organic compounds
(3S)-2-Benzyl-3-carboxy-1,2,3,4-tetrahydroisoquinolinium chloride monohydrate
aSchool of Pharmacy and Pharmacology, University of KwaZulu Natal, Durban 4000, South Africa, and bSchool of Chemistry, University of KwaZulu Natal, Durban 4000, South Africa
*Correspondence e-mail: maguireg@ukzn.ac.za
In the title compound, C17H18NO2+·Cl−·H2O, a precursor to novel asymmetric catalysts, the N-containing six-membered ring of the tetrahydroquinolinium unit assumes a half-boat conformation. In the crystal, intermolecular O—H⋯O, O—H⋯Cl, N—H⋯Cl and C—H⋯O hydrogen bonds and C—H⋯π interactions link the molecules into a three-dimensional network.
Related literature
For related structures of tetrahydroisoquinoline derivatives, see: Naicker, Petzold et al. (2010); Naicker, Govender et al. (2010, 2011); Peters et al. (2010). For related structures with the same chiral centre and conformation of the six-membered ring, see: Naicker et al. (2009); Chakka et al. (2010).
Experimental
Crystal data
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Data collection: APEX2 (Bruker, 2006); cell SAINT (Bruker, 2006); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008b); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008b); molecular graphics: OLEX2 (Dolomanov et al., 2009); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S1600536810053122/is2635sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810053122/is2635Isup2.hkl
(S)-Methyl 2-benzyl-1,2,3,4-tetrahydroisoquinoline-3-carboxylate was added to a 10% (v/v) solution of HCl in water (5 mL). The mixture was then microwaved for 2 h at 120 °C, thereafter the reaction mixture was evaporated under reduced pressure to afford the title compound as a white solid.
Melting point 205–208 °C. IR (neat): 3339, 2501, 1712, 1224, 754, 701 cm-1. 1H NMR (400 MHz, CDCl3) δ = 3.28 (d, 1H), 3.36 (d, 1H), 4.37 (m, 5H), 7.13 (d, 1H), 7.25 (m, 3H) and 7.39 (m, 5H).
Recrystallization from 10% HCl in water afforded colourless crystals suitable for X-ray analysis.
All H atoms on carbons were positioned geometrically with C—H distances ranging from 0.95 to 1.00 Å and refined as riding on their parent atoms, with Uiso(H) = 1.2Ueq(C). Atoms H1, H2, H3A and H3B were located in a difference Fourier map. The distances of N1—H1, O2—H2, O3—H3A and O3—H3B were restrained to 0.97 (1) Å and the Uiso values of H3A and H3B were assigned as 1.2Ueq(O3).
The tetrahydroisoquinoline (TIQ) molecule and its derivatives have been widely investigated due to their biological and pharmaceutical properties. We have recently had much success with TIQ based ligands for both metal ligand (Peters et al., 2010) and organocatalysis (Naicker, Petzold et al., 2010). Bearing an acid
the title compound is a useful precursor to many of these novel asymmetric catalysts. The neutral form of this compound is commercially available but there has been no report of its single X-ray crystal structure.The structure has monoclinic (P21) symmetry with a single molecule in the π (C12—C17 ring) is observed within the crystal packing (Table 1). The most significant feature of the structure is the intermolecular hydrogen bonding array. The carboxylic acid (O2—H) hydrogen bonds to the water molecule which in turn interacts with two chloride ions. These ions interact further with another water molecule but also with the protonated tertiary amine nitrogen. This series of interactions helps to construct the three-dimensional network (Fig. 2 and Table 1).
together with a water molecule (Fig. 1). Various intra- and intermolecular short contact interactions (2.87–3.14 Å) occur but only one C15—H···From the
it is evident that the N-containing six membered ring assumes a half boat conformation (Fig. 1), this observation is similar to analogous structures that we have recently reported (Naicker et al., 2009; Naicker, Govender et al., 2010).For related structures of tetrahydroisoquinoline derivatives, see: Naicker, Petzold et al. (2010); Naicker, Govender et al. (2010, 2011); Peters et al. (2010). For related structures with the same chiral centre and conformation of the six-membered ring, see: Naicker et al. (2009); Chakka et al. (2010).
