Literature DB >> 25553001

Crystal structure of dimethyl 3,3'-[(3-fluoro-phenyl)methyl-ene]bis-(1H-indole-2-carboxyl-ate).

Xin-Hua Lu1, Hong-Shun Sun2, Jin Hu1.   

Abstract

In the title compound, C27H21FN2O4, the mean planes of the two indole ring systems (r.m.s. deviations = 0.0166 and 0.0086 Å) are approximately perpendic-ular to one another, making a dihedral angle of 87.8 (5)°; the fluorobenzene ring is twisted with respect to the mean planes of the two indole ring systems at 82.7 (5) and 85.5 (3)°. In the crystal, pairs of N-H⋯O hydrogen bonds link the mol-ecules into the inversion dimers, which are further linked by N-H⋯O hydrogen bonds into supra-molecular chains propagating along the b-axis direction. Weak C-H⋯π inter-actions are observed between neighbouring chains.

Entities:  

Keywords:  C—H⋯π inter­actions; MRI contrast agent; N—H⋯O hydrogen bonds; crystal structure; indole

Year:  2014        PMID: 25553001      PMCID: PMC4257463          DOI: 10.1107/S1600536814025756

Source DB:  PubMed          Journal:  Acta Crystallogr Sect E Struct Rep Online        ISSN: 1600-5368


Chemical context

The indole unit forms the basis for general bis­(indoly)methanes, which are widely present in bioactive metabolites of numerous compounds isolated from natural sources (Poter et al., 1977 ▶; Sundberg, 1996 ▶). In addition, bis­(indoly)methanes are important anti­biotics in the field of pharmaceuticals and the precursor of bioactive metabolites of terrestrial and marine origin (Chang et al., 1999 ▶; Ge et al., 1999 ▶). The title compound is one of the bis­(indoly)methane derivatives used as a precursor for MRI contrast agents (Ni, 2008 ▶). In recent years, we have reported the synthesis and crystal structures of some similar compounds (Sun et al., 2012 ▶, 2013 ▶, 2014 ▶; Li et al., 2014 ▶). Now we report herein on another bis­(indoly)methane compound.

Structural commentary

The mol­ecular structure of the title compound is shown in Fig. 1 ▶. The two indole ring systems are nearly perpendicular to each other [dihedral angle = 87.8 (5)°] while the benzene ring (C22–C27) is twisted to the N1/C2–C9 and N2/C12–C19 indole ring systems by dihedral angles of 82.7 (5) and 85.5 (3)°, respectively. The carboxyl groups are approximately co-planar with the attached indole ring systems, the dihedral angles between the carboxyl groups and the mean planes of the attached indole ring systems being 9.6 (3) and 9.6 (4)°.
Figure 1

The mol­ecular structure of the title mol­ecule with the atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level.

Supra­molecular features

In the crystal, pairs of N1—H1A⋯O3i [symmetry code: (i) −x, 1 − y, −z] hydrogen bonds link the mol­ecules into inversion dimmers, which are further linked by N2—H2A⋯O2ii [symmetry code: (ii) x, 1 + y, z] hydrogen bonds into supra­molecular chains propagating along the b-axis direction (Table 1 ▶ and Fig. 2 ▶). Weak C—H⋯π inter­actions are also observed between neighbouring chains (Table 1 ▶).
Table 1

Hydrogen-bond geometry (, )

Cg4 is the centroid of the C13C18 ring.

DHA DHHA D A DHA
N1H1AO3i 0.862.062.913(3)170
N2H2AO2ii 0.862.152.948(3)155
C6H6A Cg4iii 0.932.753.645(4)162

Symmetry codes: (i) ; (ii) ; (iii) .

Figure 2

A packing diagram of the title compound. Hydrogen bonds are shown as dashed lines.

Database survey

Several similar structures have been reported previously, viz. diethyl 3,3′-(phenyl­methyl­ene)bis­(1H-indole-2-carboxyl­ate) (Sun et al., 2012 ▶), dimethyl 3,3′-(phenyl­methyl­ene)bis­(1H-indole-2-carboxyl­ate) (Sun et al., 2013 ▶), dimethyl 3,3′-[(4-chloro­phen­yl) methyl­ene]bis­(1H-indole-2-carboxyl­ate) (Li et al., 2014 ▶) and dimethyl 3,3′-[(3-nitro­phen­yl)methyl­ene]bis­(1H-indole-2-carboxyl­ate) ethanol monosolvate (Sun et al., 2014 ▶). In those structures, the two indole ring systems are also nearly perpendicular to each other, the dihedral angles being 82.0 (5), 84.5 (5), 79.5 (4) and 89.3 (5)°, respectively.

