organic compounds
N-Methyl-L-leucyl-L-leucine hydrochloride monohydrate
aDepartment of Chemistry, Jinan University, Guangzhou 510632, People's Republic of China, and bGuangdong Guangya High School, Guangdong 510160, People's Republic of China
*Correspondence e-mail: txush@jnu.edu.cn
In the title compound C13H27N2O3+·Cl−·H2O, obtained by deprotecting the amino and carboxyl groups of an intermediate in the synthesis of the cyclic pentapeptide Galaxamide, a number of hydrogen-bonding interactions occur including aminium N—H⋯Cl, amide–carboxyl N—H⋯O, water O—H⋯Cl and carboxyl–water O—H⋯O associations. The aminium N—H⋯Cl⋯H—N bridging extensions give rise to zigzag chains extending along the a axis, the overall two-dimensional structure lying in the (110) plane.
Related literature
For general background to ). For the synthesis of Galaxamide, see: Xu, Liao, Xu et al. (2008); Rodriguez et al. (2007). For related structures, see: Liao et al. (2007); Xu, Liao, Diao et al. (2008).
see: Humphrey & Chamberlin (1997Experimental
Crystal data
|
Data collection: CrysAlis PRO (Agilent, 2011); cell CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: OLEX2 (Dolomanov et al., 2009); software used to prepare material for publication: OLEX2.
Supporting information
10.1107/S1600536811031126/zs2126sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536811031126/zs2126Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536811031126/zs2126Isup3.cml
Diisopropylethylamine (DIPEA) (6 mmol, 1.1 ml) was added dropwise to a stirred solution of L-leucine benzyl ester p-toluenesulfonate (6 mmol, 2.36 g) in anhydrous THF (8 ml) at 273 K under nitrogen and stirred for 15 min. The coupling reagent DEPBT (6 mmol, 1.8 g) was added to a stirred solution of N-Boc-Me—L-Leu-OH (5 mmol, 1.30 g) in anhydrous THF (5 ml) at 273 K under nitrogen and the suspension was stirred for 15 min. A suspension of L-leucine benzyl ester p-toluenesulfonate was added by cannula to the N-Boc-Me—L-Leu-OH suspension at 273 K under nitrogen and the mixture was allowed to warm to room temperature over the course of 24 h, then evaporated in vacuo. The crude product was then purified by
on silica using n-hexane/acetone (20:1) as to give the dipeptide as colorless crystals (yield 2.1g: 92.5%). This dipeptide (4 mmol, 1.8 g) was dissolved in CH2Cl2 (7 ml) and 2 ml of TFA was added dropwise at 273 K under nitrogen using a constant pressure funnel. The mixture was stirred at 273 K until the starting material disappeared (monitored by TLC). The solution was concentrated in vacuo, the residue was dissolved in CH2Cl22 and concentrated again to remove the Boc dipeptide derivative which was dried in vacuo. This Boc derivative (3 mmol, 1.91 g) was reduced with hydrogen (0.1 Mpa) and 10% Pd—C (0.62 g) in ethyl acetate (40 ml) until the starting material disappeared (monitored using TLC). The Pd—C was filtered, and the filtrate was concentrated in vacuo to obtain the title compound (yield 1.85 g: 97%). Colourless crystals suitable for X-ray analysis grew over a period of a week from a solution in methanol containing a small amount of dilute HCl, when exposed to air.The C-bound and O-bound H atoms were positioned geometrically and were included in the
in the riding-model approximation, with distances 0.96 Å (CH3), 0.97 Å (CH2), 0.98 (CH), or 0.85 Å (OH) and Uiso(H) = 1.2Ueq(C, O) for methine, methylene, hydroxyl and carboxyl H atoms, and Uiso = 1.5Ueq(C) for methyl H atoms. The N H-atoms were located in a difference-Fourier synthesis and then refined as riding on the N atoms with Uiso(H) = 1.2Ueq(N). The known S for L-leucine [(S)-2-amino-4-methylvaleric acid] was invoked for both chiral centres in the title molecule (C1S,C3S).Data collection: CrysAlis PRO (Agilent, 2011); cell
CrysAlis PRO (Agilent, 2011); data reduction: CrysAlis PRO (Agilent, 2011); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: OLEX2 (Dolomanov et al., 2009); software used to prepare material for publication: OLEX2 (Dolomanov et al., 2009).Fig. 1. The molecular structure of the title compound showing the atom numbering scheme. Inter-species hydrogen bonds are shown as dashed lines and displacement ellipsoids are drawn at the 50% probability level. | |
Fig. 2. Fgure 2. A perspective view of the packing in the unit cell showing the hydrogen-bonding interactions as dashed lines. |
C13H27N2O3+·Cl−·H2O | F(000) = 340 |
Mr = 312.83 | Dx = 1.133 Mg m−3 |
Monoclinic, P21 | Mo Kα radiation, λ = 0.7107 Å |
a = 5.2212 (2) Å | Cell parameters from 1351 reflections |
b = 9.6032 (5) Å | θ = 3.1–29.1° |
c = 18.4081 (8) Å | µ = 0.22 mm−1 |
β = 96.329 (4)° | T = 295 K |
V = 917.36 (7) Å3 | Block, colourless |
Z = 2 | 0.45 × 0.32 × 0.17 mm |
Oxford Diffraction Xcalibur Sapphire3 Gemini Ultra CCD diffractometer | 2616 independent reflections |
Radiation source: Enhance (Mo) X-ray Source | 2271 reflections with I > 2s˘I) |
Graphite monochromator | Rint = 0.015 |
Detector resolution: 16.0288 pixels mm-1 | θmax = 26.0°, θmin = 3.1° |
ω scans | h = −6→6 |
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2011) | k = −7→11 |
Tmin = 0.990, Tmax = 1.000 | l = −19→22 |
3703 measured reflections |
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)] = 0.042 | H-atom parameters constrained |
wR(F2) = 0.114 | w = 1/[σ2(Fo2) + (0.065P)2 + 0.1023P] where P = (Fo2 + 2Fc2)/3 |
S = 1.01 | (Δ/σ)max = 0.001 |
2616 reflections | Δρmax = 0.37 e Å−3 |
