organic compounds
(E)-3-{[([1,1′-Biphenyl]-3-ylmethyl)iminiumyl]methyl}-6,8-dichloro-2H-chromen-4-olate
aSchool of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
*Correspondence e-mail: ishi206@u-shizuoka-ken.ac.jp
In the crystal of the title compound, C23H17Cl2NO2, the H atom of the –OH group is transferred to the N atom of the imine, forming a zwitterion. This results in a six-membered intramolecular O⋯H—N hydrogen-bonded ring, rather than that formed with an O—H⋯N hydrogen bond. The dihedral angle between the rings of the biphenyl unit is 13.88 (10)°. In the crystal, molecules are linked by N—H⋯O and C—H⋯O interactions.
Related literature
For the biological propertries of similar structures, see: Khan et al. (2009); Tu et al. (2013). For related structures, see: Benaouida et al. (2013); Małecka & Budzisz (2006); Ishikawa & Motohashi (2013a,b).
Experimental
Crystal data
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Data collection: WinAFC (Rigaku, 1999); cell WinAFC; data reduction: WinAFC; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: CrystalStructure (Rigaku, 2010); software used to prepare material for publication: CrystalStructure.
Supporting information
10.1107/S160053681302285X/hb7114sup1.cif
contains datablocks General, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S160053681302285X/hb7114Isup2.hkl
3-Phenylbenzylamine (5.46 mmol), 6,8-dichloro-3-formylchromone (5.0 mmol) and 10 mg of p-toluenesulfonic acid were dissolved in 80 ml of benzene, and refluxed with Dean-Stark apparatus for 30 min. After cooling, the mixture was evaporated. To this residue, MeOH-AcOH (10:1, 60 ml) and 2-picoline borane (5 mmol) were added, and stirred overnight at room temperature. After the mixture was extracted with methylene chloride, the extract was washed with brine, dried over anhydrous Mg2SO4 and purified by
on silica gel (n-hexane: ethyl acetate = 6: 1). The eluted fractions were concentrated and filtered off. Layering n-hexane on the filtrate gave crystals (yield 23%), which were then recrystallized from ethyl acetate solution as yellow blocks.The carbon-bound hydrogen atoms were placed in geometrical positions [C–H 0.95 to 0.99 Å, Uiso(H) = 1.2Ueq(C)], and refined using a riding model. The hydrogen atom of the OH group was found to be located near N5 of the imine in a difference Fourier map, and refined with distance restraint [N–H 0.88 Å, Uiso(H) = 1.2Ueq(N)].
Data collection: WinAFC (Rigaku, 1999); cell
