Experimental
Crystal data
C27H43NO2 Mr = 413.62 Orthorhombic, P 21 21 21 a = 12.5887 (16) Å b = 13.2550 (11) Å c = 14.5355 (12) Å V = 2425.4 (4) Å3 Z = 4 Cu Kα radiation μ = 0.53 mm−1 T = 293 K 0.40 × 0.22 × 0.13 mm
|
Data collection
Kuma Diffraction KM-4 diffractometer Absorption correction: none 4994 measured reflections 2610 independent reflections 2240 reflections with I > 2σ(I) Rint = 0.037 3 standard reflections every 100 reflections intensity decay: 2.3%
|
D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A | O1—H1⋯O2i | 0.87 (3) | 1.93 (3) | 2.782 (2) | 164 (3) | Symmetry code: (i) . | |
Data collection: KM-4 Software (Kuma Diffraction, 1996
); cell refinement: KM-4 Software; data reduction: KM-4 Software; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008
); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008
); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997
); software used to prepare material for publication: WinGX (Farrugia, 1999
).
Supporting information
The title compound was obtained according to the procedure described by Medvedeva et al. (2004). Single colourless needle-crystals suitable for analysis were grown from ethanol by slow evaporation at room temperature.
All the hydrogens were discernible in the difference electron density map. Except for the hydroxyl H atom that was refined freely the remaining hydrogens were situated into the idealized positions and were refined within the riding model approximation: Cmethyl—H = 0.96, Cmethylene—H 0.97, Cmethine= 0.98 Å. Uiso(H) = 1.2 UeqCmethylene/Cmethine; Uiso(H) = 1.5Ueq(Cmethyl). The methyl group was allowed to rotate during refinement. The absolute configuration of the title structure is known by reference to the known chirality of the enantiopure allobetulin employed as the initial reagent used in the synthesis as well as to the chirality of the other oleanane derivatives [see: CSD, Cambridge; Allen (2002)].
Data collection: KM-4 Software (Kuma Diffraction, 1996); cell refinement: KM-4 Software (Kuma Diffraction, 1996); data reduction: KM-4 Software (Kuma Diffraction, 1996); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).
(3
E,3a
S,5a
R,5b
R,7a
R,11
R,11a
R, 11b
R,13a
R,13b
R)-5a,5b,10,10,13b- pentamethylicosahydro-1
H-11,7a- (epoxymethano)cyclopenta[
a]chrysen-3-one oxime
top Crystal data top C27H43NO2 | Dx = 1.133 Mg m−3 |
Mr = 413.62 | Melting point = 468–470 K |
Orthorhombic, P212121 | Cu Kα radiation, λ = 1.54178 Å |
Hall symbol: P 2ac 2ab | Cell parameters from 54 reflections |
a = 12.5887 (16) Å | θ = 14.5–28.5° |
b = 13.2550 (11) Å | µ = 0.53 mm−1 |
c = 14.5355 (12) Å | T = 293 K |
V = 2425.4 (4) Å3 | Needle, colourless |
Z = 4 | 0.40 × 0.22 × 0.13 mm |
F(000) = 912 | |
Data collection top Kuma Diffraction KM-4 diffractometer | Rint = 0.037 |
Radiation source: fine-focus sealed tube | θmax = 70.1°, θmin = 4.5° |
Graphite monochromator | h = −15→15 |
