organic compounds
(3aR,6S,7aR)-7a-Bromo-2-[(4-methylphenyl)sulfonyl]-1,2,3,6,7,7a-hexahydro-3a,6-epoxyisoindole
aDepartment of Science Education, Faculty of Education, Sinop University, 57100-Sinop, Turkey, bDepartment of Chemistry, Faculty of Arts and Sciences, Nigde University, 51240-Nigde, Turkey, cDepartment of Chemistry, Faculty of Arts and Science, Mersin University, 33343-Mersin, Turkey, and dDepartment of Physics, Arts and Sciences Faculty, Ondokuz Mayıs University, 55139-Samsun, Turkey
*Correspondence e-mail: bkosar@sinop.edu.tr
In the title compound, C15H16BrNO3S, the boat form of the six-membered ring is almost symmetrical with respect to the epoxy bridge. The two five-membered rings generated by the epoxy bridge of the six-membered ring adopt envelope conformations, whereas the N-containing five-membered ring adopts a twisted conformation. In the crystal, molecules are linked by C—H⋯O hydrogen bonds.
Related literature
For general background to intramolecular Diels–Alder reactions and heteroaromatic Diels–Alder reactions, see: Dell (1998); Kappe et al. (1997); Arai et al. (2010); Lohse & Hsung (2009). For related structures, see: Koşar et al. (2006, 2007a,b). For the synthesis of the title compound and related compounds, see: Carlini et al. (1997); Hart et al. (1997); Shing et al. (1996); Karaarslan et al. (2007); Pontén & Magnusson (1997); Demircan et al. (2006); Arslan & Demircan (2008); Demircan & Parsons (1998). For puckering analysis, see: Cremer & Pople (1975).
Experimental
Crystal data
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Refinement
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Data collection: X-AREA (Stoe & Cie, 2002); cell X-AREA; data reduction: X-RED32 (Stoe & Cie, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: OLEX2 (Dolomanov et al., 2009); software used to prepare material for publication: SHELXTL (Sheldrick, 2008), OLEX2, publCIF (Westrip, 2010) and Mercury (Macrae et al., 2006).
Supporting information
10.1107/S1600536811010750/zl2354sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536811010750/zl2354Isup2.hkl
N-(2-Bromoprop-2-en-1-yl)-4-methyl-N-[(5-methyl-2-furyl)methyl]benzenesulfonamide, II, (1 g, 2.7 mmol) was stirred and heated under reflux in water (25 mL) at 372 K for two days (Fig. 2). The mixture was poured into ethyl acetate (25 mL) and the aqueous phase was washed with excess ethyl acetate (2 x 25 mL). The combined organic phases were dried over magnesium sulphate and filtered off. The solvent was then removed under reduced pressure. The residue was subjected to flash νmax (Thin film) / cm-1: 2932 (s, CH), 2161 (m, SO), 1977 (m, S=O), 1453, 1159, 1065 (s, C-O). δH (400 MHz, CDCl3): 7,67 (d, 2H, J = 8 Hz), 7.24 (d, 2H, J = 8 Hz, H10-H13), 6.40 (dd, 1H, J = 5.6 Hz, J = 1.8 Hz, AB), 6.34 (d, 1H, J = 5.6 Hz, AB), 4.95 (dd, 1H, J = 4.5 Hz, J = 1.8 Hz), 4.06 (d, 1H, J = 12 Hz), 4.01 (d, 1H, J = 12 Hz), 3.67 (d, 1H, J = 12 Hz), 3.43 (d, 1H, J = 12 Hz), 2.39 (dd, 1H, J = 4.5 Hz, J = 12 Hz), 2.36 (s, 3H), 1.63 (d, 1H, J = 12 Hz). δC (100 MHz, CDCl3): 143.8, 137.2, 134.7, 134.5, 129.9 (2 x C), 127.7 (2 x C), 97.2, 81.0, 64.0, 63.3, 47.5, 41.4, 21.7. m/z (70 eV, EI): 371,00 [M+(81Br), 42%)], 369, [M+(79Br, 42%)], 216,00 [M+(81Br)-Ts, 100%], 214 [M+(79Br)-H+Ts, 100%]. Elemental Analysis (C15H16BrNO3S): % Calculated (Found): C, 48.66 (48.72); H, 4.36 (4.39); N, 3.78 (3.74).