WinAFC (Rigaku, 1999); data reduction: WinAFC (Rigaku, 1999); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: CrystalStructure (Rigaku, 2010); software used to prepare material for publication: CrystalStructure (Rigaku, 2010).Fig. 1. The molecular structure of the title compound, with displacement ellipsoids drawn at the 50% probability level. |
C23H17Cl2NO2 | F(000) = 848.00 |
Mr = 410.30 | Dx = 1.456 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71069 Å |
Hall symbol: -P 2ybc | Cell parameters from 25 reflections |
a = 17.996 (8) Å | θ = 15.7–17.5° |
b = 9.127 (6) Å | µ = 0.37 mm−1 |
c = 11.649 (7) Å | T = 100 K |
β = 102.00 (4)° | Block, yellow |
V = 1871.5 (19) Å3 | 0.40 × 0.25 × 0.25 mm |
Z = 4 |
Rigaku AFC-7R diffractometer | θmax = 27.5° |
ω–2θ scans | h = −13→23 |
5086 measured reflections | k = 0→11 |
4254 independent reflections | l = −15→14 |
3499 reflections with F2 > 2σ(F2) | 3 standard reflections every 150 reflections |
Rint = 0.090 | intensity decay: −0.7% |
Refinement on F2 | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.045 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.115 | H-atom parameters constrained |
S = 1.01 | w = 1/[σ2(Fo2) + (0.0505P)2 + 2.0486P] where P = (Fo2 + 2Fc2)/3 |
4254 reflections | (Δ/σ)max < 0.001 |
253 parameters | Δρmax = 0.58 e Å−3 |
0 restraints | Δρmin = −0.69 e Å−3 |
Primary atom site location: structure-invariant direct methods |
C23H17Cl2NO2 | V = 1871.5 (19) Å3 |
Mr = 410.30 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 17.996 (8) Å | µ = 0.37 mm−1 |
b = 9.127 (6) Å | T = 100 K |
c = 11.649 (7) Å | 0.40 × 0.25 × 0.25 mm |
β = 102.00 (4)° |
Rigaku AFC-7R diffractometer | Rint = 0.090 |
5086 measured reflections | 3 standard reflections every 150 reflections |
4254 independent reflections | intensity decay: −0.7% |
3499 reflections with F2 > 2σ(F2) |
R[F2 > 2σ(F2)] = 0.045 | 0 restraints |
wR(F2) = 0.115 | H-atom parameters constrained |
S = 1.01 | Δρmax = 0.58 e Å−3 |
4254 reflections | Δρmin = −0.69 e Å−3 |
253 parameters |
Refinement. Refinement was performed using all reflections. The weighted R-factor (wR) and goodness of fit (S) are based on F2. R-factor (gt) are based on F. The threshold expression of F2 > 2.0 σ(F2) is used only for calculating R-factor (gt). |
x | y | z | Uiso*/Ueq | ||
Cl1 | 0.80025 (2) | 0.62806 (6) | 0.19342 (4) | 0.02502 (13) | |
Cl2 | 0.86878 (3) | 1.10381 (7) | 0.46874 (5) | 0.03284 (15) | |
O3 | 0.64501 (7) | 0.69744 (16) | 0.20224 (12) | 0.0213 (3) | |
O4 | 0.57129 (8) | 0.98666 (17) | 0.42256 (13) | 0.0251 (3) | |
N5 | 0.42765 (9) | 0.8598 (2) | 0.34156 (15) | 0.0228 (4) | |
