organic compounds
Phenyl(pyrrolo[2,1-a]isoquinolin-3-yl)methanone
aInstitute of Chemistry and Chemical Engineering, Xuzhou Normal University, Xuzhou 221116, People's Republic of China, and bKey Laboratory of Biotechnology for Medical Plants of Jiangsu Province, Xuzhou Normal University, Xuzhou, Jiangsu 221116, People's Republic of China
*Correspondence e-mail: liu_yun3@sina.com.cn
In the title compound, C19H13NO, the fused isoquinoline–pyrrole system is planar (r.m.s. deviation = 0.0249] Å) and makes a dihedral angle of 53.73 (9)° with the phenyl ring. An intramolecular C—H⋯O interaction generates an S(6) ring motif.
Related literature
For the biological activity of indolizine, see: Olden et al. (1991); Jaffrezou et al. (1992). For our work on the direct one-pot syntheses of pyrrolo[2,1-a]isoquinolines, see: Liu et al. (2010). For the preparation of pyrrolo[2,1-a]isoquinoline, see: Verna et al. (2009). For bond-length data, see: Allen et al. (1987).
Experimental
Crystal data
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Refinement
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Data collection: CAD-4 Software (Enraf–Nonius, 1989); cell CAD-4 Software; data reduction: XCAD4 (Harms & Wocadlo, 1995); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009).
Supporting information
https://doi.org/10.1107/S1600536810017101/ds2027sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810017101/ds2027Isup2.hkl
The compound (I) was prepared by the reaction of DMF solution of 2-(2-oxo-2- phenylethyl)isoquinolinium bromide with an excess amount of maleic acid in the presence of TPCD and potassium carbonate. After the reaction was completed, the mixture was isolated by
on a silica gel column after evaporation of the solvent. Single crystals of (I) were obtained by slow evaporation from an petroleum ether-ethyl acetate(3:1) solvent system (yield 80%).The natural and many synthetic indolizines have a diversity of biological activity and are playing an increasingly important role in developing new pharmaceuticals [Olden et al., 1991; Jaffrezou et al., 1992]. Pyrrolo[2,1-a]- isoquinolines are 7,8- benzo- fused indolizines and occur in several marine
The synthesis of these structures is drawing much recent research interest [Verna et al., 2009]. In our research work on the direct one pot syntheses of pyrrolo[2,1-a]isoquinolines [Liu et al., 2010], we have prepared the title compound, (I), as one of the products. As part of this study, we have undertaken an X-ray crystallographic analysis of (I) in order to confirm its structure. The bond lengths and angles of the title molecule (Fig. 1) are within normal ranges (Allen et al., 1987). he fused isoquinoline-pyrrole moiety is planar. The dihedral angle between the isoquinoline-pyrrole fused ring and benzene ring is 53.73 (9)°. Although atoms C8, C11 and C19 attached to atom N are all of sp2 their different environments cause slight differences in the N—C8, N—C11 and N—C19 bond lengths, and in the C19— N—C11, C19— N—C8 , C11—N—C8 and C10—C11—N angles (Table 1). An intramolecular C—H···O weak hydrogen bond generating an S(6) ring is observed (Table 2). The crystal packing is stabilized by van der Waals forces.For the biological activity of indolizine, see: Olden et al. (1991); Jaffrezou et al. (1992). For the preparation of pyrrolo[2,1-a]isoquinoline, see: Verna et al. (2009). For our work on the direct one-pot syntheses of pyrrolo[2,1-a]isoquinolines, see: Liu et al. (2010). For bond-length data, see: Allen et al. (1987);
Data collection: CAD-4 Software (Enraf–Nonius, 1989); cell
CAD-4 Software (Enraf–Nonius, 1989); data reduction: XCAD4 (Harms & Wocadlo, 1995); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).Fig. 1. The molecular structure of (I), with atom labels and 50% probability displacement ellipsoids for non-H atoms. |
C19H13NO | F(000) = 568 |
Mr = 271.30 | Dx = 1.342 Mg m−3 |
Monoclinic, P21/c | Melting point: 413 K |
Hall symbol: -P 2ybc | Mo Kα radiation, λ = 0.71073 Å |
a = 28.637 (6) Å | Cell parameters from 25 reflections |
b = 4.0400 (8) Å | θ = 9–12° |
c = 11.824 (2) Å | µ = 0.08 mm−1 |
β = 101.02 (3)° | T = 295 K |
V = 1342.7 (5) Å3 | Block, colourless |
Z = 4 | 0.30 × 0.20 × 0.10 mm |
Enraf–Nonius CAD-4 diffractometer | 1388 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.000 |
Graphite monochromator | θmax = 25.0°, θmin = 1.5° |
ω/2θ scans | h = −34→33 |
Absorption correction: ψ scan (XCAD4; Harms & Wocadlo, 1995) | k = 0→4 |
Tmin = 0.976, Tmax = 0.992 | l = 0→14 |
2351 measured reflections | 3 standard reflections every 200 reflections |
2351 independent reflections | intensity decay: none |
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)] = 0.072 | H-atom parameters constrained |
wR(F2) = 0.139 | w = 1/[σ2(Fo2) + (0.015P)2 + 2.250P] where P = (Fo2 + 2Fc2)/3 |
S = 1.00 | (Δ/σ)max < 0.001 |
2351 reflections | Δρmax = 0.23 e Å−3 |
190 parameters | Δρmin = −0.30 e Å−3 |
0 restraints | Absolute structure: (XCAD4; Harms & Wocadlo, 1995) |
Primary atom site location: structure-invariant direct methods |
C19H13NO | V = 1342.7 (5) Å3 |
Mr = 271.30 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 28.637 (6) Å | µ = 0.08 mm−1 |
b = 4.0400 (8) Å | T = 295 K |
c = 11.824 (2) Å | 0.30 × 0.20 × 0.10 mm |
β = 101.02 (3)° |
Enraf–Nonius CAD-4 diffractometer | 1388 reflections with I > 2σ(I) |
Absorption correction: ψ scan (XCAD4; Harms & Wocadlo, 1995) | Rint = 0.000 |
Tmin = 0.976, Tmax = 0.992 | 3 standard reflections every 200 reflections |
2351 measured reflections | intensity decay: none |
2351 independent reflections |
R[F2 > 2σ(F2)] = 0.072 | 0 restraints |
