organic compounds
8a-Methyl-5,6,8,8a,9,10-hexahydro-10,12a-epoxyisoindolo[1,2-a]isoquinolinium iodide
aDepartment of Chemistry, University of Douala, Faculty of Sciences, PO Box 24157, Douala, Republic of Cameroon, bDepartment of Organic Chemistry, Russian People's Friendship University, 6 Miklukho-Maklaya St, Moscow 117198, Russian Federation, cDepartment of Organic Chemistry, Ivan Franko National University of Lviv, 6 Kyryla and Mefodiya St, Lviv 79005, Ukraine, and dX-Ray Structural Centre, A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov St, B-334, Moscow 119991, Russian Federation
*Correspondence e-mail: vkh@xray.ineos.ac.ru
The title compound, C17H18NO+·I−, is an adduct resulting from an intramolecular Diels–Alder reaction of methallyl chloride with 3,4-dihydro-1-furylisoquinoline. The cation comprises a fused pentacyclic system containing three five-membered rings (dihydropyrrole, dihydrofuran and tetrahydrofuran) and two six-membered rings (tetrahydropyridine and benzene). The five-membered rings have the usual envelope conformations, and the central six-membered tetrahydropyridine ring adopts the unsymmetrical half-boat conformation. In the crystal, cations and iodide anions are bound by weak intermolecular hydrogen-bonding interactions into a three-dimensional framework.
Related literature
For general background to the method proposed by our group for obtaining hydrogenated isoindolo[2,1-a]isoquinolines using commercially available furfurals and phenethylamines as starting materials, see: Zubkov et al. (2004); Boltukhina et al. (2006). For related structures, see: Tagmazyan et al. (1976, 1977); Ahmad et al. (1987); Rasheed et al. (1991); Zubkov et al. (2009).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2005); cell SAINT-Plus (Bruker, 2001); data reduction: SAINT-Plus; 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.
Supporting information
https://doi.org/10.1107/S1600536810017903/rk2205sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810017903/rk2205Isup2.hkl
Potassium iodide (3.1 g, 11 mmol) and methallylchloride (0.8 ml, 8.25 mmol) were added to a solution of 1-furyl-3,4-dihydroisoquinoline (1.08 g, 5.5 mmol) in dioxane (50 ml). The reaction mixture was refluxed for 5 h (monitoring by TLC until disappearance of the starting compound sport). At the end of the reaction, solvent was removed under reduced pressure and the residue was crystallized from ethyl acetate–ethanol mixture to give 0.35 g of isoquinolinium iodide as brown prisms (Fig. 3). Yield is 17%. The single crystals of product I were obtained by slow crystallization from acetonitrile (yield 73%). M.p. = 451–453 K. Rf = 0.3 (ethyl acetate–ethanol, 4:1). IR (KBr), ν/cm-1: 1632, 2361, 2947, 3399. 1H NMR (CDCl3, 400 MHz, 300 K): δ = 1.33 (s, 3H, Me), 1.38 (d. 1H, H9 (endo), J9A,9B = 11.8), 2.50 (dd, 1H, H9 (exo), J9(exo),10 = 4.4, J9A,9B = 11.8), 3.33 (ddd, 1H, H5B, J5B,6A = 2.5, J5B,6B = 5.6, J5A,5B = 16.8), 4.01 (m, 1H, H5A), 4.15 (m, 1H, H6A), 4.32 (d, 1H, H8B, J8A,8B = 14.0), 4.84 (d, 1H, H8A, J8A,8B = 14.0), 5.04 (ddd, 1H, H6B, J6B,5A = 3.1, J6B,5B = 7.5, J6A,6B = 15.0), 5.36 (dd, 2H, H10, J10,11 = 1.2, J9(exo),10 = 4.4), 6.79 (d, 1H, H11, J10,11 = 1.2, J11,12 = 5.6), 6.83 (d, 1H, H12, J11,12 = 5.6), 7.50 (br, 1H, H2, J1,2 = J2,3 = 7.5), 7.54 (d, 1H, H4, J3,4 = 7.5), 7.82 (t, 1H, H3, J2,3 = J3,4 = 7.5), 7.85 (d, 1H, H1, J1,2 = 7.5). Anal. Calcd for C17H18INO: C, 53.84; H, 4.78; N, 3.69. Found: C, 53.67; H, 4.65; N, 3.62.