Data collection: APEX2 (Bruker, 2006); cell
SAINT (Bruker, 2006); data reduction: SAINT (Bruker, 2006); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008b); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008b); molecular graphics: OLEX2 (Dolomanov et al., 2009); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008b).Fig. 1. The molecular structure of the title compound with the atom numbering scheme. Displacement ellipsoids are drawn at the 50% probability level. | |
Fig. 2. Partial projection viewed along the a axis, depicting hydrogen bonding from the water molecule and chloride ion. Displacement ellipsoids are drawn at the 50% probability level. |
C17H18NO2+·Cl−·H2O | F(000) = 340 |
Mr = 321.79 | Dx = 1.283 Mg m−3 |
Monoclinic, P21 | Melting point: 479 K |
Hall symbol: P 2yb | Mo Kα radiation, λ = 0.71073 Å |
a = 8.6159 (8) Å | Cell parameters from 9083 reflections |
b = 10.0670 (9) Å | θ = 2.1–28.3° |
c = 10.1392 (9) Å | µ = 0.24 mm−1 |
β = 108.686 (2)° | T = 193 K |
V = 833.08 (13) Å3 | Needle, colourless |
Z = 2 | 0.30 × 0.11 × 0.02 mm |
Bruker Kappa DUO APEXII diffractometer | 4158 independent reflections |
Radiation source: fine-focus sealed tube | 3414 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.024 |
φ and ω scans | θmax = 28.3°, θmin = 2.1° |
Absorption correction: multi-scan (SADABS; Sheldrick, 2008a | h = −11→11 |
Tmin = 0.931, Tmax = 0.995 | k = −13→13 |
9083 measured reflections | l = −13→13 |
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.036 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.082 | w = 1/[σ2(Fo2) + (0.0365P)2 + 0.0675P] where P = (Fo2 + 2Fc2)/3 |
S = 1.04 | (Δ/σ)max < 0.001 |
4158 reflections | Δρmax = 0.19 e Å−3 |
213 parameters | Δρmin = −0.16 e Å−3 |
5 restraints | Absolute structure: Flack (1983), 1961 Friedel pairs |
Primary atom site location: structure-invariant direct methods | Absolute structure parameter: −0.01 (5) |
C17H18NO2+·Cl−·H2O | V = 833.08 (13) Å3 |
Mr = 321.79 | Z = 2 |
Monoclinic, P21 | Mo Kα radiation |
a = 8.6159 (8) Å | µ = 0.24 mm−1 |
b = 10.0670 (9) Å | T = 193 K |
c = 10.1392 (9) Å | 0.30 × 0.11 × 0.02 mm |
β = 108.686 (2)° |
Bruker Kappa DUO APEXII diffractometer | 4158 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 2008a | 3414 reflections with I > 2σ(I) |
Tmin = 0.931, Tmax = 0.995 | Rint = 0.024 |
9083 measured reflections |
R[F2 > 2σ(F2)] = 0.036 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.082 | Δρmax = 0.19 e Å−3 |
