organic compounds
(R)-Doxylaminium (R,R)-tartrate
aDepartment of Studies in Chemistry, University of Mysore, Mysore 570 006, India, and bDepartment of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland
*Correspondence e-mail: mkubicki@amu.edu.pl
In the title compound (systematic name: (R)-dimethyl{2-[1-phenyl-1-(pyridin-2-yl)ethoxy]ethyl}azanium (R,R)-3-carboxy-2,3-dihydroxypropanoate), C17H23N2O+·C4H5O6−, the doxylaminium cation is protonated at the N atom. The tartrate monoanions are linked by short, almost linear O—H⋯O hydrogen bonds into chains extended along [100]. These chains are interlinked by anion–pyridine O—H⋯N hydrogen bonds into a two-dimensional grid structure. WeakC—H⋯O interactions also play a role in the crystal packing. An intramolecular hydroxy–carboxylate O—H⋯O hydrogen bond influences the conformation of the anion: the hydrogen-bonded fragment is almost planar, the maximum deviation from the mean plane being 0.059 (14) Å. In the cation, the aromatic rings are almost perpendicular [dihedral angle = 84.94 (8)°] and the conformation of the O—C—C—N chain is gauche(−), the dihedral angle is −76.6 (2)°. The was assigned on the basis of known of the parent compound.
Related literature
For related strucures, see: Braitenbach & Parvez (2001); Parvez & Sabir (1998); Parvez et al. (2001). For general literature on doxylamine, see, for example: Casy (1991); Eccles et al. (1995). For graph-set motifs, see: Etter et al. (1990); Bernstein et al. (1995). For a description of the Cambridge Structural Database, see: Allen (2002).
Experimental
Crystal data
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Refinement
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Data collection: CrysAlis PRO (Agilent, 2011); cell CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SIR92 (Altomare et al., 1993); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP (Sheldrick, 2008); software used to prepare material for publication: SHELXL97.
Supporting information
10.1107/S160053681200935X/nr2021sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S160053681200935X/nr2021Isup2.hkl
Supporting information file. DOI: 10.1107/S160053681200935X/nr2021Isup3.cml
The title compound was obtained as a gift sample from R. L. Fine Chem., Bengaluru, India. The compound was recrystallized from methanol by slow evaporation (m.p: 388 K).
Hydrogen atoms attached to O and N atoms were found in difference Fourier maps and isotropically refined, all other H atoms were put in the idealized positions, and refined as riding model. Their isotropic thermal parameters were set at 1.2 (1.5 for methyl groups) times Ueq's of appropriate carrier atoms. The Friedel pairs were not merged, however their coverage is relatively low, of ca 50%.
Doxylamine (dimethyl-[2-(1-phenyl-1-pyridin-2-yl-ethoxy)-ethyl]-amine) is a chiral tertiary aminoalkyl ether, which exhibits an antihistaminic action on the H1 receptor site (e.g. Casy, 1991). It is used as a short-term sedative, and - in combination with other drugs - as a night-time cold and allergy relief drug (Eccles et al., 1995).
There are not many crystal structures of related compounds in the Cambridge Crystallographic Database (Allen, 2002), and these are exclusively salts: monoprotonated doxylaminium hydrogen succinate (Parvez et al., 2001), and diprotonated doxylaminium tetrachlorocuprate(II) (Braitenbach & Parvez, 2001), and isostructural tetrachlorozincate(II) and tetrachlorocobaltate(II) (Parvez & Sabir, 1998). In view of the importance of doxylamine, we have determined the crystal and molecular structure of the title salt, (1, Scheme 1), (R)-doxylaminium (R,R)-tartarate. The
was assigned on the basis of known of the parent compound.In 1 doxylamine is monoprotonated at N44, thus giving a quaternary ammonium cation (Fig. 1). This 'additional' hydrogen atom was found in the difference Fourier map and successfully refined. The aromatic rings in the cation are almost perpendicular, the dihedral angle between the least-squares planes of phenyl (planar within 0.0064 (16) Å) and pyridine (0.0056 (16) Å) rings is 84.94 (8)°. The conformation along C—O—C—C—N chain is tg-, the appropriate torsion angles are -164.77 (18)° and -76.6 (2)°. Similar conformation has been observed in previously reported doxylamine salts, despite the presence of intra-cationic hydrogen bonds in the di-cations (Parvez & Sabir, 1998, Braitenbach & Parvez, 2001).