The hydrogen atoms were placed in calculated positions with C—H = 0.95–1.00Å and refined in the riding model with fixed isotropic displacement parameters - Uiso(H) = 1.5Ueq(C) for CH3-group and Uiso(H) = 1.2Ueq(C) for the other groups.
Recently our group has proposed an efficient approach (Zubkov et al., 2009) to potentially bioactive substances - hydrogenated isoindolo[2,1-a]isoquinolines using commercially available furfurals and phenethylamines as starting materials (Boltukhina et al., 2006). The intramolecular furan Diels–Alder reaction (IMDAF) (Zubkov et al., 2004) between unsaturated acid derivatives and the furan core of the
was the key step of the transformations mentioned above.Trying to apply our chemistry to target natural products, we were attracted to isoindoloisoquinoline
Today, there are three known natural containing the isoindolo[2,1-a]isoquinoline skeleton - Nuevamine, Jamtine (and its N-oxide) and Hirsutine (Rasheed et al., 1991).This work realizes aforementioned approach and describes the structure of an alkaloid-like IMDAF product I containing the nodal iminium nitrogen atom (Tagmazyan et al., 1976; Ahmad et al., 1987).
Compound I, [C17H18NO+][I-], is the adduct of intramolecular Diels–Alder reaction of methallyl chloride with 3,4-dihydro-1-furylisoquinoline. The cation of I comprises a fused pentacyclic system containing three five-membered rings (dihydropyrrole, dihydrofuran and tetrahydrofuran) and two six-membered rings (tetrahydropyridine and benzene) (Fig. 1). The five-membered rings have usual envelope conformations, and the central six-membered tetrahydropyridine ring adopts the unsymmetrical half-boat conformation. The nitrogen N7 atom has a trigonal-planar geometry (sum of the bond angles is 359.5°). The dihedral angle between the planes of the dihydropyrrole (N7/C8/C12A/C12B) and benzene rings is 20.1 (1)°.
The cation of I possesses three asymmetric centers at the C8A, C10 and C12A carbon atoms and can have potentially eight
The crystal of I is racemic and consists of enantiomeric pairs with the following of the centers: rac-8 AR*,10R*,12 AR*.The crystal packing of the cations of I is stacking along the b axis (Fig. 2). In the crystal, the cations and iodide anions are bound by the weak intermolecular hydrogen bonding interactions into 3-dimensional framework (Fig. 2, Table 1).
For general background to the method proposed by our group for obtaining hydrogenated isoindolo[2,1-a]isoquinolines using commercially available furfurals and phenethylamines as starting materials, see: Zubkov et al. (2004); Boltukhina et al. (2006). For related structures, see: Tagmazyan et al. (1976, 1977); Ahmad et al. (1987); Rasheed et al. (1991); Zubkov et al. (2009).