ω/2θ scans | k = 0→16 |
4994 measured reflections | l = 0→17 |
2610 independent reflections | 3 standard reflections every 100 reflections |
2240 reflections with I > 2σ(I) | intensity decay: 2.3% |
Refinement top Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.031 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.094 | w = 1/[σ2(Fo2) + (0.0523P)2 + 0.1689P] where P = (Fo2 + 2Fc2)/3 |
S = 1.06 | (Δ/σ)max < 0.001 |
2610 reflections | Δρmax = 0.12 e Å−3 |
281 parameters | Δρmin = −0.12 e Å−3 |
0 restraints | Extinction correction: SHELXL, Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
163 constraints | Extinction coefficient: 0.0011 (2) |
Primary atom site location: structure-invariant direct methods | |
Crystal data top C27H43NO2 | V = 2425.4 (4) Å3 |
Mr = 413.62 | Z = 4 |
Orthorhombic, P212121 | Cu Kα radiation |
a = 12.5887 (16) Å | µ = 0.53 mm−1 |
b = 13.2550 (11) Å | T = 293 K |
c = 14.5355 (12) Å | 0.40 × 0.22 × 0.13 mm |
Data collection top Kuma Diffraction KM-4 diffractometer | Rint = 0.037 |
4994 measured reflections | 3 standard reflections every 100 reflections |
2610 independent reflections | intensity decay: 2.3% |
2240 reflections with I > 2σ(I) | |
Refinement top R[F2 > 2σ(F2)] = 0.031 | 0 restraints |
wR(F2) = 0.094 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.06 | Δρmax = 0.12 e Å−3 |
2610 reflections | Δρmin = −0.12 e Å−3 |
281 parameters | |
Special details top 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. |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top | x | y | z | Uiso*/Ueq | |
O1 | 0.50319 (13) | 0.77700 (17) | 0.33765 (13) | 0.0806 (5) | |
H1 | 0.491 (2) | 0.762 (2) | 0.395 (2) | 0.100 (10)* | |
O2 | 0.06258 (10) | 1.29692 (10) | 0.00744 (9) | 0.0561 (3) | |
N1 | 0.40209 (14) | 0.75851 (15) | 0.29992 (12) | 0.0620 (5) | |
C1 | 0.43803 (18) | 0.79829 (17) | 0.05510 (15) | 0.0631 (5) | |
H1A | 0.4512 | 0.7343 | 0.0248 | 0.076* | |
H1B | 0.4666 | 0.8519 | 0.0170 | 0.076* | |
C2 | 0.49002 (17) | 0.7997 (2) | 0.15037 (16) | 0.0680 (6) | |
H2A | 0.5484 | 0.7521 | 0.1537 | 0.082* | |
H2B | 0.5162 | 0.8666 | 0.1654 | 0.082* | |
C3 | 0.40138 (16) | 0.76952 (16) | 0.21323 (14) | 0.0561 (5) | |
C5 | 0.30026 (17) | 0.75334 (15) | 0.16039 (14) | 0.0576 (5) | |
H5 | 0.2966 | 0.6817 | 0.1441 | 0.069* | |
C6 | 0.19970 (17) | 0.77938 (18) | 0.21268 (15) | 0.0658 (6) | |
H6A | 0.1384 | 0.7587 | 0.1769 | 0.079* | |
H6B | 0.1985 | 0.7425 | 0.2703 | 0.079* | |
C7 | 0.19268 (16) | 0.89107 (17) | 0.23218 (13) | 0.0591 (5) | |
H7A | 0.2513 | 0.9103 | 0.2718 | 0.071* | |
H7B | 0.1272 | 0.9046 | 0.2652 | 0.071* | |
C8 | 0.19556 (13) | 0.95683 (15) | 0.14448 (11) | 0.0455 (4) | |
C9 | 0.29594 (14) | 0.92829 (13) | 0.08732 (11) | 0.0427 (4) | |
H9 | 0.3562 | 0.9514 | 0.1245 | 0.051* | |
C10 | 0.31736 (16) | 0.81371 (14) | 0.07022 (13) | 0.0526 (4) | |
C11 | 0.30140 (16) | 0.99102 (13) | −0.00084 (11) | 0.0475 (4) | |