In the anion the carbon chain is in an extended conformation (C—C—C—C torsion angle is -178.33 (16)°), and the overall conformation of the anion might be described by the dihedral angle betwen the two approximately planar 'halves': C1A, O11A, O12A, C2A and C3A, C4A, O41A, O42A, which is 43.45 (8) °. It might be noted that due to the intramolecular O3A—H···O41A hydrogen bond (cf. Table 1), the O3A oxygen atom is almost coplanar with the CCOO plane (0.033 (4) Å), while O2A is significantly deviated from similar plane, by -0.420 (3) Å.
In the crystal very short and almost linear O—H···O (x + 1,y,z) hydrogen bonds (O—H 1.12 (3) Å, H···O 1.33 (3) Å, O···O 2.4475 (18) Å, O—H···O 178 (3) °) connect the anions into infinite chains along x direction. As frequent happens for this kind of short bonds, the O—H bond is elongated, while H···O contact is quite short, which might suggest the covalent component in both of them. The anionic chains are connexted with the cations by means of N—H···O and O—H···N hydrogen bonds creating the rings (Fig. 2) which can be described as R65(36) (Etter et al., 1990, Bernstein et al., 1995). Repetition of these rings produces the chessboard-like pattern of anions and cations in the
(Fig. 3). Some secondary C—H···O interactions are also playing a role in the crystal packing.For related strucures, see: Braitenbach & Parvez (2001); Parvez & Sabir (1998); Parvez et al. (2001). For general literature on doxylamine, see, for example: Casy (1991); Eccles et al. (1995). For graph-set motifs, see: Etter et al. (1990); Bernstein et al. (1995). For a description of the Cambridge Structural Database, see: Allen (2002).
Data collection: CrysAlis PRO (Agilent, 2011); cell
CrysAlis PRO (Agilent, 2011); data reduction: CrysAlis PRO (Agilent, 2011); program(s) used to solve structure: SIR92 (Altomare et al., 1993); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP (Sheldrick, 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).Fig. 1. Anisotropic ellipsoid representation of the ionic components of the salt 1, together with atom labelling scheme. The ellipsoids are drawn at 50% probability level, hydrogen atoms are depicted as spheres with arbitrary radii. Intramolecular hydrogen bond is shown as dashed line. | |
Fig. 2. The hydrogen-bonded ring of cations and anions. Hydrogen bonds are drawn as dashed lines, symmetry codes: (i) x,y,z; (ii) 1 - x,1/2 + y,1 - z; (iii) -1 + x,y,z; (iv) -x,1/2 + y,1 - z. | |
Fig. 3. The crystal packing as seen approximately along c-direction, hydrogen bonds, including weak C—H···O interactions listed in table 1) are drawn as dashed lines. |
C17H23N2O+·C4H5O6− | F(000) = 448 |
Mr = 420.45 | Dx = 1.283 Mg m−3 |
Monoclinic, P21 | Mo Kα radiation, λ = 0.7107 Å |
a = 7.4419 (4) Å | Cell parameters from 1885 reflections |
b = 18.4394 (8) Å | θ = 2.9–27.8° |
c = 8.3517 (4) Å | µ = 0.10 mm−1 |
β = 108.301 (5)° | T = 295 K |
V = 1088.09 (9) Å3 | Block, colourless |