186 parameters | Δρmin = −0.22 e Å−3 |
1 restraint | Absolute structure: Flack (1983), 686 Friedel pairs |
Primary atom site location: structure-invariant direct methods | Absolute structure parameter: −0.01 (8) |
C13H27N2O3+·Cl−·H2O | V = 917.36 (7) Å3 |
Mr = 312.83 | Z = 2 |
Monoclinic, P21 | Mo Kα radiation |
a = 5.2212 (2) Å | µ = 0.22 mm−1 |
b = 9.6032 (5) Å | T = 295 K |
c = 18.4081 (8) Å | 0.45 × 0.32 × 0.17 mm |
β = 96.329 (4)° |
Oxford Diffraction Xcalibur Sapphire3 Gemini Ultra CCD diffractometer | 2616 independent reflections |
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2011) | 2271 reflections with I > 2s˘I) |
Tmin = 0.990, Tmax = 1.000 | Rint = 0.015 |
3703 measured reflections |
R[F2 > 2σ(F2)] = 0.042 | H-atom parameters constrained |
wR(F2) = 0.114 | Δρmax = 0.37 e Å−3 |
S = 1.01 | Δρmin = −0.22 e Å−3 |
2616 reflections | Absolute structure: Flack (1983), 686 Friedel pairs |
186 parameters | Absolute structure parameter: −0.01 (8) |
1 restraint |
Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell esds are taken into account in the estimation of distances, angles and torsion angles |
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 | 0.9159 (3) | 0.8611 (2) | 0.21026 (11) | 0.0456 (7) | |
O2 | 1.1446 (4) | 1.1632 (3) | 0.27116 (12) | 0.0647 (9) | |
O3 | 0.8114 (4) | 1.1739 (3) | 0.18571 (12) | 0.0609 (8) | |
N1 | 0.5270 (4) | 0.7595 (3) | 0.09916 (12) | 0.0467 (8) | |
N2 | 0.5803 (4) | 0.9650 (3) | 0.25512 (13) | 0.0422 (8) | |
C1 | 0.4995 (5) | 0.7609 (3) | 0.17896 (15) | 0.0407 (9) | |
C2 | 0.6837 (5) | 0.8673 (3) | 0.21552 (14) | 0.0376 (8) | |
C3 | 0.7383 (5) | 1.0686 (3) | 0.29656 (15) | 0.0429 (9) | |
C4 | 0.9252 (5) | 1.1384 (3) | 0.24936 (15) | 0.0451 (9) | |
C5 | 0.5595 (5) | 0.6146 (4) | 0.20897 (15) | 0.0460 (8) | |
C6 | 0.8781 (6) | 1.0087 (4) | 0.36714 (16) | 0.0538 (10) | |
C7 | 0.5536 (5) | 0.5991 (4) | 0.29136 (15) | 0.0477 (9) | |
C8 | 0.7036 (7) | 0.9642 (5) | 0.42373 (18) | 0.0648 (13) | |
C9 | 0.6292 (8) | 0.4502 (4) | 0.3139 (2) | 0.0718 (14) | |
C10 | 0.2924 (7) | 0.6351 (6) | 0.3153 (2) | 0.0761 (14) | |
C11 | 0.8619 (12) | 0.8836 (9) | 0.4839 (3) | 0.124 (3) | |
C12 | 0.5709 (8) | 1.0854 (7) | 0.4543 (2) | 0.0883 (19) | |
C13 | 0.4878 (8) | 0.8963 (5) | 0.06236 (19) | 0.0701 (14) | |
O4 | 1.0969 (8) | 1.2934 (4) | 0.09741 (19) | 0.1200 (16) | |
Cl1 | 0.01614 (13) | 0.60884 (9) | 0.04716 (4) | 0.0580 (3) | |
H1 | 0.32240 | 0.78610 | 0.18640 | 0.0490* | |
H1A | 0.68570 | 0.72850 | 0.09280 | 0.0560* | |
H1B | 0.41260 | 0.69860 | 0.07710 | 0.0560* | |
H2 | 0.41610 | 0.96640 | 0.25610 | 0.0510* | |
H3 | 0.62160 | 1.14120 | 0.31070 | 0.0520* | |
H3A | 0.90570 | 1.21190 | 0.15680 | 0.0730* | |