H11A | 0.3657 | 0.9740 | −0.0341 | 0.057* | |
H11B | 0.2413 | 0.9743 | −0.0397 | 0.057* | |
C12 | 0.30058 (14) | 1.10370 (13) | 0.01892 (12) | 0.0457 (4) | |
H12A | 0.2966 | 1.1402 | −0.0388 | 0.055* | |
H12B | 0.3667 | 1.1221 | 0.0488 | 0.055* | |
C13 | 0.20788 (13) | 1.13561 (13) | 0.08002 (11) | 0.0415 (4) | |
H13 | 0.1426 | 1.1200 | 0.0462 | 0.050* | |
C14 | 0.20485 (13) | 1.07304 (15) | 0.17054 (10) | 0.0456 (4) | |
C15 | 0.10814 (16) | 1.10874 (19) | 0.22730 (13) | 0.0629 (6) | |
H15A | 0.0437 | 1.0922 | 0.1940 | 0.075* | |
H15B | 0.1067 | 1.0722 | 0.2851 | 0.075* | |
C16 | 0.10920 (18) | 1.2219 (2) | 0.24743 (13) | 0.0690 (6) | |
H16A | 0.0434 | 1.2399 | 0.2781 | 0.083* | |
H16B | 0.1671 | 1.2365 | 0.2894 | 0.083* | |
C17 | 0.12164 (15) | 1.28729 (17) | 0.16219 (13) | 0.0558 (5) | |
C18 | 0.20859 (14) | 1.24982 (14) | 0.09614 (12) | 0.0476 (4) | |
H18 | 0.2786 | 1.2714 | 0.1180 | 0.057* | |
C19 | 0.17728 (14) | 1.31005 (14) | 0.01104 (14) | 0.0503 (4) | |
H19 | 0.2103 | 1.2809 | −0.0439 | 0.060* | |
C20 | 0.20282 (19) | 1.42351 (16) | 0.01733 (18) | 0.0691 (6) | |
C21 | 0.1451 (2) | 1.46632 (19) | 0.1015 (2) | 0.0814 (8) | |
H21A | 0.1774 | 1.5304 | 0.1177 | 0.098* | |
H21B | 0.0718 | 1.4794 | 0.0849 | 0.098* | |
C22 | 0.14688 (19) | 1.3980 (2) | 0.18554 (18) | 0.0773 (7) | |
H22A | 0.0954 | 1.4224 | 0.2299 | 0.093* | |
H22B | 0.2165 | 1.4016 | 0.2139 | 0.093* | |
C25 | 0.2534 (2) | 0.76839 (18) | −0.00933 (16) | 0.0742 (7) | |
H25A | 0.2774 | 0.7008 | −0.0209 | 0.111* | |
H25B | 0.2634 | 0.8086 | −0.0636 | 0.111* | |
H25C | 0.1794 | 0.7673 | 0.0066 | 0.111* | |
C26 | 0.09170 (15) | 0.93677 (17) | 0.09073 (15) | 0.0596 (5) | |
H26A | 0.0862 | 0.8661 | 0.0770 | 0.089* | |
H26B | 0.0924 | 0.9746 | 0.0344 | 0.089* | |
H26C | 0.0320 | 0.9572 | 0.1274 | 0.089* | |
C27 | 0.30490 (15) | 1.09487 (17) | 0.22921 (12) | 0.0561 (5) | |
H27A | 0.3666 | 1.0694 | 0.1981 | 0.084* | |
H27B | 0.2981 | 1.0624 | 0.2879 | 0.084* | |
H27C | 0.3120 | 1.1663 | 0.2380 | 0.084* | |
C28 | 0.02439 (14) | 1.28226 (19) | 0.09950 (14) | 0.0597 (5) | |
H28A | −0.0103 | 1.2172 | 0.1051 | 0.072* | |
H28B | −0.0261 | 1.3346 | 0.1157 | 0.072* | |
C29 | 0.3229 (2) | 1.43864 (18) | 0.0252 (2) | 0.0896 (9) | |
H29A | 0.3395 | 1.5088 | 0.0175 | 0.134* | |
H29B | 0.3581 | 1.4000 | −0.0216 | 0.134* | |
H29C | 0.3465 | 1.4166 | 0.0847 | 0.134* | |
C30 | 0.1626 (2) | 1.47527 (18) | −0.0701 (2) | 0.0876 (8) | |
H30A | 0.1719 | 1.5469 | −0.0646 | 0.131* | |
H30B | 0.0886 | 1.4603 | −0.0784 | 0.131* | |
H30C | 0.2020 | 1.4510 | −0.1222 | 0.131* | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
O1 | 0.0541 (8) | 0.1201 (15) | 0.0675 (10) | 0.0019 (9) | −0.0063 (8) | 0.0231 (10) |
O2 | 0.0432 (6) | 0.0761 (8) | 0.0490 (7) | 0.0101 (6) | −0.0029 (5) | −0.0061 (7) |
N1 | 0.0510 (9) | 0.0778 (12) | 0.0573 (9) | 0.0013 (8) | −0.0003 (8) | 0.0150 (9) |