Z = 2 | 0.35 × 0.2 × 0.15 mm |
Agilent Xcalibur Eos diffractometer | 3539 independent reflections |
Radiation source: Enhance (Mo) X-ray Source | 3228 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.011 |
Detector resolution: 16.1544 pixels mm-1 | θmax = 27.9°, θmin = 2.9° |
ω scan | h = −5→9 |
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2011) | k = −23→19 |
Tmin = 0.991, Tmax = 1.000 | l = −10→10 |
4562 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)] = 0.035 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.079 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.06 | w = 1/[σ2(Fo2) + (0.0316P)2 + 0.1652P] where P = (Fo2 + 2Fc2)/3 |
3539 reflections | (Δ/σ)max = 0.001 |
290 parameters | Δρmax = 0.11 e Å−3 |
1 restraint | Δρmin = −0.16 e Å−3 |
C17H23N2O+·C4H5O6− | V = 1088.09 (9) Å3 |
Mr = 420.45 | Z = 2 |
Monoclinic, P21 | Mo Kα radiation |
a = 7.4419 (4) Å | µ = 0.10 mm−1 |
b = 18.4394 (8) Å | T = 295 K |
c = 8.3517 (4) Å | 0.35 × 0.2 × 0.15 mm |
β = 108.301 (5)° |
Agilent Xcalibur Eos diffractometer | 3539 independent reflections |
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2011) | 3228 reflections with I > 2σ(I) |
Tmin = 0.991, Tmax = 1.000 | Rint = 0.011 |
4562 measured reflections |
R[F2 > 2σ(F2)] = 0.035 | 1 restraint |
wR(F2) = 0.079 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.06 | Δρmax = 0.11 e Å−3 |
3539 reflections | Δρmin = −0.16 e Å−3 |
290 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 > 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 | ||
C1 | 0.4272 (3) | 0.67447 (11) | 0.6599 (2) | 0.0349 (5) | |
C11 | 0.3002 (4) | 0.71964 (15) | 0.7339 (3) | 0.0537 (6) | |
H11A | 0.1778 | 0.7251 | 0.6511 | 0.081* | |
H11B | 0.3559 | 0.7666 | 0.7654 | 0.081* | |
H11C | 0.2870 | 0.6956 | 0.8316 | 0.081* | |
C21 | 0.4472 (3) | 0.70427 (11) | 0.4958 (3) | 0.0372 (5) | |
C22 | 0.5716 (4) | 0.67112 (15) | 0.4264 (3) | 0.0524 (6) | |
H22 | 0.6417 | 0.6313 | 0.4799 | 0.063* | |
C23 | 0.5930 (5) | 0.69689 (19) | 0.2769 (4) | 0.0790 (10) | |
H23 | 0.6777 | 0.6744 | 0.2313 | 0.095* | |
C24 | 0.4894 (6) | 0.7554 (2) | 0.1966 (4) | 0.0884 (13) | |
H24 | 0.5045 | 0.7727 | 0.0970 | 0.106* | |
C25 | 0.3652 (6) | 0.78785 (17) | 0.2625 (4) | 0.0791 (11) | |
H25 | 0.2945 | 0.8273 | 0.2075 | 0.095* | |
C26 | 0.3427 (4) | 0.76266 (14) | 0.4116 (3) | 0.0562 (7) | |
H26 | 0.2565 | 0.7852 | 0.4553 | 0.067* | |
C31 | 0.6242 (3) | 0.66822 (12) | 0.7900 (2) | 0.0345 (4) | |
N32 | 0.7191 (3) | 0.73082 (10) | 0.8328 (2) | 0.0462 (5) | |
C33 | 0.8949 (4) | 0.72791 (14) | 0.9414 (3) | 0.0574 (7) | |
H33 | 0.9616 | 0.7712 | 0.9701 | 0.069* | |
C34 | 0.9824 (3) | 0.66531 (15) | 1.0129 (3) | 0.0504 (6) | |
H34 | 1.1049 | 0.6659 | 1.0880 | 0.061* | |
C35 | 0.8848 (4) | 0.60232 (14) | 0.9705 (3) | 0.0536 (7) | |
H35 | 0.9394 | 0.5587 | 1.0171 | 0.064* | |
C36 | 0.7034 (3) | 0.60348 (13) | 0.8576 (3) | 0.0477 (6) | |
H36 | 0.6354 | 0.5606 | 0.8277 | 0.057* | |