C6 | 0.32275 (10) | 0.7096 (3) | 0.39377 (16) | 0.0189 (4) | |
C7 | 0.82564 (10) | 0.8699 (3) | 0.32979 (16) | 0.0193 (4) | |
C8 | 0.59004 (10) | 0.9131 (3) | 0.34336 (17) | 0.0203 (4) | |
C9 | 0.67152 (10) | 0.9075 (2) | 0.33128 (16) | 0.0181 (4) | |
C10 | 0.69432 (10) | 0.7945 (2) | 0.26495 (15) | 0.0174 (4) | |
C11 | 0.77212 (10) | 0.7748 (2) | 0.26781 (15) | 0.0177 (4) | |
C12 | 0.13573 (10) | 0.5180 (3) | 0.40462 (15) | 0.0188 (4) | |
C13 | 0.24573 (10) | 0.6722 (3) | 0.37163 (16) | 0.0192 (4) | |
C14 | 0.34775 (11) | 0.5149 (3) | 0.53488 (17) | 0.0244 (4) | |
C15 | 0.08092 (10) | 0.6104 (3) | 0.33894 (17) | 0.0216 (4) | |
C16 | −0.01848 (11) | 0.4374 (3) | 0.35077 (18) | 0.0271 (5) | |
C17 | 0.53989 (10) | 0.8232 (3) | 0.26182 (17) | 0.0206 (4) | |
C18 | 0.11133 (11) | 0.3843 (3) | 0.44211 (17) | 0.0240 (4) | |
C19 | 0.21812 (10) | 0.5583 (2) | 0.43059 (15) | 0.0174 (4) | |
C20 | 0.72538 (10) | 1.0033 (3) | 0.39433 (16) | 0.0199 (4) | |
C21 | 0.27091 (11) | 0.4809 (3) | 0.51376 (17) | 0.0234 (4) | |
C22 | 0.37403 (10) | 0.6290 (3) | 0.47505 (16) | 0.0211 (4) | |
C23 | 0.80161 (10) | 0.9837 (3) | 0.39174 (16) | 0.0209 (4) | |
C24 | 0.03495 (12) | 0.3446 (3) | 0.41568 (18) | 0.0278 (5) | |
C25 | 0.56977 (10) | 0.7595 (3) | 0.16214 (17) | 0.0214 (4) | |
C26 | 0.00452 (11) | 0.5703 (3) | 0.31196 (18) | 0.0254 (4) | |
C27 | 0.46441 (10) | 0.8011 (3) | 0.26553 (17) | 0.0213 (4) | |
C28 | 0.34598 (10) | 0.8407 (3) | 0.32960 (19) | 0.0245 (4) | |
H5 | 0.4531 | 0.9115 | 0.4006 | 0.0273* | |
H7 | 0.8781 | 0.8573 | 0.3298 | 0.0231* | |
H13 | 0.2111 | 0.7263 | 0.3145 | 0.0231* | |
H14 | 0.3827 | 0.4597 | 0.5908 | 0.0293* | |
H15 | 0.0960 | 0.7019 | 0.3123 | 0.0259* | |
H16 | −0.0706 | 0.4104 | 0.3329 | 0.0326* | |
H18 | 0.1475 | 0.3194 | 0.4864 | 0.0288* | |
H20 | 0.7101 | 1.0810 | 0.4385 | 0.0239* | |
H21 | 0.2539 | 0.4036 | 0.5565 | 0.0280* | |
H22 | 0.4267 | 0.6517 | 0.4897 | 0.0253* | |
H24 | 0.0195 | 0.2534 | 0.4423 | 0.0334* | |
H25A | 0.5347 | 0.6821 | 0.1236 | 0.0256* | |
H25B | 0.5720 | 0.8369 | 0.1034 | 0.0256* | |
H26 | −0.0319 | 0.6342 | 0.2668 | 0.0305* | |
H27 | 0.4362 | 0.7376 | 0.2079 | 0.0255* | |
H28A | 0.3226 | 0.8312 | 0.2452 | 0.0294* | |
H28B | 0.3250 | 0.9302 | 0.3589 | 0.0294* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl1 | 0.0160 (2) | 0.0271 (3) | 0.0341 (3) | −0.00033 (17) | 0.01027 (17) | −0.00751 (19) |
Cl2 | 0.0235 (3) | 0.0419 (4) | 0.0342 (3) | −0.0135 (2) | 0.00837 (19) | −0.0155 (3) |
O3 | 0.0121 (6) | 0.0221 (7) | 0.0293 (7) | −0.0002 (5) | 0.0033 (5) | −0.0028 (6) |
