | 0.59381 (14) | 0.0409 (5) | |
C20 | 0.14652 (8) | 0.5399 (3) | 0.55826 (14) | 0.0403 (5) | |
H20 | 0.1681 | 0.4173 | 0.5658 | 0.048* | |
C21 | 0.57145 (9) | 0.0580 (3) | 0.65086 (19) | 0.0692 (7) | |
H21A | 0.5747 | 0.0431 | 0.7253 | 0.104* | |
H21B | 0.6118 | 0.0868 | 0.6423 | 0.104* | |
H21C | 0.5557 | −0.0659 | 0.6141 | 0.104* | |
C22 | 0.03130 (10) | 0.3935 (4) | 0.69181 (18) | 0.0737 (7) | |
H22A | 0.0429 | 0.4937 | 0.7474 | 0.111* | |
H22B | 0.0268 | 0.2633 | 0.7223 | 0.111* | |
H22C | −0.0075 | 0.4317 | 0.6421 | 0.111* | |
N1 | 0.26760 (6) | 0.5346 (2) | 0.52819 (12) | 0.0370 (4) | |
O1 | 0.27803 (6) | 0.7680 (2) | 0.25553 (10) | 0.0548 (4) | |
O2 | 0.53008 (6) | 0.2212 (2) | 0.60764 (11) | 0.0612 (4) | |
O3 | 0.07815 (6) | 0.3815 (2) | 0.63810 (11) | 0.0613 (4) | |
H1N | 0.2775 (8) | 0.558 (3) | 0.5980 (15) | 0.048 (6)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0318 (9) | 0.0366 (11) | 0.0398 (10) | 0.0004 (8) | 0.0123 (8) | −0.0011 (8) |
C2 | 0.0399 (10) | 0.0469 (12) | 0.0347 (10) | 0.0054 (9) | 0.0190 (8) | 0.0037 (8) |
C3 | 0.0630 (13) | 0.0441 (12) | 0.0381 (10) | 0.0039 (10) | 0.0168 (9) | −0.0040 (9) |
C4 | 0.0650 (14) | 0.0463 (13) | 0.0560 (13) | −0.0119 (11) | 0.0097 (11) | −0.0059 (10) |
C5 | 0.0440 (11) | 0.0584 (14) | 0.0405 (11) | −0.0084 (10) | 0.0083 (9) | −0.0056 (10) |
C6 | 0.0372 (10) | 0.0426 (11) | 0.0390 (10) | 0.0050 (8) | 0.0096 (8) | 0.0064 (9) |
C7 | 0.0341 (9) | 0.0372 (11) | 0.0428 (10) | 0.0001 (8) | 0.0128 (8) | −0.0016 (8) |
C8 | 0.0431 (10) | 0.0402 (11) | 0.0314 (9) | −0.0028 (9) | 0.0107 (8) | 0.0010 (9) |
C9 | 0.0369 (10) | 0.0408 (11) | 0.0293 (9) | 0.0022 (8) | 0.0120 (7) | −0.0016 (8) |
C10 | 0.0375 (10) | 0.0547 (13) | 0.0401 (10) | 0.0012 (9) | 0.0165 (8) | 0.0066 (9) |
C11 | 0.0554 (12) | 0.0529 (13) | 0.0456 (12) | 0.0049 (10) | 0.0229 (10) | 0.0154 (10) |
C12 | 0.0512 (12) | 0.0535 (13) | 0.0420 (11) | 0.0125 (10) | 0.0133 (9) | 0.0123 (10) |
C13 | 0.0333 (10) | 0.0524 (13) | 0.0400 (10) | 0.0034 (9) | 0.0101 (8) | −0.0009 (9) |
C14 | 0.0362 (10) | 0.0417 (11) | 0.0392 (10) | 0.0000 (8) | 0.0128 (8) | 0.0021 (9) |
C15 | 0.0339 (9) | 0.0407 (11) | 0.0357 (9) | 0.0034 (8) | 0.0081 (8) | −0.0037 (8) |
C16 | 0.0430 (11) | 0.0400 (12) | 0.0612 (13) | 0.0041 (9) | 0.0184 (9) | 0.0037 (10) |
C17 | 0.0451 (12) | 0.0464 (13) | 0.0692 (14) | 0.0152 (10) | 0.0177 (10) | 0.0001 (11) |