O41 | 0.3570 (2) | 0.60073 (8) | 0.63556 (17) | 0.0390 (4) | |
C42 | 0.1862 (3) | 0.58833 (13) | 0.5017 (3) | 0.0426 (5) | |
H42A | 0.2110 | 0.5902 | 0.3945 | 0.051* | |
H42B | 0.0949 | 0.6258 | 0.5019 | 0.051* | |
C43 | 0.1071 (3) | 0.51528 (13) | 0.5234 (3) | 0.0464 (6) | |
H43A | 0.1131 | 0.5100 | 0.6405 | 0.056* | |
H43B | −0.0253 | 0.5141 | 0.4559 | 0.056* | |
N44 | 0.2040 (3) | 0.45177 (11) | 0.4760 (2) | 0.0503 (5) | |
H44 | 0.193 (4) | 0.4545 (15) | 0.371 (3) | 0.057 (7)* | |
C45 | 0.1053 (6) | 0.38380 (16) | 0.4956 (4) | 0.0868 (11) | |
H45A | 0.1210 | 0.3759 | 0.6128 | 0.130* | |
H45B | 0.1582 | 0.3437 | 0.4524 | 0.130* | |
H45C | −0.0270 | 0.3879 | 0.4341 | 0.130* | |
C46 | 0.4095 (4) | 0.44705 (16) | 0.5709 (3) | 0.0659 (8) | |
H46A | 0.4265 | 0.4436 | 0.6894 | 0.099* | |
H46B | 0.4725 | 0.4896 | 0.5493 | 0.099* | |
H46C | 0.4621 | 0.4049 | 0.5351 | 0.099* | |
C1A | 0.0805 (3) | 0.41864 (11) | 0.0025 (2) | 0.0315 (4) | |
O11A | −0.0017 (2) | 0.42724 (10) | −0.14690 (18) | 0.0513 (4) | |
O12A | 0.00315 (19) | 0.41842 (9) | 0.12021 (18) | 0.0435 (4) | |
C2A | 0.2953 (3) | 0.40945 (11) | 0.0626 (2) | 0.0304 (4) | |
H2A | 0.3307 | 0.3787 | −0.0184 | 0.036* | |
O2A | 0.3691 (2) | 0.37835 (9) | 0.22459 (18) | 0.0396 (4) | |
H2A1 | 0.344 (5) | 0.331 (2) | 0.219 (4) | 0.095 (12)* | |
C3A | 0.3858 (3) | 0.48319 (11) | 0.0658 (3) | 0.0335 (4) | |
H3A | 0.3418 | 0.5043 | −0.0476 | 0.040* | |
O3A | 0.3330 (2) | 0.52934 (9) | 0.1788 (2) | 0.0472 (4) | |
H3A1 | 0.431 (4) | 0.5477 (17) | 0.236 (4) | 0.070 (10)* | |
C4A | 0.5998 (3) | 0.47547 (12) | 0.1202 (3) | 0.0360 (5) | |
O41A | 0.6965 (2) | 0.50948 (10) | 0.2428 (2) | 0.0549 (5) | |
O42A | 0.6590 (2) | 0.43365 (9) | 0.0257 (2) | 0.0470 (4) | |
H42 | 0.816 (5) | 0.4273 (19) | 0.067 (4) | 0.095 (10)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0333 (10) | 0.0350 (12) | 0.0343 (10) | −0.0003 (10) | 0.0076 (8) | −0.0030 (9) |
C11 | 0.0449 (13) | 0.0630 (17) | 0.0533 (14) | 0.0032 (13) | 0.0154 (11) | −0.0132 (12) |
C21 | 0.0427 (12) | 0.0327 (11) | 0.0315 (10) | −0.0088 (10) | 0.0047 (9) | −0.0027 (8) |
C22 | 0.0659 (16) | 0.0510 (14) | 0.0456 (13) | −0.0069 (14) | 0.0252 (12) | −0.0047 (11) |
C23 | 0.110 (3) | 0.082 (2) | 0.0596 (18) | −0.041 (2) | 0.0468 (19) | −0.0242 (17) |
C24 | 0.135 (3) | 0.084 (3) | 0.0394 (15) | −0.070 (2) | 0.0173 (19) | −0.0019 (16) |
C25 | 0.104 (3) | 0.0553 (19) | 0.0509 (17) | −0.0315 (19) | −0.0144 (17) | 0.0186 (14) |
C26 | 0.0590 (16) | 0.0426 (14) | 0.0527 (14) | −0.0067 (13) | −0.0030 (12) | 0.0058 (11) |
C31 | 0.0364 (11) | 0.0334 (11) | 0.0343 (10) | −0.0040 (10) | 0.0119 (8) | −0.0004 (9) |
N32 | 0.0458 (11) | 0.0314 (10) | 0.0516 (11) | −0.0025 (9) | 0.0012 (9) | −0.0018 (8) |
C33 | 0.0480 (14) | 0.0370 (13) | 0.0696 (17) | −0.0080 (12) | −0.0069 (13) | −0.0025 (12) |
C34 | 0.0364 (12) | 0.0471 (14) | 0.0565 (14) | −0.0046 (12) | −0.0016 (10) | 0.0051 (11) |
C35 | 0.0496 (14) | 0.0397 (14) | 0.0600 (15) | 0.0014 (12) | 0.0007 (12) | 0.0134 (11) |