Synthesis and crystallization

Methyl indole-2-carboxyl­ate (17.5 g, 100 mmol) was dissolved in 200 ml methanol; commercially available 3-fluoro­benz­aldehyde (6.2 g, 50 mmol) was added and the mixture was heated to reflux temperature. Concentrated HCl (3.7 ml) was added and the reaction was left for 1 h. After cooling, the white product was filtered off and washed thoroughly with methanol. The reaction was monitored by TLC (CHCl3:hexane = 1:1). The yield was 92%. Single crystals of the title compound suitable for X-ray analysis were obtained by slow evaporation of a methanol solution.

Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2 ▶. H atoms were positioned geometrically with N—H = 0.86 and C—H = 0.93–0.98 Å, and constrained to ride on their parent atoms, with U iso(H) = xU eq(C,N), where x = 1.5 for methyl H atoms and 1.2 for the others.
Table 2

Experimental details

Crystal data
Chemical formulaC27H21FN2O4
M r 456.46
Crystal system, space groupTriclinic, P
Temperature (K)293
a, b, c ()9.6980(19), 10.119(2), 12.875(3)
, , ()89.86(3), 83.10(3), 65.45(3)
V (3)1139.4(4)
Z 2
Radiation typeMo K
(mm1)0.10
Crystal size (mm)0.30 0.20 0.10
 
Data collection
DiffractometerEnrafNonius CAD-4
Absorption correction scan (North et al., 1968)
T min, T max 0.972, 0.991
No. of measured, independent and observed [I > 2(I)] reflections4453, 4183, 2587
R int 0.036
(sin /)max (1)0.603
 
Refinement
R[F 2 > 2(F 2)], wR(F 2), S 0.060, 0.163, 1.00
No. of reflections4183
No. of parameters307
No. of restraints1
H-atom treatmentH-atom parameters constrained
max, min (e 3)0.72, 0.25

Computer programs: CAD-4 EXPRESS (EnrafNonius, 1994 ▶), XCAD4 (Harms Wocadlo, 1995 ▶) and SHELXTL (Sheldrick, 2008 ▶).

