Acta Cryst. (2010). E66, o206-o207 [ doi:10.1107/S160053680905363X ]
The title compound, C26H28N2O9·1.5H2O, the product of an acid-catalysed Wagner-Meerwein skeletal rearrangement, crystallizes as a sesquihydrate with the O atom of one of the two independent water molecules occupying a special position on a twofold axis. The organic molecule comprises a fused pentacyclic system containing two five-membered rings (cyclopentane and tetrahydrofuran) and three six-membered rings (piperidinone, tetrahydropyridine and benzene). The five-membered rings have the usual envelope conformations, and the central six-membered piperidinone and tetrahydropyridine rings adopt boat and sofa conformations, respectively. In the crystal, there are three independent O-H
O hydrogen bonds, which link the organic molecules and water molecules into complex two-tier layers parallel to (001). The layers are further linked into a three-dimensional framework by attractive intermolecular carbonyl-carbonyl interactions.
Boron trifluoride etherate (0.3 ml, 2.4 mmol) was added to a solution of methyl (1aR*,2R*,3R*,3aS*,10R*,11aR*,11bR*,11cR*)-4-oxo-10-(2-oxopyrrolidin-1-yl)-1a,2,3,3a,4,11,11a,11c-octahydro-10H-2,11b-epoxyoxireno[6,7]isoindolo[2,1-a]quinoline-3-carboxylate (0.51 g, 1.2 mmol) in 15 ml of acetic anhydride. The mixture was stirred for 2 h at 296 K, then it was diluted with 100 ml of water and treated with a saturated solution of sodium carbonate until pH ~ 8–9. Organic products were extracted with chloroform (3 x 50 ml). The extract was dried (MgSO4), concentrated and purified by crystallization from hexane-ethyl acetate to give 0.41 g (0.8 mmol) of the polycycle (I) as colourless rhomboid-shaped blocks (Fig. 3). Yield is 67%. The single crystals of product (I) were obtained by slow crystallization from a mixture of 95% ethanol-DMF (yield 30%). M.p. = 460–462 K. IR, ν (cm-1): 1673, 1744 (NCO, CO2Me, COMe). Mass spectrum, m/z (Ir(%)): 512 [M+] (3), 452 (100), 397 (38), 363 (32), 308 (31), 280 (55), 265 (28), 248 (22), 213 (47), 196 (25), 130 (86), 43 (62). 1H NMR (CDCl3, 293 K): δ = 7.87 (dd, 1H, H1, J1,2 = 8.4, J1,3 = 1.2), 7.18 (ddd, 1H, H2, J1,2 = 8.4, J2,3 = 6.9, J2,4 = 2.0), 7.06 (ddd, 1H, H3, J3,4 = 7.9, J2,3 = 6.9, J1,3 = 1.2), 7.02 (d, 1H, H4, J3,4 = 7.9, J2,4 = 2.0), 5.56 (dd, 1H, H5, J5,6 A = 11.3, J5,6B = 8.2), 4.93 (d, 1H, H8, J7a,8 = 1.9), 4.76 (bs, 1H, H9), 4.22 (dd, 1H, H6a, J6a,6 A = 12.0, J6a,6B = 1.7), 4.05 (dd, 1H, H7a, J7a,10a = 4.7, J7a,8 = 1.9), 3.59 (s, 3H, CO2Me), 3.36 (dd, 1H, H10a, J7a,10a = 4.7, J10,10a = 11.3), 3.33 (m, 1H, H5A'), 3.23 (d, 1H, H10, J10,10a = 11.3), 3.00 (m, 1H, H5B'), 2.54 (ddd, 1H, H6A, J6 A,6B = 13.3, J6a,6 A = 12.0, J5,6 A = 11.3), 2.43 (m, 2H, H3'), 2.28 (ddd, 1H, H6B, J6 A,6B = 13.3, J5,6B = 8.2, J6a,6B = 1.7), 2.07 (s, 3H, COMe), 2.05 (s, 3H, COMe), 1.93 (m, 2H, H4'). 13C NMR (CDC13, 293 K): δ = 175.5 (s, C2'), 169.1, 169.7 (s, COMe), 168.3 (s, CO2Me), 165.0 (s, C11), 137.9 (s, C12a), 127.6 (d, C4, J = 158.6), 127.3 (d, C2, J = 161.4), 126.4 (s, C4a), 125.5 (d, C3, J = 162.0), 125.1 (d, C1, J = 165.7), 106.2 (s, C7), 81.4 (d, C9, J = 172.0), 76.3 (d, C8, J = 159.0), 58.5 (d, C6a, J = 142.7), 52.1 (q, CO2Me, J = 147.7), 47.6 (d, C5, J = 139.0), 46.4 (d, C10, J = 139.0), 42.0 (t, C5', J = 145.0), 41.3 (d, C7a, J = 158.5), 39.3 (d, C10a, J = 143.5), 31.1 (t, C3', J = 133.0), 25.2 (t, C6, J = 134.0), 20.6, 21.7 (q, COMe, J = 130.2), 17.8 (t, C4', J = 134.0).
The hydrogen atoms of the solvate water molecules were located in the difference Fourier map; C-bound H atoms were placed geometrically (C—H 0.95 Å, 0.98 Å, 0.99 Å, and 1.00 Å for aromatic, methyl, methylene and methine H atoms respectively) and included in the refinement in riding motion approximation [Uiso(H) = 1.2Ueq(C) for non-methyl H atoms; Uiso(H) = 1.5Ueq of the caryying atom for methyl and O-bound H atoms].