C36 | 0.0441 (13) | 0.0355 (13) | 0.0531 (13) | −0.0067 (11) | 0.0003 (11) | 0.0055 (10) |
O41 | 0.0360 (8) | 0.0380 (9) | 0.0358 (7) | −0.0070 (7) | 0.0007 (6) | 0.0027 (6) |
C42 | 0.0364 (12) | 0.0467 (13) | 0.0384 (11) | −0.0038 (11) | 0.0026 (9) | −0.0004 (10) |
C43 | 0.0421 (13) | 0.0539 (15) | 0.0386 (12) | −0.0148 (12) | 0.0060 (10) | −0.0045 (11) |
N44 | 0.0770 (15) | 0.0429 (11) | 0.0271 (10) | −0.0149 (11) | 0.0106 (10) | −0.0013 (8) |
C45 | 0.159 (3) | 0.0560 (17) | 0.0523 (16) | −0.046 (2) | 0.043 (2) | −0.0080 (13) |
C46 | 0.082 (2) | 0.0551 (16) | 0.0463 (15) | 0.0186 (15) | −0.0007 (14) | −0.0058 (12) |
C1A | 0.0257 (9) | 0.0330 (11) | 0.0360 (10) | −0.0023 (9) | 0.0100 (8) | −0.0020 (9) |
O11A | 0.0340 (7) | 0.0819 (13) | 0.0354 (8) | 0.0022 (8) | 0.0070 (7) | 0.0005 (8) |
O12A | 0.0272 (7) | 0.0677 (11) | 0.0392 (8) | 0.0042 (7) | 0.0155 (6) | 0.0038 (8) |
C2A | 0.0249 (9) | 0.0335 (11) | 0.0330 (10) | 0.0038 (9) | 0.0098 (8) | −0.0039 (8) |
O2A | 0.0344 (8) | 0.0369 (9) | 0.0412 (8) | 0.0017 (7) | 0.0029 (6) | 0.0025 (7) |
C3A | 0.0263 (10) | 0.0377 (11) | 0.0361 (10) | 0.0010 (9) | 0.0093 (8) | −0.0033 (9) |
O3A | 0.0347 (9) | 0.0432 (10) | 0.0643 (11) | 0.0004 (8) | 0.0161 (8) | −0.0182 (8) |
C4A | 0.0256 (10) | 0.0416 (12) | 0.0420 (11) | −0.0048 (10) | 0.0125 (9) | 0.0004 (10) |
O41A | 0.0317 (8) | 0.0688 (12) | 0.0575 (10) | −0.0053 (8) | 0.0042 (7) | −0.0198 (9) |
O42A | 0.0244 (7) | 0.0647 (11) | 0.0551 (9) | −0.0016 (7) | 0.0172 (7) | −0.0156 (8) |
C1—O41 | 1.448 (2) | C42—C43 | 1.503 (3) |
C1—C21 | 1.526 (3) | C42—H42A | 0.9700 |
C1—C11 | 1.528 (3) | C42—H42B | 0.9700 |
C1—C31 | 1.531 (3) | C43—N44 | 1.492 (3) |
C11—H11A | 0.9600 | C43—H43A | 0.9700 |
C11—H11B | 0.9600 | C43—H43B | 0.9700 |
C11—H11C | 0.9600 | N44—C45 | 1.487 (3) |
C21—C22 | 1.380 (3) | N44—C46 | 1.488 (3) |
C21—C26 | 1.384 (3) | N44—H44 | 0.86 (3) |
C22—C23 | 1.390 (4) | C45—H45A | 0.9600 |
C22—H22 | 0.9300 | C45—H45B | 0.9600 |
C23—C24 | 1.372 (5) | C45—H45C | 0.9600 |
C23—H23 | 0.9300 | C46—H46A | 0.9600 |
C24—C25 | 1.356 (5) | C46—H46B | 0.9600 |
C24—H24 | 0.9300 | C46—H46C | 0.9600 |
C25—C26 | 1.387 (4) | C1A—O11A | 1.216 (2) |
C25—H25 | 0.9300 | C1A—O12A | 1.285 (2) |
C26—H26 | 0.9300 | C1A—C2A | 1.527 (3) |
C31—N32 | 1.342 (3) | C2A—O2A | 1.412 (2) |
C31—C36 | 1.372 (3) | C2A—C3A | 1.514 (3) |
N32—C33 | 1.339 (3) | C2A—H2A | 0.9800 |
C33—C34 | 1.367 (4) | O2A—H2A1 | 0.89 (4) |
C33—H33 | 0.9300 | C3A—O3A | 1.415 (3) |
C34—C35 | 1.357 (4) | C3A—C4A | 1.519 (3) |
C34—H34 | 0.9300 | C3A—H3A | 0.9800 |
C35—C36 | 1.383 (3) | O3A—H3A1 | 0.81 (3) |
C35—H35 | 0.9300 | C4A—O41A | 1.223 (2) |
C36—H36 | 0.9300 | C4A—O42A | 1.277 (2) |
O41—C42 | 1.423 (2) | O42A—H42 | 1.12 (3) |
O41—C1—C21 | 110.18 (16) | C43—C42—H42A | 109.7 |
O41—C1—C11 | 109.08 (18) | O41—C42—H42B | 109.7 |
C21—C1—C11 | 114.45 (19) | C43—C42—H42B | 109.7 |
O41—C1—C31 | 104.58 (16) | H42A—C42—H42B | 108.2 |
