organic compounds
Trichodermol (4α-hydroxy-12,13-epoxytrichothec-9-ene)
aCollege of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310029, People's Republic of China, and bInstitute of Biotechnology, Zhejiang University, Hangzhou 310029, People's Republic of China
*Correspondence e-mail: jinhaozhao@zju.edu.cn
In the title compound, C15H22O3, the five-membered ring displays an whereas the two six-membered rings show different conformations, viz. chair and half-chair. In the crystal, molecules are linked through intermolecular O—H⋯O hydrogen bonds, forming chains running along the b axis.
Related literature
For the fungicidal activity of the endophytic fungus Trichoderma taxi sp. nov. from Taxus mairei, see: Nielsen et al. (2005); Zhang et al. (2007). For the related Trichodermin structure, see: Chen et al. (2008). For the extinction correction, see: Larson (1970).
Experimental
Crystal data
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Refinement
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Data collection: PROCESS-AUTO (Rigaku, 1998); cell PROCESS-AUTO; data reduction: CrystalStructure (Rigaku/MSC, 2002); program(s) used to solve structure: SIR97 (Altomare et al., 1993); program(s) used to refine structure: CRYSTALS (Watkin et al., 1996); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999) and PLATON (Spek, 2009).
Supporting information
https://doi.org/10.1107/S1600536809044080/si2217sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536809044080/si2217Isup2.hkl
To a solution of 12,13-Epoxytrichothec-9-ene-4-one (1 g) in THF(100 ml) containing 10 ml of methanol was added sodium borohydride (100 mg) and the reactant was partitioned between 100 ml of ethyl acetate and water. The organic layer was dried with MgSO4 and concentrated, and the residue was chromatographed to give 620 mg solid precipitate. The solid was filtrated and recrystallized with 95% ethanol to colourless blocks.
[α]D = 65.7 (c 0.052). ESI-MS: 251 (M+H)+ (100%); 1H-NMR (500 MHz, CDCl3, ppm): 5.46 (1H, d, J=5.5Hz, H-10), 4.27 (1H, t, H-4), 4.22 (1H, d, J=5.5Hz, H-2), 3.67 (1H, d, J=5.5Hz, H-11), 3.05 (1H, d, J=4.0Hz, H-13), 2.78 (1H, d, J=4.0Hz, H-13), 2.56-2.49 (1H, m, H-3), 2.00-1.97 (2H, m, H-8), 1.97-1.96 (1H, m, H-3), 1.96-1.94 (1H, m, H-7), 1.71 (3H, s, H-16), 1.33-1.31 (1H, m, H-7), 1.09 (3H, s, H-14), 0.86 (3H, s, H-15).
In the absence of significant
effects, Friedel pairs were averaged; the was not determined. The H atoms were geometrically placed (C—H = 0.93–0.98 Å) and refined as riding with Uiso(H) = 1.2Ueq(C) or 1.5Ueq(methyl C). The methyl group was allowed to rotate, but not to tip, to best fit the electron density.The endophytic fungi Trichoderma taxi sp. nov. from Taxus mairei can produce a compound with fungicidal activity-Trichodermin (Zhang et al., 2007), which is a member of the 4β-aceoxy-12,13-epoxytrichothecene family (Nielsen et al., 2005). Bioassays showed Trichodermin strongly inhibited Rhizoctonia solani and Botrytis cinere. In order to find the relationship between the stereochemistry of the C4 position and biological activities, the title compound had been designed and synthesized. Its molecular structure is shown in Fig. 1. In the molecule, the five membered ring displays an with atom C11 at the flap position 0.715 (3) Å out of the mean plane formed by the other four atoms. The O1-containing six-membered ring displays a chair conformation. The typical C2=C3 double bond length of 1.325 (2) Å suggests that C2 and C3 atoms are sp2 hybridized, which correlates with the larger C1—C2—C3 bond angle of 124.36 (16) ° and C2—C3—C4 bond angle of 122.95 (18) ° and a small C1—C2—C3—C4 torsion angle of -3.0 (3) °, as compared to 3.0 (3) ° in the compound of Trichodermin. And the C3-containing six-membered ring displays a half-chair conformation, as well as the compound of Trichodermin (Chen et al.). There are intermolecular O—H···O hydrogen bonds (Table 1) in the which lead to the formation of chains running along the b axis (Fig. 2).
