organic compounds
tert-Butyl N-((1S)-2-hydroxy-1-{N′-[(1E)-4-methoxybenzylidene]hydrazinecarbonyl}ethyl)carbamate
aFundação Oswaldo Cruz, Instituto de Tecnologia, em Fármacos – Farmanguinhos, R. Sizenando Nabuco, 100, Manguinhos, 21041-250 Rio de Janeiro, RJ, Brazil, bDepartment of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia, cCHEMSOL, 1 Harcourt Road, Aberdeen AB15 5NY, Scotland, and dCentro de Desenvolvimento Tecnológico em Saúde (CDTS), Fundação Oswaldo Cruz (FIOCRUZ), Casa Amarela, Campus de Manguinhos, Av. Brasil 4365, 21040-900 Rio de Janeiro, RJ, Brazil
*Correspondence e-mail: edward.tiekink@gmail.com
The molecule of the title compound, C16H23N3O5, is twisted about the chiral C atom, the dihedral angle formed between the amide residues being 79.6 (3)°. The conformation about the imine bond [1.278 (5) Å] is E. In the crystal, O—H⋯O and N—H⋯O hydrogen bonding between the hydroxy, amine and carbonyl groups leads to the formation of supramolecular layers, which stack along the c-axis direction.
Related literature
For background to the use of L-serine derivatives in anti-tumour therapy, see: Jiao et al. (2009); Yakura et al. (2007). For background to N-acylhydrazone derivatives from L-serine for anti-tumour testing, see: Pinheiro et al. (2010, 2011); de Souza et al. (2010); Howie et al. (2011).
Experimental
Crystal data
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Refinement
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Data collection: COLLECT (Hooft, 1998); cell DENZO (Otwinowski & Minor, 1997) and COLLECT; data reduction: DENZO and COLLECT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 2006); software used to prepare material for publication: publCIF (Westrip, 2010).
Supporting information
10.1107/S1600536811024263/hb5921sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536811024263/hb5921Isup2.hkl
A reaction mixture of (S)-t-BuOCONHCH(CH2OH)CONHNH2 (1.0 mmol), prepared from L-serine (Howie et al., 2011), and 4-methoxybenzaldehyde (1.05 mmol) in EtOH (10 ml) was refluxed for 4 h. The reaction mixture was rotary evaporated, and the residue was purified by washing with cold ethanol (3 x 10 ml): M.pt. 409 K, yield 80%. The solution NMR spectra in DMSO-d6 solution indicated the presence of both E and Z isomers. On recrystallization from EtOH for the δ (p.p.m.): 11.28 and 11.21 (1H, s, NHN, E & Z isomers), 8.17 and 7.92 (1H, s, N=CH, E & Z isomers), 7.63 (1H, s, H1 or H5), 7.61 (1H, s, H1 or H5), 7.00 (2H, m, H2 and H4), 6.73 (d, J= 7.4) and 6.58 (d, J= 8.6), (1H, NHCH, E & Z isomers)), 4.91 (m) and 4.76 (t, J= 6.6), (1H, OH, E & Z isomers)), 4.91 and 4.02 (1H, m, CH, E & Z isomers)), 3.80 (3H, s, CH3O), 3.70–3.50 (2H, m, CH2OH), 1.39 (9H, s, (CH3)3C–). 13C NMR (100 MHz, DMSO-d6) δ (p.p.m.): 171.3 and 166.9 (COCH, E & Z isomers), 160.7 and 160.6 (C3, E & Z isomers), 155.2 (COO), 146.6 and 143.0 (N=CH, E & Z isomers), 128.5 and 128.3 (C1 and C5), 126.8 (C6), 114.3 (C2 and C4), 78.2 and 78.0 ((CH3)3C–, E & Z isomers)), 61.6 and 61.2 (CH2OH, E & Z isomers), 56.0 and 54.0 (CH, E & Z isomers), 55.3 (CH3O), 28.1 ((CH3)3C). IR (cm-1, KBr): 3306 (O—H), 1697 (COCH), 1678 (COO). EM/ESI: [M—H]: 336.1.