S = 1.04 | Δρmin = −0.16 e Å−3 |
4158 reflections | Absolute structure: Flack (1983), 1961 Friedel pairs |
213 parameters | Absolute structure parameter: −0.01 (5) |
5 restraints |
Experimental. Half sphere of data collected using the Bruker SAINT software package. Crystal to detector distance = 30 mm; combination of φ and ω scans of 0.5°, 30 s per °, 2 iterations |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
Cl1 | 0.49392 (7) | 0.38386 (5) | 0.55522 (5) | 0.04878 (14) | |
O1 | 0.52160 (16) | 0.58413 (12) | −0.04364 (13) | 0.0387 (3) | |
O2 | 0.6338 (2) | 0.76556 (14) | −0.10233 (14) | 0.0490 (4) | |
H2 | 0.629 (4) | 0.716 (3) | −0.184 (2) | 0.090 (9)* | |
O3 | 0.6423 (2) | 0.66136 (15) | 0.67265 (14) | 0.0555 (4) | |
H3A | 0.610 (3) | 0.7278 (19) | 0.601 (2) | 0.067* | |
H3B | 0.578 (3) | 0.5841 (17) | 0.634 (2) | 0.067* | |
N1 | 0.49861 (17) | 0.70659 (13) | 0.19862 (14) | 0.0280 (3) | |
H1 | 0.501 (2) | 0.7664 (16) | 0.2736 (15) | 0.038 (5)* | |
C1 | 0.6027 (2) | 0.59202 (17) | 0.27205 (18) | 0.0327 (4) | |
H1A | 0.5619 | 0.5600 | 0.3472 | 0.039* | |
H1B | 0.5925 | 0.5182 | 0.2052 | 0.039* | |
C2 | 0.7801 (2) | 0.62971 (17) | 0.33336 (17) | 0.0310 (4) | |
C3 | 0.8823 (2) | 0.5464 (2) | 0.43363 (19) | 0.0409 (5) | |
H3 | 0.8377 | 0.4710 | 0.4650 | 0.049* | |
C4 | 1.0477 (3) | 0.5725 (2) | 0.4878 (2) | 0.0483 (5) | |
H4 | 1.1170 | 0.5144 | 0.5550 | 0.058* | |
C5 | 1.1130 (2) | 0.6837 (2) | 0.4441 (2) | 0.0441 (5) | |
H5 | 1.2268 | 0.7026 | 0.4819 | 0.053* | |
C6 | 1.0113 (2) | 0.7668 (2) | 0.34518 (18) | 0.0368 (4) | |
H6 | 1.0564 | 0.8426 | 0.3149 | 0.044* | |
C7 | 0.8446 (2) | 0.74187 (16) | 0.28922 (17) | 0.0302 (4) | |
C8 | 0.7346 (2) | 0.83776 (17) | 0.18686 (17) | 0.0305 (4) | |
H8A | 0.7920 | 0.8686 | 0.1221 | 0.037* | |
H8B | 0.7157 | 0.9162 | 0.2385 | 0.037* | |
C9 | 0.5689 (2) | 0.77988 (16) | 0.10185 (16) | 0.0271 (3) | |
H9 | 0.4946 | 0.8568 | 0.0638 | 0.033* | |
C10 | 0.5722 (2) | 0.69626 (16) | −0.02157 (17) | 0.0292 (3) | |
C11 | 0.3223 (2) | 0.66112 (18) | 0.1368 (2) | 0.0354 (4) | |
H11A | 0.3204 | 0.5756 | 0.0880 | 0.043* | |
H11B | 0.2765 | 0.6452 | 0.2133 | 0.043* | |
C12 | 0.2151 (2) | 0.75869 (18) | 0.03655 (19) | 0.0343 (4) | |
C13 | 0.1818 (2) | 0.8829 (2) | 0.0808 (2) | 0.0411 (4) | |
H13 | 0.2281 | 0.9074 | 0.1759 | 0.049* | |
C14 | 0.0813 (3) | 0.9713 (2) | −0.0132 (3) | 0.0522 (6) | |
H14 | 0.0603 | 1.0566 | 0.0173 | 0.063* | |