C18 | 0.0355 (10) | 0.0562 (14) | 0.0537 (12) | 0.0086 (10) | 0.0162 (9) | −0.0021 (10) |
C19 | 0.0383 (10) | 0.0435 (12) | 0.0414 (11) | 0.0041 (9) | 0.0121 (8) | 0.0005 (9) |
C20 | 0.0382 (10) | 0.0389 (11) | 0.0452 (11) | 0.0104 (8) | 0.0140 (8) | 0.0008 (9) |
C21 | 0.0418 (12) | 0.0740 (17) | 0.0868 (17) | 0.0182 (11) | 0.0098 (11) | 0.0064 (13) |
C22 | 0.0694 (15) | 0.0840 (19) | 0.0840 (17) | 0.0043 (13) | 0.0481 (14) | 0.0144 (14) |
N1 | 0.0325 (8) | 0.0488 (10) | 0.0313 (9) | 0.0070 (7) | 0.0114 (7) | −0.0019 (7) |
O1 | 0.0582 (9) | 0.0581 (10) | 0.0507 (8) | −0.0021 (7) | 0.0194 (7) | 0.0200 (7) |
O2 | 0.0350 (8) | 0.0656 (10) | 0.0832 (11) | 0.0114 (7) | 0.0167 (7) | 0.0151 (8) |
O3 | 0.0600 (9) | 0.0554 (10) | 0.0812 (10) | 0.0095 (7) | 0.0406 (8) | 0.0162 (8) |
C1—N1 | 1.469 (2) | C11—C12 | 1.386 (3) |
C1—C9 | 1.516 (2) | C11—H11 | 0.9300 |
C1—C2 | 1.557 (2) | C12—C13 | 1.378 (3) |
C1—H1 | 0.9800 | C12—H12 | 0.9300 |
C2—C8 | 1.498 (2) | C13—O2 | 1.374 (2) |
C2—C3 | 1.531 (2) | C13—C14 | 1.388 (2) |
C2—H2 | 0.9800 | C14—H14 | 0.9300 |
C3—C4 | 1.516 (3) | C15—C20 | 1.378 (2) |
C3—H3A | 0.9700 | C15—C16 | 1.385 (2) |
C3—H3B | 0.9700 | C16—C17 | 1.376 (2) |
C4—C5 | 1.512 (3) | C16—H16 | 0.9300 |
C4—H4A | 0.9700 | C17—C18 | 1.383 (3) |
C4—H4B | 0.9700 | C17—H17 | 0.9300 |
C5—C6 | 1.532 (2) | C18—C19 | 1.378 (2) |
C5—H5A | 0.9700 | C18—H18 | 0.9300 |
C5—H5B | 0.9700 | C19—O3 | 1.368 (2) |
C6—C8 | 1.506 (2) | C19—C20 | 1.384 (2) |
C6—C7 | 1.555 (2) | C20—H20 | 0.9300 |
C6—H6 | 0.9800 | C21—O2 | 1.425 (2) |
C7—N1 | 1.463 (2) | C21—H21A | 0.9600 |
C7—C15 | 1.514 (2) | C21—H21B | 0.9600 |
C7—H7 | 0.9800 | C21—H21C | 0.9600 |
C8—O1 | 1.2119 (19) | C22—O3 | 1.419 (2) |
C9—C14 | 1.382 (2) | C22—H22A | 0.9600 |
C9—C10 | 1.386 (2) | C22—H22B | 0.9600 |
C10—C11 | 1.374 (2) | C22—H22C | 0.9600 |
C10—H10 | 0.9300 | N1—H1N | 0.890 (18) |
N1—C1—C9 | 111.34 (13) | C11—C10—H10 | 119.8 |
N1—C1—C2 | 110.15 (13) | C9—C10—H10 | 119.8 |
C9—C1—C2 | 110.43 (13) | C10—C11—C12 | 121.21 (18) |
N1—C1—H1 | 108.3 | C10—C11—H11 | 119.4 |
C9—C1—H1 | 108.3 | C12—C11—H11 | 119.4 |
C2—C1—H1 | 108.3 | C13—C12—C11 | 118.63 (18) |
C8—C2—C3 | 108.17 (15) | C13—C12—H12 | 120.7 |
C8—C2—C1 | 107.60 (13) | C11—C12—H12 | 120.7 |
C3—C2—C1 | 115.21 (14) | O2—C13—C12 | 124.24 (17) |
C8—C2—H2 | 108.6 | O2—C13—C14 | 115.51 (16) |
C3—C2—H2 | 108.6 | C12—C13—C14 | 120.25 (16) |