Data collection: APEX2 (Bruker, 2005); cell refinement: 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).
| C26H28N2O9·1.5H2O | F(000) = 2280 |
| Mr = 539.53 | Dx = 1.438 Mg m−3 |
| Monoclinic, C2/c | Mo Kα radiation, λ = 0.71073 Å |
| Hall symbol: -C 2yc | Cell parameters from 9578 reflections |
| a = 16.8557 (5) Å | θ = 2.4–28.6° |
| b = 9.9692 (3) Å | µ = 0.11 mm−1 |
| c = 29.6704 (8) Å | T = 100 K |
| β = 90.035 (1)° | Prism, colourless |
| V = 4985.7 (2) Å3 | 0.30 × 0.20 × 0.20 mm |
| Z = 8 |
| Bruker SMART APEXII CCD diffractometer | 6460 independent reflections |
| Radiation source: fine-focus sealed tube | 5531 reflections with I > 2σ(I) |
| graphite | Rint = 0.031 |
| φ and ω scans | θmax = 28.7°, θmin = 1.4° |
| Absorption correction: multi-scan (SADABS; Sheldrick, 2003) | h = −22→22 |
| Tmin = 0.969, Tmax = 0.979 | k = −13→13 |
| 29541 measured reflections | l = −40→40 |
| 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)] = 0.040 | Hydrogen site location: difference Fourier map |
| wR(F2) = 0.106 | H-atom parameters constrained |
| S = 1.00 | w = 1/[σ2(Fo2) + (0.054P)2 + 5.5P] where P = (Fo2 + 2Fc2)/3 |
| 6460 reflections | (Δ/σ)max = 0.001 |
| 351 parameters | Δρmax = 0.45 e Å−3 |
| 0 restraints | Δρmin = −0.27 e Å−3 |
| C26H28N2O9·1.5H2O | V = 4985.7 (2) Å3 |
| Mr = 539.53 | Z = 8 |
| Monoclinic, C2/c | Mo Kα radiation |
| a = 16.8557 (5) Å | µ = 0.11 mm−1 |
| b = 9.9692 (3) Å | T = 100 K |
| c = 29.6704 (8) Å | 0.30 × 0.20 × 0.20 mm |
| β = 90.035 (1)° |
| Bruker SMART APEXII CCD diffractometer | 6460 independent reflections |
| Absorption correction: multi-scan (SADABS; Sheldrick, 2003) | 5531 reflections with I > 2σ(I) |
| Tmin = 0.969, Tmax = 0.979 | Rint = 0.031 |
| 29541 measured reflections | θmax = 28.7° |
| R[F2 > 2σ(F2)] = 0.040 | H-atom parameters constrained |
| wR(F2) = 0.106 | Δρmax = 0.45 e Å−3 |
| S = 1.00 | Δρmin = −0.27 e Å−3 |
| 6460 reflections | Absolute structure: ? |
| 351 parameters | Flack parameter: ? |
| 0 restraints | Rogers parameter: ? |
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 | ||
| O1 | 0.08324 (6) | 0.49746 (10) | 0.20077 (3) | 0.0214 (2) | |
| O2 | 0.00452 (5) | 0.32130 (8) | 0.37846 (3) | 0.01336 (17) | |
| O3 | −0.08727 (5) | 0.45915 (10) | 0.40862 (3) | 0.01900 (19) | |
| O4 | 0.03384 (5) | 0.19384 (8) | 0.45989 (3) | 0.01436 (18) | |
| O5 | −0.02640 (6) | 0.27537 (10) | 0.52181 (3) | 0.0218 (2) | |
| O6 | 0.28555 (5) | 0.48346 (9) | 0.38299 (3) | 0.01877 (19) | |
| O7 | 0.33899 (5) | 0.31262 (10) | 0.42233 (3) | 0.0201 (2) | |
| O8 | 0.20831 (5) | 0.72008 (9) | 0.43497 (3) | 0.01602 (18) | |
| O13 | 0.13523 (5) | 0.30526 (8) | 0.38994 (3) | 0.01262 (17) | |
| N1 | 0.15989 (6) | 0.61656 (11) | 0.25045 (3) | 0.0150 (2) | |
| N12 | 0.11703 (6) | 0.63699 (10) | 0.38547 (3) | 0.01132 (19) | |
| C1 | 0.10122 (7) | 0.88174 (12) | 0.37973 (4) | 0.0144 (2) | |
| H1A | 0.1086 | 0.8900 | 0.4114 | 0.017* | |
| C2 | 0.08267 (7) | 0.99401 (13) | 0.35419 (5) | 0.0178 (2) | |
| H2A | 0.0771 | 1.0788 | 0.3684 | 0.021* | |
