organic compounds
3-(2-Amino-1-methyl-4-oxo-4,5-dihydro-1H-imidazol-5-yl)-3-hydroxy-1-phenylindolin-2-one ethanol solvate
aDepartment of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, KY 40536, USA, and bDepartment of Chemistry, University of Kentucky, Lexington, KY 40506, USA
*Correspondence e-mail: pcrooks@email.uky.edu
In the title compound, C18H16N4O3·C2H5OH, molecules are linked into chains by a series of intermolecular N—H⋯O, N—H⋯N and O—H⋯O hydrogen bonds which stabilize the The indole and creatinine units make a dihedral angle of 56.45 (4)°. The title compound has two chiral centres. The indicates the compound is racemic (RR and SS).
Related literature
For the biological activity of isatin and its derivatives, see: Pandeya et al. (2005). The endogenous oxindoles 5-hydroxyoxindole and isatin are antiproliferative and proapoptotic, see: Cane et al. (2000). For in vitro cytotoxicity evaluation of some substituted isatin derivatives, see: Vine et al. (2007). 2-Indol-3-yl-methylenequinuclidin-3-ols and NADPH oxidase activity has been reported by Sekhar et al. (2003), and novel substituted (Z)-2-(N-benzylindol-3-ylmethylene)quinuclidin-3-one and (Z)-(±)-2-(N-benzylindol-3-yl methylene)quinuclidin-3-ol derivatives as potent thermal sensitizing agents by Sonar et al. (2007). For the crystal and molecular structure of isatin, see: Frolova et al. (1988). For the structure of 3-(2-amino-1-methyl-4-oxo-4,5-dihydro-1H-imidazol-5-yl)-3-hydroxyindolin-2-one monohydrate, see: Penthala et al. (2009) and of 1,1′-diacetyl-3-hydroxy-2,2′,3,3′-tetrahydro-3,3′-bi(1H-indole)-2,2′-dione, see: Usman et al. (2002). The aldol condensation enolate mechanism via a six-membered transition state has been described by Zimmerman & Traxler (1957).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2006); cell SAINT (Bruker, 2006); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97 and local procedures.
Supporting information
10.1107/S1600536809033881/hg2557sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536809033881/hg2557Isup2.hkl
A mixture of N-phenyl isatin (1 mmol), creatinine (1.1 mmol) and sodium acetate (1.2 mmol) in acetic acid (1 ml) was irradiated in a domestic microwave oven for 30 sec with intermittent cooling every 5 sec. The reaction mixture was allowed to cool to room temperature, 10 ml of saturated sodium bicarbonate solution was added and the mixture was stirred for 10 minutes. The precipitate thus obtained was collected by filtration, washed with cold water and dried to afford the crude product. Crystallization from ethyl alcohol gave a white crystalline product of 3-(2-amino-1-methyl-4-oxo-4,5-dihydro-1H- imidazol-5-yl)-3-hydroxy-1-phenylindolin-2-one ethanolate which was suitable for X-ray analysis. 1H NMR (DMSO-d6): δ 3.25 (s, 3H), 4.22 (s, 1H), 6.62 (s, 1H, OH), 6.64–6.65 (d, J=2.4 Hz, 1H), 7.00–7.03 (t, J=7.5 Hz, 1H), 7.17–7.23 (m, 2H), 7.44–7.47 (m, 4H), 7.55–7.57 (d, J=7.5 Hz, 1H), 7.60 (bs, 2H, NH2) p.p.m.; 13C NMR (DMSO-d6): δ 33.02, 70.60, 76.26, 108.92, 122.74, 124.38, 126.95, 127.10, 128.13, 129.60, 129.86, 134.40, 143.93, 171.90, 174.09, 182.53 p.p.m..
H atoms were found in difference Fourier maps and subsequently placed in idealized positions with constrained distances of 0.98 Å (RCH3), 0.99 Å (R2CH2), 1.00 Å (R3CH), 0.95 Å (CArH), 0.84 Å (O—H), 0.88 Å (N—H), and with Uiso(H) values set to either 1.2Ueq or 1.5Ueq (RCH3, OH) of the attached atom.