only the E isomer was obtained. 1H NMR (400 MHz, DMSO-d6):The C-bound H atoms were geometrically placed (C–H = 0.95–1.00 Å) and refined as riding with Uiso(H) = 1.2–1.5Ueq(C). The O– and N-bound H atoms were located from a difference map and refined with the distance restraints O–H = 0.84 ± 0.01 and N–H = 0.88±0.01 Å, and with Uiso(H) = zUeq(carrier atom); z = 1.5 for O and z = 1.2 for N. In the absence of significant
effects, 1575 Friedel pairs were averaged in the final However, the was assigned on the basis of the of the L-serine starting material.Data collection: COLLECT (Hooft, 1998); cell
DENZO (Otwinowski & Minor, 1997) and COLLECT (Hooft, 1998); data reduction: DENZO (Otwinowski & Minor, 1997) and COLLECT (Hooft, 1998); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 2006); software used to prepare material for publication: publCIF (Westrip, 2010).C16H23N3O5 | Z = 1 |
Mr = 337.38 | F(000) = 180 |
Triclinic, P1 | Dx = 1.342 Mg m−3 |
Hall symbol: P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 5.3323 (4) Å | Cell parameters from 14323 reflections |
b = 5.7200 (4) Å | θ = 2.9–27.5° |
c = 14.3319 (10) Å | µ = 0.10 mm−1 |
α = 79.919 (4)° | T = 120 K |
β = 83.686 (4)° | Block, colourless |
γ = 76.505 (4)° | 0.16 × 0.07 × 0.04 mm |
V = 417.41 (5) Å3 |
Bruker–Nonius Roper CCD camera on κ-goniostat diffractometer | 1900 independent reflections |
Radiation source: Bruker-Nonius FR591 rotating anode | 1661 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.046 |
Detector resolution: 9.091 pixels mm-1 | θmax = 27.5°, θmin = 3.7° |
ϕ and ω scans | h = −6→6 |
Absorption correction: multi-scan (SADABS; Sheldrick, 2007) | k = −7→7 |
Tmin = 0.887, Tmax = 1.000 | l = −18→18 |
7495 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)] = 0.051 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.113 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.09 | w = 1/[σ2(Fo2) + (0.0304P)2 + 0.3732P] where P = (Fo2 + 2Fc2)/3 |
1900 reflections | (Δ/σ)max < 0.001 |
230 parameters | Δρmax = 0.24 e Å−3 |
6 restraints | Δρmin = −0.25 e Å−3 |
C16H23N3O5 | γ = 76.505 (4)° |
Mr = 337.38 | V = 417.41 (5) Å3 |
Triclinic, P1 | Z = 1 |
a = 5.3323 (4) Å | Mo Kα radiation |
b = 5.7200 (4) Å | µ = 0.10 mm−1 |
c = 14.3319 (10) Å | T = 120 K |
α = 79.919 (4)° | 0.16 × 0.07 × 0.04 mm |
β = 83.686 (4)° |
Bruker–Nonius Roper CCD camera on κ-goniostat diffractometer | 1900 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 2007) | 1661 reflections with I > 2σ(I) |