Crystal structure: contains datablock(s) I, global. DOI: 10.1107/S1600536814025756/xu5830sup1.cif Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536814025756/xu5830Isup2.hkl Click here for additional data file. Supporting information file. DOI: 10.1107/S1600536814025756/xu5830Isup3.cml CCDC reference: 1036100 Additional supporting information: crystallographic information; 3D view; checkCIF report
C27H21FN2O4Z = 2
Mr = 456.46F(000) = 476
Triclinic, P1Dx = 1.331 Mg m3
Hall symbol: -P 1Mo Kα radiation, λ = 0.71073 Å
a = 9.6980 (19) ÅCell parameters from 25 reflections
b = 10.119 (2) Åθ = 9–13°
c = 12.875 (3) ŵ = 0.10 mm1
α = 89.86 (3)°T = 293 K
β = 83.10 (3)°Block, colorless
γ = 65.45 (3)°0.30 × 0.20 × 0.10 mm
V = 1139.4 (4) Å3
Enraf–Nonius CAD-4 diffractometer2587 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tubeRint = 0.036
Graphite monochromatorθmax = 25.4°, θmin = 1.6°
ω/2θ scansh = 0→11
Absorption correction: ψ scan (North et al., 1968)k = −11→12
Tmin = 0.972, Tmax = 0.991l = −15→15
4453 measured reflections3 standard reflections every 200 reflections
4183 independent reflections intensity decay: 1%
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.060Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.163H-atom parameters constrained
S = 1.00w = 1/[σ2(Fo2) + (0.085P)2] where P = (Fo2 + 2Fc2)/3
4183 reflections(Δ/σ)max < 0.001
307 parametersΔρmax = 0.72 e Å3
1 restraintΔρmin = −0.25 e Å3
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 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 > σ(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.
xyzUiso*/Ueq
N1−0.1052 (3)0.5029 (2)0.13830 (18)0.0445 (6)
H1A−0.14080.44960.10900.053*
O10.3009 (2)0.3113 (2)0.08820 (18)0.0586 (6)
C10.2144 (3)0.5855 (3)0.2059 (2)0.0334 (6)
H1B0.28590.53290.14410.040*
O20.1188 (3)0.2409 (2)0.05471 (17)0.0555 (6)
N20.1837 (3)0.9546 (2)0.14191 (17)0.0396 (6)
H2A0.17671.02110.09850.048*
C20.0646 (3)0.5803 (3)0.1908 (2)0.0341 (6)
O30.2455 (2)0.6468 (2)−0.02476 (15)0.0486 (5)
C3−0.0884 (3)0.6830 (3)0.2299 (2)0.0359 (6)
O40.1821 (3)0.8813 (2)−0.05567 (15)0.0529 (6)
C4−0.1512 (3)0.8120 (3)0.2943 (2)0.0439 (7)
H4A−0.08800.84850.32070.053*
F0.6593 (3)0.3395 (3)0.38335 (19)0.1028 (8)
C5−0.3065 (4)0.8827 (3)0.3173 (2)0.0522 (8)
H5B−0.34830.96760.36010.063*
C6−0.4039 (4)0.8314 (3)0.2787 (3)0.0545 (8)
H6A−0.50900.88410.29510.065*
C7−0.3497 (4)0.7059 (3)0.2175 (3)0.0518 (8)
H7A−0.41540.67150.19240.062*
C8−0.1906 (3)0.6313 (3)0.1940 (2)0.0394 (7)
C90.0469 (3)0.4723 (3)0.1365 (2)0.0368 (6)
C100.1559 (4)0.3315 (3)0.0883 (2)0.0416 (7)
C110.4154 (4)0.1713 (4)0.0498 (3)0.0767 (11)
H11A0.51490.16860.05290.115*
H11B0.40490.1537−0.02150.115*