(Rf (Hexane:Ethyl acetate = 7:3): 0.47) to afford I (0.7 g, 70 % yield) as yellow crystals. M. p.: 396-398 K,H atoms were positioned geometrically and treated using a riding model, fixing the bond lengths at 0.96, 0.97, 0.98 and 0.93 Å for CH3, CH2, CH and CH (aromatic), respectively. The displacement parameters of the H atoms were constrained with Uiso(H) = 1.2Ueq (aromatic, methylene or methine C) or 1.5Ueq (methyl C).
Data collection: X-AREA (Stoe & Cie, 2002); cell
X-AREA (Stoe & Cie, 2002); data reduction: X-RED32 (Stoe & Cie, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: OLEX2 (Dolomanov et al., 2009); software used to prepare material for publication: SHELXTL (Sheldrick, 2008), OLEX2 (Dolomanov et al., 2009), publCIF (Westrip, 2010) and Mercury (Macrae et al., 2006).C15H16BrNO3S | F(000) = 752 |
Mr = 370.26 | Dx = 1.601 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71069 Å |
Hall symbol: -P 2ybc | Cell parameters from 10108 reflections |
a = 16.5136 (6) Å | θ = 1.5–28.0° |
b = 6.2186 (3) Å | µ = 2.82 mm−1 |
c = 16.3487 (7) Å | T = 296 K |
β = 113.802 (3)° | Prism, colourless |
V = 1536.07 (12) Å3 | 0.58 × 0.44 × 0.31 mm |
Z = 4 |
STOE IPDS 2 CCD diffractometer | 3163 independent reflections |
Radiation source: fine-focus sealed tube | 2353 reflections with I > 2σ(I) |
Plane graphite monochromator | Rint = 0.042 |
Detector resolution: 6.67 pixels mm-1 | θmax = 26.5°, θmin = 2.5° |
rotation method scans | h = −20→20 |
Absorption correction: integration (X-RED32; Stoe & Cie, 2002) | k = −7→7 |
Tmin = 0.310, Tmax = 0.495 | l = −20→20 |
7305 measured reflections |
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)] = 0.048 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.126 | H-atom parameters constrained |
S = 1.07 | w = 1/[σ2(Fo2) + (0.0617P)2 + 0.5082P] where P = (Fo2 + 2Fc2)/3 |
3163 reflections | (Δ/σ)max < 0.001 |
190 parameters | Δρmax = 0.40 e Å−3 |
0 restraints | Δρmin = −0.44 e Å−3 |
C15H16BrNO3S | V = 1536.07 (12) Å3 |
Mr = 370.26 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 16.5136 (6) Å | µ = 2.82 mm−1 |
b = 6.2186 (3) Å | T = 296 K |
c = 16.3487 (7) Å | 0.58 × 0.44 × 0.31 mm |
β = 113.802 (3)° |
STOE IPDS 2 CCD diffractometer | 3163 independent reflections |
Absorption correction: integration (X-RED32; Stoe & Cie, 2002) | 2353 reflections with I > 2σ(I) |