Data collection: APEX2 (Bruker, 2005); cell
SAINT-Plus (Bruker, 2001); data reduction: SAINT-Plus (Bruker, 2001); 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).Fig. 1. Molecular structure of I. Displacement ellipsoids are shown at the 50% probability level. H atoms are presented as a small spheres of arbitrary radius. | |
Fig. 2. Crystal packing of I along the b axis. Dashed lines indicate the weak intermolecular C—H···I hydrogen bonding interactions. | |
Fig. 3. Tandem alkylation/[4+2] cycloaddition reaction of methallyl chloride with 3,4-dihydro-1-furylisoquinoline. |
C17H18NO+·I− | F(000) = 1504 |
Mr = 379.22 | Dx = 1.648 Mg m−3 |
Monoclinic, C2/c | Melting point: 452 K |
Hall symbol: -C 2yc | Mo Kα radiation, λ = 0.71073 Å |
a = 15.5047 (6) Å | Cell parameters from 7921 reflections |
b = 8.0757 (3) Å | θ = 2.7–32.5° |
c = 25.1874 (12) Å | µ = 2.09 mm−1 |
β = 104.204 (1)° | T = 100 K |
V = 3057.3 (2) Å3 | Prism, orange |
Z = 8 | 0.30 × 0.20 × 0.15 mm |
Bruker APEXII CCD diffractometer | 4450 independent reflections |
Radiation source: fine-focus sealed tube | 4123 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.031 |
φ and ω scans | θmax = 30.0°, θmin = 1.7° |
Absorption correction: multi-scan (SADABS; Sheldrick, 2003) | h = −21→21 |
Tmin = 0.573, Tmax = 0.745 | k = −11→11 |
18881 measured reflections | l = −35→35 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.025 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.054 | H-atom parameters constrained |
S = 1.00 | w = 1/[σ2(Fo2) + (0.0195P)2 + 6.6P] where P = (Fo2 + 2Fc2)/3 |
4450 reflections | (Δ/σ)max = 0.002 |
182 parameters | Δρmax = 0.48 e Å−3 |
0 restraints | Δρmin = −0.94 e Å−3 |
C17H18NO+·I− | V = 3057.3 (2) Å3 |
Mr = 379.22 | Z = 8 |
Monoclinic, C2/c | Mo Kα radiation |
a = 15.5047 (6) Å | µ = 2.09 mm−1 |
b = 8.0757 (3) Å | T = 100 K |
c = 25.1874 (12) Å | 0.30 × 0.20 × 0.15 mm |
β = 104.204 (1)° |
Bruker APEXII CCD diffractometer | 4450 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 2003) | 4123 reflections with I > 2σ(I) |
Tmin = 0.573, Tmax = 0.745 | Rint = 0.031 |
18881 measured reflections |
R[F2 > 2σ(F2)] = 0.025 | 0 restraints |
wR(F2) = 0.054 | H-atom parameters constrained |
S = 1.00 | Δρmax = 0.48 e Å−3 |
4450 reflections | Δρmin = −0.94 e Å−3 |
182 parameters |
Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'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. |
x | y | z | Uiso*/Ueq | ||
I1 | 0.325921 (8) | 0.080703 (16) | 0.405918 (5) | 0.02178 (4) | |