C15 | 0.0118 (3) | 0.9354 (3) | −0.1511 (3) | 0.0551 (6) | |
H15 | −0.0581 | 0.9958 | −0.2150 | 0.066* | |
C16 | 0.0432 (3) | 0.8130 (2) | −0.1963 (2) | 0.0512 (5) | |
H16 | −0.0053 | 0.7886 | −0.2911 | 0.061* | |
C17 | 0.1460 (2) | 0.7249 (2) | −0.1032 (2) | 0.0417 (4) | |
H17 | 0.1694 | 0.6408 | −0.1351 | 0.050* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl1 | 0.0783 (4) | 0.0361 (2) | 0.0339 (2) | −0.0070 (3) | 0.0209 (2) | 0.0013 (2) |
O1 | 0.0530 (8) | 0.0247 (6) | 0.0402 (7) | −0.0058 (6) | 0.0177 (6) | −0.0053 (6) |
O2 | 0.0828 (11) | 0.0376 (8) | 0.0353 (7) | −0.0184 (7) | 0.0311 (7) | −0.0053 (6) |
O3 | 0.0928 (12) | 0.0438 (9) | 0.0322 (7) | −0.0064 (8) | 0.0231 (8) | −0.0007 (7) |
N1 | 0.0354 (7) | 0.0231 (7) | 0.0269 (7) | −0.0014 (6) | 0.0120 (6) | 0.0022 (6) |
C1 | 0.0427 (10) | 0.0236 (8) | 0.0313 (9) | −0.0004 (7) | 0.0111 (7) | 0.0065 (7) |
C2 | 0.0415 (10) | 0.0274 (8) | 0.0249 (8) | 0.0019 (7) | 0.0116 (7) | 0.0006 (7) |
C3 | 0.0514 (12) | 0.0373 (10) | 0.0329 (10) | 0.0028 (9) | 0.0121 (9) | 0.0067 (8) |
C4 | 0.0530 (13) | 0.0483 (12) | 0.0370 (10) | 0.0094 (10) | 0.0050 (9) | 0.0085 (10) |
C5 | 0.0384 (10) | 0.0502 (12) | 0.0391 (10) | 0.0028 (9) | 0.0061 (8) | −0.0071 (9) |
C6 | 0.0408 (10) | 0.0375 (10) | 0.0324 (9) | −0.0053 (8) | 0.0119 (8) | −0.0057 (8) |
C7 | 0.0404 (9) | 0.0276 (9) | 0.0231 (8) | 0.0001 (7) | 0.0111 (7) | −0.0032 (7) |
C8 | 0.0379 (9) | 0.0232 (8) | 0.0293 (8) | −0.0051 (7) | 0.0092 (7) | −0.0001 (7) |
C9 | 0.0351 (9) | 0.0181 (7) | 0.0281 (8) | −0.0011 (7) | 0.0100 (7) | 0.0030 (7) |
C10 | 0.0367 (9) | 0.0223 (8) | 0.0274 (8) | −0.0004 (7) | 0.0086 (7) | 0.0015 (7) |
C11 | 0.0369 (10) | 0.0309 (9) | 0.0406 (10) | −0.0051 (8) | 0.0154 (8) | 0.0026 (8) |
C12 | 0.0312 (9) | 0.0319 (9) | 0.0422 (9) | −0.0031 (7) | 0.0150 (7) | 0.0035 (8) |
C13 | 0.0399 (10) | 0.0397 (10) | 0.0492 (10) | 0.0035 (9) | 0.0220 (8) | −0.0013 (11) |
C14 | 0.0511 (13) | 0.0396 (11) | 0.0771 (16) | 0.0143 (10) | 0.0360 (12) | 0.0076 (11) |
C15 | 0.0482 (13) | 0.0631 (15) | 0.0600 (14) | 0.0194 (11) | 0.0256 (11) | 0.0236 (12) |
C16 | 0.0491 (12) | 0.0586 (14) | 0.0448 (12) | 0.0056 (10) | 0.0135 (10) | 0.0106 (11) |
C17 | 0.0430 (11) | 0.0393 (11) | 0.0428 (10) | −0.0021 (9) | 0.0138 (9) | −0.0004 (9) |
O1—C10 | 1.205 (2) | C6—H6 | 0.9500 |
O2—C10 | 1.310 (2) | C7—C8 | 1.509 (2) |
O2—H2 | 0.961 (10) | C8—C9 | 1.527 (2) |
O3—H3A | 0.957 (10) | C8—H8A | 0.9900 |