H11C0.40310.09770.09210.115*
C120.2062 (3)0.7399 (3)0.2047 (2)0.0312 (6)
C130.1975 (3)0.8347 (3)0.2903 (2)0.0331 (6)
C140.2017 (3)0.8230 (3)0.3985 (2)0.0416 (7)
H14A0.21200.73680.42950.050*
C150.1906 (4)0.9398 (3)0.4581 (2)0.0517 (8)
H15A0.19490.93170.52970.062*
C160.1728 (4)1.0709 (3)0.4134 (3)0.0547 (9)
H16A0.16321.14880.45630.066*
C170.1692 (4)1.0876 (3)0.3093 (2)0.0489 (8)
H17A0.15861.17480.27990.059*
C180.1821 (3)0.9681 (3)0.2474 (2)0.0373 (7)
C190.1986 (3)0.8161 (3)0.1163 (2)0.0339 (6)
C200.2100 (3)0.7701 (3)0.0063 (2)0.0376 (7)
C210.1995 (4)0.8471 (4)−0.1662 (2)0.0666 (10)
H21A0.17700.9343−0.20360.100*
H21B0.13030.8053−0.17970.100*
H21C0.30270.7788−0.18910.100*
C220.2846 (3)0.5040 (3)0.2992 (2)0.0367 (7)
C230.4402 (3)0.4571 (3)0.3005 (2)0.0449 (7)
H23A0.50000.47460.24490.054*
C240.5055 (4)0.3846 (4)0.3845 (3)0.0548 (8)
C250.4234 (4)0.3559 (4)0.4673 (3)0.0629 (10)
H25A0.47060.30620.52320.076*
C260.2694 (4)0.4020 (4)0.4664 (3)0.0639 (10)
H26A0.21050.38440.52260.077*
C270.2007 (4)0.4745 (3)0.3822 (2)0.0491 (8)
H27A0.09630.50360.38200.059*
U11U22U33U12U13U23
N10.0524 (17)0.0385 (13)0.0546 (15)−0.0295 (12)−0.0120 (12)−0.0062 (11)
O10.0498 (14)0.0351 (11)0.0876 (17)−0.0160 (10)−0.0029 (12)−0.0176 (11)
C10.0389 (16)0.0255 (13)0.0378 (15)−0.0145 (12)−0.0079 (12)−0.0016 (11)
O20.0730 (16)0.0339 (11)0.0677 (14)−0.0277 (11)−0.0187 (12)−0.0071 (10)
N20.0548 (16)0.0283 (11)0.0403 (14)−0.0212 (11)−0.0092 (11)0.0015 (10)
C20.0378 (16)0.0297 (13)0.0389 (15)−0.0173 (12)−0.0088 (12)−0.0001 (11)
O30.0655 (15)0.0392 (11)0.0468 (12)−0.0257 (10)−0.0143 (10)−0.0053 (9)
C30.0392 (16)0.0349 (14)0.0392 (15)−0.0200 (13)−0.0086 (12)0.0029 (12)
O40.0744 (16)0.0425 (11)0.0401 (12)−0.0228 (11)−0.0075 (10)0.0044 (9)
C40.0446 (19)0.0390 (16)0.0507 (18)−0.0197 (14)−0.0065 (14)−0.0108 (14)
F0.0659 (15)0.131 (2)0.0963 (18)−0.0211 (15)−0.0317 (13)0.0148 (15)
C50.0440 (19)0.0439 (17)0.063 (2)−0.0142 (15)0.0002 (15)−0.0118 (15)
C60.0383 (19)0.055 (2)0.067 (2)−0.0171 (16)−0.0064 (16)0.0020 (17)
C70.0432 (19)0.0553 (19)0.067 (2)−0.0292 (16)−0.0115 (16)0.0039 (16)
C80.0422 (17)0.0407 (16)0.0422 (16)−0.0233 (14)−0.0094 (13)0.0029 (13)
C90.0433 (17)0.0332 (14)0.0400 (16)−0.0205 (13)−0.0111 (13)0.0015 (12)
C100.057 (2)0.0320 (14)0.0411 (16)−0.0232 (14)−0.0096 (14)0.0026 (12)
C110.058 (2)0.047 (2)0.108 (3)−0.0091 (18)0.003 (2)−0.020 (2)
C120.0289 (14)0.0286 (13)0.0399 (15)−0.0149 (11)−0.0085 (12)−0.0012 (11)
C130.0305 (15)0.0307 (14)0.0413 (16)−0.0156 (12)−0.0066 (12)−0.0027 (12)
C140.0461 (18)0.0370 (15)0.0437 (17)−0.0187 (14)−0.0076 (13)0.0002 (13)
C150.064 (2)0.0522 (19)0.0421 (17)−0.0270 (17)−0.0089 (15)−0.0080 (15)
C160.067 (2)0.0413 (17)0.055 (2)−0.0216 (16)−0.0093 (16)−0.0156 (15)