O4 | 0.0202 (7) | 0.0294 (8) | 0.0273 (7) | 0.0023 (6) | 0.0089 (6) | −0.0024 (6) |
N5 | 0.0145 (7) | 0.0272 (9) | 0.0273 (8) | −0.0018 (7) | 0.0056 (6) | 0.0010 (7) |
C6 | 0.0147 (8) | 0.0237 (10) | 0.0196 (8) | −0.0003 (7) | 0.0067 (7) | −0.0000 (7) |
C7 | 0.0139 (8) | 0.0257 (10) | 0.0186 (8) | −0.0009 (7) | 0.0043 (7) | 0.0031 (7) |
C8 | 0.0158 (8) | 0.0216 (9) | 0.0253 (9) | 0.0025 (7) | 0.0084 (7) | 0.0053 (8) |
C9 | 0.0153 (8) | 0.0213 (9) | 0.0188 (8) | 0.0012 (7) | 0.0058 (7) | 0.0042 (7) |
C10 | 0.0132 (8) | 0.0208 (9) | 0.0184 (8) | −0.0003 (7) | 0.0036 (6) | 0.0038 (7) |
C11 | 0.0146 (8) | 0.0213 (9) | 0.0186 (8) | 0.0025 (7) | 0.0069 (7) | 0.0016 (7) |
C12 | 0.0170 (8) | 0.0246 (10) | 0.0160 (8) | −0.0036 (7) | 0.0061 (7) | −0.0036 (7) |
C13 | 0.0156 (8) | 0.0226 (10) | 0.0204 (9) | 0.0011 (7) | 0.0058 (7) | 0.0017 (7) |
C14 | 0.0211 (9) | 0.0314 (11) | 0.0195 (9) | 0.0023 (8) | 0.0015 (7) | 0.0035 (8) |
C15 | 0.0191 (9) | 0.0237 (10) | 0.0230 (9) | −0.0020 (8) | 0.0066 (7) | −0.0003 (8) |
C16 | 0.0188 (9) | 0.0342 (12) | 0.0302 (10) | −0.0083 (8) | 0.0090 (8) | −0.0097 (9) |
C17 | 0.0149 (8) | 0.0227 (10) | 0.0247 (9) | 0.0019 (7) | 0.0050 (7) | 0.0045 (8) |
C18 | 0.0230 (9) | 0.0276 (11) | 0.0222 (9) | −0.0031 (8) | 0.0066 (7) | 0.0004 (8) |
C19 | 0.0158 (8) | 0.0219 (9) | 0.0156 (8) | −0.0009 (7) | 0.0058 (7) | −0.0021 (7) |
C20 | 0.0202 (9) | 0.0229 (9) | 0.0178 (8) | 0.0001 (8) | 0.0068 (7) | 0.0002 (7) |
C21 | 0.0231 (9) | 0.0276 (11) | 0.0202 (9) | −0.0036 (8) | 0.0061 (7) | 0.0043 (8) |
C22 | 0.0148 (8) | 0.0273 (10) | 0.0210 (9) | −0.0014 (8) | 0.0035 (7) | −0.0029 (8) |
C23 | 0.0188 (9) | 0.0260 (10) | 0.0180 (8) | −0.0064 (8) | 0.0041 (7) | 0.0000 (7) |
C24 | 0.0279 (11) | 0.0287 (11) | 0.0296 (10) | −0.0113 (9) | 0.0122 (8) | −0.0035 (9) |
C25 | 0.0126 (8) | 0.0242 (10) | 0.0264 (9) | −0.0002 (7) | 0.0019 (7) | 0.0004 (8) |
C26 | 0.0172 (9) | 0.0317 (11) | 0.0276 (10) | −0.0009 (8) | 0.0050 (8) | −0.0027 (9) |
C27 | 0.0171 (9) | 0.0222 (10) | 0.0243 (9) | −0.0014 (7) | 0.0037 (7) | 0.0048 (8) |
C28 | 0.0128 (8) | 0.0277 (11) | 0.0338 (11) | 0.0017 (8) | 0.0069 (7) | 0.0087 (9) |
Cl1—C11 | 1.727 (3) | C16—C24 | 1.383 (3) |
Cl2—C23 | 1.737 (2) | C16—C26 | 1.387 (4) |
O3—C10 | 1.355 (3) | C17—C25 | 1.495 (3) |
O3—C25 | 1.452 (3) | C17—C27 | 1.383 (3) |
O4—C8 | 1.243 (3) | C18—C24 | 1.393 (3) |
N5—C27 | 1.324 (3) | C19—C21 | 1.399 (3) |
N5—C28 | 1.458 (3) | C20—C23 | 1.390 (3) |
C6—C13 | 1.398 (3) | N5—H5 | 0.880 |
C6—C22 | 1.388 (3) | C7—H7 | 0.950 |
C6—C28 | 1.515 (3) | C13—H13 | 0.950 |