C1 | 0.0741 (13) | 0.0589 (11) | 0.0564 (11) | 0.0148 (11) | 0.0171 (10) | 0.0079 (9) |
C2 | 0.0541 (11) | 0.0841 (15) | 0.0657 (13) | 0.0125 (11) | 0.0103 (10) | 0.0207 (11) |
C3 | 0.0550 (11) | 0.0573 (11) | 0.0558 (11) | 0.0022 (9) | 0.0036 (9) | 0.0129 (9) |
C5 | 0.0644 (11) | 0.0537 (10) | 0.0547 (10) | −0.0088 (9) | −0.0001 (10) | 0.0128 (9) |
C6 | 0.0531 (11) | 0.0814 (14) | 0.0629 (12) | −0.0158 (11) | 0.0009 (10) | 0.0286 (11) |
C7 | 0.0456 (9) | 0.0859 (14) | 0.0458 (9) | 0.0003 (10) | 0.0111 (8) | 0.0187 (9) |
C8 | 0.0357 (8) | 0.0656 (11) | 0.0354 (8) | −0.0061 (8) | 0.0018 (7) | 0.0076 (7) |
C9 | 0.0423 (8) | 0.0524 (9) | 0.0333 (7) | −0.0045 (7) | 0.0039 (7) | 0.0028 (7) |
C10 | 0.0635 (11) | 0.0504 (9) | 0.0440 (9) | −0.0045 (9) | 0.0029 (9) | 0.0037 (8) |
C11 | 0.0561 (10) | 0.0525 (9) | 0.0341 (8) | 0.0009 (8) | 0.0106 (8) | 0.0016 (7) |
C12 | 0.0455 (8) | 0.0504 (9) | 0.0413 (8) | 0.0016 (8) | 0.0123 (8) | 0.0026 (7) |
C13 | 0.0346 (7) | 0.0561 (9) | 0.0337 (7) | 0.0005 (7) | 0.0040 (7) | −0.0027 (7) |
C14 | 0.0352 (8) | 0.0693 (11) | 0.0324 (7) | 0.0020 (8) | 0.0033 (7) | −0.0014 (7) |
C15 | 0.0471 (10) | 0.1020 (17) | 0.0395 (9) | 0.0119 (10) | 0.0126 (8) | 0.0045 (10) |
C16 | 0.0566 (11) | 0.1094 (18) | 0.0408 (9) | 0.0257 (12) | 0.0037 (9) | −0.0167 (11) |
C17 | 0.0433 (9) | 0.0761 (13) | 0.0481 (10) | 0.0139 (9) | −0.0016 (8) | −0.0173 (10) |
C18 | 0.0354 (8) | 0.0603 (11) | 0.0472 (9) | 0.0046 (7) | 0.0007 (8) | −0.0105 (8) |
C19 | 0.0428 (9) | 0.0542 (9) | 0.0539 (10) | 0.0089 (7) | 0.0016 (8) | −0.0039 (8) |
C20 | 0.0627 (12) | 0.0550 (11) | 0.0897 (15) | 0.0113 (10) | 0.0011 (13) | −0.0083 (11) |
C21 | 0.0754 (15) | 0.0661 (14) | 0.103 (2) | 0.0176 (12) | −0.0056 (14) | −0.0248 (14) |
C22 | 0.0650 (13) | 0.0908 (17) | 0.0761 (15) | 0.0210 (12) | −0.0096 (12) | −0.0400 (14) |
C25 | 0.1048 (18) | 0.0607 (14) | 0.0572 (12) | −0.0073 (12) | −0.0101 (13) | −0.0062 (11) |
C26 | 0.0426 (9) | 0.0751 (13) | 0.0609 (11) | −0.0125 (9) | −0.0076 (9) | 0.0090 (11) |
C27 | 0.0492 (10) | 0.0764 (13) | 0.0427 (9) | 0.0034 (10) | −0.0086 (8) | −0.0082 (9) |
C28 | 0.0413 (9) | 0.0864 (14) | 0.0514 (10) | 0.0148 (10) | 0.0010 (8) | −0.0128 (10) |
C29 | 0.0691 (14) | 0.0581 (12) | 0.142 (3) | −0.0061 (11) | 0.0053 (17) | −0.0063 (15) |
C30 | 0.1021 (19) | 0.0549 (12) | 0.106 (2) | 0.0156 (13) | −0.0037 (17) | 0.0115 (13) |
Geometric parameters (Å, º) top O1—N1 | 1.407 (2) | C14—C27 | 1.548 (2) |
O1—H1 | 0.88 (3) | C15—C16 | 1.529 (4) |
O2—C28 | 1.435 (2) | C15—H15A | 0.9700 |
O2—C19 | 1.455 (2) | C15—H15B | 0.9700 |
N1—C3 | 1.268 (3) | C16—C17 | 1.520 (3) |
C1—C2 | 1.532 (3) | C16—H16A | 0.9700 |
C1—C10 | 1.548 (3) | C16—H16B | 0.9700 |
C1—H1A | 0.9700 | C17—C28 | 1.528 (3) |
C1—H1B | 0.9700 | C17—C18 | 1.538 (2) |
C2—C3 | 1.497 (3) | C17—C22 | 1.540 (3) |
C2—H2A | 0.9700 | C18—C19 | 1.524 (3) |
C2—H2B | 0.9700 | C18—H18 | 0.9800 |
C3—C5 | 1.502 (3) | C19—C20 | 1.541 (3) |