For the fungicidal activity of the endophytic fungus Trichoderma taxi sp. nov. from Taxus mairei, see: Nielsen et al. (2005); Zhang et al. (2007). For the related Trichodermin structure, see: Chen et al. (2008). For the extinction correction, see: Larson (1970).
Data collection: PROCESS-AUTO (Rigaku, 1998); cell
PROCESS-AUTO (Rigaku, 1998); data reduction: CrystalStructure (Rigaku/MSC, 2002); program(s) used to solve structure: SIR97 (Altomare et al., 1993); program(s) used to refine structure: CRYSTALS (Watkin et al., 1996); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999) and PLATON (Spek, 2009).C15H22O3 | F(000) = 272.00 |
Mr = 250.34 | Dx = 1.258 Mg m−3 |
Monoclinic, P21 | Mo Kα radiation, λ = 0.71075 Å |
Hall symbol: P 2yb | Cell parameters from 6124 reflections |
a = 6.8284 (2) Å | θ = 3.0–27.4° |
b = 6.6209 (3) Å | µ = 0.09 mm−1 |
c = 14.7170 (6) Å | T = 296 K |
β = 96.7507 (11)° | Chunk, colorless |
V = 660.74 (4) Å3 | 0.66 × 0.49 × 0.28 mm |
Z = 2 |
Rigaku R-AXIS RAPID IP diffractometer | 1540 reflections with F2 > 2σ(F2) |
Detector resolution: 10.00 pixels mm-1 | Rint = 0.018 |
ω scans | θmax = 27.4° |
Absorption correction: multi-scan (ABSCOR; Higashi, 1995) | h = −7→8 |
Tmin = 0.934, Tmax = 0.976 | k = −8→8 |
6503 measured reflections | l = −19→18 |
1634 independent reflections |
Refinement on F2 | w = 1/[0.0012Fo2 + 1.5σ(Fo2)]/(4Fo2) |
R[F2 > 2σ(F2)] = 0.034 | (Δ/σ)max < 0.001 |
wR(F2) = 0.095 | Δρmax = 0.17 e Å−3 |
S = 1.00 | Δρmin = −0.15 e Å−3 |
1634 reflections | Extinction correction: Larson (1970), equation 22 |
164 parameters | Extinction coefficient: 184 (28) |
H-atom parameters constrained |
C15H22O3 | V = 660.74 (4) Å3 |
Mr = 250.34 | Z = 2 |
Monoclinic, P21 | Mo Kα radiation |
a = 6.8284 (2) Å | µ = 0.09 mm−1 |
b = 6.6209 (3) Å | T = 296 K |
c = 14.7170 (6) Å | 0.66 × 0.49 × 0.28 mm |
β = 96.7507 (11)° |
Rigaku R-AXIS RAPID IP diffractometer | 1634 independent reflections |
Absorption correction: multi-scan (ABSCOR; Higashi, 1995) | 1540 reflections with F2 > 2σ(F2) |
Tmin = 0.934, Tmax = 0.976 | Rint = 0.018 |
6503 measured reflections |
R[F2 > 2σ(F2)] = 0.034 | 164 parameters |
wR(F2) = 0.095 | H-atom parameters constrained |
S = 1.00 | Δρmax = 0.17 e Å−3 |
1634 reflections | Δρmin = −0.15 e Å−3 |
Geometry. ENTER SPECIAL DETAILS OF THE MOLECULAR GEOMETRY |