C7—C11 | 1.383 (3) | C14—H14 | 0.950 |
C7—C23 | 1.384 (3) | C15—H15 | 0.950 |
C8—C9 | 1.503 (3) | C16—H16 | 0.950 |
C8—C17 | 1.426 (3) | C18—H18 | 0.950 |
C9—C10 | 1.400 (3) | C20—H20 | 0.950 |
C9—C20 | 1.395 (3) | C21—H21 | 0.950 |
C10—C11 | 1.405 (3) | C22—H22 | 0.950 |
C12—C15 | 1.398 (3) | C24—H24 | 0.950 |
C12—C18 | 1.397 (3) | C25—H25A | 0.990 |
C12—C19 | 1.496 (3) | C25—H25B | 0.990 |
C13—C19 | 1.393 (3) | C26—H26 | 0.950 |
C14—C21 | 1.388 (3) | C27—H27 | 0.950 |
C14—C22 | 1.390 (3) | C28—H28A | 0.990 |
C15—C26 | 1.394 (3) | C28—H28B | 0.990 |
C10—O3—C25 | 112.38 (16) | C15—C26—C16 | 120.20 (19) |
C27—N5—C28 | 121.46 (17) | N5—C27—C17 | 126.35 (18) |
C13—C6—C22 | 119.33 (19) | N5—C28—C6 | 115.05 (16) |
C13—C6—C28 | 117.78 (16) | C27—N5—H5 | 119.284 |
C22—C6—C28 | 122.86 (17) | C28—N5—H5 | 119.257 |
C11—C7—C23 | 118.94 (18) | C11—C7—H7 | 120.532 |
O4—C8—C9 | 120.57 (17) | C23—C7—H7 | 120.528 |
O4—C8—C17 | 124.98 (18) | C6—C13—H13 | 118.915 |
C9—C8—C17 | 114.38 (18) | C19—C13—H13 | 118.918 |
C8—C9—C10 | 118.70 (17) | C21—C14—H14 | 119.697 |
C8—C9—C20 | 120.93 (18) | C22—C14—H14 | 119.698 |
C10—C9—C20 | 120.04 (18) | C12—C15—H15 | 119.481 |
O3—C10—C9 | 123.01 (17) | C26—C15—H15 | 119.484 |
O3—C10—C11 | 117.81 (17) | C24—C16—H16 | 120.227 |
C9—C10—C11 | 119.09 (16) | C26—C16—H16 | 120.219 |
Cl1—C11—C7 | 120.24 (15) | C12—C18—H18 | 119.399 |
Cl1—C11—C10 | 118.81 (14) | C24—C18—H18 | 119.395 |
C7—C11—C10 | 120.95 (18) | C9—C20—H20 | 120.358 |
C15—C12—C18 | 117.77 (17) | C23—C20—H20 | 120.373 |
C15—C12—C19 | 121.26 (18) | C14—C21—H21 | 119.425 |
C18—C12—C19 | 120.95 (17) | C19—C21—H21 | 119.422 |
C6—C13—C19 | 122.17 (17) | C6—C22—H22 | 120.266 |
C21—C14—C22 | 120.61 (18) | C14—C22—H22 | 120.267 |
C12—C15—C26 | 121.0 (2) | C16—C24—H24 | 119.886 |
C24—C16—C26 | 119.55 (19) | C18—C24—H24 | 119.877 |
C8—C17—C25 | 117.46 (17) | O3—C25—H25A | 109.370 |
C8—C17—C27 | 123.6 (2) | O3—C25—H25B | 109.364 |
C25—C17—C27 | 118.80 (17) | C17—C25—H25A | 109.360 |
C12—C18—C24 | 121.21 (19) | C17—C25—H25B | 109.359 |
C12—C19—C13 | 121.59 (16) | H25A—C25—H25B | 107.995 |
C12—C19—C21 | 121.14 (18) | C15—C26—H26 | 119.894 |
C13—C19—C21 | 117.25 (17) | C16—C26—H26 | 119.907 |
C9—C20—C23 | 119.27 (19) | N5—C27—H27 | 116.830 |
C14—C21—C19 | 121.2 (2) | C17—C27—H27 | 116.823 |
C6—C22—C14 | 119.47 (18) | N5—C28—H28A | 108.504 |
Cl2—C23—C7 | 118.91 (15) | N5—C28—H28B | 108.510 |
Cl2—C23—C20 | 119.46 (16) | C6—C28—H28A | 108.504 |
C7—C23—C20 | 121.62 (18) | C6—C28—H28B | 108.506 |
C16—C24—C18 | 120.2 (3) | H28A—C28—H28B | 107.520 |