Tmin = 0.887, Tmax = 1.000 | Rint = 0.046 |
7495 measured reflections |
R[F2 > 2σ(F2)] = 0.051 | 6 restraints |
wR(F2) = 0.113 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.09 | Δρmax = 0.24 e Å−3 |
1900 reflections | Δρmin = −0.25 e Å−3 |
230 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 > 2σ(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 | 1.6917 (5) | 0.8513 (5) | 0.7563 (2) | 0.0280 (7) | |
O2 | 0.9933 (5) | 0.3081 (5) | 0.3426 (2) | 0.0259 (6) | |
O3 | 0.4988 (5) | 0.1450 (5) | 0.3533 (2) | 0.0244 (6) | |
H3O | 0.340 (3) | 0.190 (9) | 0.369 (3) | 0.037* | |
O4 | 0.4967 (5) | 0.9626 (5) | 0.06608 (19) | 0.0228 (6) | |
O5 | 0.2010 (5) | 0.7831 (5) | 0.1623 (2) | 0.0250 (6) | |
N1 | 1.0286 (6) | 0.6618 (6) | 0.4406 (2) | 0.0215 (7) | |
N2 | 0.8274 (6) | 0.6827 (6) | 0.3836 (2) | 0.0209 (7) | |
H2N | 0.709 (6) | 0.818 (5) | 0.373 (3) | 0.025* | |
N3 | 0.6282 (6) | 0.6919 (6) | 0.1906 (2) | 0.0212 (7) | |
H3N | 0.777 (5) | 0.731 (8) | 0.171 (3) | 0.025* | |
C1 | 1.2010 (7) | 0.8412 (7) | 0.5502 (3) | 0.0194 (8) | |
C2 | 1.4019 (7) | 0.6394 (7) | 0.5725 (3) | 0.0211 (8) | |
H2 | 1.4244 | 0.5028 | 0.5406 | 0.025* | |
C3 | 1.5699 (7) | 0.6361 (7) | 0.6412 (3) | 0.0222 (8) | |
H3 | 1.7053 | 0.4975 | 0.6560 | 0.027* | |
C4 | 1.5392 (7) | 0.8349 (7) | 0.6876 (3) | 0.0229 (8) | |
C5 | 1.3430 (8) | 1.0405 (7) | 0.6634 (3) | 0.0256 (9) | |
H5 | 1.3242 | 1.1793 | 0.6937 | 0.031* | |
C6 | 1.1777 (8) | 1.0429 (7) | 0.5961 (3) | 0.0251 (9) | |
H6 | 1.0453 | 1.1836 | 0.5805 | 0.030* | |
C7 | 1.8959 (8) | 0.6473 (8) | 0.7822 (3) | 0.0280 (9) | |
H7A | 1.8249 | 0.5017 | 0.8027 | 0.042* | |
H7B | 1.9827 | 0.6773 | 0.8343 | 0.042* | |
H7C | 2.0207 | 0.6225 | 0.7274 | 0.042* | |
C8 | 1.0108 (8) | 0.8446 (7) | 0.4829 (3) | 0.0229 (8) | |
H8 | 0.8738 | 0.9833 | 0.4709 | 0.027* | |
C9 | 0.8245 (7) | 0.4972 (7) | 0.3388 (3) | 0.0195 (7) | |
C10 | 0.5925 (7) | 0.5327 (7) | 0.2797 (3) | 0.0188 (7) | |
H10 | 0.4336 | 0.6117 | 0.3161 | 0.023* | |
C11 | 0.5605 (7) | 0.2847 (7) | 0.2643 (3) | 0.0226 (8) | |
H11A | 0.4206 | 0.3063 | 0.2214 | 0.027* | |
H11B | 0.7227 | 0.1972 | 0.2339 | 0.027* | |
C12 | 0.4209 (7) | 0.8111 (7) | 0.1416 (3) | 0.0188 (7) | |
C13 | 0.3072 (7) | 1.1111 (7) | −0.0009 (3) | 0.0213 (8) | |
C14 | 0.4761 (8) | 1.2529 (7) | −0.0707 (3) | 0.0264 (9) | |
H14A | 0.5607 | 1.3426 | −0.0360 | 0.040* | |
H14B | 0.3684 | 1.3678 | −0.1172 | 0.040* | |