Tmin = 0.310, Tmax = 0.495 | Rint = 0.042 |
7305 measured reflections |
R[F2 > 2σ(F2)] = 0.048 | 0 restraints |
wR(F2) = 0.126 | H-atom parameters constrained |
S = 1.07 | Δρmax = 0.40 e Å−3 |
3163 reflections | Δρmin = −0.44 e Å−3 |
190 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 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 | ||
C1 | 0.9623 (3) | 0.6757 (7) | 0.0923 (3) | 0.0640 (11) | |
H1 | 1.0211 | 0.7174 | 0.0966 | 0.077* | |
C2 | 0.9042 (3) | 0.5742 (8) | 0.0062 (3) | 0.0681 (12) | |
H2 | 0.9082 | 0.5913 | −0.0485 | 0.082* | |
C3 | 0.8459 (3) | 0.4559 (7) | 0.0218 (3) | 0.0617 (10) | |
H3 | 0.8013 | 0.3717 | −0.0189 | 0.074* | |
C4 | 0.8668 (3) | 0.4857 (6) | 0.1192 (3) | 0.0537 (9) | |
C5 | 0.8358 (3) | 0.3394 (6) | 0.1725 (3) | 0.0642 (11) | |
H5A | 0.7765 | 0.2875 | 0.1372 | 0.077* | |
H5B | 0.8753 | 0.2172 | 0.1945 | 0.077* | |
C6 | 0.8569 (3) | 0.7032 (6) | 0.2354 (3) | 0.0519 (9) | |
H6A | 0.9170 | 0.7400 | 0.2752 | 0.062* | |
H6B | 0.8163 | 0.7984 | 0.2472 | 0.062* | |
C7 | 0.8443 (3) | 0.7184 (6) | 0.1376 (3) | 0.0489 (8) | |
C8 | 0.9107 (3) | 0.8549 (7) | 0.1161 (3) | 0.0571 (10) | |
H8A | 0.9488 | 0.9380 | 0.1674 | 0.069* | |
H8B | 0.8812 | 0.9506 | 0.0660 | 0.069* | |
C9 | 0.6718 (3) | 0.5012 (6) | 0.2434 (3) | 0.0526 (9) | |
C10 | 0.6473 (3) | 0.7028 (7) | 0.2619 (3) | 0.0617 (10) | |
H10 | 0.6869 | 0.7852 | 0.3082 | 0.074* | |
C11 | 0.5636 (4) | 0.7800 (8) | 0.2109 (4) | 0.0736 (13) | |
H11 | 0.5473 | 0.9149 | 0.2236 | 0.088* | |
C12 | 0.5033 (3) | 0.6607 (9) | 0.1410 (3) | 0.0724 (12) | |
C13 | 0.5291 (3) | 0.4605 (9) | 0.1249 (3) | 0.0725 (12) | |
H13 | 0.4891 | 0.3777 | 0.0790 | 0.087* | |
C14 | 0.6117 (3) | 0.3787 (7) | 0.1743 (3) | 0.0627 (11) | |
H14 | 0.6273 | 0.2429 | 0.1617 | 0.075* | |
C15 | 0.4125 (5) | 0.7472 (12) | 0.0862 (5) | 0.117 (2) | |
H15A | 0.3802 | 0.6448 | 0.0408 | 0.175* | |
H15B | 0.4175 | 0.8799 | 0.0586 | 0.175* | |
H15C | 0.3818 | 0.7722 | 0.1242 | 0.175* | |
N1 | 0.8373 (2) | 0.4748 (5) | 0.2466 (2) | 0.0526 (8) | |
O1 | 0.96199 (18) | 0.5098 (4) | 0.15645 (19) | 0.0589 (7) | |
O2 | 0.8163 (2) | 0.5198 (5) | 0.38595 (19) | 0.0729 (8) | |
O3 | 0.7776 (2) | 0.1766 (5) | 0.3018 (2) | 0.0707 (8) | |
S1 | 0.78021 (8) | 0.40698 (16) | 0.30290 (6) | 0.0559 (3) | |