O3—C25—C17 | 111.33 (15) | ||
C10—O3—C25—C17 | −53.6 (2) | C15—C12—C18—H18 | 179.6 |
C10—O3—C25—H25A | −174.6 | C18—C12—C15—C26 | 0.1 (3) |
C10—O3—C25—H25B | 67.3 | C18—C12—C15—H15 | −179.9 |
C25—O3—C10—C9 | 29.1 (3) | C15—C12—C19—C13 | −13.5 (3) |
C25—O3—C10—C11 | −154.42 (15) | C15—C12—C19—C21 | 167.82 (17) |
C27—N5—C28—C6 | 91.3 (3) | C19—C12—C15—C26 | 178.03 (16) |
C27—N5—C28—H28A | −30.5 | C19—C12—C15—H15 | −2.0 |
C27—N5—C28—H28B | −147.0 | C18—C12—C19—C13 | 164.43 (17) |
C28—N5—C27—C17 | 173.51 (17) | C18—C12—C19—C21 | −14.3 (3) |
C28—N5—C27—H27 | −6.5 | C19—C12—C18—C24 | −178.38 (16) |
H5—N5—C27—C17 | −6.5 | C19—C12—C18—H18 | 1.6 |
H5—N5—C27—H27 | 173.5 | C6—C13—C19—C12 | −179.00 (16) |
H5—N5—C28—C6 | −88.7 | C6—C13—C19—C21 | −0.3 (3) |
H5—N5—C28—H28A | 149.5 | H13—C13—C19—C12 | 1.0 |
H5—N5—C28—H28B | 33.0 | H13—C13—C19—C21 | 179.7 |
C13—C6—C22—C14 | −1.5 (3) | C21—C14—C22—C6 | 0.2 (3) |
C13—C6—C22—H22 | 178.6 | C21—C14—C22—H22 | −179.8 |
C22—C6—C13—C19 | 1.5 (3) | C22—C14—C21—C19 | 1.1 (3) |
C22—C6—C13—H13 | −178.5 | C22—C14—C21—H21 | −178.9 |
C13—C6—C28—N5 | −170.51 (17) | H14—C14—C21—C19 | −178.9 |
C13—C6—C28—H28A | −48.8 | H14—C14—C21—H21 | 1.1 |
C13—C6—C28—H28B | 67.8 | H14—C14—C22—C6 | −179.8 |
C28—C6—C13—C19 | −176.64 (17) | H14—C14—C22—H22 | 0.2 |
C28—C6—C13—H13 | 3.4 | C12—C15—C26—C16 | 0.4 (3) |
C22—C6—C28—N5 | 11.4 (3) | C12—C15—C26—H26 | −179.6 |
C22—C6—C28—H28A | 133.1 | H15—C15—C26—C16 | −179.6 |
C22—C6—C28—H28B | −110.3 | H15—C15—C26—H26 | 0.4 |
C28—C6—C22—C14 | 176.60 (17) | C24—C16—C26—C15 | −0.4 (4) |
C28—C6—C22—H22 | −3.4 | C24—C16—C26—H26 | 179.5 |
C11—C7—C23—Cl2 | −179.57 (15) | C26—C16—C24—C18 | 0.1 (4) |
C11—C7—C23—C20 | 0.9 (3) | C26—C16—C24—H24 | −179.9 |
C23—C7—C11—Cl1 | −177.89 (15) | H16—C16—C24—C18 | −179.9 |
C23—C7—C11—C10 | 1.5 (3) | H16—C16—C24—H24 | 0.1 |
H7—C7—C11—Cl1 | 2.1 | H16—C16—C26—C15 | 179.6 |
H7—C7—C11—C10 | −178.5 | H16—C16—C26—H26 | −0.5 |
H7—C7—C23—Cl2 | 0.4 | C8—C17—C25—O3 | 45.8 (3) |
H7—C7—C23—C20 | −179.1 | C8—C17—C25—H25A | 166.8 |
O4—C8—C9—C10 | 162.18 (17) | C8—C17—C25—H25B | −75.2 |
O4—C8—C9—C20 | −11.3 (3) | C8—C17—C27—N5 | 1.2 (4) |
O4—C8—C17—C25 | 171.54 (17) | C8—C17—C27—H27 | −178.8 |
O4—C8—C17—C27 | −3.7 (3) | C25—C17—C27—N5 | −173.96 (17) |
C9—C8—C17—C25 | −11.6 (3) | C25—C17—C27—H27 | 6.0 |
C9—C8—C17—C27 | 173.26 (16) | C27—C17—C25—O3 | −138.79 (17) |
C17—C8—C9—C10 | −14.9 (3) | C27—C17—C25—H25A | −17.8 |
C17—C8—C9—C20 | 171.67 (16) | C27—C17—C25—H25B | 100.2 |
C8—C9—C10—O3 | 6.2 (3) | C12—C18—C24—C16 | 0.3 (3) |
C8—C9—C10—C11 | −170.28 (15) | C12—C18—C24—H24 | −179.7 |