O1 | 0.45929 (8) | 0.66340 (17) | 0.33020 (5) | 0.0191 (3) | |
C1 | 0.61820 (12) | 0.8559 (2) | 0.27922 (7) | 0.0184 (3) | |
H1 | 0.5871 | 0.7567 | 0.2663 | 0.022* | |
C1A | 0.63271 (12) | 0.9011 (2) | 0.33406 (7) | 0.0165 (3) | |
C2 | 0.64969 (13) | 0.9574 (2) | 0.24349 (8) | 0.0206 (4) | |
H2 | 0.6392 | 0.9292 | 0.2058 | 0.025* | |
C3 | 0.69669 (13) | 1.1005 (2) | 0.26325 (8) | 0.0226 (4) | |
H3 | 0.7178 | 1.1700 | 0.2387 | 0.027* | |
C4 | 0.71330 (13) | 1.1433 (2) | 0.31838 (8) | 0.0206 (4) | |
H4 | 0.7472 | 1.2395 | 0.3314 | 0.025* | |
C4A | 0.68027 (12) | 1.0454 (2) | 0.35434 (8) | 0.0183 (3) | |
C5 | 0.69532 (13) | 1.0806 (2) | 0.41463 (8) | 0.0214 (4) | |
H5A | 0.7106 | 1.1989 | 0.4217 | 0.026* | |
H5B | 0.7458 | 1.0134 | 0.4353 | 0.026* | |
C6 | 0.61228 (13) | 1.0400 (2) | 0.43404 (8) | 0.0205 (4) | |
H6A | 0.6255 | 1.0475 | 0.4745 | 0.025* | |
H6B | 0.5646 | 1.1204 | 0.4184 | 0.025* | |
N7 | 0.58279 (10) | 0.8714 (2) | 0.41628 (6) | 0.0174 (3) | |
C8 | 0.52789 (12) | 0.7704 (2) | 0.44453 (7) | 0.0192 (3) | |
H8A | 0.4659 | 0.8114 | 0.4365 | 0.023* | |
H8B | 0.5530 | 0.7705 | 0.4847 | 0.023* | |
C8A | 0.53246 (12) | 0.5980 (2) | 0.42045 (7) | 0.0175 (3) | |
C9 | 0.44431 (13) | 0.4996 (3) | 0.40199 (8) | 0.0228 (4) | |
H9A | 0.3945 | 0.5575 | 0.4123 | 0.027* | |
H9B | 0.4501 | 0.3866 | 0.4177 | 0.027* | |
C10 | 0.43173 (13) | 0.4959 (3) | 0.33880 (8) | 0.0223 (4) | |
H10 | 0.3704 | 0.4661 | 0.3174 | 0.027* | |
C11 | 0.50568 (14) | 0.3957 (2) | 0.32470 (8) | 0.0221 (4) | |
H11 | 0.5008 | 0.2876 | 0.3094 | 0.027* | |
C12 | 0.57905 (12) | 0.4890 (2) | 0.33795 (7) | 0.0187 (3) | |
H12 | 0.6365 | 0.4647 | 0.3329 | 0.022* | |
C12A | 0.54908 (11) | 0.6422 (2) | 0.36281 (7) | 0.0158 (3) | |
C12B | 0.59353 (12) | 0.8077 (2) | 0.37104 (7) | 0.0162 (3) | |
C13 | 0.60762 (13) | 0.4998 (3) | 0.45782 (8) | 0.0225 (4) | |
H13A | 0.5933 | 0.4803 | 0.4931 | 0.034* | |
H13B | 0.6632 | 0.5628 | 0.4637 | 0.034* | |
H13C | 0.6146 | 0.3934 | 0.4406 | 0.034* |
U11 | U22 | U33 | U12 | U13 | U23 | |
I1 | 0.02024 (6) | 0.02454 (7) | 0.01967 (6) | −0.00275 (5) | 0.00320 (4) | −0.00284 (5) |
O1 | 0.0163 (6) | 0.0212 (6) | 0.0176 (6) | 0.0003 (5) | 0.0001 (5) | 0.0018 (5) |
C1 | 0.0191 (8) | 0.0182 (8) | 0.0174 (8) | −0.0002 (7) | 0.0039 (6) | −0.0004 (7) |
C1A | 0.0178 (8) | 0.0158 (8) | 0.0161 (8) | 0.0015 (6) | 0.0044 (6) | 0.0012 (6) |
C2 | 0.0208 (8) | 0.0240 (9) | 0.0180 (8) | 0.0010 (7) | 0.0067 (7) | 0.0004 (7) |