Data collection: APEX2 (Bruker, 2006); cell
SAINT (Bruker, 2006); data reduction: SAINT (Bruker, 2006); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008) and local procedures.Fig. 1. A view of the molecule with the atom numbering scheme. Displacement ellipsoids are drawn at the 50% probability level. |
C18H16N4O3·C2H6O | Z = 2 |
Mr = 382.42 | F(000) = 404 |
Triclinic, P1 | Dx = 1.391 Mg m−3 |
Hall symbol: -P 1 | Cu Kα radiation, λ = 1.54178 Å |
a = 7.4912 (1) Å | Cell parameters from 9955 reflections |
b = 11.0018 (2) Å | θ = 3.8–68.3° |
c = 12.0835 (2) Å | µ = 0.82 mm−1 |
α = 78.152 (1)° | T = 90 K |
β = 74.413 (1)° | Block, colourless |
γ = 74.090 (1)° | 0.11 × 0.11 × 0.08 mm |
V = 913.15 (3) Å3 |
Bruker X8 Proteum diffractometer | 3294 independent reflections |
Radiation source: fine-focus rotating anode | 3126 reflections with I > 2σ(I) |
Graded multilayer optics monochromator | Rint = 0.035 |
Detector resolution: 5.6 pixels mm-1 | θmax = 68.3°, θmin = 3.8° |
ϕ and ω scans | h = −9→9 |
Absorption correction: multi-scan (SADABS in APEX2; Bruker, 2006) | k = −13→10 |
Tmin = 0.828, Tmax = 0.938 | l = −14→14 |
13576 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)] = 0.037 | H-atom parameters constrained |
wR(F2) = 0.098 | w = 1/[σ^2^(Fo^2^) + (0.0501P)^2^ + 0.3708P] whereP = (Fo^2^ + 2Fc^2^)/3 |
S = 1.07 | (Δ/σ)max < 0.001 |
3294 reflections | Δρmax = 0.37 e Å−3 |
258 parameters | Δρmin = −0.41 e Å−3 |
0 restraints | Extinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.0068 (7) |
C18H16N4O3·C2H6O | γ = 74.090 (1)° |
Mr = 382.42 | V = 913.15 (3) Å3 |
Triclinic, P1 | Z = 2 |
a = 7.4912 (1) Å | Cu Kα radiation |
b = 11.0018 (2) Å | µ = 0.82 mm−1 |
c = 12.0835 (2) Å | T = 90 K |
α = 78.152 (1)° | 0.11 × 0.11 × 0.08 mm |
β = 74.413 (1)° |
Bruker X8 Proteum diffractometer | 3294 independent reflections |
Absorption correction: multi-scan (SADABS in APEX2; Bruker, 2006) | 3126 reflections with I > 2σ(I) |
Tmin = 0.828, Tmax = 0.938 | Rint = 0.035 |
13576 measured reflections |
R[F2 > 2σ(F2)] = 0.037 | 0 restraints |
wR(F2) = 0.098 | H-atom parameters constrained |
S = 1.07 | Δρmax = 0.37 e Å−3 |
3294 reflections | Δρmin = −0.41 e Å−3 |
258 parameters |