C8—C9—C20—C23 | 172.43 (15) | H18—C18—C24—C16 | −179.7 |
C8—C9—C20—H20 | −7.6 | H18—C18—C24—H24 | 0.3 |
C10—C9—C20—C23 | −0.9 (3) | C12—C19—C21—C14 | 177.69 (16) |
C10—C9—C20—H20 | 179.1 | C12—C19—C21—H21 | −2.3 |
C20—C9—C10—O3 | 179.67 (16) | C13—C19—C21—C14 | −1.1 (3) |
C20—C9—C10—C11 | 3.2 (3) | C13—C19—C21—H21 | 178.9 |
O3—C10—C11—Cl1 | −0.8 (3) | C9—C20—C23—Cl2 | 179.29 (15) |
O3—C10—C11—C7 | 179.83 (14) | C9—C20—C23—C7 | −1.2 (3) |
C9—C10—C11—Cl1 | 175.86 (14) | H20—C20—C23—Cl2 | −0.7 |
C9—C10—C11—C7 | −3.5 (3) | H20—C20—C23—C7 | 178.8 |
C15—C12—C18—C24 | −0.4 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
N5—H5···O4 | 0.88 | 2.20 | 2.811 (3) | 126 |
N5—H5···O4i | 0.88 | 2.38 | 3.081 (3) | 137 |
C25—H25A···O4ii | 0.99 | 2.59 | 3.546 (4) | 164 |
Symmetry codes: (i) −x+1, −y+2, −z+1; (ii) −x+1, y−1/2, −z+1/2. |
D—H···A | D—H | H···A | D···A | D—H···A |
N5—H5···O4 | 0.88 | 2.20 | 2.811 (3) | 126 |
N5—H5···O4i | 0.88 | 2.38 | 3.081 (3) | 137 |
C25—H25A···O4ii | 0.99 | 2.59 | 3.546 (4) | 164 |
Symmetry codes: (i) −x+1, −y+2, −z+1; (ii) −x+1, y−1/2, −z+1/2. |
Acknowledgements
We acknowledge the University of Shizuoka for supporting this study.
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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.
Schiff bases of 3-formyl chromones have attracted much attention due to their biological functions such as enzyme inhibition (Khan et al. 2009; Tu et al. 2013). Here we report the crystal structure of the title compound, which was obtained from the condensation reaction of 6,8-dichloro-3-formylchromone with 3-phenylbenzylamine and successive reduction with 2-picoline borane. The structure shows that the H atom of the –OH group is transferred to the N5 atom of the imine, thus forming a zwitterion. As a result, an intramolecular O···H–N [O···N = 2.811 (3) Å], rather than O–H···N, hydrogen bond is formed. The bond distances O4–C8 [1.243 (3) Å], C8–C17 [1.426 (3) Å], C17–C27 [1.383 (3) Å] and C27–N5 [1.324 (3) Å] and torsion angles O4–C8–C17–C27 [–3.7 (3)°] and C8–C17–C27–N5 [1.2 (4)°] in the six-membered ring indicate charge delocalization among the atoms. This effect might be responsible for the preferential reduction of the α,β-unsaturated carbonyl of the synthetic intermediate, rather than reduction of the imine. The dihedral angle between the phenyl rings of the biphenyl group is 13.88 (10) °.
In the crystal, inversion dimers linked by pairs of N—H···O hydrogen bonds occur and the packing is consolidated by C—H···O interactions.