C170.056 (2)0.0346 (15)0.058 (2)−0.0204 (15)−0.0095 (15)−0.0068 (14)
C180.0351 (16)0.0317 (14)0.0451 (17)−0.0133 (12)−0.0080 (13)−0.0043 (12)
C190.0376 (16)0.0297 (13)0.0384 (15)−0.0174 (12)−0.0070 (12)−0.0028 (12)
C200.0383 (17)0.0363 (15)0.0414 (16)−0.0180 (13)−0.0078 (13)−0.0015 (13)
C210.088 (3)0.069 (2)0.0409 (19)−0.031 (2)−0.0089 (18)0.0063 (16)
C220.0415 (17)0.0274 (13)0.0429 (16)−0.0155 (12)−0.0075 (13)−0.0046 (12)
C230.0471 (19)0.0438 (16)0.0451 (18)−0.0196 (14)−0.0083 (14)0.0030 (14)
C240.0472 (19)0.0567 (19)0.054 (2)−0.0121 (16)−0.0195 (16)0.0022 (16)
C250.078 (3)0.062 (2)0.048 (2)−0.023 (2)−0.0242 (19)0.0152 (16)
C260.075 (3)0.072 (2)0.052 (2)−0.037 (2)−0.0126 (18)0.0107 (18)
C270.0469 (19)0.0564 (19)0.0498 (19)−0.0263 (16)−0.0105 (15)0.0107 (15)
N1—C81.362 (3)C11—H11A0.9600
N1—C91.373 (4)C11—H11B0.9600
N1—H1A0.8600C11—H11C0.9600
O1—C101.333 (4)C12—C191.365 (4)
O1—C111.431 (4)C12—C131.435 (3)
C1—C21.511 (4)C13—C141.402 (4)
C1—C221.520 (4)C13—C181.413 (4)
C1—C121.532 (3)C14—C151.370 (4)
C1—H1B0.9800C14—H14A0.9300
O2—C101.213 (3)C15—C161.396 (4)
N2—C181.363 (3)C15—H15A0.9300
N2—C191.385 (3)C16—C171.353 (4)
N2—H2A0.8600C16—H16A0.9300
C2—C91.379 (3)C17—C181.403 (4)
C2—C31.440 (4)C17—H17A0.9300
O3—C201.203 (3)C19—C201.469 (4)
C3—C41.409 (4)C21—H21A0.9600
C3—C81.419 (4)C21—H21B0.9600
O4—C201.330 (3)C21—H21C0.9600
O4—C211.439 (3)C22—C271.373 (4)
C4—C51.366 (4)C22—C231.383 (4)
C4—H4A0.9300C23—C241.372 (4)
F—C241.364 (4)C23—H23A0.9300
C5—C61.389 (4)C24—C251.357 (5)
C5—H5B0.9300C25—C261.370 (5)
C6—C71.364 (4)C25—H25A0.9300
C6—H6A0.9300C26—C271.385 (4)
C7—C81.401 (4)C26—H26A0.9300
C7—H7A0.9300C27—H27A0.9300
C9—C101.458 (4)
C8—N1—C9109.0 (2)C13—C12—C1129.4 (2)
C8—N1—H1A125.5C14—C13—C18118.0 (2)
C9—N1—H1A125.5C14—C13—C12135.4 (2)
C10—O1—C11116.3 (2)C18—C13—C12106.6 (2)
C2—C1—C22113.7 (2)C15—C14—C13119.3 (3)
C2—C1—C12112.9 (2)C15—C14—H14A120.4
C22—C1—C12112.7 (2)C13—C14—H14A120.4
C2—C1—H1B105.5C14—C15—C16121.3 (3)
C22—C1—H1B105.5C14—C15—H15A119.4
C12—C1—H1B105.5C16—C15—H15A119.4
C18—N2—C19108.7 (2)C17—C16—C15121.8 (3)
C18—N2—H2A125.7C17—C16—H16A119.1
C19—N2—H2A125.7C15—C16—H16A119.1
C9—C2—C3105.3 (2)C16—C17—C18117.3 (3)
C9—C2—C1126.3 (2)C16—C17—H17A121.3
C3—C2—C1128.5 (2)C18—C17—H17A121.3
C4—C3—C8117.9 (3)N2—C18—C17129.5 (3)
C4—C3—C2134.8 (3)N2—C18—C13108.2 (2)
C8—C3—C2107.3 (2)C17—C18—C13122.3 (3)
C20—O4—C21116.2 (2)C12—C19—N2109.8 (2)
C5—C4—C3118.9 (3)C12—C19—C20130.1 (2)
C5—C4—H4A120.6N2—C19—C20120.1 (2)
C3—C4—H4A120.6O3—C20—O4124.0 (2)
C4—C5—C6121.9 (3)O3—C20—C19124.5 (3)
C4—C5—H5B119.0O4—C20—C19111.4 (2)
C6—C5—H5B119.0O4—C21—H21A109.5
C7—C6—C5121.8 (3)O4—C21—H21B109.5
C7—C6—H6A119.1H21A—C21—H21B109.5