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 F^2^ against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F^2^, conventional R-factors R are based on F, with F set to zero for negative F^2^. The threshold expression of F^2^ > 2σ(F^2^) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F^2^ 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 | 0.37921 (12) | 0.08545 (8) | 0.23487 (7) | 0.0188 (2) | |
N1 | 0.16513 (14) | 0.24923 (9) | 0.32617 (8) | 0.0159 (2) | |
C1 | 0.29249 (17) | 0.19721 (11) | 0.23418 (10) | 0.0161 (3) | |
O2 | 0.50070 (12) | 0.30752 (8) | 0.07786 (7) | 0.0202 (2) | |
H2 | 0.5529 | 0.3158 | 0.1284 | 0.030* | |
N2 | 0.03753 (14) | 0.13607 (10) | 0.04645 (8) | 0.0174 (2) | |
C2 | 0.30826 (17) | 0.30455 (11) | 0.12863 (10) | 0.0173 (3) | |
O3 | −0.10708 (12) | 0.31235 (9) | 0.14096 (8) | 0.0232 (2) | |
N3 | 0.26263 (14) | 0.00056 (10) | −0.07643 (9) | 0.0185 (2) | |
H3A | 0.3780 | −0.0201 | −0.1202 | 0.022* | |
H3B | 0.1798 | −0.0454 | −0.0697 | 0.022* | |
C3 | 0.18841 (17) | 0.42116 (12) | 0.18239 (10) | 0.0178 (3) | |
N4 | 0.33379 (14) | 0.17486 (10) | −0.02748 (8) | 0.0175 (2) | |
C4 | 0.15762 (18) | 0.54854 (12) | 0.13580 (11) | 0.0210 (3) | |
H4 | 0.2148 | 0.5746 | 0.0573 | 0.025* | |
C5 | 0.04026 (19) | 0.63828 (12) | 0.20688 (11) | 0.0222 (3) | |
H5 | 0.0180 | 0.7266 | 0.1768 | 0.027* | |
C6 | −0.04402 (18) | 0.59920 (12) | 0.32105 (11) | 0.0212 (3) | |
H6 | −0.1239 | 0.6615 | 0.3680 | 0.025* | |
C7 | −0.01412 (17) | 0.47040 (12) | 0.36854 (10) | 0.0183 (3) | |
H7 | −0.0728 | 0.4437 | 0.4465 | 0.022* | |
C8 | 0.10411 (17) | 0.38371 (11) | 0.29745 (10) | 0.0168 (3) | |
C9 | 0.12524 (17) | 0.18231 (11) | 0.44190 (10) | 0.0161 (3) | |
C10 | 0.27258 (18) | 0.12805 (11) | 0.49893 (11) | 0.0192 (3) | |
H10 | 0.3994 | 0.1339 | 0.4615 | 0.023* | |
C11 | 0.2316 (2) | 0.06493 (12) | 0.61182 (11) | 0.0233 (3) | |
H11 | 0.3312 | 0.0268 | 0.6516 | 0.028* | |
C12 | 0.0459 (2) | 0.05757 (12) | 0.66629 (11) | 0.0247 (3) | |
H12 | 0.0185 | 0.0150 | 0.7435 | 0.030* | |
C13 | −0.10000 (19) | 0.11217 (12) | 0.60827 (11) | 0.0233 (3) | |
H13 | −0.2271 | 0.1071 | 0.6460 | 0.028* | |
C14 | −0.06071 (18) | 0.17416 (12) | 0.49517 (11) | 0.0195 (3) | |
H14 | −0.1599 | 0.2105 | 0.4548 | 0.023* | |
C15 | 0.22403 (17) | 0.28338 (11) | 0.03230 (10) | 0.0173 (3) | |
H15 | 0.2094 | 0.3626 | −0.0256 | 0.021* | |
C16 | 0.03012 (17) | 0.24701 (12) | 0.08034 (10) | 0.0175 (3) | |
C17 | 0.21402 (17) | 0.09987 (11) | −0.02122 (10) | 0.0162 (3) | |
C18 | 0.49912 (18) | 0.18208 (12) | −0.12386 (10) | 0.0207 (3) | |