C3 | 0.0219 (9) | 0.0225 (9) | 0.0249 (9) | 0.0008 (7) | 0.0087 (7) | 0.0048 (7) |
C4 | 0.0193 (8) | 0.0174 (8) | 0.0256 (9) | −0.0007 (7) | 0.0064 (7) | −0.0006 (7) |
C4A | 0.0163 (8) | 0.0177 (8) | 0.0199 (8) | 0.0007 (6) | 0.0028 (6) | −0.0009 (6) |
C5 | 0.0230 (9) | 0.0215 (9) | 0.0193 (8) | −0.0031 (7) | 0.0043 (7) | −0.0033 (7) |
C6 | 0.0268 (9) | 0.0176 (8) | 0.0183 (8) | −0.0021 (7) | 0.0079 (7) | −0.0035 (7) |
N7 | 0.0200 (7) | 0.0164 (7) | 0.0162 (7) | −0.0001 (6) | 0.0051 (6) | 0.0003 (6) |
C8 | 0.0213 (8) | 0.0213 (9) | 0.0161 (8) | −0.0003 (7) | 0.0066 (6) | 0.0006 (7) |
C8A | 0.0178 (8) | 0.0191 (8) | 0.0157 (8) | −0.0016 (6) | 0.0045 (6) | 0.0011 (6) |
C9 | 0.0215 (9) | 0.0265 (10) | 0.0209 (9) | −0.0070 (7) | 0.0058 (7) | 0.0003 (8) |
C10 | 0.0199 (8) | 0.0245 (10) | 0.0217 (9) | −0.0063 (7) | 0.0032 (7) | −0.0005 (7) |
C11 | 0.0273 (9) | 0.0190 (9) | 0.0191 (8) | −0.0031 (7) | 0.0038 (7) | −0.0008 (7) |
C12 | 0.0206 (8) | 0.0184 (8) | 0.0172 (8) | 0.0014 (7) | 0.0046 (7) | −0.0002 (7) |
C12A | 0.0152 (7) | 0.0171 (8) | 0.0151 (7) | −0.0011 (6) | 0.0034 (6) | 0.0010 (6) |
C12B | 0.0167 (8) | 0.0164 (8) | 0.0147 (7) | 0.0013 (6) | 0.0021 (6) | 0.0006 (6) |
C13 | 0.0246 (9) | 0.0242 (10) | 0.0178 (8) | 0.0029 (7) | 0.0036 (7) | 0.0047 (7) |
O1—C12A | 1.443 (2) | N7—C8 | 1.481 (2) |
O1—C10 | 1.451 (2) | C8—C8A | 1.527 (3) |
C1—C2 | 1.391 (3) | C8—H8A | 0.9900 |
C1—C1A | 1.393 (2) | C8—H8B | 0.9900 |
C1—H1 | 0.9500 | C8A—C13 | 1.528 (3) |
C1A—C4A | 1.406 (3) | C8A—C9 | 1.550 (3) |
C1A—C12B | 1.443 (2) | C8A—C12A | 1.576 (2) |
C2—C3 | 1.391 (3) | C9—C10 | 1.555 (3) |
C2—H2 | 0.9500 | C9—H9A | 0.9900 |
C3—C4 | 1.392 (3) | C9—H9B | 0.9900 |
C3—H3 | 0.9500 | C10—C11 | 1.515 (3) |
C4—C4A | 1.392 (3) | C10—H10 | 1.0000 |
C4—H4 | 0.9500 | C11—C12 | 1.337 (3) |
C4A—C5 | 1.506 (3) | C11—H11 | 0.9500 |
C5—C6 | 1.521 (3) | C12—C12A | 1.510 (3) |
C5—H5A | 0.9900 | C12—H12 | 0.9500 |
C5—H5B | 0.9900 | C12A—C12B | 1.495 (3) |
C6—N7 | 1.470 (2) | C13—H13A | 0.9800 |
C6—H6A | 0.9900 | C13—H13B | 0.9800 |
C6—H6B | 0.9900 | C13—H13C | 0.9800 |
N7—C12B | 1.298 (2) | ||
C12A—O1—C10 | 94.73 (13) | C8—C8A—C13 | 109.33 (15) |
C2—C1—C1A | 119.36 (18) | C8—C8A—C9 | 117.58 (16) |
C2—C1—H1 | 120.3 | C13—C8A—C9 | 113.69 (16) |
C1A—C1—H1 | 120.3 | C8—C8A—C12A | 101.17 (14) |
C1—C1A—C4A | 121.36 (17) | C13—C8A—C12A | 114.35 (15) |
C1—C1A—C12B | 120.78 (17) | C9—C8A—C12A | 99.85 (14) |
C4A—C1A—C12B | 117.70 (16) | C8A—C9—C10 | 101.35 (14) |
C1—C2—C3 | 119.60 (18) | C8A—C9—H9A | 111.5 |