Br1 | 0.71982 (3) | 0.78750 (8) | 0.06223 (3) | 0.06777 (18) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.060 (3) | 0.068 (3) | 0.066 (3) | 0.007 (2) | 0.028 (2) | 0.000 (2) |
C2 | 0.082 (3) | 0.067 (3) | 0.057 (2) | 0.019 (2) | 0.030 (2) | −0.001 (2) |
C3 | 0.072 (3) | 0.057 (2) | 0.055 (2) | 0.006 (2) | 0.024 (2) | −0.0128 (19) |
C4 | 0.058 (2) | 0.043 (2) | 0.054 (2) | 0.0055 (17) | 0.0174 (19) | −0.0063 (17) |
C5 | 0.088 (3) | 0.041 (2) | 0.069 (3) | −0.003 (2) | 0.038 (3) | −0.0124 (19) |
C6 | 0.062 (2) | 0.0406 (19) | 0.053 (2) | −0.0077 (17) | 0.0232 (19) | −0.0103 (17) |
C7 | 0.050 (2) | 0.0403 (18) | 0.052 (2) | 0.0033 (16) | 0.0160 (17) | −0.0051 (16) |
C8 | 0.064 (3) | 0.047 (2) | 0.061 (2) | 0.0017 (18) | 0.026 (2) | −0.0006 (18) |
C9 | 0.064 (2) | 0.044 (2) | 0.054 (2) | −0.0029 (18) | 0.029 (2) | 0.0008 (17) |
C10 | 0.069 (3) | 0.052 (2) | 0.067 (3) | −0.002 (2) | 0.031 (2) | −0.008 (2) |
C11 | 0.084 (3) | 0.059 (3) | 0.090 (3) | 0.013 (2) | 0.048 (3) | 0.003 (2) |
C12 | 0.063 (3) | 0.083 (3) | 0.073 (3) | 0.007 (2) | 0.030 (2) | 0.004 (3) |
C13 | 0.066 (3) | 0.078 (3) | 0.069 (3) | −0.011 (2) | 0.022 (2) | −0.009 (2) |
C14 | 0.068 (3) | 0.052 (2) | 0.069 (3) | −0.006 (2) | 0.029 (2) | −0.008 (2) |
C15 | 0.087 (4) | 0.140 (6) | 0.113 (5) | 0.038 (4) | 0.029 (4) | 0.004 (4) |
N1 | 0.065 (2) | 0.0388 (16) | 0.0541 (18) | 0.0059 (14) | 0.0239 (16) | −0.0009 (13) |
O1 | 0.0538 (16) | 0.0582 (17) | 0.0582 (16) | 0.0158 (13) | 0.0159 (13) | 0.0002 (13) |
O2 | 0.092 (2) | 0.077 (2) | 0.0429 (14) | −0.0032 (18) | 0.0201 (15) | −0.0060 (14) |
O3 | 0.089 (2) | 0.0489 (17) | 0.0693 (19) | 0.0038 (15) | 0.0267 (18) | 0.0154 (14) |
S1 | 0.0708 (7) | 0.0462 (5) | 0.0474 (5) | 0.0020 (4) | 0.0203 (5) | 0.0036 (4) |
Br1 | 0.0521 (2) | 0.0697 (3) | 0.0701 (3) | 0.0172 (2) | 0.01277 (19) | 0.0041 (2) |
C1—O1 | 1.472 (5) | C8—H8A | 0.9700 |
C1—C2 | 1.487 (7) | C8—H8B | 0.9700 |
C1—C8 | 1.544 (6) | C9—C10 | 1.388 (6) |
C1—H1 | 0.9800 | C9—C14 | 1.392 (6) |
C2—C3 | 1.316 (7) | C9—S1 | 1.757 (4) |
C2—H2 | 0.9300 | C10—C11 | 1.380 (7) |
C3—C4 | 1.498 (5) | C10—H10 | 0.9300 |
C3—H3 | 0.9300 | C11—C12 | 1.390 (8) |
C4—O1 | 1.446 (5) | C11—H11 | 0.9300 |
C4—C5 | 1.487 (6) | C12—C13 | 1.375 (7) |
C4—C7 | 1.553 (5) | C12—C15 | 1.502 (8) |
C5—N1 | 1.467 (5) | C13—C14 | 1.373 (7) |
C5—H5A | 0.9700 | C13—H13 | 0.9300 |
C5—H5B | 0.9700 | C14—H14 | 0.9300 |
C6—N1 | 1.484 (5) | C15—H15A | 0.9600 |