H18A | 0.5813 | 0.0964 | −0.1304 | 0.031* | |
H18B | 0.5707 | 0.2375 | −0.1096 | 0.031* | |
H18C | 0.4562 | 0.2172 | −0.1962 | 0.031* | |
O1S | 0.57472 (13) | 0.29564 (10) | 0.30873 (9) | 0.0304 (3) | |
H1S | 0.6853 | 0.2952 | 0.2685 | 0.046* | |
C1S | 0.5142 (2) | 0.39650 (15) | 0.37674 (14) | 0.0336 (3) | |
H1S1 | 0.5991 | 0.3811 | 0.4309 | 0.040* | |
H1S2 | 0.3837 | 0.3965 | 0.4237 | 0.040* | |
C2S | 0.5151 (2) | 0.52356 (16) | 0.30585 (16) | 0.0413 (4) | |
H2S1 | 0.6444 | 0.5248 | 0.2601 | 0.062* | |
H2S2 | 0.4729 | 0.5894 | 0.3570 | 0.062* | |
H2S3 | 0.4285 | 0.5405 | 0.2535 | 0.062* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0220 (4) | 0.0146 (4) | 0.0180 (4) | −0.0041 (3) | −0.0011 (3) | −0.0034 (3) |
N1 | 0.0206 (5) | 0.0124 (5) | 0.0138 (5) | −0.0041 (4) | −0.0026 (4) | −0.0012 (4) |
C1 | 0.0187 (6) | 0.0160 (6) | 0.0152 (6) | −0.0067 (5) | −0.0032 (5) | −0.0030 (4) |
O2 | 0.0216 (5) | 0.0249 (5) | 0.0171 (4) | −0.0115 (4) | −0.0028 (3) | −0.0033 (3) |
N2 | 0.0185 (5) | 0.0188 (5) | 0.0149 (5) | −0.0057 (4) | −0.0020 (4) | −0.0028 (4) |
C2 | 0.0216 (6) | 0.0160 (6) | 0.0145 (6) | −0.0076 (5) | −0.0020 (5) | −0.0016 (5) |
O3 | 0.0225 (5) | 0.0246 (5) | 0.0212 (5) | −0.0051 (4) | 0.0000 (4) | −0.0080 (4) |
N3 | 0.0177 (5) | 0.0193 (5) | 0.0199 (5) | −0.0067 (4) | −0.0011 (4) | −0.0068 (4) |
C3 | 0.0231 (6) | 0.0168 (6) | 0.0160 (6) | −0.0068 (5) | −0.0061 (5) | −0.0026 (5) |
N4 | 0.0191 (5) | 0.0193 (5) | 0.0151 (5) | −0.0075 (4) | 0.0000 (4) | −0.0056 (4) |
C4 | 0.0289 (7) | 0.0183 (6) | 0.0182 (6) | −0.0084 (5) | −0.0086 (5) | 0.0002 (5) |
C5 | 0.0306 (7) | 0.0136 (6) | 0.0253 (7) | −0.0054 (5) | −0.0126 (5) | −0.0003 (5) |
C6 | 0.0253 (6) | 0.0173 (6) | 0.0234 (6) | −0.0017 (5) | −0.0096 (5) | −0.0068 (5) |
C7 | 0.0220 (6) | 0.0179 (6) | 0.0165 (6) | −0.0048 (5) | −0.0061 (5) | −0.0033 (5) |
C8 | 0.0215 (6) | 0.0140 (6) | 0.0173 (6) | −0.0058 (5) | −0.0071 (5) | −0.0017 (4) |
C9 | 0.0236 (6) | 0.0110 (5) | 0.0131 (6) | −0.0043 (4) | −0.0017 (5) | −0.0028 (4) |
C10 | 0.0230 (6) | 0.0150 (6) | 0.0188 (6) | −0.0033 (5) | −0.0032 (5) | −0.0042 (5) |
C11 | 0.0337 (7) | 0.0156 (6) | 0.0194 (6) | −0.0009 (5) | −0.0089 (5) | −0.0024 (5) |
C12 | 0.0409 (8) | 0.0152 (6) | 0.0154 (6) | −0.0078 (5) | −0.0014 (5) | −0.0011 (5) |
C13 | 0.0280 (7) | 0.0191 (6) | 0.0206 (6) | −0.0099 (5) | 0.0044 (5) | −0.0053 (5) |