C1—C2—H2 | 120.2 | C10—C9—H9A | 111.5 |
C3—C2—H2 | 120.2 | C8A—C9—H9B | 111.5 |
C2—C3—C4 | 121.04 (18) | C10—C9—H9B | 111.5 |
C2—C3—H3 | 119.5 | H9A—C9—H9B | 109.3 |
C4—C3—H3 | 119.5 | O1—C10—C11 | 101.25 (15) |
C4A—C4—C3 | 120.02 (18) | O1—C10—C9 | 99.63 (15) |
C4A—C4—H4 | 120.0 | C11—C10—C9 | 109.76 (16) |
C3—C4—H4 | 120.0 | O1—C10—H10 | 114.8 |
C4—C4A—C1A | 118.58 (18) | C11—C10—H10 | 114.8 |
C4—C4A—C5 | 123.94 (17) | C9—C10—H10 | 114.8 |
C1A—C4A—C5 | 117.44 (17) | C12—C11—C10 | 106.70 (17) |
C4A—C5—C6 | 110.45 (16) | C12—C11—H11 | 126.7 |
C4A—C5—H5A | 109.6 | C10—C11—H11 | 126.7 |
C6—C5—H5A | 109.6 | C11—C12—C12A | 103.62 (16) |
C4A—C5—H5B | 109.6 | C11—C12—H12 | 128.2 |
C6—C5—H5B | 109.6 | C12A—C12—H12 | 128.2 |
H5A—C5—H5B | 108.1 | O1—C12A—C12B | 108.67 (14) |
N7—C6—C5 | 109.06 (15) | O1—C12A—C12 | 102.32 (14) |
N7—C6—H6A | 109.9 | C12B—C12A—C12 | 127.70 (16) |
C5—C6—H6A | 109.9 | O1—C12A—C8A | 101.44 (13) |
N7—C6—H6B | 109.9 | C12B—C12A—C8A | 104.40 (14) |
C5—C6—H6B | 109.9 | C12—C12A—C8A | 109.46 (15) |
H6A—C6—H6B | 108.3 | N7—C12B—C1A | 121.63 (17) |
C12B—N7—C6 | 122.46 (16) | N7—C12B—C12A | 108.79 (15) |
C12B—N7—C8 | 114.58 (16) | C1A—C12B—C12A | 129.10 (16) |
C6—N7—C8 | 122.45 (15) | C8A—C13—H13A | 109.5 |
N7—C8—C8A | 102.91 (14) | C8A—C13—H13B | 109.5 |
N7—C8—H8A | 111.2 | H13A—C13—H13B | 109.5 |
C8A—C8—H8A | 111.2 | C8A—C13—H13C | 109.5 |
N7—C8—H8B | 111.2 | H13A—C13—H13C | 109.5 |
C8A—C8—H8B | 111.2 | H13B—C13—H13C | 109.5 |
H8A—C8—H8B | 109.1 | ||
C2—C1—C1A—C4A | −1.4 (3) | C10—C11—C12—C12A | 2.8 (2) |
C2—C1—C1A—C12B | 173.85 (17) | C10—O1—C12A—C12B | −169.84 (14) |
C1A—C1—C2—C3 | 1.3 (3) | C10—O1—C12A—C12 | 52.90 (15) |
C1—C2—C3—C4 | 0.4 (3) | C10—O1—C12A—C8A | −60.19 (15) |
C2—C3—C4—C4A | −2.1 (3) | C11—C12—C12A—O1 | −35.95 (18) |
C3—C4—C4A—C1A | 2.0 (3) | C11—C12—C12A—C12B | −161.61 (17) |
C3—C4—C4A—C5 | 179.45 (18) | C11—C12—C12A—C8A | 71.05 (18) |
C1—C1A—C4A—C4 | −0.2 (3) | C8—C8A—C12A—O1 | −86.84 (15) |
C12B—C1A—C4A—C4 | −175.63 (16) | C13—C8A—C12A—O1 | 155.78 (15) |
C1—C1A—C4A—C5 | −177.87 (17) | C9—C8A—C12A—O1 | 34.03 (17) |
C12B—C1A—C4A—C5 | 6.7 (2) | C8—C8A—C12A—C12B | 26.06 (17) |
C4—C4A—C5—C6 | 142.02 (19) | C13—C8A—C12A—C12B | −91.31 (18) |
C1A—C4A—C5—C6 | −40.5 (2) | C9—C8A—C12A—C12B | 146.94 (15) |
C4A—C5—C6—N7 | 51.2 (2) | C8—C8A—C12A—C12 | 165.56 (14) |
C5—C6—N7—C12B | −32.4 (2) | C13—C8A—C12A—C12 | 48.2 (2) |
C5—C6—N7—C8 | 156.17 (16) | C9—C8A—C12A—C12 | −73.57 (17) |
C12B—N7—C8—C8A | 20.2 (2) | C6—N7—C12B—C1A | −2.2 (3) |