| C3 | 0.07217 (8) | 0.98311 (13) | 0.30770 (5) | 0.0193 (3) | |
| H3A | 0.0585 | 1.0596 | 0.2903 | 0.023* | |
| C4 | 0.08197 (7) | 0.85918 (13) | 0.28724 (4) | 0.0173 (2) | |
| H4A | 0.0762 | 0.8521 | 0.2555 | 0.021* | |
| C4A | 0.10008 (7) | 0.74439 (12) | 0.31227 (4) | 0.0135 (2) | |
| C5 | 0.10420 (7) | 0.60998 (12) | 0.28818 (4) | 0.0133 (2) | |
| H5A | 0.0505 | 0.5934 | 0.2750 | 0.016* | |
| C6 | 0.12172 (7) | 0.49241 (12) | 0.31990 (4) | 0.0137 (2) | |
| H6A | 0.1026 | 0.4074 | 0.3065 | 0.016* | |
| H6B | 0.1795 | 0.4847 | 0.3252 | 0.016* | |
| C6A | 0.07874 (7) | 0.52004 (11) | 0.36417 (4) | 0.0113 (2) | |
| H6C | 0.0234 | 0.5476 | 0.3563 | 0.014* | |
| C7 | 0.07219 (7) | 0.39834 (11) | 0.39507 (4) | 0.0114 (2) | |
| C7A | 0.07365 (7) | 0.43157 (11) | 0.44532 (4) | 0.0116 (2) | |
| H7A | 0.0254 | 0.4772 | 0.4576 | 0.014* | |
| C8 | 0.09388 (7) | 0.29490 (12) | 0.46591 (4) | 0.0131 (2) | |
| H8A | 0.1106 | 0.3029 | 0.4981 | 0.016* | |
| C9 | 0.16441 (7) | 0.27200 (12) | 0.43475 (4) | 0.0131 (2) | |
| H9A | 0.1901 | 0.1819 | 0.4374 | 0.016* | |
| C10 | 0.21730 (7) | 0.39149 (12) | 0.44830 (4) | 0.0132 (2) | |
| H10A | 0.2409 | 0.3741 | 0.4787 | 0.016* | |
| C10A | 0.15354 (7) | 0.50606 (12) | 0.45219 (4) | 0.0119 (2) | |
| H10B | 0.1544 | 0.5376 | 0.4842 | 0.014* | |
| C11 | 0.16372 (7) | 0.62952 (12) | 0.42287 (4) | 0.0124 (2) | |
| C12A | 0.10911 (7) | 0.75633 (12) | 0.35899 (4) | 0.0123 (2) | |
| C13 | 0.14485 (7) | 0.55735 (13) | 0.21039 (4) | 0.0155 (2) | |
| C14 | 0.21733 (8) | 0.57640 (14) | 0.18066 (4) | 0.0197 (3) | |
| H14A | 0.2018 | 0.6014 | 0.1496 | 0.024* | |
| H14B | 0.2500 | 0.4939 | 0.1797 | 0.024* | |
| C15 | 0.26181 (8) | 0.69058 (14) | 0.20379 (5) | 0.0216 (3) | |
| H15A | 0.2436 | 0.7790 | 0.1926 | 0.026* | |
| H15B | 0.3197 | 0.6828 | 0.1990 | 0.026* | |
| C16 | 0.24042 (8) | 0.67116 (14) | 0.25359 (5) | 0.0202 (3) | |
| H16A | 0.2769 | 0.6073 | 0.2685 | 0.024* | |
| H16B | 0.2411 | 0.7574 | 0.2701 | 0.024* | |
| C17 | −0.07050 (7) | 0.35993 (12) | 0.38683 (4) | 0.0145 (2) | |
| C18 | −0.12828 (8) | 0.26323 (14) | 0.36648 (5) | 0.0205 (3) | |
| H18A | −0.1816 | 0.2819 | 0.3780 | 0.031* | |
| H18B | −0.1131 | 0.1714 | 0.3745 | 0.031* | |
| H18C | −0.1280 | 0.2730 | 0.3336 | 0.031* | |
| C19 | −0.02611 (7) | 0.19880 (12) | 0.49049 (4) | 0.0150 (2) | |
| C20 | −0.09028 (8) | 0.09958 (14) | 0.47986 (5) | 0.0210 (3) | |
| H20A | −0.1002 | 0.0432 | 0.5063 | 0.032* | |
| H20B | −0.0736 | 0.0431 | 0.4545 | 0.032* | |
| H20C | −0.1390 | 0.1476 | 0.4718 | 0.032* | |
| C21 | 0.28295 (7) | 0.40599 (12) | 0.41401 (4) | 0.0144 (2) | |
| C22 | 0.40460 (8) | 0.30901 (15) | 0.39090 (5) | 0.0238 (3) | |
| H22A | 0.4416 | 0.2377 | 0.3996 | 0.036* | |
| H22B | 0.4322 | 0.3955 | 0.3913 | 0.036* | |
| H22C | 0.3845 | 0.2914 | 0.3605 | 0.036* | |
| O9 | 0.25847 (5) | 0.98922 (9) | 0.44722 (3) | 0.01930 (19) | |
| H9B | 0.3064 | 0.9874 | 0.4350 | 0.029* | |
| H9C | 0.2420 | 0.9089 | 0.4431 | 0.029* | |
| O10 | 0.0000 | 0.28215 (16) | 0.2500 | 0.0342 (4) | |
| H10C | 0.0262 | 0.3392 | 0.2313 | 0.051* |