C5—C6 | 1.516 (3) | C19—H19 | 0.9800 |
C5—C10 | 1.551 (3) | C20—C29 | 1.529 (3) |
C5—H5 | 0.9800 | C20—C30 | 1.531 (4) |
C6—C7 | 1.510 (3) | C20—C21 | 1.532 (3) |
C6—H6A | 0.9700 | C21—C22 | 1.520 (4) |
C6—H6B | 0.9700 | C21—H21A | 0.9700 |
C7—C8 | 1.545 (2) | C21—H21B | 0.9700 |
C7—H7A | 0.9700 | C22—H22A | 0.9700 |
C7—H7B | 0.9700 | C22—H22B | 0.9700 |
C8—C26 | 1.546 (2) | C25—H25A | 0.9600 |
C8—C9 | 1.559 (2) | C25—H25B | 0.9600 |
C8—C14 | 1.591 (3) | C25—H25C | 0.9600 |
C9—C11 | 1.529 (2) | C26—H26A | 0.9600 |
C9—C10 | 1.562 (3) | C26—H26B | 0.9600 |
C9—H9 | 0.9800 | C26—H26C | 0.9600 |
C10—C25 | 1.532 (3) | C27—H27A | 0.9600 |
C11—C12 | 1.521 (2) | C27—H27B | 0.9600 |
C11—H11A | 0.9700 | C27—H27C | 0.9600 |
C11—H11B | 0.9700 | C28—H28A | 0.9700 |
C12—C13 | 1.526 (2) | C28—H28B | 0.9700 |
C12—H12A | 0.9700 | C29—H29A | 0.9600 |
C12—H12B | 0.9700 | C29—H29B | 0.9600 |
C13—C18 | 1.532 (2) | C29—H29C | 0.9600 |
C13—C14 | 1.556 (2) | C30—H30A | 0.9600 |
C13—H13 | 0.9800 | C30—H30B | 0.9600 |
C14—C15 | 1.545 (2) | C30—H30C | 0.9600 |
| | | |
N1—O1—H1 | 100 (2) | C16—C15—H15B | 108.9 |
C28—O2—C19 | 108.36 (14) | C14—C15—H15B | 108.9 |
C3—N1—O1 | 111.93 (18) | H15A—C15—H15B | 107.7 |
C2—C1—C10 | 106.80 (16) | C17—C16—C15 | 113.84 (16) |
C2—C1—H1A | 110.4 | C17—C16—H16A | 108.8 |
C10—C1—H1A | 110.4 | C15—C16—H16A | 108.8 |
C2—C1—H1B | 110.4 | C17—C16—H16B | 108.8 |
C10—C1—H1B | 110.4 | C15—C16—H16B | 108.8 |
H1A—C1—H1B | 108.6 | H16A—C16—H16B | 107.7 |
C3—C2—C1 | 103.30 (18) | C16—C17—C28 | 112.25 (19) |
C3—C2—H2A | 111.1 | C16—C17—C18 | 113.46 (16) |
C1—C2—H2A | 111.1 | C28—C17—C18 | 100.60 (14) |
C3—C2—H2B | 111.1 | C16—C17—C22 | 112.64 (18) |
C1—C2—H2B | 111.1 | C28—C17—C22 | 109.79 (18) |
H2A—C2—H2B | 109.1 | C18—C17—C22 | 107.37 (18) |
N1—C3—C2 | 129.2 (2) | C19—C18—C13 | 113.07 (14) |
N1—C3—C5 | 119.83 (19) | C19—C18—C17 | 98.82 (14) |
C2—C3—C5 | 110.97 (17) | C13—C18—C17 | 114.23 (16) |
C3—C5—C6 | 114.75 (17) | C19—C18—H18 | 110.1 |
C3—C5—C10 | 103.94 (16) | C13—C18—H18 | 110.1 |
C6—C5—C10 | 114.97 (17) | C17—C18—H18 | 110.1 |
C3—C5—H5 | 107.6 | O2—C19—C18 | 102.90 (15) |
C6—C5—H5 | 107.6 | O2—C19—C20 | 109.03 (15) |
C10—C5—H5 | 107.6 | C18—C19—C20 | 114.15 (17) |
C7—C6—C5 | 111.48 (16) | O2—C19—H19 | 110.2 |
C7—C6—H6A | 109.3 | C18—C19—H19 | 110.2 |
C5—C6—H6A | 109.3 | C20—C19—H19 | 110.2 |
C7—C6—H6B | 109.3 | C29—C20—C30 | 109.3 (2) |
C5—C6—H6B | 109.3 | C29—C20—C21 | 111.1 (2) |
H6A—C6—H6B | 108.0 | C30—C20—C21 | 109.90 (19) |
C6—C7—C8 | 113.39 (17) | C29—C20—C19 | 109.80 (17) |
C6—C7—H7A | 108.9 | C30—C20—C19 | 108.6 (2) |
C8—C7—H7A | 108.9 | C21—C20—C19 | 108.1 (2) |
C6—C7—H7B | 108.9 | C22—C21—C20 | 114.47 (19) |
C8—C7—H7B | 108.9 | C22—C21—H21A | 108.6 |
H7A—C7—H7B | 107.7 | C20—C21—H21A | 108.6 |
C7—C8—C26 | 107.47 (15) | C22—C21—H21B | 108.6 |
C7—C8—C9 | 108.78 (15) | C20—C21—H21B | 108.6 |