C1—C2—H2 | 108.6 | C9—C14—C13 | 120.99 (17) |
C4—C3—C2 | 113.59 (15) | C9—C14—H14 | 119.5 |
C4—C3—H3A | 108.8 | C13—C14—H14 | 119.5 |
C2—C3—H3A | 108.8 | C20—C15—C16 | 118.10 (16) |
C4—C3—H3B | 108.8 | C20—C15—C7 | 122.51 (16) |
C2—C3—H3B | 108.8 | C16—C15—C7 | 119.40 (16) |
H3A—C3—H3B | 107.7 | C17—C16—C15 | 120.87 (18) |
C5—C4—C3 | 113.46 (16) | C17—C16—H16 | 119.6 |
C5—C4—H4A | 108.9 | C15—C16—H16 | 119.6 |
C3—C4—H4A | 108.9 | C16—C17—C18 | 120.83 (18) |
C5—C4—H4B | 108.9 | C16—C17—H17 | 119.6 |
C3—C4—H4B | 108.9 | C18—C17—H17 | 119.6 |
H4A—C4—H4B | 107.7 | C19—C18—C17 | 118.55 (17) |
C4—C5—C6 | 114.18 (15) | C19—C18—H18 | 120.7 |
C4—C5—H5A | 108.7 | C17—C18—H18 | 120.7 |
C6—C5—H5A | 108.7 | O3—C19—C18 | 124.06 (16) |
C4—C5—H5B | 108.7 | O3—C19—C20 | 115.45 (16) |
C6—C5—H5B | 108.7 | C18—C19—C20 | 120.48 (17) |
H5A—C5—H5B | 107.6 | C15—C20—C19 | 121.17 (16) |
C8—C6—C5 | 108.04 (15) | C15—C20—H20 | 119.4 |
C8—C6—C7 | 107.14 (13) | C19—C20—H20 | 119.4 |
C5—C6—C7 | 115.39 (14) | O2—C21—H21A | 109.5 |
C8—C6—H6 | 108.7 | O2—C21—H21B | 109.5 |
C5—C6—H6 | 108.7 | H21A—C21—H21B | 109.5 |
C7—C6—H6 | 108.7 | O2—C21—H21C | 109.5 |
N1—C7—C15 | 111.28 (14) | H21A—C21—H21C | 109.5 |
N1—C7—C6 | 109.93 (14) | H21B—C21—H21C | 109.5 |
C15—C7—C6 | 111.21 (13) | O3—C22—H22A | 109.5 |
N1—C7—H7 | 108.1 | O3—C22—H22B | 109.5 |
C15—C7—H7 | 108.1 | H22A—C22—H22B | 109.5 |
C6—C7—H7 | 108.1 | O3—C22—H22C | 109.5 |
O1—C8—C2 | 124.55 (16) | H22A—C22—H22C | 109.5 |
O1—C8—C6 | 123.99 (16) | H22B—C22—H22C | 109.5 |
C2—C8—C6 | 111.46 (14) | C7—N1—C1 | 113.91 (13) |
C14—C9—C10 | 118.53 (17) | C7—N1—H1N | 109.3 (12) |
C14—C9—C1 | 119.04 (16) | C1—N1—H1N | 109.6 (11) |
C10—C9—C1 | 122.31 (15) | C13—O2—C21 | 117.20 (16) |
C11—C10—C9 | 120.39 (17) | C19—O3—C22 | 118.64 (15) |
N1—C1—C2—C8 | 56.22 (18) | C10—C11—C12—C13 | −0.1 (3) |
C9—C1—C2—C8 | 179.60 (13) | C11—C12—C13—O2 | −178.66 (17) |
N1—C1—C2—C3 | −64.51 (19) | C11—C12—C13—C14 | 1.0 (3) |
C9—C1—C2—C3 | 58.88 (19) | C10—C9—C14—C13 | 0.3 (3) |
C8—C2—C3—C4 | −53.64 (19) | C1—C9—C14—C13 | −175.81 (15) |
C1—C2—C3—C4 | 66.8 (2) | O2—C13—C14—C9 | 178.61 (16) |
C2—C3—C4—C5 | 45.2 (2) | C12—C13—C14—C9 | −1.0 (3) |
C3—C4—C5—C6 | −44.8 (2) | N1—C7—C15—C20 | −25.2 (2) |
C4—C5—C6—C8 | 52.4 (2) | C6—C7—C15—C20 | 97.7 (2) |
C4—C5—C6—C7 | −67.4 (2) | N1—C7—C15—C16 | 155.10 (16) |
C8—C6—C7—N1 | −57.64 (18) | C6—C7—C15—C16 | −82.0 (2) |