| U11 | U22 | U33 | U12 | U13 | U23 | |
| O1 | 0.0179 (4) | 0.0277 (5) | 0.0185 (4) | −0.0027 (4) | 0.0003 (3) | −0.0069 (4) |
| O2 | 0.0130 (4) | 0.0114 (4) | 0.0157 (4) | −0.0023 (3) | −0.0013 (3) | −0.0015 (3) |
| O3 | 0.0147 (4) | 0.0209 (5) | 0.0214 (5) | 0.0001 (3) | 0.0021 (3) | −0.0032 (4) |
| O4 | 0.0158 (4) | 0.0125 (4) | 0.0148 (4) | −0.0026 (3) | 0.0036 (3) | −0.0001 (3) |
| O5 | 0.0213 (5) | 0.0226 (5) | 0.0214 (5) | −0.0037 (4) | 0.0067 (4) | −0.0056 (4) |
| O6 | 0.0165 (4) | 0.0191 (4) | 0.0208 (5) | −0.0011 (3) | 0.0021 (3) | 0.0033 (4) |
| O7 | 0.0137 (4) | 0.0207 (5) | 0.0260 (5) | 0.0043 (3) | 0.0035 (4) | 0.0039 (4) |
| O8 | 0.0160 (4) | 0.0141 (4) | 0.0180 (4) | −0.0033 (3) | −0.0019 (3) | −0.0005 (3) |
| O13 | 0.0133 (4) | 0.0111 (4) | 0.0134 (4) | 0.0024 (3) | 0.0011 (3) | −0.0004 (3) |
| N1 | 0.0146 (5) | 0.0183 (5) | 0.0122 (5) | −0.0034 (4) | 0.0021 (4) | −0.0009 (4) |
| N12 | 0.0135 (5) | 0.0090 (4) | 0.0115 (4) | −0.0016 (3) | 0.0002 (4) | −0.0003 (3) |
| C1 | 0.0136 (5) | 0.0135 (5) | 0.0161 (5) | −0.0005 (4) | 0.0003 (4) | −0.0016 (4) |
| C2 | 0.0163 (6) | 0.0119 (5) | 0.0253 (6) | −0.0001 (4) | 0.0005 (5) | −0.0003 (5) |
| C3 | 0.0183 (6) | 0.0145 (6) | 0.0251 (7) | 0.0001 (5) | −0.0018 (5) | 0.0062 (5) |
| C4 | 0.0172 (6) | 0.0187 (6) | 0.0161 (6) | −0.0013 (5) | −0.0015 (5) | 0.0031 (5) |
| C4A | 0.0116 (5) | 0.0144 (5) | 0.0145 (5) | −0.0011 (4) | 0.0011 (4) | 0.0006 (4) |
| C5 | 0.0135 (5) | 0.0151 (5) | 0.0113 (5) | −0.0015 (4) | 0.0013 (4) | 0.0000 (4) |
| C6 | 0.0166 (5) | 0.0120 (5) | 0.0125 (5) | −0.0002 (4) | 0.0015 (4) | −0.0012 (4) |
| C6A | 0.0128 (5) | 0.0100 (5) | 0.0112 (5) | −0.0010 (4) | −0.0001 (4) | −0.0005 (4) |
| C7 | 0.0101 (5) | 0.0104 (5) | 0.0138 (5) | −0.0013 (4) | 0.0006 (4) | −0.0010 (4) |
| C7A | 0.0124 (5) | 0.0104 (5) | 0.0119 (5) | −0.0008 (4) | 0.0011 (4) | 0.0001 (4) |
| C8 | 0.0137 (5) | 0.0113 (5) | 0.0144 (5) | −0.0015 (4) | 0.0008 (4) | 0.0004 (4) |
| C9 | 0.0126 (5) | 0.0122 (5) | 0.0145 (5) | 0.0009 (4) | 0.0000 (4) | 0.0017 (4) |
| C10 | 0.0125 (5) | 0.0130 (5) | 0.0140 (5) | 0.0007 (4) | −0.0005 (4) | 0.0008 (4) |
| C10A | 0.0123 (5) | 0.0119 (5) | 0.0115 (5) | −0.0002 (4) | −0.0003 (4) | 0.0002 (4) |
| C11 | 0.0116 (5) | 0.0128 (5) | 0.0127 (5) | 0.0008 (4) | 0.0019 (4) | −0.0011 (4) |
| C12A | 0.0107 (5) | 0.0113 (5) | 0.0149 (5) | −0.0004 (4) | 0.0008 (4) | 0.0016 (4) |
| C13 | 0.0176 (6) | 0.0154 (6) | 0.0135 (5) | 0.0022 (4) | 0.0011 (4) | 0.0009 (4) |
| C14 | 0.0200 (6) | 0.0225 (6) | 0.0167 (6) | 0.0002 (5) | 0.0058 (5) | −0.0004 (5) |
| C15 | 0.0210 (6) | 0.0198 (6) | 0.0241 (7) | −0.0025 (5) | 0.0083 (5) | 0.0002 (5) |
| C16 | 0.0159 (6) | 0.0231 (6) | 0.0215 (6) | −0.0054 (5) | 0.0032 (5) | −0.0035 (5) |
| C17 | 0.0134 (5) | 0.0158 (5) | 0.0143 (5) | −0.0022 (4) | 0.0007 (4) | 0.0042 (4) |
| C18 | 0.0175 (6) | 0.0206 (6) | 0.0234 (6) | −0.0071 (5) | −0.0028 (5) | 0.0011 (5) |
| C19 | 0.0151 (5) | 0.0139 (5) | 0.0159 (6) | 0.0007 (4) | 0.0018 (4) | 0.0030 (4) |
| C20 | 0.0198 (6) | 0.0208 (6) | 0.0224 (6) | −0.0065 (5) | 0.0024 (5) | 0.0001 (5) |