C14 | 0.0221 (6) | 0.0162 (6) | 0.0203 (6) | −0.0047 (5) | −0.0032 (5) | −0.0043 (5) |
C15 | 0.0216 (6) | 0.0165 (6) | 0.0140 (6) | −0.0060 (5) | −0.0023 (5) | −0.0029 (4) |
C16 | 0.0201 (6) | 0.0190 (6) | 0.0130 (5) | −0.0053 (5) | −0.0032 (5) | −0.0014 (4) |
C17 | 0.0186 (6) | 0.0179 (6) | 0.0126 (5) | −0.0056 (5) | −0.0039 (4) | −0.0005 (4) |
C18 | 0.0218 (6) | 0.0246 (6) | 0.0164 (6) | −0.0099 (5) | 0.0011 (5) | −0.0054 (5) |
O1S | 0.0213 (5) | 0.0303 (5) | 0.0384 (6) | −0.0077 (4) | −0.0007 (4) | −0.0078 (4) |
C1S | 0.0254 (7) | 0.0339 (8) | 0.0426 (9) | −0.0049 (6) | −0.0067 (6) | −0.0115 (7) |
C2S | 0.0424 (9) | 0.0358 (9) | 0.0530 (10) | −0.0102 (7) | −0.0231 (8) | −0.0044 (7) |
O1—C1 | 1.2226 (15) | C7—C8 | 1.3770 (17) |
N1—C1 | 1.3658 (15) | C7—H7 | 0.9500 |
N1—C8 | 1.4220 (15) | C9—C14 | 1.3876 (18) |
N1—C9 | 1.4353 (15) | C9—C10 | 1.3886 (18) |
C1—C2 | 1.5531 (16) | C10—C11 | 1.3929 (18) |
O2—C2 | 1.4136 (15) | C10—H10 | 0.9500 |
O2—H2 | 0.8400 | C11—C12 | 1.386 (2) |
N2—C16 | 1.3477 (16) | C11—H11 | 0.9500 |
N2—C17 | 1.3562 (15) | C12—C13 | 1.388 (2) |
C2—C3 | 1.5071 (17) | C12—H12 | 0.9500 |
C2—C15 | 1.5472 (16) | C13—C14 | 1.3895 (18) |
O3—C16 | 1.2314 (15) | C13—H13 | 0.9500 |
N3—C17 | 1.3123 (16) | C14—H14 | 0.9500 |
N3—H3A | 0.8800 | C15—C16 | 1.5419 (17) |
N3—H3B | 0.8800 | C15—H15 | 1.0000 |
C3—C4 | 1.3794 (17) | C18—H18A | 0.9800 |
C3—C8 | 1.3918 (17) | C18—H18B | 0.9800 |
N4—C17 | 1.3546 (16) | C18—H18C | 0.9800 |
N4—C15 | 1.4560 (15) | O1S—C1S | 1.4181 (18) |
N4—C18 | 1.4621 (15) | O1S—H1S | 0.8400 |
C4—C5 | 1.3972 (18) | C1S—C2S | 1.483 (2) |
C4—H4 | 0.9500 | C1S—H1S1 | 0.9900 |
C5—C6 | 1.3870 (19) | C1S—H1S2 | 0.9900 |
C5—H5 | 0.9500 | C2S—H2S1 | 0.9800 |
C6—C7 | 1.3960 (18) | C2S—H2S2 | 0.9800 |
C6—H6 | 0.9500 | C2S—H2S3 | 0.9800 |
C1—N1—C8 | 110.74 (10) | C12—C11—C10 | 120.23 (12) |
C1—N1—C9 | 124.57 (10) | C12—C11—H11 | 119.9 |
C8—N1—C9 | 123.74 (10) | C10—C11—H11 | 119.9 |
O1—C1—N1 | 125.87 (11) | C11—C12—C13 | 120.17 (12) |
O1—C1—C2 | 125.91 (10) | C11—C12—H12 | 119.9 |
N1—C1—C2 | 108.21 (10) | C13—C12—H12 | 119.9 |
C2—O2—H2 | 109.5 | C12—C13—C14 | 120.17 (12) |
C16—N2—C17 | 106.75 (10) | C12—C13—H13 | 119.9 |
O2—C2—C3 | 115.27 (10) | C14—C13—H13 | 119.9 |
O2—C2—C15 | 106.63 (9) | C9—C14—C13 | 119.20 (12) |
C3—C2—C15 | 110.59 (10) | C9—C14—H14 | 120.4 |
O2—C2—C1 | 111.04 (9) | C13—C14—H14 | 120.4 |
