organic compounds
N-Benzyl-2-(3-chloro-4-hydroxyphenyl)acetamide
aEskitis Institute for Cell and Molecular Therapies, Griffith University, Nathan, Brisbane 4111, Australia, and bSchool of Biomolecular and Physical Sciences, Griffith University, Nathan, Brisbane 4111, Australia
*Correspondence e-mail: p.healy@griffith.edu.au
The title compound, C15H14ClNO2, was synthesized as part of a project to generate a combinatorial library based on the fungal natural product 2-(3-chloro-4-hydroxyphenyl)acetamide. It crystallizes as non-planar discrete molecules [the peripheral 3-chloro-4-hydroxyphenyl and benzyl groups are twisted out of the plane of the central acetamide group, with N—C—C—C and C—C—C—C torsion angles of −58.8 (3) and 65.0 (2)°, respectively] linked by intermolecular N—H⋯O and O—H⋯O hydrogen bonds.
Related literature
For the preparation and characterization of the title compound, see: Poulsen et al. (2006); Davis et al. (2007). For the biological activity of the title compound, see: Davis et al. (2005, 2007). For background to organohalogen natural products, see: Gribble (1996). For related structures having the 3-chloro-4-hydroxyphenylacetamide moiety, see: Krohn et al. (1992); Davis et al. (2005); Davis & Healy (2008).
Experimental
Crystal data
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Data collection: CrysAlis CCD (Oxford Diffraction, 2009); cell CrysAlis RED (Oxford Diffraction, 2009); data reduction: CrysAlis RED; program(s) used to solve structure: SIR97 (Altomare et al., 1999); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: PLATON (Spek, 2009).
Supporting information
10.1107/S1600536810035397/tk2709sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536810035397/tk2709Isup2.hkl
Compound (I) was prepared and analytically and spectroscopically characterized as previously reported (Davis et al., 2007; Poulsen et al., 2006). Crystals suitable for X-ray diffraction studies were obtained by recrystallization from a solution of the compound in a solvent mix of 90% methanol, 10% water, and 0.1% trifluoroacetic acid.
The carbon-bound H atoms were constrained as riding atoms with C—H = 0.93–0.96 Å. The amide and hydroxyl protons were located in difference Fourier maps and constrained with N—H 0.86 Å and O—H = 0.90 Å in the final
Uiso(H) values were set at 1.2Ueq of the parent atom.Data collection: CrysAlis CCD (Oxford Diffraction, 2009); cell
CrysAlis RED (Oxford Diffraction, 2009); data reduction: CrysAlis RED (Oxford Diffraction, 2009); program(s) used to solve structure: SIR97 (Altomare et al., 1999); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: PLATON (Spek, 2009).C15H14ClNO2 | F(000) = 288 |
Mr = 275.72 | Dx = 1.377 Mg m−3 |
Monoclinic, P21 | Mo Kα radiation, λ = 0.71070 Å |
Hall symbol: P 2yb | Cell parameters from 2771 reflections |