wR(F2) = 0.139 | H-atom parameters constrained |
S = 1.00 | Δρmax = 0.23 e Å−3 |
2351 reflections | Δρmin = −0.30 e Å−3 |
190 parameters | Absolute structure: (XCAD4; Harms & Wocadlo, 1995) |
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds 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. |
x | y | z | Uiso*/Ueq | ||
N | 0.22455 (9) | 0.5534 (7) | 0.9319 (2) | 0.0382 (7) | |
C11 | 0.19331 (11) | 0.4146 (9) | 0.9955 (3) | 0.0402 (9) | |
C7 | 0.31218 (12) | 0.5686 (10) | 0.9370 (3) | 0.0485 (10) | |
O | 0.30873 (9) | 0.6625 (9) | 0.8377 (2) | 0.0725 (10) | |
C12 | 0.14286 (12) | 0.4449 (10) | 0.9532 (3) | 0.0447 (9) | |
C3 | 0.36071 (11) | 0.5108 (10) | 1.0092 (3) | 0.0453 (9) | |
C8 | 0.27112 (11) | 0.4828 (9) | 0.9873 (3) | 0.0402 (9) | |
C19 | 0.20843 (12) | 0.7328 (10) | 0.8334 (3) | 0.0461 (9) | |
H19A | 0.2302 | 0.8309 | 0.7947 | 0.055* | |
C18 | 0.16185 (12) | 0.7680 (10) | 0.7927 (3) | 0.0513 (10) | |
H18A | 0.1517 | 0.8929 | 0.7265 | 0.062* | |
C2 | 0.37259 (12) | 0.6034 (10) | 1.1233 (3) | 0.0521 (10) | |
H2A | 0.3496 | 0.6935 | 1.1600 | 0.062* | |
C17 | 0.12699 (12) | 0.6158 (10) | 0.8496 (3) | 0.0483 (10) | |
C9 | 0.26796 (12) | 0.3050 (10) | 1.0848 (3) | 0.0458 (9) | |
H9A | 0.2936 | 0.2284 | 1.1389 | 0.055* | |
C10 | 0.22029 (12) | 0.2579 (10) | 1.0897 (3) | 0.0477 (10) | |
H10A | 0.2086 | 0.1416 | 1.1462 | 0.057* | |
C13 | 0.10950 (12) | 0.3043 (10) | 1.0117 (3) | 0.0528 (10) | |
H13A | 0.1197 | 0.1878 | 1.0798 | 0.063* | |
C14 | 0.06138 (14) | 0.3388 (13) | 0.9681 (4) | 0.0706 (14) | |
H14A | 0.0393 | 0.2498 | 1.0080 | 0.085* | |
C16 | 0.07802 (13) | 0.6403 (12) | 0.8072 (3) | 0.0628 (12) | |
H16A | 0.0672 | 0.7509 | 0.7382 | 0.075* | |
C6 | 0.45267 (14) | 0.4265 (12) | 1.1284 (4) | 0.0711 (13) | |
H6A | 0.4837 | 0.3990 | 1.1684 | 0.085* | |
C15 | 0.04577 (15) | 0.5046 (13) | 0.8655 (4) | 0.0711 (14) | |
H15A | 0.0134 | 0.5238 | 0.8361 | 0.085* | |
C4 | 0.39519 (13) | 0.3782 (11) | 0.9543 (3) | 0.0567 (11) | |
H4A | 0.3875 | 0.3207 | 0.8769 | 0.068* | |
C5 | 0.44071 (14) | 0.3323 (12) | 1.0152 (4) | 0.0684 (13) | |
H5A | 0.4635 | 0.2365 | 0.9792 | 0.082* | |
C1 | 0.41862 (13) | 0.5626 (12) | 1.1833 (3) | 0.0650 (12) | |
H1A | 0.4267 | 0.6263 | 1.2602 | 0.078* |
U11 | U22 | U33 | U12 | U13 | U23 | |
N | 0.0359 (15) | 0.0496 (19) | 0.0307 (13) | 0.0024 (15) | 0.0101 (11) | −0.0003 (15) |
C11 | 0.0396 (19) | 0.048 (2) | 0.0360 (17) | −0.0023 (18) | 0.0148 (15) | −0.0037 (18) |
C7 | 0.046 (2) | 0.064 (3) | 0.0387 (18) | 0.013 (2) | 0.0169 (16) | 0.007 (2) |
O | 0.0555 (17) | 0.117 (3) | 0.0500 (15) | 0.0072 (19) | 0.0227 (13) | 0.0212 (19) |
C12 | 0.0393 (19) | 0.050 (2) | 0.047 (2) | −0.0018 (19) | 0.0148 (16) | −0.013 (2) |
C3 | 0.0328 (18) | 0.058 (3) | 0.049 (2) | 0.0002 (19) | 0.0162 (16) | 0.007 (2) |