C3—C2—C1 | 101.86 (9) | N4—C15—C16 | 100.87 (9) |
C15—C2—C1 | 111.52 (9) | N4—C15—C2 | 114.64 (10) |
C17—N3—H3A | 120.0 | C16—C15—C2 | 112.68 (9) |
C17—N3—H3B | 120.0 | N4—C15—H15 | 109.4 |
H3A—N3—H3B | 120.0 | C16—C15—H15 | 109.4 |
C4—C3—C8 | 120.49 (11) | C2—C15—H15 | 109.4 |
C4—C3—C2 | 130.40 (11) | O3—C16—N2 | 127.04 (11) |
C8—C3—C2 | 109.10 (10) | O3—C16—C15 | 123.08 (11) |
C17—N4—C15 | 107.56 (10) | N2—C16—C15 | 109.88 (10) |
C17—N4—C18 | 122.36 (10) | N3—C17—N4 | 123.26 (11) |
C15—N4—C18 | 122.80 (10) | N3—C17—N2 | 122.16 (11) |
C3—C4—C5 | 118.36 (11) | N4—C17—N2 | 114.58 (10) |
C3—C4—H4 | 120.8 | N4—C18—H18A | 109.5 |
C5—C4—H4 | 120.8 | N4—C18—H18B | 109.5 |
C6—C5—C4 | 120.40 (11) | H18A—C18—H18B | 109.5 |
C6—C5—H5 | 119.8 | N4—C18—H18C | 109.5 |
C4—C5—H5 | 119.8 | H18A—C18—H18C | 109.5 |
C5—C6—C7 | 121.51 (12) | H18B—C18—H18C | 109.5 |
C5—C6—H6 | 119.2 | C1S—O1S—H1S | 109.5 |
C7—C6—H6 | 119.2 | O1S—C1S—C2S | 112.92 (14) |
C8—C7—C6 | 117.14 (11) | O1S—C1S—H1S1 | 109.0 |
C8—C7—H7 | 121.4 | C2S—C1S—H1S1 | 109.0 |
C6—C7—H7 | 121.4 | O1S—C1S—H1S2 | 109.0 |
C7—C8—C3 | 122.10 (11) | C2S—C1S—H1S2 | 109.0 |
C7—C8—N1 | 128.13 (11) | H1S1—C1S—H1S2 | 107.8 |
C3—C8—N1 | 109.73 (10) | C1S—C2S—H2S1 | 109.5 |
C14—C9—C10 | 121.20 (11) | C1S—C2S—H2S2 | 109.5 |
C14—C9—N1 | 119.23 (11) | H2S1—C2S—H2S2 | 109.5 |
C10—C9—N1 | 119.56 (11) | C1S—C2S—H2S3 | 109.5 |
C9—C10—C11 | 119.02 (12) | H2S1—C2S—H2S3 | 109.5 |
C9—C10—H10 | 120.5 | H2S2—C2S—H2S3 | 109.5 |
C11—C10—H10 | 120.5 | ||
C8—N1—C1—O1 | 174.88 (11) | C1—N1—C9—C10 | 57.36 (16) |
C9—N1—C1—O1 | 5.70 (19) | C8—N1—C9—C10 | −110.45 (13) |
C8—N1—C1—C2 | −5.06 (13) | C14—C9—C10—C11 | −0.27 (18) |
C9—N1—C1—C2 | −174.24 (10) | N1—C9—C10—C11 | 179.09 (10) |
O1—C1—C2—O2 | −50.77 (15) | C9—C10—C11—C12 | −0.49 (18) |
N1—C1—C2—O2 | 129.18 (10) | C10—C11—C12—C13 | 0.53 (19) |
O1—C1—C2—C3 | −174.02 (12) | C11—C12—C13—C14 | 0.19 (19) |
N1—C1—C2—C3 | 5.93 (12) | C10—C9—C14—C13 | 0.99 (18) |
O1—C1—C2—C15 | 68.01 (15) | N1—C9—C14—C13 | −178.38 (11) |
N1—C1—C2—C15 | −112.05 (11) | C12—C13—C14—C9 | −0.94 (18) |
O2—C2—C3—C4 | 53.97 (17) | C17—N4—C15—C16 | 4.68 (12) |
C15—C2—C3—C4 | −67.06 (16) | C18—N4—C15—C16 | 155.35 (10) |
C1—C2—C3—C4 | 174.30 (13) | C17—N4—C15—C2 | 126.01 (10) |
O2—C2—C3—C8 | −125.10 (11) | C18—N4—C15—C2 | −83.31 (13) |
C15—C2—C3—C8 | 113.87 (11) | O2—C2—C15—N4 | 52.11 (12) |