H14C | 0.6079 | 1.1395 | −0.1037 | 0.040* | |
C15 | 0.0964 (8) | 1.2826 (7) | 0.0503 (3) | 0.0250 (8) | |
H15A | −0.0152 | 1.1886 | 0.0920 | 0.038* | |
H15B | −0.0070 | 1.4008 | 0.0034 | 0.038* | |
H15C | 0.1759 | 1.3688 | 0.0882 | 0.038* | |
C16 | 0.1993 (8) | 0.9468 (7) | −0.0514 (3) | 0.0244 (8) | |
H16A | 0.3423 | 0.8281 | −0.0770 | 0.037* | |
H16B | 0.0995 | 1.0457 | −0.1036 | 0.037* | |
H16C | 0.0868 | 0.8610 | −0.0063 | 0.037* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0280 (15) | 0.0329 (16) | 0.0243 (15) | −0.0048 (13) | −0.0056 (12) | −0.0074 (12) |
O2 | 0.0193 (14) | 0.0193 (13) | 0.0391 (17) | −0.0037 (11) | −0.0067 (12) | −0.0026 (12) |
O3 | 0.0160 (13) | 0.0238 (14) | 0.0286 (15) | −0.0031 (11) | −0.0011 (11) | 0.0066 (11) |
O4 | 0.0181 (13) | 0.0237 (14) | 0.0246 (14) | −0.0042 (11) | −0.0059 (11) | 0.0041 (11) |
O5 | 0.0229 (15) | 0.0279 (15) | 0.0241 (15) | −0.0076 (12) | −0.0041 (11) | 0.0006 (12) |
N1 | 0.0212 (16) | 0.0245 (16) | 0.0186 (16) | −0.0052 (13) | −0.0055 (12) | −0.0005 (13) |
N2 | 0.0183 (16) | 0.0231 (17) | 0.0203 (17) | −0.0016 (13) | −0.0073 (13) | −0.0007 (13) |
N3 | 0.0152 (15) | 0.0221 (17) | 0.0242 (17) | −0.0044 (12) | −0.0026 (13) | 0.0034 (13) |
C1 | 0.0201 (18) | 0.0232 (19) | 0.0155 (18) | −0.0087 (15) | −0.0010 (14) | 0.0007 (14) |
C2 | 0.0208 (19) | 0.0228 (19) | 0.0201 (19) | −0.0046 (16) | 0.0018 (15) | −0.0072 (15) |
C3 | 0.0189 (19) | 0.026 (2) | 0.0206 (19) | −0.0025 (15) | −0.0029 (15) | −0.0012 (16) |
C4 | 0.0205 (19) | 0.027 (2) | 0.022 (2) | −0.0094 (16) | 0.0011 (16) | 0.0001 (16) |
C5 | 0.028 (2) | 0.0212 (19) | 0.027 (2) | −0.0024 (16) | −0.0023 (17) | −0.0058 (16) |
C6 | 0.026 (2) | 0.0185 (18) | 0.029 (2) | 0.0007 (15) | −0.0069 (17) | −0.0021 (15) |
C7 | 0.025 (2) | 0.035 (2) | 0.023 (2) | −0.0076 (18) | −0.0057 (16) | 0.0015 (17) |
C8 | 0.0228 (19) | 0.0221 (19) | 0.022 (2) | −0.0055 (15) | −0.0005 (15) | 0.0016 (15) |
C9 | 0.0176 (18) | 0.0182 (17) | 0.0209 (19) | −0.0059 (14) | 0.0027 (14) | 0.0020 (14) |
C10 | 0.0157 (17) | 0.0221 (18) | 0.0180 (18) | −0.0044 (14) | −0.0016 (14) | −0.0008 (14) |
C11 | 0.023 (2) | 0.0199 (19) | 0.025 (2) | −0.0073 (15) | −0.0042 (16) | 0.0023 (15) |
C12 | 0.0202 (19) | 0.0202 (18) | 0.0161 (18) | −0.0072 (14) | −0.0012 (14) | 0.0001 (14) |
C13 | 0.0178 (18) | 0.0227 (19) | 0.0209 (19) | −0.0029 (15) | −0.0051 (15) | 0.0042 (15) |
C14 | 0.027 (2) | 0.022 (2) | 0.027 (2) | −0.0028 (16) | −0.0056 (17) | 0.0027 (16) |