a = 4.8255 (2) Å | θ = 3.2–32.2° |
b = 10.8520 (5) Å | µ = 0.28 mm−1 |
c = 12.7701 (6) Å | T = 296 K |
β = 96.055 (4)° | Plate, colourless |
V = 664.99 (5) Å3 | 0.55 × 0.40 × 0.04 mm |
Z = 2 |
Oxford-Diffraction Gemini S Ultra diffractometer | 2334 independent reflections |
Radiation source: Enhance (Mo) X-ray Source | 1979 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.020 |
Detector resolution: 16.0774 pixels mm-1 | θmax = 25.0°, θmin = 3.2° |
ω and ϕ scans | h = −5→5 |
Absorption correction: multi-scan (CrysAlis PRO; Oxford Diffraction, 2010) | k = −12→12 |
Tmin = 0.859, Tmax = 0.989 | l = −15→12 |
4800 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)] = 0.030 | H-atom parameters constrained |
wR(F2) = 0.070 | w = 1/[σ2(Fo2) + (0.0444P)2] where P = (Fo2 + 2Fc2)/3 |
S = 0.96 | (Δ/σ)max = 0.002 |
2334 reflections | Δρmax = 0.13 e Å−3 |
172 parameters | Δρmin = −0.15 e Å−3 |
1 restraint | Absolute structure: Flack (1983), 1098 Friedel pairs |
Primary atom site location: structure-invariant direct methods | Absolute structure parameter: −0.11 (6) |
C15H14ClNO2 | V = 664.99 (5) Å3 |
Mr = 275.72 | Z = 2 |
Monoclinic, P21 | Mo Kα radiation |
a = 4.8255 (2) Å | µ = 0.28 mm−1 |
b = 10.8520 (5) Å | T = 296 K |
c = 12.7701 (6) Å | 0.55 × 0.40 × 0.04 mm |
β = 96.055 (4)° |
Oxford-Diffraction Gemini S Ultra diffractometer | 2334 independent reflections |
Absorption correction: multi-scan (CrysAlis PRO; Oxford Diffraction, 2010) | 1979 reflections with I > 2σ(I) |
Tmin = 0.859, Tmax = 0.989 | Rint = 0.020 |
4800 measured reflections |
R[F2 > 2σ(F2)] = 0.030 | H-atom parameters constrained |
wR(F2) = 0.070 | Δρmax = 0.13 e Å−3 |
S = 0.96 | Δρmin = −0.15 e Å−3 |
2334 reflections | Absolute structure: Flack (1983), 1098 Friedel pairs |
172 parameters | Absolute structure parameter: −0.11 (6) |
1 restraint |
Experimental. CrysAlisPro (Oxford Diffraction, 2010). Empirical absorption correction using spherical harmonics, implemented in SCALE3 ABSPACK scaling algorithm. |
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 e.s.d.'s are taken into account in the estimation of distances, angles and torsion angles |
Refinement. Refinement on F2 for ALL reflections except those flagged by the user for potential systematic errors. Weighted R-factors wR and all goodnesses of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The observed criterion of F2 > σ(F2) is used only for calculating -R-factor-obs 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 | ||
Cl3 | −0.22153 (16) | 0.10603 (6) | 0.70233 (4) | 0.0799 (3) | |
O4 | −0.5174 (3) | 0.33833 (14) | 0.69050 (12) | 0.0612 (6) | |
O8 | −0.3412 (2) | 0.08182 (14) | 0.27899 (10) | 0.0506 (5) | |
N1 | 0.0633 (3) | 0.05425 (16) | 0.21183 (12) | 0.0452 (5) | |