C1—C2—C3—C8 | −4.77 (12) | C3—C2—C15—N4 | 178.14 (9) |
C8—C3—C4—C5 | 0.01 (18) | C1—C2—C15—N4 | −69.27 (13) |
C2—C3—C4—C5 | −178.97 (12) | O2—C2—C15—C16 | 166.73 (9) |
C3—C4—C5—C6 | −0.60 (19) | C3—C2—C15—C16 | −67.24 (13) |
C4—C5—C6—C7 | 0.32 (19) | C1—C2—C15—C16 | 45.36 (13) |
C5—C6—C7—C8 | 0.56 (18) | C17—N2—C16—O3 | 178.51 (12) |
C6—C7—C8—C3 | −1.17 (18) | C17—N2—C16—C15 | −1.87 (13) |
C6—C7—C8—N1 | 176.39 (11) | N4—C15—C16—O3 | 177.90 (11) |
C4—C3—C8—C7 | 0.91 (19) | C2—C15—C16—O3 | 55.19 (15) |
C2—C3—C8—C7 | −179.91 (11) | N4—C15—C16—N2 | −1.74 (12) |
C4—C3—C8—N1 | −177.05 (11) | C2—C15—C16—N2 | −124.45 (11) |
C2—C3—C8—N1 | 2.13 (14) | C15—N4—C17—N3 | 172.92 (11) |
C1—N1—C8—C7 | −175.84 (12) | C18—N4—C17—N3 | 22.09 (18) |
C9—N1—C8—C7 | −6.55 (19) | C15—N4—C17—N2 | −6.58 (13) |
C1—N1—C8—C3 | 1.96 (14) | C18—N4—C17—N2 | −157.41 (11) |
C9—N1—C8—C3 | 171.25 (11) | C16—N2—C17—N3 | −174.16 (11) |
C1—N1—C9—C14 | −123.26 (13) | C16—N2—C17—N4 | 5.35 (14) |
C8—N1—C9—C14 | 68.92 (15) |
D—H···A | D—H | H···A | D···A | D—H···A |
O2—H2···O1S | 0.84 | 2.19 | 2.9579 (14) | 152 |
O2—H2···O3i | 0.84 | 2.58 | 3.2440 (12) | 137 |
N3—H3A···O1ii | 0.88 | 2.02 | 2.8898 (13) | 169 |
N3—H3B···N2iii | 0.88 | 2.06 | 2.9391 (15) | 174 |
O1S—H1S···O3i | 0.84 | 1.89 | 2.7048 (13) | 162 |
Symmetry codes: (i) x+1, y, z; (ii) −x+1, −y, −z; (iii) −x, −y, −z. |
Experimental details
Crystal data | |
Chemical formula | C18H16N4O3·C2H6O |
Mr | 382.42 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 90 |
a, b, c (Å) | 7.4912 (1), 11.0018 (2), 12.0835 (2) |
α, β, γ (°) | 78.152 (1), 74.413 (1), 74.090 (1) |
V (Å3) | 913.15 (3) |
Z | 2 |
Radiation type | Cu Kα |
µ (mm−1) | 0.82 |
Crystal size (mm) | 0.11 × 0.11 × 0.08 |
Data collection | |
Diffractometer | Bruker X8 Proteum diffractometer |
Absorption correction | Multi-scan (SADABS in APEX2; Bruker, 2006) |
Tmin, Tmax | 0.828, 0.938 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 13576, 3294, 3126 |
Rint | 0.035 |
(sin θ/λ)max (Å−1) | 0.602 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.037, 0.098, 1.07 |
No. of reflections | 3294 |
No. of parameters | 258 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.37, −0.41 |
Computer programs: APEX2 (Bruker, 2006), SAINT (Bruker, 2006), SHELXS97 (Sheldrick, 2008), XP in SHELXTL (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008) and local procedures.