C15 | 0.027 (2) | 0.022 (2) | 0.024 (2) | −0.0027 (16) | −0.0046 (16) | −0.0024 (15) |
C16 | 0.026 (2) | 0.0255 (19) | 0.022 (2) | −0.0068 (16) | −0.0025 (16) | −0.0036 (16) |
O1—C4 | 1.372 (5) | C5—H5 | 0.9500 |
O1—C7 | 1.425 (5) | C6—H6 | 0.9500 |
O2—C9 | 1.233 (5) | C7—H7A | 0.9800 |
O3—C11 | 1.431 (4) | C7—H7B | 0.9800 |
O3—H3O | 0.841 (10) | C7—H7C | 0.9800 |
O4—C12 | 1.350 (4) | C8—H8 | 0.9500 |
O4—C13 | 1.480 (4) | C9—C10 | 1.530 (5) |
O5—C12 | 1.218 (4) | C10—C11 | 1.524 (5) |
N1—C8 | 1.278 (5) | C10—H10 | 1.0000 |
N1—N2 | 1.389 (4) | C11—H11A | 0.9900 |
N2—C9 | 1.336 (5) | C11—H11B | 0.9900 |
N2—H2N | 0.880 (10) | C13—C15 | 1.523 (5) |
N3—C12 | 1.353 (5) | C13—C16 | 1.523 (5) |
N3—C10 | 1.455 (5) | C13—C14 | 1.526 (5) |
N3—H3N | 0.880 (10) | C14—H14A | 0.9800 |
C1—C2 | 1.397 (5) | C14—H14B | 0.9800 |
C1—C6 | 1.401 (6) | C14—H14C | 0.9800 |
C1—C8 | 1.469 (5) | C15—H15A | 0.9800 |
C2—C3 | 1.397 (5) | C15—H15B | 0.9800 |
C2—H2 | 0.9500 | C15—H15C | 0.9800 |
C3—C4 | 1.385 (5) | C16—H16A | 0.9800 |
C3—H3 | 0.9500 | C16—H16B | 0.9800 |
C4—C5 | 1.400 (6) | C16—H16C | 0.9800 |
C5—C6 | 1.372 (6) | ||
C4—O1—C7 | 117.4 (3) | N3—C10—C11 | 112.2 (3) |
C11—O3—H3O | 109 (3) | N3—C10—C9 | 109.8 (3) |
C12—O4—C13 | 120.5 (3) | C11—C10—C9 | 109.1 (3) |
C8—N1—N2 | 114.4 (3) | N3—C10—H10 | 108.6 |
C9—N2—N1 | 118.8 (3) | C11—C10—H10 | 108.6 |
C9—N2—H2N | 119 (3) | C9—C10—H10 | 108.6 |
N1—N2—H2N | 122 (3) | O3—C11—C10 | 110.0 (3) |
C12—N3—C10 | 119.8 (3) | O3—C11—H11A | 109.7 |
C12—N3—H3N | 117 (3) | C10—C11—H11A | 109.7 |
C10—N3—H3N | 122 (3) | O3—C11—H11B | 109.7 |
C2—C1—C6 | 118.3 (4) | C10—C11—H11B | 109.7 |
C2—C1—C8 | 122.2 (3) | H11A—C11—H11B | 108.2 |
C6—C1—C8 | 119.5 (3) | O5—C12—N3 | 124.9 (3) |
C1—C2—C3 | 120.8 (3) | O5—C12—O4 | 125.6 (3) |
C1—C2—H2 | 119.6 | N3—C12—O4 | 109.5 (3) |
C3—C2—H2 | 119.6 | O4—C13—C15 | 110.6 (3) |
C4—C3—C2 | 120.0 (3) | O4—C13—C16 | 110.2 (3) |
C4—C3—H3 | 120.0 | C15—C13—C16 | 112.6 (3) |
C2—C3—H3 | 120.0 | O4—C13—C14 | 101.7 (3) |
O1—C4—C3 | 125.0 (3) | C15—C13—C14 | 110.9 (3) |
O1—C4—C5 | 115.6 (3) | C16—C13—C14 | 110.4 (3) |
C3—C4—C5 | 119.4 (3) | C13—C14—H14A | 109.5 |
C6—C5—C4 | 120.4 (4) | C13—C14—H14B | 109.5 |
C6—C5—H5 | 119.8 | H14A—C14—H14B | 109.5 |
C4—C5—H5 | 119.8 | C13—C14—H14C | 109.5 |
C5—C6—C1 | 121.0 (4) | H14A—C14—H14C | 109.5 |
C5—C6—H6 | 119.5 | H14B—C14—H14C | 109.5 |
C1—C6—H6 | 119.5 | C13—C15—H15A | 109.5 |
O1—C7—H7A | 109.5 | C13—C15—H15B | 109.5 |