C1 | −0.1150 (4) | 0.25973 (19) | 0.42574 (15) | 0.0386 (6) | |
C2 | −0.1047 (4) | 0.1808 (2) | 0.51082 (16) | 0.0449 (7) | |
C3 | −0.2387 (4) | 0.20842 (19) | 0.59745 (15) | 0.0452 (7) | |
C4 | −0.3886 (4) | 0.31713 (18) | 0.60254 (15) | 0.0431 (7) | |
C5 | −0.3982 (4) | 0.39584 (19) | 0.51848 (17) | 0.0480 (7) | |
C6 | −0.2645 (4) | 0.36758 (19) | 0.43020 (16) | 0.0469 (7) | |
C7 | 0.0273 (4) | 0.2253 (2) | 0.33001 (16) | 0.0462 (7) | |
C8 | −0.0977 (3) | 0.1137 (2) | 0.27214 (13) | 0.0366 (6) | |
C9 | −0.0319 (5) | −0.0518 (2) | 0.14734 (18) | 0.0568 (8) | |
C10 | 0.1377 (4) | −0.06951 (19) | 0.05671 (16) | 0.0412 (7) | |
C11 | 0.1558 (4) | 0.0217 (2) | −0.01686 (18) | 0.0577 (8) | |
C12 | 0.3073 (5) | 0.0053 (2) | −0.10153 (19) | 0.0663 (9) | |
C13 | 0.4390 (5) | −0.1045 (3) | −0.11432 (19) | 0.0643 (9) | |
C14 | 0.4229 (5) | −0.1963 (2) | −0.04274 (19) | 0.0660 (9) | |
C15 | 0.2735 (5) | −0.1792 (2) | 0.04367 (18) | 0.0531 (8) | |
H1 | 0.23170 | 0.07840 | 0.20990 | 0.0540* | |
H2 | −0.00440 | 0.10590 | 0.50930 | 0.0540* | |
H4 | −0.56440 | 0.41910 | 0.70050 | 0.0730* | |
H5 | −0.49940 | 0.47080 | 0.52080 | 0.0570* | |
H6 | −0.27380 | 0.42290 | 0.37290 | 0.0580* | |
H11 | 0.06190 | 0.09810 | −0.00830 | 0.0710* | |
H12 | 0.31640 | 0.06970 | −0.15180 | 0.0840* | |
H13 | 0.54640 | −0.11580 | −0.17020 | 0.0790* | |
H14 | 0.50880 | −0.27320 | −0.05200 | 0.0800* | |
H15 | 0.26570 | −0.24260 | 0.09380 | 0.0660* | |
H71 | 0.01580 | 0.29320 | 0.28310 | 0.0550* | |
H72 | 0.21760 | 0.20810 | 0.35260 | 0.0550* | |
H91 | −0.22280 | −0.03950 | 0.12110 | 0.0690* | |
H92 | −0.01890 | −0.12390 | 0.19040 | 0.0690* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl3 | 0.1357 (6) | 0.0590 (4) | 0.0499 (3) | 0.0134 (4) | 0.0333 (3) | 0.0106 (3) |
O4 | 0.0733 (10) | 0.0631 (10) | 0.0523 (9) | 0.0062 (8) | 0.0312 (8) | −0.0102 (8) |
O8 | 0.0325 (6) | 0.0649 (11) | 0.0572 (8) | −0.0121 (6) | 0.0183 (6) | −0.0131 (7) |
N1 | 0.0279 (7) | 0.0588 (11) | 0.0510 (10) | −0.0130 (7) | 0.0142 (7) | −0.0190 (9) |
C1 | 0.0343 (9) | 0.0426 (11) | 0.0406 (11) | −0.0076 (8) | 0.0115 (8) | −0.0073 (9) |
C2 | 0.0506 (11) | 0.0393 (12) | 0.0464 (12) | 0.0077 (9) | 0.0128 (9) | −0.0042 (10) |
C3 | 0.0564 (12) | 0.0425 (11) | 0.0382 (11) | −0.0023 (9) | 0.0124 (10) | −0.0009 (9) |
C4 | 0.0439 (11) | 0.0464 (12) | 0.0409 (11) | 0.0001 (9) | 0.0140 (9) | −0.0086 (10) |
C5 | 0.0495 (12) | 0.0446 (12) | 0.0515 (13) | 0.0108 (9) | 0.0133 (10) | −0.0059 (11) |
C6 | 0.0550 (12) | 0.0431 (12) | 0.0440 (12) | −0.0021 (10) | 0.0122 (10) | −0.0004 (10) |
C7 | 0.0428 (10) | 0.0524 (13) | 0.0468 (11) | −0.0101 (10) | 0.0201 (9) | −0.0079 (10) |
C8 | 0.0304 (9) | 0.0481 (11) | 0.0325 (9) | −0.0038 (9) | 0.0095 (7) | 0.0021 (9) |
C9 | 0.0489 (12) | 0.0657 (15) | 0.0591 (14) | −0.0192 (10) | 0.0209 (11) | −0.0221 (12) |