C8 | 0.0398 (19) | 0.050 (2) | 0.0334 (17) | 0.0048 (18) | 0.0122 (14) | 0.0029 (18) |
C19 | 0.051 (2) | 0.057 (3) | 0.0318 (17) | 0.006 (2) | 0.0117 (15) | 0.0012 (19) |
C18 | 0.049 (2) | 0.064 (3) | 0.0399 (19) | 0.017 (2) | 0.0073 (16) | 0.009 (2) |
C2 | 0.043 (2) | 0.062 (3) | 0.054 (2) | −0.002 (2) | 0.0160 (17) | 0.000 (2) |
C17 | 0.0379 (19) | 0.061 (3) | 0.046 (2) | 0.008 (2) | 0.0071 (15) | −0.010 (2) |
C9 | 0.0394 (19) | 0.060 (3) | 0.0387 (18) | 0.008 (2) | 0.0095 (15) | 0.0068 (19) |
C10 | 0.045 (2) | 0.061 (3) | 0.0396 (18) | −0.007 (2) | 0.0161 (15) | 0.006 (2) |
C13 | 0.046 (2) | 0.057 (3) | 0.059 (2) | −0.008 (2) | 0.0191 (18) | −0.010 (2) |
C14 | 0.041 (2) | 0.091 (4) | 0.085 (3) | −0.015 (3) | 0.026 (2) | −0.028 (3) |
C16 | 0.046 (2) | 0.075 (3) | 0.064 (2) | 0.012 (2) | 0.0013 (19) | −0.008 (3) |
C6 | 0.040 (2) | 0.082 (4) | 0.090 (3) | −0.004 (2) | 0.008 (2) | 0.022 (3) |
C15 | 0.042 (2) | 0.083 (4) | 0.086 (3) | 0.003 (3) | 0.007 (2) | −0.027 (3) |
C4 | 0.046 (2) | 0.064 (3) | 0.066 (2) | 0.003 (2) | 0.0244 (19) | −0.002 (2) |
C5 | 0.048 (2) | 0.068 (3) | 0.097 (3) | 0.006 (2) | 0.033 (2) | 0.005 (3) |
C1 | 0.048 (2) | 0.085 (3) | 0.060 (2) | −0.012 (3) | 0.0059 (19) | 0.003 (3) |
N—C19 | 1.374 (4) | C17—C16 | 1.399 (5) |
N—C11 | 1.392 (4) | C9—C10 | 1.390 (4) |
N—C8 | 1.399 (4) | C9—H9A | 0.9300 |
C11—C10 | 1.382 (5) | C10—H10A | 0.9300 |
C11—C12 | 1.441 (4) | C13—C14 | 1.383 (5) |
C7—O | 1.220 (4) | C13—H13A | 0.9300 |
C7—C8 | 1.458 (4) | C14—C15 | 1.383 (6) |
C7—C3 | 1.504 (5) | C14—H14A | 0.9300 |
C12—C13 | 1.402 (5) | C16—C15 | 1.368 (6) |
C12—C17 | 1.404 (5) | C16—H16A | 0.9300 |
C3—C2 | 1.379 (5) | C6—C5 | 1.371 (5) |
C3—C4 | 1.388 (4) | C6—C1 | 1.385 (5) |
C8—C9 | 1.376 (4) | C6—H6A | 0.9300 |
C19—C18 | 1.336 (4) | C15—H15A | 0.9300 |
C19—H19A | 0.9300 | C4—C5 | 1.376 (5) |
C18—C17 | 1.444 (5) | C4—H4A | 0.9300 |
C18—H18A | 0.9300 | C5—H5A | 0.9300 |
C2—C1 | 1.382 (5) | C1—H1A | 0.9300 |
C2—H2A | 0.9300 | ||
C19—N—C11 | 121.6 (3) | C8—C9—C10 | 109.2 (3) |
C19—N—C8 | 129.8 (3) | C8—C9—H9A | 125.4 |
C11—N—C8 | 108.5 (3) | C10—C9—H9A | 125.4 |
C10—C11—N | 107.6 (3) | C11—C10—C9 | 107.8 (3) |
C10—C11—C12 | 133.4 (3) | C11—C10—H10A | 126.1 |
N—C11—C12 | 118.9 (3) | C9—C10—H10A | 126.1 |
O—C7—C8 | 123.0 (3) | C14—C13—C12 | 120.0 (4) |
O—C7—C3 | 119.4 (3) | C14—C13—H13A | 120.0 |
C8—C7—C3 | 117.4 (3) | C12—C13—H13A | 120.0 |
C13—C12—C17 | 119.5 (3) | C13—C14—C15 | 120.5 (4) |
C13—C12—C11 | 121.8 (3) | C13—C14—H14A | 119.7 |
C17—C12—C11 | 118.7 (3) | C15—C14—H14A | 119.7 |
C2—C3—C4 | 119.8 (3) | C15—C16—C17 | 121.2 (4) |
C2—C3—C7 | 122.8 (3) | C15—C16—H16A | 119.4 |
C4—C3—C7 | 117.2 (3) | C17—C16—H16A | 119.4 |
C9—C8—N | 106.9 (3) | C5—C6—C1 | 120.1 (4) |
C9—C8—C7 | 130.8 (3) | C5—C6—H6A | 119.9 |
N—C8—C7 | 122.1 (3) | C1—C6—H6A | 119.9 |
C18—C19—N | 120.8 (3) | C16—C15—C14 | 120.0 (4) |