H5A | 0.43590 | 0.55010 | 0.18430 | 0.0550* | |
H5B | 0.72900 | 0.58780 | 0.19700 | 0.0550* | |
H6A | 0.97830 | 0.92880 | 0.35480 | 0.0640* | |
H6B | 0.99780 | 1.07820 | 0.38890 | 0.0640* | |
H7 | 0.68190 | 0.66260 | 0.31610 | 0.0570* | |
H8 | 0.57160 | 0.90170 | 0.40000 | 0.0780* | |
H9A | 0.50160 | 0.38660 | 0.29190 | 0.1070* | |
H9B | 0.64010 | 0.44200 | 0.36620 | 0.1070* | |
H9C | 0.79340 | 0.42830 | 0.29790 | 0.1070* | |
H10A | 0.24780 | 0.72890 | 0.30110 | 0.1140* | |
H10B | 0.29980 | 0.62660 | 0.36750 | 0.1140* | |
H10C | 0.16460 | 0.57240 | 0.29260 | 0.1140* | |
H11A | 0.94290 | 0.80570 | 0.46310 | 0.1850* | |
H11B | 0.75120 | 0.85070 | 0.51860 | 0.1850* | |
H11C | 0.99160 | 0.94350 | 0.50820 | 0.1850* | |
H12A | 0.69730 | 1.14720 | 0.47860 | 0.1330* | |
H12B | 0.45900 | 1.05260 | 0.48870 | 0.1330* | |
H12C | 0.47140 | 1.13420 | 0.41540 | 0.1330* | |
H13A | 0.50050 | 0.88560 | 0.01100 | 0.1050* | |
H13B | 0.61720 | 0.96040 | 0.08280 | 0.1050* | |
H13C | 0.32020 | 0.93160 | 0.06940 | 0.1050* | |
H4A | 1.14740 | 1.23240 | 0.06880 | 0.1440* | |
H4B | 1.01050 | 1.35560 | 0.07270 | 0.1440* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0316 (9) | 0.0457 (13) | 0.0607 (12) | 0.0060 (9) | 0.0102 (8) | −0.0027 (11) |
O2 | 0.0421 (11) | 0.0755 (19) | 0.0769 (14) | −0.0069 (12) | 0.0078 (10) | 0.0094 (14) |
O3 | 0.0645 (13) | 0.0608 (16) | 0.0567 (12) | −0.0036 (13) | 0.0038 (11) | 0.0162 (12) |
N1 | 0.0420 (12) | 0.0530 (17) | 0.0443 (13) | −0.0020 (12) | 0.0011 (10) | 0.0028 (12) |
N2 | 0.0325 (11) | 0.0422 (15) | 0.0526 (13) | 0.0089 (11) | 0.0075 (10) | 0.0002 (12) |
C1 | 0.0340 (12) | 0.0426 (17) | 0.0462 (15) | 0.0045 (13) | 0.0077 (11) | 0.0011 (14) |
C2 | 0.0342 (12) | 0.0355 (16) | 0.0434 (14) | 0.0058 (13) | 0.0059 (11) | 0.0057 (13) |
C3 | 0.0397 (13) | 0.0399 (18) | 0.0499 (15) | 0.0089 (13) | 0.0081 (12) | −0.0017 (13) |
C4 | 0.0446 (15) | 0.0358 (18) | 0.0555 (16) | 0.0064 (14) | 0.0083 (13) | 0.0016 (14) |
C5 | 0.0427 (13) | 0.0393 (16) | 0.0551 (15) | −0.0006 (15) | 0.0019 (11) | 0.0009 (16) |
C6 | 0.0487 (16) | 0.062 (2) | 0.0497 (17) | 0.0062 (16) | 0.0009 (13) | 0.0009 (16) |
C7 | 0.0475 (14) | 0.0412 (17) | 0.0535 (15) | 0.0020 (16) | 0.0022 (12) | 0.0052 (16) |
C8 | 0.073 (2) | 0.071 (3) | 0.0502 (17) | −0.022 (2) | 0.0056 (16) | 0.0017 (18) |
C9 | 0.076 (2) | 0.050 (2) | 0.088 (3) | 0.004 (2) | 0.003 (2) | 0.018 (2) |
C10 | 0.0628 (19) | 0.092 (3) | 0.077 (2) | 0.008 (2) | 0.0236 (17) | 0.025 (3) |
C11 | 0.151 (5) | 0.144 (6) | 0.077 (3) | 0.009 (5) | 0.018 (3) | 0.054 (4) |
C12 | 0.079 (2) | 0.130 (5) | 0.060 (2) | −0.009 (3) | 0.0255 (18) | −0.015 (3) |
C13 | 0.078 (2) | 0.071 (3) | 0.059 (2) | −0.003 (2) | −0.0021 (18) | 0.018 (2) |