C6—C7 | 1.530 (5) | C15—H15B | 0.9600 |
C6—H6A | 0.9700 | C15—H15C | 0.9600 |
C6—H6B | 0.9700 | N1—S1 | 1.616 (3) |
C7—C8 | 1.535 (6) | O2—S1 | 1.427 (3) |
C7—Br1 | 1.971 (4) | O3—S1 | 1.433 (3) |
O1—C1—C2 | 101.0 (4) | C1—C8—H8A | 111.7 |
O1—C1—C8 | 99.5 (3) | C7—C8—H8B | 111.7 |
C2—C1—C8 | 109.5 (4) | C1—C8—H8B | 111.7 |
O1—C1—H1 | 115.0 | H8A—C8—H8B | 109.5 |
C2—C1—H1 | 115.0 | C10—C9—C14 | 119.7 (4) |
C8—C1—H1 | 115.0 | C10—C9—S1 | 120.1 (3) |
C3—C2—C1 | 107.2 (4) | C14—C9—S1 | 120.1 (3) |
C3—C2—H2 | 126.4 | C11—C10—C9 | 119.5 (4) |
C1—C2—H2 | 126.4 | C11—C10—H10 | 120.3 |
C2—C3—C4 | 105.3 (4) | C9—C10—H10 | 120.3 |
C2—C3—H3 | 127.3 | C10—C11—C12 | 121.4 (4) |
C4—C3—H3 | 127.3 | C10—C11—H11 | 119.3 |
O1—C4—C5 | 112.9 (3) | C12—C11—H11 | 119.3 |
O1—C4—C3 | 101.9 (3) | C13—C12—C11 | 117.8 (5) |
C5—C4—C3 | 124.1 (4) | C13—C12—C15 | 121.5 (5) |
O1—C4—C7 | 97.3 (3) | C11—C12—C15 | 120.7 (5) |
C5—C4—C7 | 106.9 (3) | C14—C13—C12 | 122.3 (5) |
C3—C4—C7 | 110.5 (3) | C14—C13—H13 | 118.8 |
N1—C5—C4 | 103.8 (3) | C12—C13—H13 | 118.8 |
N1—C5—H5A | 111.0 | C13—C14—C9 | 119.3 (4) |
C4—C5—H5A | 111.0 | C13—C14—H14 | 120.4 |
N1—C5—H5B | 111.0 | C9—C14—H14 | 120.4 |
C4—C5—H5B | 111.0 | C12—C15—H15A | 109.5 |
H5A—C5—H5B | 109.0 | C12—C15—H15B | 109.5 |
N1—C6—C7 | 104.1 (3) | H15A—C15—H15B | 109.5 |
N1—C6—H6A | 110.9 | C12—C15—H15C | 109.5 |
C7—C6—H6A | 110.9 | H15A—C15—H15C | 109.5 |
N1—C6—H6B | 110.9 | H15B—C15—H15C | 109.5 |
C7—C6—H6B | 110.9 | C5—N1—C6 | 112.2 (3) |
H6A—C6—H6B | 108.9 | C5—N1—S1 | 120.1 (3) |
C6—C7—C8 | 117.7 (3) | C6—N1—S1 | 121.8 (2) |
C6—C7—C4 | 101.7 (3) | C4—O1—C1 | 95.1 (3) |
C8—C7—C4 | 102.9 (3) | O2—S1—O3 | 120.16 (19) |
C6—C7—Br1 | 109.5 (3) | O2—S1—N1 | 107.28 (19) |
C8—C7—Br1 | 113.4 (3) | O3—S1—N1 | 105.97 (18) |
C4—C7—Br1 | 110.7 (3) | O2—S1—C9 | 107.7 (2) |
C7—C8—C1 | 100.1 (3) | O3—S1—C9 | 107.9 (2) |
C7—C8—H8A | 111.7 | N1—S1—C9 | 107.18 (17) |
O1—C1—C2—C3 | 31.5 (4) | C10—C11—C12—C13 | 1.0 (7) |
C8—C1—C2—C3 | −72.9 (5) | C10—C11—C12—C15 | −180.0 (5) |
C1—C2—C3—C4 | 0.8 (5) | C11—C12—C13—C14 | −1.0 (7) |
C2—C3—C4—O1 | −33.6 (4) | C15—C12—C13—C14 | −180.0 (5) |
C2—C3—C4—C5 | −162.1 (4) | C12—C13—C14—C9 | 0.2 (7) |
C2—C3—C4—C7 | 68.9 (4) | C10—C9—C14—C13 | 0.6 (6) |
O1—C4—C5—N1 | 80.2 (4) | S1—C9—C14—C13 | −176.0 (3) |
C3—C4—C5—N1 | −156.0 (4) | C4—C5—N1—C6 | 7.1 (5) |