C6—N7—C8—C8A | −167.72 (16) | C8—N7—C12B—C1A | 169.88 (16) |
N7—C8—C8A—C13 | 94.15 (16) | C6—N7—C12B—C12A | −174.87 (16) |
N7—C8—C8A—C9 | −134.27 (16) | C8—N7—C12B—C12A | −2.8 (2) |
N7—C8—C8A—C12A | −26.83 (17) | C1—C1A—C12B—N7 | −158.84 (18) |
C8—C8A—C9—C10 | 112.08 (18) | C4A—C1A—C12B—N7 | 16.6 (3) |
C13—C8A—C9—C10 | −118.35 (17) | C1—C1A—C12B—C12A | 12.3 (3) |
C12A—C8A—C9—C10 | 3.87 (18) | C4A—C1A—C12B—C12A | −172.30 (17) |
C12A—O1—C10—C11 | −50.15 (15) | O1—C12A—C12B—N7 | 92.29 (17) |
C12A—O1—C10—C9 | 62.39 (15) | C12—C12A—C12B—N7 | −144.62 (18) |
C8A—C9—C10—O1 | −40.39 (17) | C8A—C12A—C12B—N7 | −15.34 (19) |
C8A—C9—C10—C11 | 65.35 (19) | O1—C12A—C12B—C1A | −79.7 (2) |
O1—C10—C11—C12 | 30.66 (19) | C12—C12A—C12B—C1A | 43.4 (3) |
C9—C10—C11—C12 | −74.0 (2) | C8A—C12A—C12B—C1A | 172.67 (17) |
D—H···A | D—H | H···A | D···A | D—H···A |
C2—H2···I1i | 0.95 | 3.23 | 3.999 (2) | 139 |
C6—H6A···I1ii | 0.99 | 3.10 | 4.028 (2) | 157 |
C8—H8A···I1iii | 0.99 | 3.04 | 3.942 (2) | 153 |
C8—H8B···I1ii | 0.99 | 3.17 | 4.072 (2) | 153 |
C9—H9B···I1 | 0.99 | 3.10 | 3.862 (2) | 135 |
C12—H12···I1iv | 0.95 | 3.20 | 3.862 (2) | 128 |
C13—H13B···I1iv | 0.98 | 3.21 | 3.970 (2) | 136 |
Symmetry codes: (i) −x+1, y+1, −z+1/2; (ii) −x+1, −y+1, −z+1; (iii) x, y+1, z; (iv) x+1/2, y+1/2, z. |
Experimental details
Crystal data | |
Chemical formula | C17H18NO+·I− |
Mr | 379.22 |
Crystal system, space group | Monoclinic, C2/c |
Temperature (K) | 100 |
a, b, c (Å) | 15.5047 (6), 8.0757 (3), 25.1874 (12) |
β (°) | 104.204 (1) |
V (Å3) | 3057.3 (2) |
Z | 8 |
Radiation type | Mo Kα |
µ (mm−1) | 2.09 |
Crystal size (mm) | 0.30 × 0.20 × 0.15 |
Data collection | |
Diffractometer | Bruker APEXII CCD |
Absorption correction | Multi-scan (SADABS; Sheldrick, 2003) |
Tmin, Tmax | 0.573, 0.745 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 18881, 4450, 4123 |
Rint | 0.031 |
(sin θ/λ)max (Å−1) | 0.703 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.025, 0.054, 1.00 |
No. of reflections | 4450 |
No. of parameters | 182 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.48, −0.94 |
Computer programs: APEX2 (Bruker, 2005), SAINT-Plus (Bruker, 2001), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
C2—H2···I1i | 0.95 | 3.23 | 3.999 (2) | 139 |
C6—H6A···I1ii | 0.99 | 3.10 | 4.028 (2) | 157 |
C8—H8A···I1iii | 0.99 | 3.04 | 3.942 (2) | 153 |
C8—H8B···I1ii | 0.99 | 3.17 | 4.072 (2) | 153 |
C9—H9B···I1 | 0.99 | 3.10 | 3.862 (2) | 135 |