O4 | 0.165 (3) | 0.099 (3) | 0.099 (2) | −0.003 (3) | 0.028 (2) | 0.015 (2) |
Cl1 | 0.0507 (4) | 0.0606 (5) | 0.0630 (4) | −0.0075 (4) | 0.0081 (3) | −0.0114 (5) |
O1—C2 | 1.228 (3) | C1—H1 | 0.9800 |
O2—C4 | 1.195 (3) | C3—H3 | 0.9800 |
O3—C4 | 1.300 (4) | C5—H5B | 0.9700 |
O3—H3A | 0.8500 | C5—H5A | 0.9700 |
O4—H4B | 0.8500 | C6—H6A | 0.9700 |
O4—H4A | 0.8500 | C6—H6B | 0.9700 |
N1—C13 | 1.482 (5) | C7—H7 | 0.9800 |
N1—C1 | 1.492 (4) | C8—H8 | 0.9800 |
N2—C2 | 1.338 (4) | C9—H9C | 0.9600 |
N2—C3 | 1.454 (4) | C9—H9B | 0.9600 |
N1—H1A | 0.9000 | C9—H9A | 0.9600 |
N1—H1B | 0.9000 | C10—H10B | 0.9600 |
N2—H2 | 0.8600 | C10—H10A | 0.9600 |
C1—C5 | 1.529 (5) | C10—H10C | 0.9600 |
C1—C2 | 1.510 (4) | C11—H11B | 0.9600 |
C3—C4 | 1.531 (4) | C11—H11A | 0.9600 |
C3—C6 | 1.531 (4) | C11—H11C | 0.9600 |
C5—C7 | 1.528 (4) | C12—H12B | 0.9600 |
C6—C8 | 1.519 (5) | C12—H12C | 0.9600 |
C7—C10 | 1.519 (5) | C12—H12A | 0.9600 |
C7—C9 | 1.529 (5) | C13—H13C | 0.9600 |
C8—C12 | 1.496 (7) | C13—H13A | 0.9600 |
C8—C11 | 1.519 (8) | C13—H13B | 0.9600 |
C4—O3—H3A | 116.00 | C3—C6—H6B | 108.00 |
H4A—O4—H4B | 110.00 | C8—C6—H6A | 109.00 |
C1—N1—C13 | 114.8 (3) | C3—C6—H6A | 109.00 |
C2—N2—C3 | 121.7 (2) | H6A—C6—H6B | 108.00 |
C1—N1—H1B | 109.00 | C8—C6—H6B | 109.00 |
C13—N1—H1A | 108.00 | C5—C7—H7 | 108.00 |
H1A—N1—H1B | 108.00 | C9—C7—H7 | 108.00 |
C1—N1—H1A | 109.00 | C10—C7—H7 | 108.00 |
C13—N1—H1B | 109.00 | C6—C8—H8 | 108.00 |
C2—N2—H2 | 119.00 | C11—C8—H8 | 108.00 |
C3—N2—H2 | 119.00 | C12—C8—H8 | 108.00 |
N1—C1—C2 | 108.6 (2) | C7—C9—H9B | 109.00 |
N1—C1—C5 | 108.0 (2) | C7—C9—H9C | 110.00 |
C2—C1—C5 | 111.5 (2) | H9A—C9—H9B | 109.00 |
O1—C2—C1 | 121.2 (2) | H9A—C9—H9C | 109.00 |
N2—C2—C1 | 116.2 (2) | H9B—C9—H9C | 109.00 |
O1—C2—N2 | 122.6 (3) | C7—C9—H9A | 110.00 |
N2—C3—C6 | 112.2 (3) | C7—C10—H10A | 109.00 |
C4—C3—C6 | 111.9 (2) | C7—C10—H10B | 109.00 |
N2—C3—C4 | 111.2 (2) | H10A—C10—H10B | 110.00 |
O2—C4—C3 | 123.0 (3) | H10A—C10—H10C | 110.00 |
O3—C4—C3 | 111.7 (2) | H10B—C10—H10C | 109.00 |
O2—C4—O3 | 125.2 (3) | C7—C10—H10C | 110.00 |
C1—C5—C7 | 115.0 (3) | C8—C11—H11B | 109.00 |
C3—C6—C8 | 115.0 (3) | C8—C11—H11C | 109.00 |
C5—C7—C10 | 112.5 (2) | C8—C11—H11A | 110.00 |
C9—C7—C10 | 110.3 (3) | H11A—C11—H11C | 109.00 |
C5—C7—C9 | 109.1 (3) | H11B—C11—H11C | 109.00 |
C6—C8—C12 | 112.1 (4) | H11A—C11—H11B | 109.00 |
C11—C8—C12 | 111.1 (4) | C8—C12—H12A | 109.00 |
C6—C8—C11 | 108.9 (3) | C8—C12—H12B | 109.00 |
C2—C1—H1 | 110.00 | H12A—C12—H12B | 109.00 |
C5—C1—H1 | 110.00 | H12A—C12—H12C | 109.00 |
N1—C1—H1 | 110.00 | C8—C12—H12C | 110.00 |
C4—C3—H3 | 107.00 | H12B—C12—H12C | 109.00 |
C6—C3—H3 | 107.00 | N1—C13—H13B | 109.00 |
N2—C3—H3 | 107.00 | N1—C13—H13C | 109.00 |