C7—C4—C5—N1 | −25.6 (4) | C4—C5—N1—S1 | 160.4 (3) |
N1—C6—C7—C8 | −139.8 (3) | C7—C6—N1—C5 | 14.3 (5) |
N1—C6—C7—C4 | −28.3 (4) | C7—C6—N1—S1 | −138.6 (3) |
N1—C6—C7—Br1 | 88.8 (3) | C5—C4—O1—C1 | −174.3 (3) |
O1—C4—C7—C6 | −82.6 (3) | C3—C4—O1—C1 | 50.3 (3) |
C5—C4—C7—C6 | 34.1 (4) | C7—C4—O1—C1 | −62.5 (3) |
C3—C4—C7—C6 | 171.8 (3) | C2—C1—O1—C4 | −49.4 (3) |
O1—C4—C7—C8 | 39.7 (4) | C8—C1—O1—C4 | 62.7 (3) |
C5—C4—C7—C8 | 156.4 (4) | C5—N1—S1—O2 | 160.6 (3) |
C3—C4—C7—C8 | −65.9 (4) | C6—N1—S1—O2 | −48.6 (4) |
O1—C4—C7—Br1 | 161.2 (2) | C5—N1—S1—O3 | 31.1 (4) |
C5—C4—C7—Br1 | −82.2 (4) | C6—N1—S1—O3 | −178.1 (3) |
C3—C4—C7—Br1 | 55.6 (4) | C5—N1—S1—C9 | −83.9 (3) |
C6—C7—C8—C1 | 108.8 (4) | C6—N1—S1—C9 | 66.9 (3) |
C4—C7—C8—C1 | −2.0 (4) | C10—C9—S1—O2 | 23.2 (4) |
Br1—C7—C8—C1 | −121.5 (3) | C14—C9—S1—O2 | −160.2 (3) |
O1—C1—C8—C7 | −35.8 (4) | C10—C9—S1—O3 | 154.3 (3) |
C2—C1—C8—C7 | 69.5 (4) | C14—C9—S1—O3 | −29.1 (4) |
C14—C9—C10—C11 | −0.6 (6) | C10—C9—S1—N1 | −92.0 (3) |
S1—C9—C10—C11 | 176.1 (3) | C14—C9—S1—N1 | 84.6 (3) |
C9—C10—C11—C12 | −0.3 (7) |
D—H···A | D—H | H···A | D···A | D—H···A |
C6—H6A···O1i | 0.97 | 2.50 | 3.382 (6) | 151 |
C10—H10···O2 | 0.93 | 2.59 | 2.937 (6) | 103 |
Symmetry code: (i) −x+2, y+1/2, −z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C15H16BrNO3S |
Mr | 370.26 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 296 |
a, b, c (Å) | 16.5136 (6), 6.2186 (3), 16.3487 (7) |
β (°) | 113.802 (3) |
V (Å3) | 1536.07 (12) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 2.82 |
Crystal size (mm) | 0.58 × 0.44 × 0.31 |
Data collection | |
Diffractometer | STOE IPDS 2 CCD diffractometer |
Absorption correction | Integration (X-RED32; Stoe & Cie, 2002) |
Tmin, Tmax | 0.310, 0.495 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 7305, 3163, 2353 |
Rint | 0.042 |
(sin θ/λ)max (Å−1) | 0.628 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.048, 0.126, 1.07 |
No. of reflections | 3163 |
No. of parameters | 190 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.40, −0.44 |
Computer programs: X-AREA (Stoe & Cie, 2002), X-RED32 (Stoe & Cie, 2002), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), OLEX2 (Dolomanov et al., 2009), SHELXTL (Sheldrick, 2008), OLEX2 (Dolomanov et al., 2009), publCIF (Westrip, 2010) and Mercury (Macrae et al., 2006).