O1—C7—H7B | 109.5 | H15A—C15—H15B | 109.5 |
H7A—C7—H7B | 109.5 | C13—C15—H15C | 109.5 |
O1—C7—H7C | 109.5 | H15A—C15—H15C | 109.5 |
H7A—C7—H7C | 109.5 | H15B—C15—H15C | 109.5 |
H7B—C7—H7C | 109.5 | C13—C16—H16A | 109.5 |
N1—C8—C1 | 120.4 (3) | C13—C16—H16B | 109.5 |
N1—C8—H8 | 119.8 | H16A—C16—H16B | 109.5 |
C1—C8—H8 | 119.8 | C13—C16—H16C | 109.5 |
O2—C9—N2 | 124.3 (4) | H16A—C16—H16C | 109.5 |
O2—C9—C10 | 120.3 (3) | H16B—C16—H16C | 109.5 |
N2—C9—C10 | 115.4 (3) | ||
C8—N1—N2—C9 | −177.8 (3) | N1—N2—C9—C10 | 178.5 (3) |
C6—C1—C2—C3 | 2.0 (6) | C12—N3—C10—C11 | 79.8 (4) |
C8—C1—C2—C3 | −176.0 (4) | C12—N3—C10—C9 | −158.7 (3) |
C1—C2—C3—C4 | −0.3 (6) | O2—C9—C10—N3 | −102.2 (4) |
C7—O1—C4—C3 | −0.5 (5) | N2—C9—C10—N3 | 77.5 (4) |
C7—O1—C4—C5 | −179.2 (4) | O2—C9—C10—C11 | 21.1 (5) |
C2—C3—C4—O1 | 179.7 (4) | N2—C9—C10—C11 | −159.2 (3) |
C2—C3—C4—C5 | −1.6 (6) | N3—C10—C11—O3 | −173.9 (3) |
O1—C4—C5—C6 | −179.4 (4) | C9—C10—C11—O3 | 64.3 (4) |
C3—C4—C5—C6 | 1.8 (6) | C10—N3—C12—O5 | −5.9 (6) |
C4—C5—C6—C1 | −0.1 (6) | C10—N3—C12—O4 | 174.9 (3) |
C2—C1—C6—C5 | −1.8 (6) | C13—O4—C12—O5 | −0.7 (5) |
C8—C1—C6—C5 | 176.2 (4) | C13—O4—C12—N3 | 178.6 (3) |
N2—N1—C8—C1 | 176.1 (3) | C12—O4—C13—C15 | 60.9 (4) |
C2—C1—C8—N1 | −1.8 (5) | C12—O4—C13—C16 | −64.3 (4) |
C6—C1—C8—N1 | −179.8 (4) | C12—O4—C13—C14 | 178.7 (3) |
N1—N2—C9—O2 | −1.9 (5) |
D—H···A | D—H | H···A | D···A | D—H···A |
O3—H3o···O2i | 0.84 (3) | 1.87 (3) | 2.651 (4) | 153 (4) |
N2—H2n···O3ii | 0.88 (3) | 1.93 (3) | 2.803 (4) | 169 (3) |
N3—H3n···O5iii | 0.88 (3) | 2.34 (3) | 3.188 (4) | 164 (4) |
Symmetry codes: (i) x−1, y, z; (ii) x, y+1, z; (iii) x+1, y, z. |
Experimental details
Crystal data | |
Chemical formula | C16H23N3O5 |
Mr | 337.38 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 120 |
a, b, c (Å) | 5.3323 (4), 5.7200 (4), 14.3319 (10) |
α, β, γ (°) | 79.919 (4), 83.686 (4), 76.505 (4) |
V (Å3) | 417.41 (5) |
Z | 1 |
Radiation type | Mo Kα |
µ (mm−1) | 0.10 |
Crystal size (mm) | 0.16 × 0.07 × 0.04 |
Data collection | |
Diffractometer | Bruker–Nonius Roper CCD camera on κ-goniostat diffractometer |
Absorption correction | Multi-scan (SADABS; Sheldrick, 2007) |
Tmin, Tmax | 0.887, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 7495, 1900, 1661 |
Rint | 0.046 |
(sin θ/λ)max (Å−1) | 0.649 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.051, 0.113, 1.09 |
No. of reflections | 1900 |
No. of parameters | 230 |