C5—C6—C7—N1 | 62.69 (18) | C20—C15—C16—C17 | 0.5 (3) |
C8—C6—C7—C15 | 178.66 (15) | C7—C15—C16—C17 | −179.85 (16) |
C5—C6—C7—C15 | −61.0 (2) | C15—C16—C17—C18 | −0.6 (3) |
C3—C2—C8—O1 | −116.08 (19) | C16—C17—C18—C19 | 0.4 (3) |
C1—C2—C8—O1 | 118.86 (18) | C17—C18—C19—O3 | −179.87 (18) |
C3—C2—C8—C6 | 63.68 (17) | C17—C18—C19—C20 | −0.2 (3) |
C1—C2—C8—C6 | −61.37 (18) | C16—C15—C20—C19 | −0.3 (3) |
C5—C6—C8—O1 | 116.90 (19) | C7—C15—C20—C19 | −179.91 (15) |
C7—C6—C8—O1 | −118.19 (18) | O3—C19—C20—C15 | 179.84 (16) |
C5—C6—C8—C2 | −62.87 (18) | C18—C19—C20—C15 | 0.1 (3) |
C7—C6—C8—C2 | 62.04 (19) | C15—C7—N1—C1 | −178.96 (13) |
N1—C1—C9—C14 | −158.74 (15) | C6—C7—N1—C1 | 57.38 (18) |
C2—C1—C9—C14 | 78.57 (19) | C9—C1—N1—C7 | −179.40 (14) |
N1—C1—C9—C10 | 25.3 (2) | C2—C1—N1—C7 | −56.55 (19) |
C2—C1—C9—C10 | −97.36 (18) | C12—C13—O2—C21 | 3.2 (3) |
C14—C9—C10—C11 | 0.5 (3) | C14—C13—O2—C21 | −176.39 (17) |
C1—C9—C10—C11 | 176.49 (16) | C18—C19—O3—C22 | −10.4 (3) |
C9—C10—C11—C12 | −0.6 (3) | C20—C19—O3—C22 | 169.87 (17) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N···O1i | 0.890 (18) | 2.352 (18) | 3.1901 (19) | 157.0 (16) |
Symmetry code: (i) x, −y+3/2, z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C22H25NO3 |
Mr | 351.43 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 298 |
a, b, c (Å) | 22.3843 (9), 6.5666 (3), 13.0745 (4) |
β (°) | 106.382 (2) |
V (Å3) | 1843.78 (13) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.08 |
Crystal size (mm) | 0.40 × 0.28 × 0.15 |
Data collection | |
Diffractometer | Bruker APEXII CCD area-detector diffractometer |
Absorption correction | Multi-scan (SADABS; Bruker, 1999) |
Tmin, Tmax | 0.967, 0.988 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 12835, 3971, 2326 |
Rint | 0.037 |
(sin θ/λ)max (Å−1) | 0.667 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.049, 0.136, 1.06 |
No. of reflections | 3971 |
No. of parameters | 241 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.30, −0.23 |
Computer programs: APEX2 (Bruker, 2004), APEX2 and SAINT-Plus (Bruker, 2004), SAINT-Plus and XPREP (Bruker, 2004), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N···O1i | 0.890 (18) | 2.352 (18) | 3.1901 (19) | 157.0 (16) |
Symmetry code: (i) x, −y+3/2, z+1/2. |
Acknowledgements
The authors acknowledge the Department of Chemistry, IIT Madras, for the X-ray data collection.