D—H···A | D—H | H···A | D···A | D—H···A |
C6—H6A···O1i | 0.97 | 2.50 | 3.382 (6) | 151 |
C10—H10···O2 | 0.93 | 2.59 | 2.937 (6) | 103 |
Symmetry code: (i) −x+2, y+1/2, −z+1/2. |
Acknowledgements
The authors acknowledge the Faculty of Arts and Sciences, Ondokuz Mayıs University, Turkey, for the use of the diffractometer (purchased under grant F.279 of University Research Fund) and also the Scientific & Technological Research Council of Turkey (TÜBİTAK) for financial support of this work (PN: 107 T831).
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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.
Thermal intramolecular [4 + 2] type cycloaddition processes, or intramolecular Diels Alder (IMDA) reactions, have been a highly useful tool for the construction of many cycloaddition products (Dell, 1998). The IMDA reaction is especially useful for asymmetrical syntheses towards natural products such as, (±)-xestoquinone (Carlini et al., 1997), (+)-himbelive (Hart et al., 1997) and (S)-(±)-carvone (Shing et al., 1996). In this context, the use of heteroaromatic compounds has been gaining popularity (Kappe et al., 1997). IMDA reactions with furan derivatives, called IMDAF, have been widely used for the construction of some new molecules (Karaarslan et al., 2007; Pontén & Magnusson, 1997; Demircan et al., 2006; Koşar et al., 2007a; Koşar et al., 2007b; Arslan & Demircan, 2008; Demircan & Parsons, 1998; Koşar et al., 2006). These compounds have been used as strategic intermediates in combinatorial synthesis.
In view of a recent literature research (Arai et al., 2010; Lohse & Hsung, 2009), we would like to report here a thermal IMDAF reaction of an alkenyl furan with a nitrogen linked chain which undergoes intramolecular cycloaddition upon heating to 371 K for two days (Fig. 1 and 2). The product of the intramolecular thermal cycloaddition reaction of compound (I) was characterized by 1H NMR, 13C NMR, FT-IR, MS, elemental analysis and X-ray single crystal diffraction studies. Despite of the presence of three new stereocenters in the product molecules only one pair of mirror symmetric enatiomers was formed in the reaction, i.e. the intramolecular thermal cycloaddition of II to I is diastereoselective under the chosen reaction conditions.
Related with the above mentioned reaction, we presented here the crystal structure of the title compound, C15H16BrNO3S. Fig. 1 shows the molecular structure of the title compound, I. The pyrrolidine (C4/C5/N1/C6/C7) ring adopts a twisted conformation with a total puckering parameter QT value of 0.329 (5) Å (Cremer & Pople, 1975). The tetrahydrofuran (O1/C1-C4) and bromo-attached tetrahydrofuran (O1/C4/C7/C8/C1) rings adopt envelope conformations with total puckering parameters of 0.514 (5) and 0.627 (5) Å, respectively.
The title compound displays an intramolecular hydrogen bond between atoms C10 and O2 and the crystal structure is stabilized by weak van der Waals interactions and a weak intermolecular hydrogen bond, C6—H6a···O1 in a three dimensional network (Fig. 3). Geometrical parameters of the intra- and intermolecular H-bonds are listed in Table 1.