O3—H3B | 0.963 (10) | C8—H8B | 0.9900 |
N1—C9 | 1.502 (2) | C9—C10 | 1.516 (2) |
N1—C1 | 1.504 (2) | C9—H9 | 1.0000 |
N1—C11 | 1.516 (2) | C11—C12 | 1.500 (3) |
N1—H1 | 0.965 (9) | C11—H11A | 0.9900 |
C1—C2 | 1.502 (3) | C11—H11B | 0.9900 |
C1—H1A | 0.9900 | C12—C13 | 1.390 (3) |
C1—H1B | 0.9900 | C12—C17 | 1.392 (3) |
C2—C3 | 1.392 (2) | C13—C14 | 1.386 (3) |
C2—C7 | 1.394 (2) | C13—H13 | 0.9500 |
C3—C4 | 1.379 (3) | C14—C15 | 1.382 (3) |
C3—H3 | 0.9500 | C14—H14 | 0.9500 |
C4—C5 | 1.388 (3) | C15—C16 | 1.371 (3) |
C4—H4 | 0.9500 | C15—H15 | 0.9500 |
C5—C6 | 1.382 (3) | C16—C17 | 1.388 (3) |
C5—H5 | 0.9500 | C16—H16 | 0.9500 |
C6—C7 | 1.388 (2) | C17—H17 | 0.9500 |
C10—O2—H2 | 110.4 (19) | C9—C8—H8B | 108.7 |
H3A—O3—H3B | 106 (2) | H8A—C8—H8B | 107.6 |
C9—N1—C1 | 113.50 (13) | N1—C9—C10 | 112.63 (13) |
C9—N1—C11 | 116.00 (13) | N1—C9—C8 | 108.58 (13) |
C1—N1—C11 | 109.44 (13) | C10—C9—C8 | 114.61 (14) |
C9—N1—H1 | 107.3 (12) | N1—C9—H9 | 106.9 |
C1—N1—H1 | 103.3 (12) | C10—C9—H9 | 106.9 |
C11—N1—H1 | 106.2 (11) | C8—C9—H9 | 106.9 |
C2—C1—N1 | 112.18 (13) | O1—C10—O2 | 125.28 (17) |
C2—C1—H1A | 109.2 | O1—C10—C9 | 124.90 (16) |
N1—C1—H1A | 109.2 | O2—C10—C9 | 109.79 (14) |
C2—C1—H1B | 109.2 | C12—C11—N1 | 113.61 (14) |
N1—C1—H1B | 109.2 | C12—C11—H11A | 108.8 |
H1A—C1—H1B | 107.9 | N1—C11—H11A | 108.8 |
C3—C2—C7 | 119.88 (17) | C12—C11—H11B | 108.8 |
C3—C2—C1 | 118.13 (15) | N1—C11—H11B | 108.8 |
C7—C2—C1 | 121.95 (15) | H11A—C11—H11B | 107.7 |
C4—C3—C2 | 120.48 (18) | C13—C12—C17 | 118.93 (18) |
C4—C3—H3 | 119.8 | C13—C12—C11 | 121.11 (17) |
C2—C3—H3 | 119.8 | C17—C12—C11 | 119.95 (17) |
C3—C4—C5 | 119.98 (18) | C14—C13—C12 | 120.24 (19) |
C3—C4—H4 | 120.0 | C14—C13—H13 | 119.9 |
C5—C4—H4 | 120.0 | C12—C13—H13 | 119.9 |
C6—C5—C4 | 119.49 (18) | C15—C14—C13 | 120.1 (2) |
C6—C5—H5 | 120.3 | C15—C14—H14 | 120.0 |
C4—C5—H5 | 120.3 | C13—C14—H14 | 120.0 |
C5—C6—C7 | 121.30 (18) | C16—C15—C14 | 120.3 (2) |
C5—C6—H6 | 119.4 | C16—C15—H15 | 119.8 |
C7—C6—H6 | 119.4 | C14—C15—H15 | 119.8 |
C6—C7—C2 | 118.85 (16) | C15—C16—C17 | 119.9 (2) |
C6—C7—C8 | 120.32 (15) | C15—C16—H16 | 120.0 |
C2—C7—C8 | 120.78 (16) | C17—C16—H16 | 120.0 |
C7—C8—C9 | 114.30 (14) | C16—C17—C12 | 120.5 (2) |
C7—C8—H8A | 108.7 | C16—C17—H17 | 119.8 |
C9—C8—H8A | 108.7 | C12—C17—H17 | 119.8 |
C7—C8—H8B | 108.7 | ||
C9—N1—C1—C2 | 47.47 (18) | C11—N1—C9—C8 | 170.53 (14) |
C11—N1—C1—C2 | 178.80 (14) | C7—C8—C9—N1 | 46.10 (19) |