C21—C1—C31 | 108.82 (17) | N44—C43—C42 | 115.6 (2) |
C11—C1—C31 | 109.26 (17) | N44—C43—H43A | 108.4 |
C1—C11—H11A | 109.5 | C42—C43—H43A | 108.4 |
C1—C11—H11B | 109.5 | N44—C43—H43B | 108.4 |
H11A—C11—H11B | 109.5 | C42—C43—H43B | 108.4 |
C1—C11—H11C | 109.5 | H43A—C43—H43B | 107.4 |
H11A—C11—H11C | 109.5 | C45—N44—C46 | 110.7 (3) |
H11B—C11—H11C | 109.5 | C45—N44—C43 | 109.6 (2) |
C22—C21—C26 | 118.4 (2) | C46—N44—C43 | 113.97 (18) |
C22—C21—C1 | 119.0 (2) | C45—N44—H44 | 105.8 (18) |
C26—C21—C1 | 122.6 (2) | C46—N44—H44 | 107.3 (17) |
C21—C22—C23 | 120.4 (3) | C43—N44—H44 | 109.1 (18) |
C21—C22—H22 | 119.8 | N44—C45—H45A | 109.5 |
C23—C22—H22 | 119.8 | N44—C45—H45B | 109.5 |
C24—C23—C22 | 120.2 (3) | H45A—C45—H45B | 109.5 |
C24—C23—H23 | 119.9 | N44—C45—H45C | 109.5 |
C22—C23—H23 | 119.9 | H45A—C45—H45C | 109.5 |
C25—C24—C23 | 119.9 (3) | H45B—C45—H45C | 109.5 |
C25—C24—H24 | 120.0 | N44—C46—H46A | 109.5 |
C23—C24—H24 | 120.0 | N44—C46—H46B | 109.5 |
C24—C25—C26 | 120.4 (3) | H46A—C46—H46B | 109.5 |
C24—C25—H25 | 119.8 | N44—C46—H46C | 109.5 |
C26—C25—H25 | 119.8 | H46A—C46—H46C | 109.5 |
C21—C26—C25 | 120.6 (3) | H46B—C46—H46C | 109.5 |
C21—C26—H26 | 119.7 | O11A—C1A—O12A | 125.72 (18) |
C25—C26—H26 | 119.7 | O11A—C1A—C2A | 119.27 (17) |
N32—C31—C36 | 121.09 (19) | O12A—C1A—C2A | 114.98 (16) |
N32—C31—C1 | 115.55 (18) | O2A—C2A—C3A | 108.10 (16) |
C36—C31—C1 | 123.34 (19) | O2A—C2A—C1A | 114.32 (16) |
C33—N32—C31 | 117.84 (19) | C3A—C2A—C1A | 108.68 (16) |
N32—C33—C34 | 124.1 (2) | O2A—C2A—H2A | 108.5 |
N32—C33—H33 | 118.0 | C3A—C2A—H2A | 108.5 |
C34—C33—H33 | 118.0 | C1A—C2A—H2A | 108.5 |
C35—C34—C33 | 117.8 (2) | C2A—O2A—H2A1 | 110 (2) |
C35—C34—H34 | 121.1 | O3A—C3A—C2A | 109.67 (17) |
C33—C34—H34 | 121.1 | O3A—C3A—C4A | 109.98 (16) |
C34—C35—C36 | 119.5 (2) | C2A—C3A—C4A | 109.87 (17) |
C34—C35—H35 | 120.2 | O3A—C3A—H3A | 109.1 |
C36—C35—H35 | 120.2 | C2A—C3A—H3A | 109.1 |
C31—C36—C35 | 119.7 (2) | C4A—C3A—H3A | 109.1 |
C31—C36—H36 | 120.1 | C3A—O3A—H3A1 | 105 (2) |
C35—C36—H36 | 120.1 | O41A—C4A—O42A | 126.91 (19) |
C42—O41—C1 | 117.05 (15) | O41A—C4A—C3A | 119.19 (19) |
O41—C42—C43 | 109.65 (18) | O42A—C4A—C3A | 113.88 (17) |
O41—C42—H42A | 109.7 | C4A—O42A—H42 | 113.8 (17) |
O41—C1—C21—C22 | −62.2 (3) | C33—C34—C35—C36 | 0.4 (4) |
C11—C1—C21—C22 | 174.4 (2) | N32—C31—C36—C35 | −0.7 (4) |
C31—C1—C21—C22 | 51.9 (3) | C1—C31—C36—C35 | 177.9 (2) |
O41—C1—C21—C26 | 116.5 (2) | C34—C35—C36—C31 | −0.1 (4) |
C11—C1—C21—C26 | −6.8 (3) | C21—C1—O41—C42 | −54.2 (2) |
C31—C1—C21—C26 | −129.4 (2) | C11—C1—O41—C42 | 72.3 (2) |
C26—C21—C22—C23 | 1.1 (4) | C31—C1—O41—C42 | −170.96 (17) |
C1—C21—C22—C23 | 179.9 (2) | C1—O41—C42—C43 | −164.77 (18) |
C21—C22—C23—C24 | −0.4 (4) | O41—C42—C43—N44 | −76.6 (2) |
C22—C23—C24—C25 | −0.4 (5) | C42—C43—N44—C45 | −177.2 (2) |
C23—C24—C25—C26 | 0.4 (4) | C42—C43—N44—C46 | 58.2 (3) |
C22—C21—C26—C25 | −1.1 (4) | O11A—C1A—C2A—O2A | −161.60 (19) |
C1—C21—C26—C25 | −179.8 (2) | O12A—C1A—C2A—O2A | 20.3 (3) |