C1—C5—H5B | 109.00 | N1—C13—H13A | 110.00 |
C7—C5—H5A | 108.00 | H13A—C13—H13C | 109.00 |
C7—C5—H5B | 109.00 | H13B—C13—H13C | 109.00 |
H5A—C5—H5B | 107.00 | H13A—C13—H13B | 109.00 |
C1—C5—H5A | 109.00 | ||
C13—N1—C1—C2 | −56.0 (3) | C2—C1—C5—C7 | 57.8 (3) |
C13—N1—C1—C5 | −177.1 (2) | N2—C3—C4—O2 | −138.2 (3) |
C3—N2—C2—O1 | −1.8 (4) | N2—C3—C4—O3 | 45.8 (3) |
C3—N2—C2—C1 | 176.3 (2) | C6—C3—C4—O2 | −11.8 (4) |
C2—N2—C3—C4 | 49.6 (3) | C6—C3—C4—O3 | 172.1 (3) |
C2—N2—C3—C6 | −76.5 (3) | N2—C3—C6—C8 | −66.0 (4) |
N1—C1—C2—O1 | −56.6 (3) | C4—C3—C6—C8 | 168.1 (3) |
N1—C1—C2—N2 | 125.2 (3) | C1—C5—C7—C9 | −177.4 (3) |
C5—C1—C2—O1 | 62.3 (3) | C1—C5—C7—C10 | 59.8 (4) |
C5—C1—C2—N2 | −115.9 (3) | C3—C6—C8—C11 | 169.8 (4) |
N1—C1—C5—C7 | 177.1 (2) | C3—C6—C8—C12 | −66.9 (4) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1A···Cl1i | 0.90 | 2.31 | 3.174 (2) | 161 |
N1—H1B···Cl1 | 0.90 | 2.25 | 3.092 (2) | 155 |
N2—H2···O2ii | 0.86 | 2.40 | 3.006 (3) | 128 |
O3—H3A···O4 | 0.85 | 1.74 | 2.591 (5) | 179 |
O4—H4A···Cl1iii | 0.85 | 2.51 | 3.198 (4) | 139 |
O4—H4B···Cl1iv | 0.85 | 2.48 | 3.182 (4) | 141 |
C1—H1···O1ii | 0.98 | 2.33 | 3.306 (3) | 175 |
C3—H3···O2ii | 0.98 | 2.53 | 3.215 (3) | 127 |
Symmetry codes: (i) x+1, y, z; (ii) x−1, y, z; (iii) −x+1, y+1/2, −z; (iv) x+1, y+1, z. |
Experimental details
Crystal data | |
Chemical formula | C13H27N2O3+·Cl−·H2O |
Mr | 312.83 |
Crystal system, space group | Monoclinic, P21 |
Temperature (K) | 295 |
a, b, c (Å) | 5.2212 (2), 9.6032 (5), 18.4081 (8) |
β (°) | 96.329 (4) |
V (Å3) | 917.36 (7) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.22 |
Crystal size (mm) | 0.45 × 0.32 × 0.17 |
Data collection | |
Diffractometer | Oxford Diffraction Xcalibur Sapphire3 Gemini Ultra CCD diffractometer |
Absorption correction | Multi-scan (CrysAlis PRO; Agilent, 2011) |
Tmin, Tmax | 0.990, 1.000 |
No. of measured, independent and observed [I > 2s˘I)] reflections | 3703, 2616, 2271 |
Rint | 0.015 |
(sin θ/λ)max (Å−1) | 0.617 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.042, 0.114, 1.01 |
No. of reflections | 2616 |
No. of parameters | 186 |
No. of restraints | 1 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.37, −0.22 |
Absolute structure | Flack (1983), 686 Friedel pairs |
Absolute structure parameter | −0.01 (8) |
Computer programs: CrysAlis PRO (Agilent, 2011), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), OLEX2 (Dolomanov et al., 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1A···Cl1i | 0.90 | 2.31 | 3.174 (2) | 161 |
N1—H1B···Cl1 | 0.90 | 2.25 | 3.092 (2) | 155 |
N2—H2···O2ii | 0.86 | 2.40 | 3.006 (3) | 128 |
O3—H3A···O4 | 0.85 | 1.74 | 2.591 (5) | 179 |
O4—H4A···Cl1iii | 0.85 | 2.51 | 3.198 (4) | 139 |