C26—C8—C9 | 111.99 (14) | H21A—C21—H21B | 107.6 |
C7—C8—C14 | 110.59 (15) | C21—C22—C17 | 112.79 (19) |
C26—C8—C14 | 110.43 (15) | C21—C22—H22A | 109.0 |
C9—C8—C14 | 107.59 (14) | C17—C22—H22A | 109.0 |
C11—C9—C8 | 110.56 (14) | C21—C22—H22B | 109.0 |
C11—C9—C10 | 112.80 (14) | C17—C22—H22B | 109.0 |
C8—C9—C10 | 117.42 (14) | H22A—C22—H22B | 107.8 |
C11—C9—H9 | 104.9 | C10—C25—H25A | 109.5 |
C8—C9—H9 | 104.9 | C10—C25—H25B | 109.5 |
C10—C9—H9 | 104.9 | H25A—C25—H25B | 109.5 |
C25—C10—C1 | 110.89 (19) | C10—C25—H25C | 109.5 |
C25—C10—C5 | 111.27 (16) | H25A—C25—H25C | 109.5 |
C1—C10—C5 | 100.84 (16) | H25B—C25—H25C | 109.5 |
C25—C10—C9 | 114.24 (17) | C8—C26—H26A | 109.5 |
C1—C10—C9 | 108.67 (16) | C8—C26—H26B | 109.5 |
C5—C10—C9 | 110.08 (15) | H26A—C26—H26B | 109.5 |
C12—C11—C9 | 112.05 (14) | C8—C26—H26C | 109.5 |
C12—C11—H11A | 109.2 | H26A—C26—H26C | 109.5 |
C9—C11—H11A | 109.2 | H26B—C26—H26C | 109.5 |
C12—C11—H11B | 109.2 | C14—C27—H27A | 109.5 |
C9—C11—H11B | 109.2 | C14—C27—H27B | 109.5 |
H11A—C11—H11B | 107.9 | H27A—C27—H27B | 109.5 |
C11—C12—C13 | 112.78 (14) | C14—C27—H27C | 109.5 |
C11—C12—H12A | 109.0 | H27A—C27—H27C | 109.5 |
C13—C12—H12A | 109.0 | H27B—C27—H27C | 109.5 |
C11—C12—H12B | 109.0 | O2—C28—C17 | 106.37 (15) |
C13—C12—H12B | 109.0 | O2—C28—H28A | 110.5 |
H12A—C12—H12B | 107.8 | C17—C28—H28A | 110.5 |
C12—C13—C18 | 111.00 (14) | O2—C28—H28B | 110.5 |
C12—C13—C14 | 111.29 (14) | C17—C28—H28B | 110.5 |
C18—C13—C14 | 113.42 (14) | H28A—C28—H28B | 108.6 |
C12—C13—H13 | 106.9 | C20—C29—H29A | 109.5 |
C18—C13—H13 | 106.9 | C20—C29—H29B | 109.5 |
C14—C13—H13 | 106.9 | H29A—C29—H29B | 109.5 |
C15—C14—C27 | 106.84 (14) | C20—C29—H29C | 109.5 |
C15—C14—C13 | 107.91 (15) | H29A—C29—H29C | 109.5 |
C27—C14—C13 | 110.26 (15) | H29B—C29—H29C | 109.5 |
C15—C14—C8 | 111.46 (16) | C20—C30—H30A | 109.5 |
C27—C14—C8 | 111.84 (15) | C20—C30—H30B | 109.5 |
C13—C14—C8 | 108.46 (13) | H30A—C30—H30B | 109.5 |
C16—C15—C14 | 113.33 (18) | C20—C30—H30C | 109.5 |
C16—C15—H15A | 108.9 | H30A—C30—H30C | 109.5 |
C14—C15—H15A | 108.9 | H30B—C30—H30C | 109.5 |
| | | |
C10—C1—C2—C3 | 24.3 (2) | C26—C8—C14—C15 | 57.27 (18) |
O1—N1—C3—C2 | −1.0 (4) | C9—C8—C14—C15 | 179.76 (13) |
O1—N1—C3—C5 | −179.80 (18) | C7—C8—C14—C27 | 57.97 (18) |
C1—C2—C3—N1 | 179.6 (2) | C26—C8—C14—C27 | 176.80 (14) |
C1—C2—C3—C5 | −1.5 (2) | C9—C8—C14—C27 | −60.70 (17) |
N1—C3—C5—C6 | 31.2 (3) | C7—C8—C14—C13 | 179.78 (14) |
C2—C3—C5—C6 | −147.80 (19) | C26—C8—C14—C13 | −61.40 (17) |
N1—C3—C5—C10 | 157.6 (2) | C9—C8—C14—C13 | 61.10 (16) |
C2—C3—C5—C10 | −21.4 (2) | C27—C14—C15—C16 | 62.1 (2) |
C3—C5—C6—C7 | 66.3 (2) | C13—C14—C15—C16 | −56.4 (2) |
C10—C5—C6—C7 | −54.2 (2) | C8—C14—C15—C16 | −175.40 (15) |
C5—C6—C7—C8 | 58.2 (2) | C14—C15—C16—C17 | 53.3 (2) |
C6—C7—C8—C26 | 67.6 (2) | C15—C16—C17—C28 | 68.0 (2) |
C6—C7—C8—C9 | −53.8 (2) | C15—C16—C17—C18 | −45.2 (2) |
C6—C7—C8—C14 | −171.76 (16) | C15—C16—C17—C22 | −167.46 (18) |