N1—C1—C2—C3 | 163.47 (15) | C7—C8—C9—C10 | −80.80 (18) |
N1—C1—C2—C7 | −18.8 (2) | N1—C9—C10—O1 | 1.5 (2) |
C7—C2—C3—C4 | −1.3 (3) | C8—C9—C10—O1 | 126.28 (19) |
C1—C2—C3—C4 | 176.48 (18) | N1—C9—C10—O2 | 179.67 (14) |
C2—C3—C4—C5 | 1.1 (3) | C8—C9—C10—O2 | −55.54 (19) |
C3—C4—C5—C6 | −0.7 (3) | C9—N1—C11—C12 | −37.9 (2) |
C4—C5—C6—C7 | 0.5 (3) | C1—N1—C11—C12 | −167.86 (14) |
C5—C6—C7—C2 | −0.7 (3) | N1—C11—C12—C13 | −65.2 (2) |
C5—C6—C7—C8 | 176.86 (17) | N1—C11—C12—C17 | 115.34 (18) |
C3—C2—C7—C6 | 1.1 (2) | C17—C12—C13—C14 | 0.0 (3) |
C1—C2—C7—C6 | −176.63 (16) | C11—C12—C13—C14 | −179.48 (18) |
C3—C2—C7—C8 | −176.46 (16) | C12—C13—C14—C15 | 1.0 (3) |
C1—C2—C7—C8 | 5.9 (2) | C13—C14—C15—C16 | −0.8 (3) |
C6—C7—C8—C9 | 162.44 (15) | C14—C15—C16—C17 | −0.3 (3) |
C2—C7—C8—C9 | −20.1 (2) | C15—C16—C17—C12 | 1.3 (3) |
C1—N1—C9—C10 | 66.57 (17) | C13—C12—C17—C16 | −1.1 (3) |
C11—N1—C9—C10 | −61.44 (18) | C11—C12—C17—C16 | 178.37 (18) |
C1—N1—C9—C8 | −61.46 (17) |
Cg is the centroid of the C12–C17 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···Cl1i | 0.97 (2) | 2.09 (2) | 3.0521 (15) | 176 (1) |
O2—H2···O3ii | 0.96 (2) | 1.59 (2) | 2.533 (2) | 167 (3) |
O3—H3A···Cl1i | 0.96 (2) | 2.21 (2) | 3.1615 (15) | 172 (2) |
O3—H3B···Cl1 | 0.96 (2) | 2.20 (2) | 3.1434 (16) | 165 (2) |
C9—H9···O1iii | 1.00 | 2.30 | 3.169 (2) | 145 |
C15—H15···Cgiii | 0.95 | 2.78 | 3.386 (3) | 122 |
Symmetry codes: (i) −x+1, y+1/2, −z+1; (ii) x, y, z−1; (iii) −x+1, y+1/2, −z. |
Experimental details
Crystal data | |
Chemical formula | C17H18NO2+·Cl−·H2O |
Mr | 321.79 |
Crystal system, space group | Monoclinic, P21 |
Temperature (K) | 193 |
a, b, c (Å) | 8.6159 (8), 10.0670 (9), 10.1392 (9) |
β (°) | 108.686 (2) |
V (Å3) | 833.08 (13) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.24 |
Crystal size (mm) | 0.30 × 0.11 × 0.02 |
Data collection | |
Diffractometer | Bruker Kappa DUO APEXII |
Absorption correction | Multi-scan (SADABS; Sheldrick, 2008a |
Tmin, Tmax | 0.931, 0.995 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 9083, 4158, 3414 |
Rint | 0.024 |
(sin θ/λ)max (Å−1) | 0.667 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.036, 0.082, 1.04 |
No. of reflections | 4158 |
No. of parameters | 213 |
No. of restraints | 5 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.19, −0.16 |
Absolute structure | Flack (1983), 1961 Friedel pairs |
Absolute structure parameter | −0.01 (5) |