| C21 | 0.0122 (5) | 0.0137 (5) | 0.0173 (6) | −0.0017 (4) | −0.0012 (4) | −0.0019 (4) |
| C22 | 0.0150 (6) | 0.0259 (7) | 0.0303 (7) | 0.0029 (5) | 0.0068 (5) | −0.0008 (6) |
| O9 | 0.0175 (4) | 0.0153 (4) | 0.0252 (5) | −0.0005 (3) | 0.0021 (4) | −0.0030 (4) |
| O10 | 0.0438 (10) | 0.0258 (8) | 0.0331 (9) | 0.000 | 0.0011 (7) | 0.000 |
| O1—C13 | 1.2314 (16) | C7—C7A | 1.5276 (16) |
| O2—C17 | 1.3453 (15) | C7A—C8 | 1.5316 (16) |
| O2—C7 | 1.4605 (13) | C7A—C10A | 1.5512 (16) |
| O3—C17 | 1.2151 (16) | C7A—H7A | 1.0000 |
| O4—C19 | 1.3597 (15) | C8—C9 | 1.5237 (16) |
| O4—C8 | 1.4391 (14) | C8—H8A | 1.0000 |
| O5—C19 | 1.2027 (16) | C9—C10 | 1.5410 (16) |
| O6—C21 | 1.2023 (15) | C9—H9A | 1.0000 |
| O7—C21 | 1.3488 (15) | C10—C21 | 1.5107 (16) |
| O7—C22 | 1.4475 (16) | C10—C10A | 1.5725 (16) |
| O8—C11 | 1.2282 (15) | C10—H10A | 1.0000 |
| O13—C7 | 1.4189 (14) | C10A—C11 | 1.5171 (16) |
| O13—C9 | 1.4558 (14) | C10A—H10B | 1.0000 |
| N1—C13 | 1.3509 (16) | C13—C14 | 1.5192 (17) |
| N1—C5 | 1.4629 (15) | C14—C15 | 1.5258 (19) |
| N1—C16 | 1.4652 (16) | C14—H14A | 0.9900 |
| N12—C11 | 1.3620 (15) | C14—H14B | 0.9900 |
| N12—C12A | 1.4320 (15) | C15—C16 | 1.5334 (19) |
| N12—C6A | 1.4747 (14) | C15—H15A | 0.9900 |
| C1—C2 | 1.3872 (17) | C15—H15B | 0.9900 |
| C1—C12A | 1.3999 (16) | C16—H16A | 0.9900 |
| C1—H1A | 0.9500 | C16—H16B | 0.9900 |
| C2—C3 | 1.3948 (19) | C17—C18 | 1.4972 (17) |
| C2—H2A | 0.9500 | C18—H18A | 0.9800 |
| C3—C4 | 1.3865 (18) | C18—H18B | 0.9800 |
| C3—H3A | 0.9500 | C18—H18C | 0.9800 |
| C4—C4A | 1.3979 (17) | C19—C20 | 1.4991 (17) |
| C4—H4A | 0.9500 | C20—H20A | 0.9800 |
| C4A—C12A | 1.3994 (17) | C20—H20B | 0.9800 |
| C4A—C5 | 1.5203 (17) | C20—H20C | 0.9800 |
| C5—C6 | 1.5316 (16) | C22—H22A | 0.9800 |
| C5—H5A | 1.0000 | C22—H22B | 0.9800 |
| C6—C6A | 1.5256 (16) | C22—H22C | 0.9800 |
| C6—H6A | 0.9900 | O9—H9B | 0.8858 |
| C6—H6B | 0.9900 | O9—H9C | 0.8567 |
| C6A—C7 | 1.5248 (16) | O10—H10C | 0.9089 |
| C6A—H6C | 1.0000 | ||
| C17—O2—C7 | 121.40 (9) | C21—C10—C9 | 108.79 (10) |
| C19—O4—C8 | 114.49 (9) | C21—C10—C10A | 118.74 (10) |
| C21—O7—C22 | 115.75 (10) | C9—C10—C10A | 100.68 (9) |
| C7—O13—C9 | 107.67 (8) | C21—C10—H10A | 109.4 |
| C13—N1—C5 | 122.24 (10) | C9—C10—H10A | 109.4 |
| C13—N1—C16 | 113.05 (10) | C10A—C10—H10A | 109.4 |
| C5—N1—C16 | 124.25 (10) | C11—C10A—C7A | 114.30 (9) |
| C11—N12—C12A | 123.10 (10) | C11—C10A—C10 | 118.02 (9) |
| C11—N12—C6A | 123.95 (10) | C7A—C10A—C10 | 103.65 (9) |
| C12A—N12—C6A | 112.39 (9) | C11—C10A—H10B | 106.7 |
| C2—C1—C12A | 120.12 (11) | C7A—C10A—H10B | 106.7 |
| C2—C1—H1A | 119.9 | C10—C10A—H10B | 106.7 |
| C12A—C1—H1A | 119.9 | O8—C11—N12 | 123.44 (11) |
| C1—C2—C3 | 120.38 (12) | O8—C11—C10A | 119.88 (11) |
| C1—C2—H2A | 119.8 | N12—C11—C10A | 116.49 (10) |
| C3—C2—H2A | 119.8 | C4A—C12A—C1 | 120.08 (11) |
| C4—C3—C2 | 119.17 (12) | C4A—C12A—N12 | 118.88 (10) |
| C4—C3—H3A | 120.4 | C1—C12A—N12 | 120.64 (10) |
| C2—C3—H3A | 120.4 | O1—C13—N1 | 125.01 (12) |