C5—C6—H6A119.1O4—C21—H21C109.5
C6—C7—C8117.0 (3)H21A—C21—H21C109.5
C6—C7—H7A121.5H21B—C21—H21C109.5
C8—C7—H7A121.5C27—C22—C23118.4 (3)
N1—C8—C7129.8 (3)C27—C22—C1123.0 (3)
N1—C8—C3107.7 (2)C23—C22—C1118.5 (3)
C7—C8—C3122.5 (3)C24—C23—C22119.4 (3)
N1—C9—C2110.7 (2)C24—C23—H23A120.3
N1—C9—C10116.5 (2)C22—C23—H23A120.3
C2—C9—C10132.5 (3)C25—C24—F119.4 (3)
O2—C10—O1123.6 (3)C25—C24—C23122.6 (3)
O2—C10—C9123.6 (3)F—C24—C23118.0 (3)
O1—C10—C9112.8 (2)C24—C25—C26118.2 (3)
O1—C11—H11A109.5C24—C25—H25A120.9
O1—C11—H11B109.5C26—C25—H25A120.9
H11A—C11—H11B109.5C25—C26—C27120.4 (3)
O1—C11—H11C109.5C25—C26—H26A119.8
H11A—C11—H11C109.5C27—C26—H26A119.8
H11B—C11—H11C109.5C22—C27—C26121.0 (3)
C19—C12—C13106.8 (2)C22—C27—H27A119.5
C19—C12—C1123.7 (2)C26—C27—H27A119.5
C22—C1—C2—C9−86.0 (3)C1—C12—C13—C18−176.2 (3)
C12—C1—C2—C9143.9 (3)C18—C13—C14—C150.1 (4)
C22—C1—C2—C393.1 (3)C12—C13—C14—C15179.7 (3)
C12—C1—C2—C3−37.0 (4)C13—C14—C15—C161.0 (5)
C9—C2—C3—C4176.4 (3)C14—C15—C16—C17−1.5 (5)
C1—C2—C3—C4−2.8 (5)C15—C16—C17—C180.8 (5)
C9—C2—C3—C8−1.3 (3)C19—N2—C18—C17180.0 (3)
C1—C2—C3—C8179.4 (2)C19—N2—C18—C130.5 (3)
C8—C3—C4—C5−1.4 (4)C16—C17—C18—N2−179.1 (3)
C2—C3—C4—C5−178.9 (3)C16—C17—C18—C130.3 (4)
C3—C4—C5—C6−0.3 (5)C14—C13—C18—N2178.7 (2)
C4—C5—C6—C71.4 (5)C12—C13—C18—N2−0.9 (3)
C5—C6—C7—C8−0.7 (5)C14—C13—C18—C17−0.8 (4)
C9—N1—C8—C7−179.6 (3)C12—C13—C18—C17179.6 (3)
C9—N1—C8—C3−0.7 (3)C13—C12—C19—N2−0.7 (3)
C6—C7—C8—N1177.7 (3)C1—C12—C19—N2176.7 (2)
C6—C7—C8—C3−1.1 (4)C13—C12—C19—C20176.5 (3)
C4—C3—C8—N1−176.9 (2)C1—C12—C19—C20−6.1 (4)
C2—C3—C8—N11.3 (3)C18—N2—C19—C120.1 (3)
C4—C3—C8—C72.1 (4)C18—N2—C19—C20−177.4 (2)
C2—C3—C8—C7−179.7 (3)C21—O4—C20—O3−1.2 (4)
C8—N1—C9—C2−0.2 (3)C21—O4—C20—C19176.3 (3)
C8—N1—C9—C10174.5 (2)C12—C19—C20—O3−8.5 (5)
C3—C2—C9—N10.9 (3)N2—C19—C20—O3168.5 (3)
C1—C2—C9—N1−179.8 (2)C12—C19—C20—O4174.0 (3)
C3—C2—C9—C10−172.5 (3)N2—C19—C20—O4−9.0 (4)
C1—C2—C9—C106.7 (5)C2—C1—C22—C27−22.3 (4)
C11—O1—C10—O2−2.7 (4)C12—C1—C22—C27107.9 (3)
C11—O1—C10—C9175.3 (3)C2—C1—C22—C23157.6 (2)
N1—C9—C10—O2−3.0 (4)C12—C1—C22—C23−72.3 (3)
C2—C9—C10—O2170.1 (3)C27—C22—C23—C24−0.8 (4)
N1—C9—C10—O1179.0 (2)C1—C22—C23—C24179.4 (2)
C2—C9—C10—O1−7.9 (4)C22—C23—C24—C250.3 (5)
C2—C1—C12—C19−72.7 (3)C22—C23—C24—F179.9 (3)
C22—C1—C12—C19156.8 (2)F—C24—C25—C26−179.8 (3)
C2—C1—C12—C13104.0 (3)C23—C24—C25—C26−0.2 (5)
C22—C1—C12—C13−26.5 (4)C24—C25—C26—C270.7 (5)
C19—C12—C13—C14−178.6 (3)C23—C22—C27—C261.2 (4)
C1—C12—C13—C144.3 (5)C1—C22—C27—C26−178.9 (3)
C19—C12—C13—C181.0 (3)C25—C26—C27—C22−1.2 (5)
D—H···AD—HH···AD···AD—H···A
N1—H1A···O3i0.862.062.913 (3)170
N2—H2A···O2ii0.862.152.948 (3)155
C6—H6A···Cg4iii0.932.753.645 (4)162
  8 in total