C24—C25—C26—C21 | 0.3 (4) | O11A—C1A—C2A—C3A | 77.6 (2) |
O41—C1—C31—N32 | 179.69 (18) | O12A—C1A—C2A—C3A | −100.6 (2) |
C21—C1—C31—N32 | 62.0 (2) | O2A—C2A—C3A—O3A | −63.9 (2) |
C11—C1—C31—N32 | −63.6 (2) | C1A—C2A—C3A—O3A | 60.7 (2) |
O41—C1—C31—C36 | 1.0 (3) | O2A—C2A—C3A—C4A | 57.1 (2) |
C21—C1—C31—C36 | −116.7 (2) | C1A—C2A—C3A—C4A | −178.33 (16) |
C11—C1—C31—C36 | 117.7 (2) | O3A—C3A—C4A—O41A | −2.5 (3) |
C36—C31—N32—C33 | 1.1 (3) | C2A—C3A—C4A—O41A | −123.3 (2) |
C1—C31—N32—C33 | −177.6 (2) | O3A—C3A—C4A—O42A | 179.04 (18) |
C31—N32—C33—C34 | −0.9 (4) | C2A—C3A—C4A—O42A | 58.2 (2) |
N32—C33—C34—C35 | 0.1 (4) |
D—H···A | D—H | H···A | D···A | D—H···A |
C42—H42A···O3A | 0.97 | 2.52 | 3.391 (3) | 149 |
C43—H43B···O41Ai | 0.97 | 2.27 | 3.217 (3) | 165 |
N44—H44···O12A | 0.86 (3) | 2.23 (3) | 2.942 (2) | 140 (2) |
C46—H46C···O2A | 0.96 | 2.51 | 3.084 (3) | 118 |
O2A—H2A1···N32ii | 0.89 (4) | 1.92 (4) | 2.804 (2) | 171 (3) |
O3A—H3A1···O41A | 0.81 (3) | 2.08 (3) | 2.613 (2) | 123 (3) |
O42A—H42···O12Aiii | 1.12 (3) | 1.33 (3) | 2.4475 (18) | 178 (3) |
Symmetry codes: (i) x−1, y, z; (ii) −x+1, y−1/2, −z+1; (iii) x+1, y, z. |
Experimental details
Crystal data | |
Chemical formula | C17H23N2O+·C4H5O6− |
Mr | 420.45 |
Crystal system, space group | Monoclinic, P21 |
Temperature (K) | 295 |
a, b, c (Å) | 7.4419 (4), 18.4394 (8), 8.3517 (4) |
β (°) | 108.301 (5) |
V (Å3) | 1088.09 (9) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.10 |
Crystal size (mm) | 0.35 × 0.2 × 0.15 |
Data collection | |
Diffractometer | Agilent Xcalibur Eos |
Absorption correction | Multi-scan (CrysAlis PRO; Agilent, 2011) |
Tmin, Tmax | 0.991, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 4562, 3539, 3228 |
Rint | 0.011 |
(sin θ/λ)max (Å−1) | 0.658 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.035, 0.079, 1.06 |
No. of reflections | 3539 |
No. of parameters | 290 |
No. of restraints | 1 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.11, −0.16 |
Computer programs: CrysAlis PRO (Agilent, 2011), SIR92 (Altomare et al., 1993), SHELXL97 (Sheldrick, 2008), XP (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
C42—H42A···O3A | 0.97 | 2.52 | 3.391 (3) | 149.3 |
C43—H43B···O41Ai | 0.97 | 2.27 | 3.217 (3) | 165.3 |
N44—H44···O12A | 0.86 (3) | 2.23 (3) | 2.942 (2) | 140 (2) |
C46—H46C···O2A | 0.96 | 2.51 | 3.084 (3) | 118.1 |
O2A—H2A1···N32ii | 0.89 (4) | 1.92 (4) | 2.804 (2) | 171 (3) |
O3A—H3A1···O41A | 0.81 (3) | 2.08 (3) | 2.613 (2) | 123 (3) |
O42A—H42···O12Aiii | 1.12 (3) | 1.33 (3) | 2.4475 (18) | 178 (3) |
Symmetry codes: (i) x−1, y, z; (ii) −x+1, y−1/2, −z+1; (iii) x+1, y, z. |
Acknowledgements
ASD thanks the University of Mysore for research facilities. HSY thanks R. L. Fine Chem., Bengaluru, for the gift sample of the title compound.
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.