C18—C19—H19A | 119.6 | C16—C15—H15A | 120.0 |
N—C19—H19A | 119.6 | C14—C15—H15A | 120.0 |
C19—C18—C17 | 121.2 (3) | C5—C4—C3 | 119.7 (4) |
C19—C18—H18A | 119.4 | C5—C4—H4A | 120.2 |
C17—C18—H18A | 119.4 | C3—C4—H4A | 120.2 |
C3—C2—C1 | 120.2 (4) | C6—C5—C4 | 120.5 (4) |
C3—C2—H2A | 119.9 | C6—C5—H5A | 119.7 |
C1—C2—H2A | 119.9 | C4—C5—H5A | 119.7 |
C16—C17—C12 | 118.8 (4) | C6—C1—C2 | 119.6 (4) |
C16—C17—C18 | 122.5 (4) | C6—C1—H1A | 120.2 |
C12—C17—C18 | 118.6 (3) | C2—C1—H1A | 120.2 |
C19—N—C11—C10 | −178.7 (3) | C13—C12—C17—C16 | −0.1 (6) |
C8—N—C11—C10 | −0.2 (4) | C11—C12—C17—C16 | 178.8 (4) |
C19—N—C11—C12 | 3.5 (5) | C13—C12—C17—C18 | 178.0 (4) |
C8—N—C11—C12 | −178.0 (3) | C11—C12—C17—C18 | −3.0 (5) |
C10—C11—C12—C13 | 1.4 (7) | C19—C18—C17—C16 | −178.2 (4) |
N—C11—C12—C13 | 178.5 (3) | C19—C18—C17—C12 | 3.8 (6) |
C10—C11—C12—C17 | −177.5 (4) | N—C8—C9—C10 | 1.2 (4) |
N—C11—C12—C17 | −0.4 (5) | C7—C8—C9—C10 | −173.2 (4) |
O—C7—C3—C2 | 138.8 (4) | N—C11—C10—C9 | 0.9 (4) |
C8—C7—C3—C2 | −46.0 (6) | C12—C11—C10—C9 | 178.2 (4) |
O—C7—C3—C4 | −36.8 (6) | C8—C9—C10—C11 | −1.3 (5) |
C8—C7—C3—C4 | 138.3 (4) | C17—C12—C13—C14 | −1.0 (6) |
C19—N—C8—C9 | 177.8 (3) | C11—C12—C13—C14 | −179.9 (4) |
C11—N—C8—C9 | −0.6 (4) | C12—C13—C14—C15 | 1.6 (7) |
C19—N—C8—C7 | −7.2 (6) | C12—C17—C16—C15 | 0.7 (6) |
C11—N—C8—C7 | 174.4 (3) | C18—C17—C16—C15 | −177.3 (4) |
O—C7—C8—C9 | 162.9 (4) | C17—C16—C15—C14 | −0.2 (7) |
C3—C7—C8—C9 | −12.1 (6) | C13—C14—C15—C16 | −1.0 (7) |
O—C7—C8—N | −10.8 (6) | C2—C3—C4—C5 | 1.7 (6) |
C3—C7—C8—N | 174.2 (3) | C7—C3—C4—C5 | 177.5 (4) |
C11—N—C19—C18 | −2.9 (5) | C1—C6—C5—C4 | 1.4 (7) |
C8—N—C19—C18 | 178.9 (4) | C3—C4—C5—C6 | −2.2 (7) |
N—C19—C18—C17 | −0.8 (6) | C5—C6—C1—C2 | −0.1 (7) |
C4—C3—C2—C1 | −0.4 (6) | C3—C2—C1—C6 | −0.4 (7) |
C7—C3—C2—C1 | −175.9 (4) |
Experimental details
Crystal data | |
Chemical formula | C19H13NO |
Mr | 271.30 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 295 |
a, b, c (Å) | 28.637 (6), 4.0400 (8), 11.824 (2) |
β (°) | 101.02 (3) |
V (Å3) | 1342.7 (5) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.08 |
Crystal size (mm) | 0.30 × 0.20 × 0.10 |
Data collection | |
Diffractometer | Enraf–Nonius CAD-4 |
Absorption correction | ψ scan (XCAD4; Harms & Wocadlo, 1995) |
Tmin, Tmax | 0.976, 0.992 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 2351, 2351, 1388 |
Rint | 0.000 |
(sin θ/λ)max (Å−1) | 0.595 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.072, 0.139, 1.00 |
No. of reflections | 2351 |
No. of parameters | 190 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.23, −0.30 |
Absolute structure | (XCAD4; Harms & Wocadlo, 1995) |
Computer programs: CAD-4 Software (Enraf–Nonius, 1989), XCAD4 (Harms & Wocadlo, 1995), SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).