1.  Induction of apoptosis in MCF-7 cells by indole-3-carbinol is independent of p53 and bax.

Authors:  X Ge; F A Fares; S Yannai
Journal:  Anticancer Res       Date:  1999 Jul-Aug       Impact factor: 2.480

2.  Indole alkaloids from Balansia epichloë (Weese).

Authors:  J K Porter; C W Bacon; J D Robbins; D S Himmelsbach; H C Higman
Journal:  J Agric Food Chem       Date:  1976 Jan-Feb       Impact factor: 5.279

3.  A short history of SHELX.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr A       Date:  2007-12-21       Impact factor: 2.290

4.  Cytostatic and antiestrogenic effects of 2-(indol-3-ylmethyl)-3,3'-diindolylmethane, a major in vivo product of dietary indole-3-carbinol.

Authors:  Y C Chang; J Riby; G H Chang; B C Peng; G Firestone; L F Bjeldanes
Journal:  Biochem Pharmacol       Date:  1999-09-01       Impact factor: 5.858

5.  Diethyl 3,3'-(phenyl-methyl-ene)bis-(1H-indole-2-carboxyl-ate).

Authors:  Hong-Shun Sun; Yu-Long Li; Ning Xu; Hong Xu; Ji-Dong Zhang
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2012-08-25

6.  Dimethyl 3,3'-(phenyl-methyl-ene)bis-(1H-indole-2-carboxyl-ate).

Authors:  Hong-Shun Sun; Yu-Long Li; Ning Xu; Hong Xu; Ji-Dong Zhang
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2013-09-07

7.  Crystal structure of dimethyl 3,3'-[(4-chloro-phen-yl)methyl-ene]bis-(1H-indole-2-carboxyl-ate).

Authors:  Yu-Long Li; Hong-Shun Sun; Hong Jiang; Ning Xu; Hong Xu
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2014-09-27

8.  Crystal structure of dimethyl 3,3'-[(3-nitro-phen-yl)methyl-ene]bis-(1H-indole-2-carboxyl-ate) ethanol monosolvate.

Authors:  Hong-Shun Sun; Yu-Long Li; Hong Jiang; Ning Xu; Hong Xu
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2014-10-24
  8 in total
  4 in total

1.  Crystal structure of diethyl 3,3'-[(4-nitro-phen-yl)methyl-ene]bis-(1H-indole-2-carboxyl-ate).

Authors:  Hong-Shun Sun; Yu-Long Li; Hong Jiang; Yu-Liang Chen; Ya-Di Hu
Journal:  Acta Crystallogr E Crystallogr Commun       Date:  2017-11-28

2.  Crystal structure of diethyl 3,3'-[(2,4-di-chloro-phen-yl)methyl-idene]bis-(1H-indole-2-carboxyl-ate).

Authors:  Yu-Long Li; Hong-Shun Sun; Hong Jiang; Yu-Liang Chen; Yang-Feng Chen
Journal:  Acta Crystallogr E Crystallogr Commun       Date:  2017-11-03

3.  Crystal structure of dimethyl 3,3'-[(4-fluoro-phen-yl)methyl-ene]bis-(1H-indole-2-carboxyl-ate).

Authors:  Hong-Shun Sun; Yu-Long Li; Hong Jiang; Ning Xu; Hong Xu
Journal:  Acta Crystallogr E Crystallogr Commun       Date:  2015-09-12

4.  Crystal structure of diethyl 3,3'-[(2-fluoro-phen-yl)methyl-idene]bis-(1H-indole-2-carboxyl-ate).

Authors:  Xin-Hua Lu; Hong-Shun Sun; Yuan Cai; Lu-Lu Chen; Yang-Feng Chen
Journal:  Acta Crystallogr E Crystallogr Commun       Date:  2017-10-31
  4 in total

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