Doxylamine (dimethyl-[2-(1-phenyl-1-pyridin-2-yl-ethoxy)-ethyl]-amine) is a chiral tertiary aminoalkyl ether, which exhibits an antihistaminic action on the H1 receptor site (e.g. Casy, 1991). It is used as a short-term sedative, and - in combination with other drugs - as a night-time cold and allergy relief drug (Eccles et al., 1995).
There are not many crystal structures of related compounds in the Cambridge Crystallographic Database (Allen, 2002), and these are exclusively salts: monoprotonated doxylaminium hydrogen succinate (Parvez et al., 2001), and diprotonated doxylaminium tetrachlorocuprate(II) (Braitenbach & Parvez, 2001), and isostructural tetrachlorozincate(II) and tetrachlorocobaltate(II) (Parvez & Sabir, 1998). In view of the importance of doxylamine, we have determined the crystal and molecular structure of the title salt, (1, Scheme 1), (R)-doxylaminium (R,R)-tartarate. The absolute configuration was assigned on the basis of known chirality of the parent compound.
In 1 doxylamine is monoprotonated at N44, thus giving a quaternary ammonium cation (Fig. 1). This 'additional' hydrogen atom was found in the difference Fourier map and successfully refined. The aromatic rings in the cation are almost perpendicular, the dihedral angle between the least-squares planes of phenyl (planar within 0.0064 (16) Å) and pyridine (0.0056 (16) Å) rings is 84.94 (8)°. The conformation along C—O—C—C—N chain is tg-, the appropriate torsion angles are -164.77 (18)° and -76.6 (2)°. Similar conformation has been observed in previously reported doxylamine salts, despite the presence of intra-cationic hydrogen bonds in the di-cations (Parvez & Sabir, 1998, Braitenbach & Parvez, 2001).
In the anion the carbon chain is in an extended conformation (C—C—C—C torsion angle is -178.33 (16)°), and the overall conformation of the anion might be described by the dihedral angle betwen the two approximately planar 'halves': C1A, O11A, O12A, C2A and C3A, C4A, O41A, O42A, which is 43.45 (8) °. It might be noted that due to the intramolecular O3A—H···O41A hydrogen bond (cf. Table 1), the O3A oxygen atom is almost coplanar with the CCOO plane (0.033 (4) Å), while O2A is significantly deviated from similar plane, by -0.420 (3) Å.
In the crystal very short and almost linear O—H···O (x + 1,y,z) hydrogen bonds (O—H 1.12 (3) Å, H···O 1.33 (3) Å, O···O 2.4475 (18) Å, O—H···O 178 (3) °) connect the anions into infinite chains along x direction. As frequent happens for this kind of short bonds, the O—H bond is elongated, while H···O contact is quite short, which might suggest the covalent component in both of them. The anionic chains are connexted with the cations by means of N—H···O and O—H···N hydrogen bonds creating the rings (Fig. 2) which can be described as R65(36) (Etter et al., 1990, Bernstein et al., 1995). Repetition of these rings produces the chessboard-like pattern of anions and cations in the crystal structure (Fig. 3). Some secondary C—H···O interactions are also playing a role in the crystal packing.