C10 | 0.0353 (10) | 0.0465 (13) | 0.0426 (11) | −0.0105 (9) | 0.0075 (8) | −0.0099 (10) |
C11 | 0.0580 (13) | 0.0485 (14) | 0.0683 (16) | 0.0089 (11) | 0.0151 (12) | 0.0015 (12) |
C12 | 0.0759 (16) | 0.0680 (17) | 0.0571 (15) | −0.0015 (13) | 0.0172 (13) | 0.0140 (13) |
C13 | 0.0702 (15) | 0.0805 (19) | 0.0456 (13) | −0.0025 (13) | 0.0221 (11) | −0.0122 (13) |
C14 | 0.0833 (18) | 0.0581 (16) | 0.0593 (15) | 0.0144 (12) | 0.0209 (13) | −0.0156 (13) |
C15 | 0.0693 (14) | 0.0426 (13) | 0.0482 (12) | −0.0012 (10) | 0.0099 (10) | −0.0025 (10) |
Cl3—C3 | 1.736 (2) | C10—C11 | 1.374 (3) |
O4—C4 | 1.360 (2) | C11—C12 | 1.379 (3) |
O8—C8 | 1.2368 (18) | C12—C13 | 1.368 (4) |
O4—H4 | 0.9200 | C13—C14 | 1.360 (4) |
N1—C8 | 1.319 (2) | C14—C15 | 1.393 (3) |
N1—C9 | 1.461 (3) | C2—H2 | 0.9500 |
N1—H1 | 0.8600 | C5—H5 | 0.9500 |
C1—C7 | 1.511 (3) | C6—H6 | 0.9400 |
C1—C6 | 1.379 (3) | C7—H71 | 0.9500 |
C1—C2 | 1.380 (3) | C7—H72 | 0.9500 |
C2—C3 | 1.372 (3) | C9—H91 | 0.9600 |
C3—C4 | 1.389 (3) | C9—H92 | 0.9500 |
C4—C5 | 1.369 (3) | C11—H11 | 0.9600 |
C5—C6 | 1.391 (3) | C12—H12 | 0.9500 |
C7—C8 | 1.511 (3) | C13—H13 | 0.9300 |
C9—C10 | 1.499 (3) | C14—H14 | 0.9400 |
C10—C15 | 1.377 (3) | C15—H15 | 0.9400 |
Cl3···O4 | 2.8932 (17) | H1···O8vii | 2.1500 |
Cl3···C12i | 3.554 (2) | H1···C11 | 2.9500 |
Cl3···H12ii | 3.0800 | H1···H72 | 2.3100 |
Cl3···H12i | 3.0600 | H1···H4viii | 2.5500 |
Cl3···H15iii | 3.1000 | H2···C8 | 3.0200 |
O4···Cl3 | 2.8932 (17) | H2···C5viii | 3.0400 |
O4···O8iv | 2.767 (2) | H2···C6viii | 2.9600 |
O4···C9iv | 3.375 (3) | H4···H5 | 2.4100 |
O4···C9iii | 3.403 (3) | H4···O8iv | 1.8500 |
O8···O4v | 2.767 (2) | H4···N1iii | 2.9500 |
O8···N1vi | 2.9262 (18) | H4···C8iv | 2.7100 |
O8···C2 | 3.242 (2) | H4···C9iv | 2.9100 |
O4···H92iii | 2.8900 | H4···H1iii | 2.5500 |
O4···H92iv | 2.8600 | H5···H4 | 2.4100 |
O8···H72vi | 2.7800 | H5···C2iv | 2.9700 |
O8···H91 | 2.5200 | H6···H71 | 2.3600 |
O8···H1vi | 2.1500 | H11···N1 | 2.8500 |
O8···H4v | 1.8500 | H11···C15xii | 2.9200 |
N1···O8vii | 2.9262 (18) | H11···H14x | 2.5500 |
N1···H11 | 2.8500 | H11···H15xii | 2.5100 |
N1···H4viii | 2.9500 | H12···Cl3ix | 3.0600 |
C2···O8 | 3.242 (2) | H12···Cl3xiii | 3.0800 |
C9···O4viii | 3.403 (3) | H14···C11xiv | 2.8400 |
C9···O4v | 3.375 (3) | H14···H11xiv | 2.5500 |
C12···Cl3ix | 3.554 (2) | H15···H92 | 2.3300 |
C2···H5v | 2.9700 | H15···Cl3viii | 3.1000 |
C5···H2iii | 3.0400 | H15···H11xi | 2.5100 |
C6···H2iii | 2.9600 | H71···H6 | 2.3600 |
C8···H4v | 2.7100 | H72···O8vii | 2.7800 |
C8···H2 | 3.0200 | H72···H1 | 2.3100 |
C9···H4v | 2.9100 | H91···O8 | 2.5200 |
C11···H1 | 2.9500 | H91···C14vi | 3.0700 |
C11···H14x | 2.8400 | H91···C15vi | 2.9500 |
C14···H91vii | 3.0700 | H92···H15 | 2.3300 |
C15···H91vii | 2.9500 | H92···O4v | 2.8600 |