D—H···A | D—H | H···A | D···A | D—H···A |
O2—H2···O1S | 0.84 | 2.19 | 2.9579 (14) | 152.0 |
O2—H2···O3i | 0.84 | 2.58 | 3.2440 (12) | 136.6 |
N3—H3A···O1ii | 0.88 | 2.02 | 2.8898 (13) | 169.3 |
N3—H3B···N2iii | 0.88 | 2.06 | 2.9391 (15) | 173.5 |
O1S—H1S···O3i | 0.84 | 1.89 | 2.7048 (13) | 162.3 |
Symmetry codes: (i) x+1, y, z; (ii) −x+1, −y, −z; (iii) −x, −y, −z. |
Acknowledgements
This investigation was supported by NIH/National Cancer Institute grant PO1 CA104457 (PAC) and by NSF MRI grant CHE 0319176 (SP).
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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.
1H-Indole-2,3-diones (isatins) are versatile molecules that display diverse biological activities, (Pandeya et al., 2005), including anticancer activity. (Cane et al., 2000 and Vine et al., 2007). Based on the results of earlier work on radiosensitizers such as (Z)-2-(N-benzylindol-3-ylmethylene)quinuclidin-3-one and (Z)-(±)-2-(N-benzylindol-3-ylmethylene) quinuclidin-3-ol derivatives (Sekhar et al., 2003; Sonar et al., 2007), we have carried out the design, synthesis and structural analysis of a series of 3-(2-amino-1-methyl-4-oxo-4,5-dihydro-1H-imidazol-5-yl)-3- hydroxyindolin-2-one analogs with different substituents on the indole moiety. This X-ray analysis of the title compound was performed to confirm the stereochemistry of the molecule and to obtain detailed information on the conformation of the molecule, which may be useful in structure-activity relationship (SAR) analysis. The title compound was prepared by the aldol condensation of N-phenylindol-2,3-dione (N -phenyl isatin) with 2-amino- 1-methyl-1H-imidazol-4(5H)-one (creatinine) in the presence of sodium acetate in acetic acid under microwave irradiation. The compound was crystallized from ethyl alcohol. This aldol condensation reaction proceeds by the formation of the E-enolate, as per the Zimmerman-Traxler model (Zimmerman & Traxler, 1957), which favores anti products, and leads to the formation of a racemic compound (equimolar RR and SS enantiomers). The molecular structure and the atom-numbering scheme are shown in Fig.1. The isatin ring is planar (r.m.s. deviation = 0.00342 (10) Å) with bond distances and angles comparable with those previously reported for other isatin derivatives (Frolova et al., 1988; Usman, et al., 2002 and Penthala et al. 2009). The indole and creatinine moieties make a dihedral angle of 56.45 (4)°. Intermolecular N—H···O and O—H···N hydrogen bonds stabilize the crystal structure and form a supramolecular aggregation.