Computer programs: APEX2 (Bruker, 2006), SAINT (Bruker, 2006), SHELXS97 (Sheldrick, 2008b), SHELXL97 (Sheldrick, 2008b), OLEX2 (Dolomanov et al., 2009).
Cg is the centroid of the C12–C17 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···Cl1i | 0.965 (15) | 2.089 (15) | 3.0521 (15) | 175.9 (14) |
O2—H2···O3ii | 0.96 (2) | 1.59 (2) | 2.533 (2) | 167 (3) |
O3—H3A···Cl1i | 0.961 (19) | 2.207 (19) | 3.1615 (15) | 172 (2) |
O3—H3B···Cl1 | 0.963 (19) | 2.204 (18) | 3.1434 (16) | 165 (2) |
C9—H9···O1iii | 1.00 | 2.30 | 3.169 (2) | 145 |
C15—H15···Cgiii | 0.95 | 2.78 | 3.386 (3) | 122 |
Symmetry codes: (i) −x+1, y+1/2, −z+1; (ii) x, y, z−1; (iii) −x+1, y+1/2, −z. |
Acknowledgements
The authors wish to thank Dr Hong Su of the Chemistry Department of the University of Cape Town for her assistance with the crystallographic 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.
The tetrahydroisoquinoline (TIQ) molecule and its derivatives have been widely investigated due to their biological and pharmaceutical properties. We have recently had much success with TIQ based ligands for both metal ligand (Peters et al., 2010) and organocatalysis (Naicker, Petzold et al., 2010). Bearing an acid functional group, the title compound is a useful precursor to many of these novel asymmetric catalysts. The neutral form of this compound is commercially available but there has been no report of its single X-ray crystal structure.
The structure has monoclinic (P21) symmetry with a single molecule in the asymmetric unit together with a water molecule (Fig. 1). Various intra- and intermolecular short contact interactions (2.87–3.14 Å) occur but only one C15—H···π (C12—C17 ring) is observed within the crystal packing (Table 1). The most significant feature of the structure is the intermolecular hydrogen bonding array. The carboxylic acid functional group (O2—H) hydrogen bonds to the water molecule which in turn interacts with two chloride ions. These ions interact further with another water molecule but also with the protonated tertiary amine nitrogen. This series of interactions helps to construct the three-dimensional network (Fig. 2 and Table 1).
From the crystal structure it is evident that the N-containing six membered ring assumes a half boat conformation (Fig. 1), this observation is similar to analogous structures that we have recently reported (Naicker et al., 2009; Naicker, Govender et al., 2010).