Refinement. Refinement using all reflections. The weighted R-factor (wR) and goodness of fit (S) are based on F2. R-factor (gt) are based on F. The threshold expression of F2 > 2.0 σ(F2) is used only for calculating R-factor (gt). |
x | y | z | Uiso*/Ueq | ||
O1 | 0.84609 (16) | 0.3577 (2) | 0.83213 (8) | 0.0329 (3) | |
O2 | 0.9112 (2) | 0.9341 (2) | 0.83678 (11) | 0.0535 (4) | |
O3 | 0.44991 (17) | 0.5728 (2) | 0.95141 (8) | 0.0428 (3) | |
C1 | 0.8680 (2) | 0.4910 (2) | 0.75578 (11) | 0.0295 (4) | |
C2 | 0.9296 (2) | 0.3595 (3) | 0.68075 (12) | 0.0389 (4) | |
C3 | 0.8120 (2) | 0.3061 (3) | 0.60656 (12) | 0.0423 (5) | |
C4 | 0.5978 (2) | 0.3670 (3) | 0.59348 (12) | 0.0484 (5) | |
C5 | 0.5275 (2) | 0.4606 (3) | 0.67912 (12) | 0.0394 (4) | |
C6 | 0.6784 (2) | 0.6115 (2) | 0.72646 (11) | 0.0307 (4) | |
C7 | 0.6045 (2) | 0.7082 (2) | 0.81427 (11) | 0.0298 (4) | |
C8 | 0.7735 (2) | 0.8181 (2) | 0.87935 (12) | 0.0374 (4) | |
C9 | 0.8824 (2) | 0.6492 (3) | 0.93698 (12) | 0.0398 (4) | |
C10 | 0.7723 (2) | 0.4555 (3) | 0.90883 (11) | 0.0326 (4) | |
C11 | 0.5685 (2) | 0.5348 (2) | 0.87747 (11) | 0.0294 (4) | |
C12 | 0.3896 (2) | 0.4194 (3) | 0.88380 (12) | 0.0418 (5) | |
C13 | 0.8819 (4) | 0.1859 (4) | 0.52998 (14) | 0.0596 (6) | |
C14 | 0.7229 (3) | 0.7762 (3) | 0.65783 (14) | 0.0505 (5) | |
C15 | 0.4273 (2) | 0.8481 (3) | 0.79217 (14) | 0.0485 (5) | |
H1 | 0.9748 | 0.5866 | 0.7745 | 0.035* | |
H2 | 1.0589 | 0.3125 | 0.6868 | 0.047* | |
H8 | 0.7109 | 0.9068 | 0.9207 | 0.045* | |
H10 | 0.7711 | 0.3629 | 0.9607 | 0.039* | |
H41 | 0.5787 | 0.4649 | 0.5442 | 0.058* | |
H42 | 0.5188 | 0.2479 | 0.5769 | 0.058* | |
H51 | 0.4041 | 0.5308 | 0.6617 | 0.047* | |
H52 | 0.5066 | 0.3534 | 0.7219 | 0.047* | |
H91 | 1.0183 | 0.6401 | 0.9241 | 0.048* | |
H92 | 0.8794 | 0.6749 | 1.0017 | 0.048* | |
H121 | 0.3980 | 0.2778 | 0.9006 | 0.050* | |
H122 | 0.2745 | 0.4411 | 0.8396 | 0.050* | |
H131 | 0.8038 | 0.0656 | 0.5201 | 0.072* | |
H132 | 1.0178 | 0.1497 | 0.5458 | 0.072* | |
H133 | 0.8688 | 0.2656 | 0.4751 | 0.072* | |
H141 | 0.7607 | 0.7139 | 0.6036 | 0.061* | |
H142 | 0.8285 | 0.8602 | 0.6850 | 0.061* | |
H143 | 0.6072 | 0.8572 | 0.6421 | 0.061* | |
H151 | 0.3317 | 0.7839 | 0.7485 | 0.058* | |
H152 | 0.4697 | 0.9723 | 0.7670 | 0.058* | |
H153 | 0.3691 | 0.8760 | 0.8471 | 0.058* | |