C15···H11xi | 2.9200 | H92···O4viii | 2.8900 |
C4—O4—H4 | 115.00 | C10—C15—C14 | 120.2 (2) |
C8—N1—C9 | 123.03 (16) | C1—C2—H2 | 119.00 |
C8—N1—H1 | 119.00 | C3—C2—H2 | 119.00 |
C9—N1—H1 | 118.00 | C4—C5—H5 | 119.00 |
C2—C1—C6 | 118.01 (18) | C6—C5—H5 | 120.00 |
C2—C1—C7 | 120.12 (18) | C1—C6—H6 | 119.00 |
C6—C1—C7 | 121.85 (18) | C5—C6—H6 | 120.00 |
C1—C2—C3 | 121.21 (19) | C1—C7—H71 | 109.00 |
C2—C3—C4 | 121.02 (19) | C1—C7—H72 | 108.00 |
Cl3—C3—C2 | 119.61 (16) | C8—C7—H71 | 109.00 |
Cl3—C3—C4 | 119.37 (15) | C8—C7—H72 | 108.00 |
O4—C4—C3 | 117.91 (17) | H71—C7—H72 | 110.00 |
O4—C4—C5 | 124.18 (18) | N1—C9—H91 | 109.00 |
C3—C4—C5 | 117.91 (18) | N1—C9—H92 | 109.00 |
C4—C5—C6 | 121.19 (19) | C10—C9—H91 | 109.00 |
C1—C6—C5 | 120.66 (19) | C10—C9—H92 | 109.00 |
C1—C7—C8 | 113.70 (16) | H91—C9—H92 | 109.00 |
O8—C8—C7 | 121.53 (16) | C10—C11—H11 | 119.00 |
O8—C8—N1 | 121.81 (18) | C12—C11—H11 | 120.00 |
N1—C8—C7 | 116.64 (15) | C11—C12—H12 | 120.00 |
N1—C9—C10 | 111.81 (18) | C13—C12—H12 | 120.00 |
C9—C10—C11 | 121.00 (19) | C12—C13—H13 | 121.00 |
C9—C10—C15 | 120.65 (19) | C14—C13—H13 | 120.00 |
C11—C10—C15 | 118.33 (19) | C13—C14—H14 | 120.00 |
C10—C11—C12 | 121.4 (2) | C15—C14—H14 | 119.00 |
C11—C12—C13 | 119.8 (2) | C10—C15—H15 | 120.00 |
C12—C13—C14 | 119.8 (2) | C14—C15—H15 | 120.00 |
C13—C14—C15 | 120.4 (2) | ||
C8—N1—C9—C10 | 156.64 (18) | C3—C4—C5—C6 | 0.6 (3) |
C9—N1—C8—O8 | 1.0 (3) | O4—C4—C5—C6 | −179.11 (18) |
C9—N1—C8—C7 | −177.14 (17) | C4—C5—C6—C1 | −0.9 (3) |
C6—C1—C2—C3 | 0.0 (3) | C1—C7—C8—O8 | 23.7 (3) |
C7—C1—C2—C3 | −178.18 (18) | C1—C7—C8—N1 | −158.08 (17) |
C2—C1—C6—C5 | 0.6 (3) | N1—C9—C10—C11 | −58.8 (3) |
C6—C1—C7—C8 | −113.1 (2) | N1—C9—C10—C15 | 122.9 (2) |
C2—C1—C7—C8 | 65.0 (2) | C9—C10—C15—C14 | 177.8 (2) |
C7—C1—C6—C5 | 178.69 (18) | C11—C10—C15—C14 | −0.5 (3) |
C1—C2—C3—C4 | −0.2 (3) | C9—C10—C11—C12 | −178.8 (2) |
C1—C2—C3—Cl3 | 179.67 (16) | C15—C10—C11—C12 | −0.5 (3) |
Cl3—C3—C4—O4 | −0.2 (3) | C10—C11—C12—C13 | 1.2 (3) |
C2—C3—C4—C5 | −0.1 (3) | C11—C12—C13—C14 | −0.9 (4) |
Cl3—C3—C4—C5 | −179.95 (15) | C12—C13—C14—C15 | −0.1 (4) |
C2—C3—C4—O4 | 179.67 (18) | C13—C14—C15—C10 | 0.8 (4) |
Symmetry codes: (i) x, y, z+1; (ii) x−1, y, z+1; (iii) −x, y+1/2, −z+1; (iv) −x−1, y+1/2, −z+1; (v) −x−1, y−1/2, −z+1; (vi) x−1, y, z; (vii) x+1, y, z; (viii) −x, y−1/2, −z+1; (ix) x, y, z−1; (x) −x+1, y+1/2, −z; (xi) −x, y−1/2, −z; (xii) −x, y+1/2, −z; (xiii) x+1, y, z−1; (xiv) −x+1, y−1/2, −z. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O8vii | 0.86 | 2.15 | 2.9262 (18) | 150 |
O4—H4···O8iv | 0.92 | 1.85 | 2.767 (2) | 180 |
Symmetry codes: (iv) −x−1, y+1/2, −z+1; (vii) x+1, y, z. |
Experimental details
Crystal data | |
Chemical formula | C15H14ClNO2 |
Mr | 275.72 |
Crystal system, space group | Monoclinic, P21 |