C7—C8—C9—C11 | 179.45 (15) | C12—C13—C18—C19 | 71.70 (19) |
C26—C8—C9—C11 | 60.81 (19) | C14—C13—C18—C19 | −162.14 (14) |
C14—C8—C9—C11 | −60.72 (17) | C12—C13—C18—C17 | −176.31 (14) |
C7—C8—C9—C10 | 48.1 (2) | C14—C13—C18—C17 | −50.1 (2) |
C26—C8—C9—C10 | −70.6 (2) | C16—C17—C18—C19 | 164.25 (17) |
C14—C8—C9—C10 | 167.91 (14) | C28—C17—C18—C19 | 44.17 (19) |
C2—C1—C10—C25 | −154.75 (18) | C22—C17—C18—C19 | −70.62 (18) |
C2—C1—C10—C5 | −36.8 (2) | C16—C17—C18—C13 | 43.9 (2) |
C2—C1—C10—C9 | 78.9 (2) | C28—C17—C18—C13 | −76.1 (2) |
C3—C5—C10—C25 | 152.20 (18) | C22—C17—C18—C13 | 169.06 (16) |
C6—C5—C10—C25 | −81.5 (2) | C28—O2—C19—C18 | 28.72 (19) |
C3—C5—C10—C1 | 34.5 (2) | C28—O2—C19—C20 | −92.8 (2) |
C6—C5—C10—C1 | 160.79 (18) | C13—C18—C19—O2 | 75.99 (17) |
C3—C5—C10—C9 | −80.1 (2) | C17—C18—C19—O2 | −45.17 (17) |
C6—C5—C10—C9 | 46.1 (2) | C13—C18—C19—C20 | −166.02 (16) |
C11—C9—C10—C25 | −48.7 (2) | C17—C18—C19—C20 | 72.81 (19) |
C8—C9—C10—C25 | 81.7 (2) | O2—C19—C20—C29 | 177.7 (2) |
C11—C9—C10—C1 | 75.7 (2) | C18—C19—C20—C29 | 63.3 (3) |
C8—C9—C10—C1 | −153.95 (15) | O2—C19—C20—C30 | −62.9 (2) |
C11—C9—C10—C5 | −174.71 (16) | C18—C19—C20—C30 | −177.28 (18) |
C8—C9—C10—C5 | −44.4 (2) | O2—C19—C20—C21 | 56.3 (2) |
C8—C9—C11—C12 | 56.7 (2) | C18—C19—C20—C21 | −58.1 (2) |
C10—C9—C11—C12 | −169.56 (16) | C29—C20—C21—C22 | −80.1 (3) |
C9—C11—C12—C13 | −52.8 (2) | C30—C20—C21—C22 | 158.8 (2) |
C11—C12—C13—C18 | −178.59 (15) | C19—C20—C21—C22 | 40.4 (3) |
C11—C12—C13—C14 | 54.06 (19) | C20—C21—C22—C17 | −45.1 (3) |
C12—C13—C14—C15 | −179.09 (15) | C16—C17—C22—C21 | −172.49 (18) |
C18—C13—C14—C15 | 54.9 (2) | C28—C17—C22—C21 | −46.6 (2) |
C12—C13—C14—C27 | 64.56 (18) | C18—C17—C22—C21 | 61.9 (2) |
C18—C13—C14—C27 | −61.45 (19) | C19—O2—C28—C17 | 0.2 (2) |
C12—C13—C14—C8 | −58.21 (17) | C16—C17—C28—O2 | −149.50 (17) |
C18—C13—C14—C8 | 175.78 (14) | C18—C17—C28—O2 | −28.6 (2) |
C7—C8—C14—C15 | −61.56 (19) | C22—C17—C28—O2 | 84.4 (2) |
Hydrogen-bond geometry (Å, º) top D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···O2i | 0.87 (3) | 1.93 (3) | 2.782 (2) | 164 (3) |
Symmetry code: (i) −x+1/2, −y+2, z+1/2. |
Experimental details
Crystal data |
Chemical formula | C27H43NO2 |
Mr | 413.62 |
Crystal system, space group | Orthorhombic, P212121 |
Temperature (K) | 293 |
a, b, c (Å) | 12.5887 (16), 13.2550 (11), 14.5355 (12) |
V (Å3) | 2425.4 (4) |
Z | 4 |
Radiation type | Cu Kα |
µ (mm−1) | 0.53 |
Crystal size (mm) | 0.40 × 0.22 × 0.13 |
|
Data collection |
Diffractometer | Kuma Diffraction KM-4 diffractometer |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 4994, 2610, 2240 |
Rint | 0.037 |
(sin θ/λ)max (Å−1) | 0.610 |
|
Refinement |
R[F2 > 2σ(F2)], wR(F2), S | 0.031, 0.094, 1.06 |
No. of reflections | 2610 |
No. of parameters | 281 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.12, −0.12 |