| C3—C4—C4A | 121.52 (12) | O1—C13—C14 | 127.19 (12) |
| C3—C4—H4A | 119.2 | N1—C13—C14 | 107.80 (11) |
| C4A—C4—H4A | 119.2 | C13—C14—C15 | 103.14 (10) |
| C4—C4A—C12A | 118.70 (11) | C13—C14—H14A | 111.1 |
| C4—C4A—C5 | 118.80 (11) | C15—C14—H14A | 111.1 |
| C12A—C4A—C5 | 122.39 (11) | C13—C14—H14B | 111.1 |
| N1—C5—C4A | 110.47 (10) | C15—C14—H14B | 111.1 |
| N1—C5—C6 | 112.39 (10) | H14A—C14—H14B | 109.1 |
| C4A—C5—C6 | 113.24 (10) | C14—C15—C16 | 102.90 (10) |
| N1—C5—H5A | 106.8 | C14—C15—H15A | 111.2 |
| C4A—C5—H5A | 106.8 | C16—C15—H15A | 111.2 |
| C6—C5—H5A | 106.8 | C14—C15—H15B | 111.2 |
| C6A—C6—C5 | 107.42 (9) | C16—C15—H15B | 111.2 |
| C6A—C6—H6A | 110.2 | H15A—C15—H15B | 109.1 |
| C5—C6—H6A | 110.2 | N1—C16—C15 | 101.78 (11) |
| C6A—C6—H6B | 110.2 | N1—C16—H16A | 111.4 |
| C5—C6—H6B | 110.2 | C15—C16—H16A | 111.4 |
| H6A—C6—H6B | 108.5 | N1—C16—H16B | 111.4 |
| N12—C6A—C7 | 113.78 (9) | C15—C16—H16B | 111.4 |
| N12—C6A—C6 | 107.69 (9) | H16A—C16—H16B | 109.3 |
| C7—C6A—C6 | 114.12 (9) | O3—C17—O2 | 123.39 (11) |
| N12—C6A—H6C | 106.9 | O3—C17—C18 | 125.97 (12) |
| C7—C6A—H6C | 106.9 | O2—C17—C18 | 110.64 (11) |
| C6—C6A—H6C | 106.9 | C17—C18—H18A | 109.5 |
| O13—C7—O2 | 101.80 (8) | C17—C18—H18B | 109.5 |
| O13—C7—C6A | 113.66 (9) | H18A—C18—H18B | 109.5 |
| O2—C7—C6A | 105.80 (9) | C17—C18—H18C | 109.5 |
| O13—C7—C7A | 103.59 (9) | H18A—C18—H18C | 109.5 |
| O2—C7—C7A | 117.11 (9) | H18B—C18—H18C | 109.5 |
| C6A—C7—C7A | 114.40 (9) | O5—C19—O4 | 122.84 (11) |
| C7—C7A—C8 | 101.53 (9) | O5—C19—C20 | 125.32 (12) |
| C7—C7A—C10A | 104.21 (9) | O4—C19—C20 | 111.84 (11) |
| C8—C7A—C10A | 100.39 (9) | C19—C20—H20A | 109.5 |
| C7—C7A—H7A | 116.1 | C19—C20—H20B | 109.5 |
| C8—C7A—H7A | 116.1 | H20A—C20—H20B | 109.5 |
| C10A—C7A—H7A | 116.1 | C19—C20—H20C | 109.5 |
| O4—C8—C9 | 111.63 (9) | H20A—C20—H20C | 109.5 |
| O4—C8—C7A | 114.64 (10) | H20B—C20—H20C | 109.5 |
| C9—C8—C7A | 93.72 (9) | O6—C21—O7 | 123.89 (11) |
| O4—C8—H8A | 111.9 | O6—C21—C10 | 127.16 (11) |
| C9—C8—H8A | 111.9 | O7—C21—C10 | 108.90 (10) |
| C7A—C8—H8A | 111.9 | O7—C22—H22A | 109.5 |
| O13—C9—C8 | 104.88 (9) | O7—C22—H22B | 109.5 |
| O13—C9—C10 | 104.91 (9) | H22A—C22—H22B | 109.5 |
| C8—C9—C10 | 100.21 (9) | O7—C22—H22C | 109.5 |
| O13—C9—H9A | 115.1 | H22A—C22—H22C | 109.5 |
| C8—C9—H9A | 115.1 | H22B—C22—H22C | 109.5 |
| C10—C9—H9A | 115.1 | H9B—O9—H9C | 102.6 |
| C12A—C1—C2—C3 | −0.36 (19) | O13—C9—C10—C21 | −58.89 (11) |
| C1—C2—C3—C4 | −1.20 (19) | C8—C9—C10—C21 | −167.43 (9) |
| C2—C3—C4—C4A | 1.69 (19) | O13—C9—C10—C10A | 66.63 (10) |
| C3—C4—C4A—C12A | −0.60 (19) | C8—C9—C10—C10A | −41.91 (10) |
| C3—C4—C4A—C5 | 175.67 (11) | C7—C7A—C10A—C11 | 56.86 (12) |
| C13—N1—C5—C4A | −139.61 (12) | C8—C7A—C10A—C11 | 161.69 (9) |
| C16—N1—C5—C4A | 48.66 (15) | C7—C7A—C10A—C10 | −72.93 (10) |
| C13—N1—C5—C6 | 92.85 (14) | C8—C7A—C10A—C10 | 31.90 (11) |
| C16—N1—C5—C6 | −78.88 (14) | C21—C10—C10A—C11 | −3.21 (15) |
| C4—C4A—C5—N1 | 54.92 (14) | C9—C10—C10A—C11 | −121.72 (11) |
| C12A—C4A—C5—N1 | −128.96 (12) | C21—C10—C10A—C7A | 124.30 (11) |