Temperature (K) | 296 |
a, b, c (Å) | 4.8255 (2), 10.8520 (5), 12.7701 (6) |
β (°) | 96.055 (4) |
V (Å3) | 664.99 (5) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.28 |
Crystal size (mm) | 0.55 × 0.40 × 0.04 |
Data collection | |
Diffractometer | Oxford-Diffraction Gemini S Ultra diffractometer |
Absorption correction | Multi-scan (CrysAlis PRO; Oxford Diffraction, 2010) |
Tmin, Tmax | 0.859, 0.989 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 4800, 2334, 1979 |
Rint | 0.020 |
(sin θ/λ)max (Å−1) | 0.595 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.030, 0.070, 0.96 |
No. of reflections | 2334 |
No. of parameters | 172 |
No. of restraints | 1 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.13, −0.15 |
Absolute structure | Flack (1983), 1098 Friedel pairs |
Absolute structure parameter | −0.11 (6) |
Computer programs: CrysAlis CCD (Oxford Diffraction, 2009), CrysAlis RED (Oxford Diffraction, 2009), SIR97 (Altomare et al., 1999), SHELXL97 (Sheldrick, 2008), ORTEP-3 for Windows (Farrugia, 1997), PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O8i | 0.86 | 2.15 | 2.9262 (18) | 150 |
O4—H4···O8ii | 0.92 | 1.85 | 2.767 (2) | 180 |
Symmetry codes: (i) x+1, y, z; (ii) −x−1, y+1/2, −z+1. |
Acknowledgements
We acknowledge financial support of this work by Griffith University, the Queensland University of Technology, the Eskitis Institute for Cell and Molecular Therapies and the Australian Research Council.
References
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The title compound (I) (Fig. 1) was synthesized during the generation of a combinatorial library based on the fungal natural product 3-chloro-4-hydroxyphenylacetamide and was shown to display moderate cytotoxicity towards the human melanoma cell line MM96L and the human prostate cell line DU145 with IC50 values of 72 and 51 µM respectively (Davis et al., 2007). Although many organohalogen natural products have been identified (Gribble, 1996), only three crystal structures on compounds incorporating the 3-chloro-4-hydroxyphenylacetamide moiety have been reported to date (Krohn et al., 1992; Davis et al., 2005; Davis & Healy, 2008).
The present compound crystallizes in the chiral space group P21 as discrete molecules with the central C1—C7—C8(-08)-N1—C9—C10 fragment approximately planar. The peripheral 3-chloro-4-hydroxyphenyl (C1—C7, O4, Cl3) and benzyl (C9—C15) groups are twisted out of the plane of the central acetamide group with N1—C9—C10—C11 and C2—C1—C7—C8 torsion angles of -58.8 (3) and 65.0 (2) °, respectively (Fig. 1). In the crystal lattice the amide (N1) and hydroxy (O4) groups form inter-molecular N—H···O and O—H···O hydrogen bonds with the carbonyl O atoms (O8) at (1 + x, y, z) and (-x - 1, y + 1/2, 1 - z), respectively (Table 1 & Fig. 2).