O4—H4B···Cl1iv | 0.85 | 2.48 | 3.182 (4) | 141 |
Symmetry codes: (i) x+1, y, z; (ii) x−1, y, z; (iii) −x+1, y+1/2, −z; (iv) x+1, y+1, z. |
Acknowledgements
This work was supported by grants from the National High Technology Development Project (863 Project, No. 2006 A A09Z408), the National Natural Science Fund (No. 20772048), the Tianhe Science and Technology Plan Project (No. 104zh134), and the Fundamental Research Funds for the Central Universities (Nos. 21611412 and 21611382)
References
Agilent (2011). CrysAlis PRO. Agilent Technologies UK Ltd, Yarnton, England. Google Scholar
Dolomanov, O. V., Bourhis, L. J., Gildea, R. J., Howard, J. A. K. & Puschmann, H. (2009). J. Appl. Cryst. 42, 339–341. Web of Science CrossRef CAS IUCr Journals Google Scholar
Flack, H. D. (1983). Acta Cryst. A39, 876–881. CrossRef CAS Web of Science IUCr Journals Google Scholar
Humphrey, J. M. & Chamberlin, A. R. (1997). Chem. Rev. 97, 2243–2266. CrossRef PubMed CAS Web of Science Google Scholar
Liao, X.-J., Xu, W.-J., Xu, S.-H. & Dong, F.-F. (2007). Acta Cryst. E63, o3313. Web of Science CSD CrossRef IUCr Journals Google Scholar
Rodriguez, R. A., Pan, P. S., Pan, C. M., Ravula, S., Lapera, S., Singh, E. K., Styers, T. J., Brown, J. D., Cajica, J., Parry, E., Otrubova, K. & McAlpine, S. R. (2007). J. Org. Chem. 72, 1980–2002. CrossRef CAS Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Xu, W. J., Liao, X. J., Diao, J. Z., Zhou, L. & Xu, S. H. (2008). Acta Cryst. E64, o2178. CrossRef IUCr Journals Google Scholar
Xu, W.-J., Liao, X.-J., Xu, S.-H., Diao, J.-Z., Du, B., Zhou, X.-L. & Pan, S.-S. (2008). Org. Lett. 10, 4569–4572. Web of Science CrossRef PubMed CAS Google Scholar
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.
Peptide compounds play an important role in life activities (Humphrey & Chamberlin, 1997). The title compound C13H27N2O3+ Cl- . H2O (Fig. 1) is a modified dipeptide employed in the synthesis of the cytotoxic cyclic pentapeptide Galaxamide (Xu, Liao, Xu et al., 2008), obtained by deprotecting the amino and carboxyl groups of the intermediate (Rodriguez et al., 2007). The purpose was to explore the activity targets of the intermediates in relation to those of the target compound (Liao et al., 2007, Xu, Liao, Diao et al., 2008). In the crystal structure of the title compound, there are a number of intermolecular hydrogen-bonding interactions (Table 1), including aminium N—H···Cl, amide N—H···Ocarboxyl, water O—H···Cl and carboxylic acid O—H···Owater associations. The aminium N—H···Cl···H—N bridging extensions give zigzag chains extending along the a axis in the unit cell, the overall two-dimensional structure lying along (110) (Fig 2).