Hydrogen-bond geometry (Å, º) top D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···O2i | 0.87 (3) | 1.93 (3) | 2.782 (2) | 164 (3) |
Symmetry code: (i) −x+1/2, −y+2, z+1/2. |
References
Allen, F. H. (2002). Acta Cryst. B58, 380–388. Web of Science CrossRef CAS IUCr Journals Google Scholar
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One of the steps in our synthesis of the title compound, (E)-17β,19-epoxymethano-17,23,24-tridemethyl-4-nor-5β,18α-olean-3-one oxime (Scheme 1; Fig. 3 - (IV)), from allobetulin (Fig. 3 - (I)) involved ozonolysis of the intermediate δ-apoallobetulin, Fig. 3 - (II), to give 17β,19-epoxymethano-17,23,24-tridemethyl-4-nor-5β,18α-olean-3-one (Fig. 3 - (III)) as the transformation product with a cis-junction between the A/B rings. It should be mentioned that synthetic conversions to new derivatives with altered junction of A/B rings are rarely observed in triterpenoids of the oleanane group [Zaprutko (1995, 1997); Gzella et al. (1997); Gzella et al. (1998); Medvedeva et al. (2004)].
The X-ray structure determination of the title compound was carried out in order to confirm its spatial structure that had been proposed on the basis of spectroscopic data by Medvedeva et al. (2004).
The results obtained for the title compound confirm the cis-junction of A/B rings. The corresponding interplanar angle between the least-squares planes of the A/B rings is 71.85 (8)°. The H atom at the C5 asymmetric centre exhibits β-orientation and occupies a pseudo-axial position with respect to the A ring and an equatorial position to the B ring [the angles of the H5—C5 bond vector to the Cremer & Pople A and B ring plane normals are 9.60 (9) and 64.05 (7)°, respectively (Cremer & Pople, 1975; Spek, 2009)]. The torsion angle H5—C5—C10—C25 of 38° reveals a halfway conformation between synperiplanar and synclinal for bonds H5—C5 and C10—C25.
In the molecule the six-membered rings B–E of the pentacyclic ring system are trans-fused as in allobetuline. The dihedral angles between the least-squares planes of these rings are B/C 7.09 (10), C/D 0.80 (10), D/E 14.95 (9)°.
In the title structure, each of the six-membered rings B–E has a differently distorted chair conformation, whereas both five-membered rings, i.e. the carbocyclic ring A and the heterocyclic ring C17\C18\C19\O2\C28 including epoxymethylene group, assume envelope conformations. The respective puckering parameters (Cremer & Pople, 1975) are Q = 0.373 (2) Å, Φ = 147.1 (4)° and Q = 0.470 (2)Å, Φ = 253.2 (2)°.
The hydroximino function in C3 position has the E configuration. The value of the torsion angle O1—N1—C3—C5 is -179.80 (18)°.
The molecular packing is stabilized by O1—H···O2i hydrogen bonds (Tab. 1). The hydroxyl hydrogen is donated to the remote-ring epoxy O atom from the neighbour molecule. These hydrogen bonds link the molecules into helical chains which proceed in the c direction (Fig. 2).