No. of restraints | 6 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.24, −0.25 |
Computer programs: , DENZO (Otwinowski & Minor, 1997) and COLLECT (Hooft, 1998), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 2006), publCIF (Westrip, 2010).
D—H···A | D—H | H···A | D···A | D—H···A |
O3—H3o···O2i | 0.84 (3) | 1.87 (3) | 2.651 (4) | 153 (4) |
N2—H2n···O3ii | 0.88 (3) | 1.93 (3) | 2.803 (4) | 169 (3) |
N3—H3n···O5iii | 0.88 (3) | 2.34 (3) | 3.188 (4) | 164 (4) |
Symmetry codes: (i) x−1, y, z; (ii) x, y+1, z; (iii) x+1, y, z. |
Footnotes
‡Additional correspondence author, e-mail: j.wardell@abdn.ac.uk.
Acknowledgements
The use of the EPSRC X-ray crystallographic service at the University of Southampton, England, and the valuable assistance of the staff there is gratefully acknowledged. JLW acknowledges support from CAPES (Brazil).
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 anti-tumour activity of L-serine derivatives (Jiao et al., 2009; Yakura et al.,2007) and the development of N-acylhydrazone derivatives from L-serine for use in anti-tumour testing (Pinheiro et al., 2010; de Souza et al., 2010; Pinheiro et al., 2011: Howie et al.,2011) is well documented.
Although the absolute structure of (I), Fig. 1, could not be determined experimentally, the assignment of the S-configuration at the C10 atom is based on a starting reagent. The synthetic protocols led to the formation of both the E and Z isomers (see Experimental). Recrystallization provided one isomer only, with the conformation about the N1═C8 imine bond [1.278 (5) Å] being E. The molecule is twisted about the chiral centre as seen in the value of the N2—C9—C10—N3 torsion angle of 77.5 (4) °; the dihedral angle formed between the two amide residues, i.e. N2,C9,O2 and N3,C12,O5, is 79.6 (3) °. This arrangement precludes the formation of intramolecular hydrogen bonds. The methoxy residue is co-planar with the benzene ring to which it is attached as seen in the C7—O1—C4—C3 torsion angle of -0.5 (5) °.
The crystal packing is dominated by hydrogen bonding interactions whereby each of the acidic hydrogen atoms forms a hydrogen bond. Thus, the hydroxy-OH forms a hydrogen bond with the hydrazine-carbonyl, and at the same time accepts a hydrogen bond from the hydrazine-amine. The carbamate-amine forms a hydrogen bond with the carbamate-carbonyl; details are given in Table 1. The hydrogen bonding leads to layers in the ab plane, Fig. 2, which stack along the c axis, Fig. 3.