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.
3-Azabicyclo[3.3.1]nonanes are an important class of heterocyclic compounds due to their broad-spectrum of biological activities such as analgesic, antogonistic, anti-inflammatory, local anesthetic and hypotensive activity (Jeyaraman & Avila, 1981). The 3-azabicyclo[3.3.1]nonane pharmacophore is present in numerous naturally occuring diterpenoid/norditerpenoid alkaloids such as methyllycaconitine, elatine, nudicauline, delsoline, delcorine and so on, they act as potential nicotinic acetylcholine receptor antagonists (Hardick et al. 1996; Barker et al. 2005). However, the biological activity mainly depends on the stereochemistry of the molecule; hence, it is of immense help to establish the structures of the synthesized molecules. For the synthesized title compound, several stereoisomers are possible with conformations such as chair-chair (Parthiban et al., 2008a, 2008b, 2008c, 2009a, 2009b, 2009c), chair-boat (Smith-Verdier et al., 1983) and boat-boat (Padegimas & Kovacic, 1972). Hence, the present crystal study was undertaken to explore the configuration and conformation of the synthesized title compound.
The crystallographic analysis of the title compound shows that the piperidine ring adopts a near ideal chair conformation. The total puckering amplitude, QT, is 0.600 (2) Å and the phase angle, θ, is 174.96 (19)° (Cremer & Pople, 1975). The smallest displacement asymmetry parameters being q2 and q3 are 0.053 (2) and -0.598 (2) Å (Nardelli, 1983). The deviation of ring atoms C8 and N1 from the C1/C2/C6/C7 plane are 0.712 (3) and -0.629 (3) Å, respectively.
According to the crystallographic analysis, the cyclohexane ring slightly deviates from the ideal chair conformation. The total puckering amplitude, QT = 0.559 (2) Å and phase angle θ = 166.6 (2)° (Cremer & Pople, 1975). The smallest displacement asymmetry parameters being q2 = 0.130 (2) and q3 = -0.544 (2)Å (Nardelli, 1983). The deviation of ring atoms C4 and C8 from the C2/C3/C5/C6 plane are -0.537 (4) and 0.718 (3) Å, respectively.
Hence the title compound, C22H25NO3, exists in a chair-chair conformation with equatorial orientation of the meta-methoxyphenyl groups on both sides of the secondary amino group on the heterocycle. The title compound is a positional isomer of 2,4-bis(2-methoxyphenyl)-3- azabicyclo[3.3.1]nonan-9-one (Parthiban et al., 2009a) and 2,4-bis (4-methoxyphenyl)-3-azabicyclo[3.3.1]nonan-9-one (Cox et al., 1985). Similar to the title compound the ortho as well as the para isomers also exhibit twin-chair conformations with equatorial disposition of the anisyl rings on both sides of the secondary amino group. In the title compound, the meta-methoxyphenyl rings are orientated at an angle of 25.02 (3)° with respect to one another whereas in the ortho and para isomer, the phenyl rings are orientated at an angle of 33.86 (3)° and 37.43 (4)° respectively.
The torsion angles of C8-C2-C1-C9 and C8-C6-C7-C15 are 179.64 (4) and 178.66 (3)°, respectively, for the title compound, which is very similar to those of its ortho isomer (-179.66 (3) and -179.76 (4)°, respectively) and those for the para isomer (178.2 (2) and 177.9 (4)°, respectively).
The crystal packing is dominated by shape recognition, by van der Waals interactions and is stabilized by an intermolecular N-H···O hydrogen bond (Table 1). In the ortho isomer, on the other hand, the crystal structure exhibits an intermolecular N-H···π interaction (N1-H1A···Cg1 = 2.75 Å).