N—C19 | 1.374 (4) | C7—O | 1.220 (4) |
N—C11 | 1.392 (4) | C7—C8 | 1.458 (4) |
N—C8 | 1.399 (4) | ||
C19—N—C11 | 121.6 (3) | C10—C11—N | 107.6 (3) |
C19—N—C8 | 129.8 (3) | O—C7—C8 | 123.0 (3) |
C11—N—C8 | 108.5 (3) | O—C7—C3 | 119.4 (3) |
Acknowledgements
The authors thank Xuzhou Normal University (08XLR07) for financial support. This work was also sponsored by the Qing Lan Project (08QLT001).
References
Allen, F. H., Kennard, O., Watson, D. G., Brammer, L., Orpen, A. G. & Taylor, R. (1987). J. Chem. Soc. Perkin Trans. 2, pp. S1–19. CSD CrossRef Web of Science Google Scholar
Enraf–Nonius (1989). CAD-4 Software. Enraf–Nonius, Delft, The Netherlands. Google Scholar
Harms, K. & Wocadlo, S. (1995). XCAD4. University of Marburg, Germany. Google Scholar
Jaffrezou, J. P., Levade, T., Thurneyssen, O., Chiron, M., Bordier, C., Attal, M., Chatelain, P. & Laurent, G. (1992). Cancer Res. 52, 1352–1359. PubMed CAS Web of Science Google Scholar
Liu, Y., Zhang, Y., Shen, Y.-M., Hu, H.-W. & Xu, J.-H. (2010). Org. Biomol. Chem. doi:10.1039/c000277a. Google Scholar
Olden, K., Breton, P., Grzegorzevski, K., Yasuda, Y., Gause, B. L., Creaipe, O. A., Newton, S. A. & White, S. L. (1991). Pharmacol. Ther. 50, 285–290. CrossRef PubMed CAS Web of Science Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Spek, A. L. (2009). Acta Cryst. D65, 148–155. Web of Science CrossRef CAS IUCr Journals Google Scholar
Verna, A. K., Kesharwani, T., Singh, J., Tandon, V. & Larock, R. C. (2009). Angew. Chem. Int. Ed. 48, 1138–1143. CAS Google Scholar
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The natural and many synthetic indolizines have a diversity of biological activity and are playing an increasingly important role in developing new pharmaceuticals [Olden et al., 1991; Jaffrezou et al., 1992]. Pyrrolo[2,1-a]- isoquinolines are 7,8- benzo- fused indolizines and occur in several marine alkaloids. The synthesis of these structures is drawing much recent research interest [Verna et al., 2009]. In our research work on the direct one pot syntheses of pyrrolo[2,1-a]isoquinolines [Liu et al., 2010], we have prepared the title compound, (I), as one of the products. As part of this study, we have undertaken an X-ray crystallographic analysis of (I) in order to confirm its structure. The bond lengths and angles of the title molecule (Fig. 1) are within normal ranges (Allen et al., 1987). he fused isoquinoline-pyrrole moiety is planar. The dihedral angle between the isoquinoline-pyrrole fused ring and benzene ring is 53.73 (9)°. Although atoms C8, C11 and C19 attached to atom N are all of sp2 hybridization, their different environments cause slight differences in the N—C8, N—C11 and N—C19 bond lengths, and in the C19— N—C11, C19— N—C8 , C11—N—C8 and C10—C11—N angles (Table 1). An intramolecular C—H···O weak hydrogen bond generating an S(6) ring is observed (Table 2). The crystal packing is stabilized by van der Waals forces.