| C4—C4A—C5—C6 | −178.01 (11) | C9—C10—C10A—C7A | 5.79 (11) |
| C12A—C4A—C5—C6 | −1.89 (16) | C12A—N12—C11—O8 | −6.56 (18) |
| N1—C5—C6—C6A | 162.65 (10) | C6A—N12—C11—O8 | 164.24 (11) |
| C4A—C5—C6—C6A | 36.59 (13) | C12A—N12—C11—C10A | 168.47 (10) |
| C11—N12—C6A—C7 | 19.28 (15) | C6A—N12—C11—C10A | −20.73 (16) |
| C12A—N12—C6A—C7 | −169.04 (9) | C7A—C10A—C11—O8 | 155.03 (11) |
| C11—N12—C6A—C6 | −108.25 (12) | C10—C10A—C11—O8 | −82.73 (14) |
| C12A—N12—C6A—C6 | 63.42 (12) | C7A—C10A—C11—N12 | −20.19 (14) |
| C5—C6—C6A—N12 | −67.46 (11) | C10—C10A—C11—N12 | 102.05 (12) |
| C5—C6—C6A—C7 | 165.21 (9) | C4—C4A—C12A—C1 | −0.99 (17) |
| C9—O13—C7—O2 | −114.71 (9) | C5—C4A—C12A—C1 | −177.11 (11) |
| C9—O13—C7—C6A | 132.01 (10) | C4—C4A—C12A—N12 | 171.70 (11) |
| C9—O13—C7—C7A | 7.26 (11) | C5—C4A—C12A—N12 | −4.43 (17) |
| C17—O2—C7—O13 | 164.37 (9) | C2—C1—C12A—C4A | 1.46 (18) |
| C17—O2—C7—C6A | −76.61 (12) | C2—C1—C12A—N12 | −171.09 (11) |
| C17—O2—C7—C7A | 52.24 (14) | C11—N12—C12A—C4A | 145.01 (11) |
| N12—C6A—C7—O13 | −95.04 (11) | C6A—N12—C12A—C4A | −26.74 (15) |
| C6—C6A—C7—O13 | 29.09 (13) | C11—N12—C12A—C1 | −42.35 (16) |
| N12—C6A—C7—O2 | 154.10 (9) | C6A—N12—C12A—C1 | 145.90 (11) |
| C6—C6A—C7—O2 | −81.77 (11) | C5—N1—C13—O1 | 2.9 (2) |
| N12—C6A—C7—C7A | 23.68 (13) | C16—N1—C13—O1 | 175.47 (12) |
| C6—C6A—C7—C7A | 147.81 (10) | C5—N1—C13—C14 | −176.14 (11) |
| O13—C7—C7A—C8 | −37.81 (11) | C16—N1—C13—C14 | −3.56 (15) |
| O2—C7—C7A—C8 | 73.31 (11) | O1—C13—C14—C15 | 163.23 (13) |
| C6A—C7—C7A—C8 | −162.07 (9) | N1—C13—C14—C15 | −17.77 (14) |
| O13—C7—C7A—C10A | 66.17 (10) | C13—C14—C15—C16 | 30.76 (13) |
| O2—C7—C7A—C10A | 177.28 (9) | C13—N1—C16—C15 | 23.13 (14) |
| C6A—C7—C7A—C10A | −58.10 (12) | C5—N1—C16—C15 | −164.46 (11) |
| C19—O4—C8—C9 | 172.25 (10) | C14—C15—C16—N1 | −32.34 (13) |
| C19—O4—C8—C7A | −82.75 (12) | C7—O2—C17—O3 | −0.49 (17) |
| C7—C7A—C8—O4 | −65.65 (12) | C7—O2—C17—C18 | −179.47 (10) |
| C10A—C7A—C8—O4 | −172.64 (9) | C8—O4—C19—O5 | −4.77 (17) |
| C7—C7A—C8—C9 | 50.22 (10) | C8—O4—C19—C20 | 174.69 (10) |
| C10A—C7A—C8—C9 | −56.77 (10) | C22—O7—C21—O6 | −0.42 (18) |
| C7—O13—C9—C8 | 26.28 (11) | C22—O7—C21—C10 | 177.16 (10) |
| C7—O13—C9—C10 | −78.82 (10) | C9—C10—C21—O6 | 99.42 (14) |
| O4—C8—C9—O13 | 71.45 (11) | C10A—C10—C21—O6 | −14.78 (18) |
| C7A—C8—C9—O13 | −46.92 (10) | C9—C10—C21—O7 | −78.07 (12) |
| O4—C8—C9—C10 | −179.98 (9) | C10A—C10—C21—O7 | 167.73 (10) |
| C7A—C8—C9—C10 | 61.65 (10) |
| D—H···A | D—H | H···A | D···A | D—H···A |
| O9—H9B···O3i | 0.89 | 1.98 | 2.8576 (12) | 173 |
| O9—H9C···O8 | 0.86 | 1.98 | 2.8365 (13) | 177 |
| O10—H10C···O1 | 0.91 | 2.06 | 2.9516 (15) | 167 |
| Symmetry codes: (i) x+1/2, y+1/2, z. |
| D—H···A | D—H | H···A | D···A | D—H···A |
| O9—H9B···O3i | 0.89 | 1.98 | 2.8576 (12) | 173 |
| O9—H9C···O8 | 0.86 | 1.98 | 2.8365 (13) | 177 |
| O10—H10C···O1 | 0.91 | 2.06 | 2.9516 (15) | 167 |
| Symmetry codes: (i) x+1/2, y+1/2, z. |
We thank Professor Abel M. Maharramov for fruitful discussions and help in this work.