C12—H12···I1iv | 0.95 | 3.20 | 3.862 (2) | 128 |
C13—H13B···I1iv | 0.98 | 3.21 | 3.970 (2) | 136 |
Symmetry codes: (i) −x+1, y+1, −z+1/2; (ii) −x+1, −y+1, −z+1; (iii) x, y+1, z; (iv) x+1/2, y+1/2, z. |
References
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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.
Recently our group has proposed an efficient approach (Zubkov et al., 2009) to potentially bioactive substances - hydrogenated isoindolo[2,1-a]isoquinolines using commercially available furfurals and phenethylamines as starting materials (Boltukhina et al., 2006). The intramolecular furan Diels–Alder reaction (IMDAF) (Zubkov et al., 2004) between unsaturated acid derivatives and the furan core of the amines was the key step of the transformations mentioned above.
Trying to apply our chemistry to target natural products, we were attracted to isoindoloisoquinoline alkaloids. Today, there are three known natural alkaloids containing the isoindolo[2,1-a]isoquinoline skeleton - Nuevamine, Jamtine (and its N-oxide) and Hirsutine (Rasheed et al., 1991).
This work realizes aforementioned approach and describes the structure of an alkaloid-like IMDAF product I containing the nodal iminium nitrogen atom (Tagmazyan et al., 1976; Ahmad et al., 1987).
Compound I, [C17H18NO+][I-], is the adduct of intramolecular Diels–Alder reaction of methallyl chloride with 3,4-dihydro-1-furylisoquinoline. The cation of I comprises a fused pentacyclic system containing three five-membered rings (dihydropyrrole, dihydrofuran and tetrahydrofuran) and two six-membered rings (tetrahydropyridine and benzene) (Fig. 1). The five-membered rings have usual envelope conformations, and the central six-membered tetrahydropyridine ring adopts the unsymmetrical half-boat conformation. The nitrogen N7 atom has a trigonal-planar geometry (sum of the bond angles is 359.5°). The dihedral angle between the planes of the dihydropyrrole (N7/C8/C12A/C12B) and benzene rings is 20.1 (1)°.
The cation of I possesses three asymmetric centers at the C8A, C10 and C12A carbon atoms and can have potentially eight diastereomers. The crystal of I is racemic and consists of enantiomeric pairs with the following relative configuration of the centers: rac-8 AR*,10R*,12 AR*.
The crystal packing of the cations of I is stacking along the b axis (Fig. 2). In the crystal, the cations and iodide anions are bound by the weak intermolecular hydrogen bonding interactions into 3-dimensional framework (Fig. 2, Table 1).