Allen, F. H., Baalham, C. A., Lommerse, J. P. M. & Raithby, P. R. (1998). Acta Cryst. B54, 320–329.
Bruker (2001). SAINT-Plus. Bruker AXS Inc., Madison, Wisconsin, USA.
Bruker (2005). APEX2. Bruker AXS Inc., Madison, Wisconsin, USA.
Gurbanov, A. V., Nikitina, E. V., Airiyan, I. K., Zaytsev, V. P. & Khrustalev, V. N. (2009). Acta Cryst. E65, o2981.
Hanson, J. R. (1991). Comp. Org. Synth. 3, 705–719.
Hogeveen, H. & Van Krutchten, E. M. G. A. (1979). Top. Curr. Chem. 80, 89–124.
Jung, M. E. & Street, L. J. (1985). Tetrahedron Lett. 26, 3639–3642.
Keay, B. A., Rogers, C. & Bontront, J.-L. J. (1989). J. Chem. Soc. Chem. Commun. pp. 1782–1784.
Popp, F. D. & McEwen, W. E. (1958). Chem. Rev. 58, 321–401.
Sheldrick, G. M. (2003). SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122.
Zubkov, F. I., Ershova, J. D., Orlova, A. A., Zaytsev, V. P., Nikitina, E. V., Peregudov, A. S., Gurbanov, A. V., Borisov, R. S., Khrustalev, V. N., Maharramov, A. M. & Varlamov, A. V. (2009). Tetrahedron, 65, 3789–3803.
Zubkov, F. I., Nikitina, E. V., Turchin, K. F., Aleksandrov, G. G., Safronova, A. A., Borisov, R. S. & Varlamov, A. V. (2004). J. Org. Chem. 69, 432–438.
Zubkov, F. I., Zaitsev, V. P., Peregudov, A. S., Mikhailova, N. M. & Varlamov, A. V. (2007). Russ. Chem. Bull. Int. Ed. 56, 1063–1079.
Acid catalyzed Wagner-Meerwein rearrangement of substituted 3,8-dioxatricyclo[3.2.1.02,4]octanes (epoxy-7-oxabicyclo[2.2.1]heptenes) is used extensively in organic synthesis (Popp & McEwen,1958; Hogeveen & Van Krutchten, 1979; Hanson, 1991). However, with the exception of our works (Zubkov et al. 2004; Zubkov et al. 2009; Gurbanov et al. 2009), only a few examples of the skeletal rearrangement for 7-oxabicyclo[2.2.1]heptenes condensed with nitrogen-rings are known to date (Jung & Street, 1985; Keay et al. 1989). In particular, Wagner-Meerwein rearrangement in isoindolo[2,1-a]quinolines series has not been studied yet. The present work is meant to cover this gap. Hereunder, we report a new diastereoselective approach to 7,8-bis(acetyloxy)-5-R-7,9-epoxycyclopenta[4,5]pyrido[1,2-a]quinolines using 2-furyltetrahydroquinolines, readily accessible by Povarov reaction, as starting compounds (Zubkov et al. (2007)).
The structure of methyl 7,8-bis(acetyloxy)-11-oxo-5-(N-pyrrolidonyl)-7,9-epoxycyclopenta[4,5]pyrido[1,2-a]quinoline-10-carboxylate (I) was established by X-ray diffraction study (Fig. 1). Compound (I) crystallizes as sesquihydrate, i. e., C26H28N2O9.1.5H2O; one of the two independent water molecules occupies a special position on the twofold axis. Molecule of (I) comprises a fused pentacyclic system containing two five-membered rings (cyclopentane and tetrahydrofuran) and three six-membered rings (piperidinone, tetrahydropyridine and benzene). Both five-membered rings of the bicyclic fragment have usual envelope conformations, and the central six-membered piperidinone and tetrahydropyridine rings adopt the boat and sofa conformations, respectively. The nitrogen N12 atom has a trigonal-planar geometry (sum of the bond angles is 359.5°). The dihedral angle between the planes of the piperidinone (or rather "bottom of the boat" C6A, C7, C10A, C11 plane) and benzene is 38.81 (3)°. The two carboxylate substituents at the C7 and C8 carbon atoms are in the sterically unfavorable syn-periplanar configuration relative to the tetrahydrofuran ring. Such disposition is explained by the direction of the Wagner-Meerwein rearrangement.
The pyrrolidinone ligand and carboxylate substituent at the C10 atom are on the same side of the core pentacyclic framework. It is noteworthy that these fragments are engaged in the attractive intermolecular carbonyl-carbonyl interactions C13═O1···C17i═ O3i and C19═O5···C11ii═ O8ii [O1···C17i 2.947 (1) Å, O5···C11ii 2.993 (1) Å; symmetry codes: (i) -x, y, 1/2 - z; (ii) -x, 1 - y, 1 - z]. Carbonyl-carbonyl interactions of such type were investigated in substantial detail by Allen et al. (1998).
The molecule of (I) possesses eight asymmetric centers at the C5, C6A, C7, C7A, C8, C9, C10 and C10A atoms and can have potentially numerous diastereomers. The crystal of (I) is racemic and consists of enantiomeric pairs with the following relative configuration of the centers: rac-5S*,6aS*,7R*,7aR*,8R*,9S*,10S*,10aR*.
There are three independent H-bonds (Table 1), which link the molecules of (I) and water molecules into complex two-tier layers parallel to (001) (Fig. 2). The layers are linked further into three-dimensional framework by the above-mentioned attractive intermolecular carbonyl-carbonyl interactions.