H201 | 0.8723 | 1.0539 | 0.8294 | 0.066* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0392 (5) | 0.0274 (6) | 0.0324 (5) | 0.0083 (5) | 0.0063 (4) | −0.0003 (5) |
O2 | 0.0587 (8) | 0.0287 (7) | 0.0781 (10) | −0.0102 (7) | 0.0296 (7) | −0.0093 (7) |
O3 | 0.0493 (7) | 0.0455 (8) | 0.0377 (6) | 0.0024 (6) | 0.0226 (5) | −0.0016 (6) |
C1 | 0.0308 (7) | 0.0267 (9) | 0.0320 (7) | −0.0024 (6) | 0.0076 (5) | −0.0016 (6) |
C2 | 0.0398 (8) | 0.0335 (10) | 0.0466 (9) | −0.0012 (8) | 0.0179 (7) | −0.0075 (8) |
C3 | 0.0633 (10) | 0.0326 (10) | 0.0344 (9) | −0.0079 (9) | 0.0207 (8) | −0.0044 (8) |
C4 | 0.0632 (11) | 0.0501 (13) | 0.0308 (8) | −0.0053 (11) | 0.0004 (7) | −0.0065 (9) |
C5 | 0.0381 (7) | 0.0463 (12) | 0.0330 (8) | 0.0009 (8) | 0.0007 (6) | 0.0002 (9) |
C6 | 0.0386 (7) | 0.0272 (9) | 0.0273 (7) | 0.0021 (7) | 0.0083 (5) | 0.0025 (6) |
C7 | 0.0336 (7) | 0.0241 (8) | 0.0329 (8) | 0.0043 (6) | 0.0093 (5) | 0.0022 (7) |
C8 | 0.0424 (8) | 0.0303 (10) | 0.0419 (9) | −0.0012 (7) | 0.0153 (7) | −0.0106 (8) |
C9 | 0.0393 (8) | 0.0459 (11) | 0.0337 (8) | 0.0021 (8) | 0.0023 (6) | −0.0101 (8) |
C10 | 0.0383 (7) | 0.0342 (10) | 0.0254 (7) | 0.0076 (7) | 0.0049 (5) | 0.0043 (7) |
C11 | 0.0343 (7) | 0.0293 (9) | 0.0261 (7) | 0.0030 (7) | 0.0103 (5) | 0.0001 (7) |
C12 | 0.0393 (8) | 0.0427 (11) | 0.0455 (9) | −0.0034 (8) | 0.0145 (7) | 0.0013 (9) |
C13 | 0.0909 (15) | 0.0460 (13) | 0.0478 (11) | −0.0127 (13) | 0.0322 (11) | −0.0138 (11) |
C14 | 0.0785 (13) | 0.0354 (11) | 0.0413 (10) | 0.0041 (10) | 0.0229 (9) | 0.0086 (9) |
C15 | 0.0516 (9) | 0.0397 (12) | 0.0563 (11) | 0.0188 (10) | 0.0144 (8) | 0.0089 (10) |
O1—C1 | 1.450 (2) | C1—H1 | 0.980 |
O1—C10 | 1.443 (2) | C2—H2 | 0.930 |
O2—C8 | 1.416 (2) | C4—H41 | 0.970 |
O3—C11 | 1.453 (2) | C4—H42 | 0.970 |
O3—C12 | 1.447 (2) | C5—H51 | 0.970 |
C1—C2 | 1.504 (2) | C5—H52 | 0.970 |
C1—C6 | 1.539 (2) | C8—H8 | 0.980 |
C2—C3 | 1.325 (2) | C9—H91 | 0.970 |
C3—C4 | 1.508 (2) | C9—H92 | 0.970 |
C3—C13 | 1.503 (3) | C10—H10 | 0.980 |
C4—C5 | 1.531 (2) | C12—H121 | 0.970 |
C5—C6 | 1.542 (2) | C12—H122 | 0.970 |
C6—C7 | 1.577 (2) | C13—H131 | 0.960 |
C6—C14 | 1.541 (2) | C13—H132 | 0.960 |
C7—C8 | 1.587 (2) | C13—H133 | 0.960 |
C7—C11 | 1.516 (2) | C14—H141 | 0.960 |
C7—C15 | 1.528 (2) | C14—H142 | 0.960 |
C8—C9 | 1.541 (2) | C14—H143 | 0.960 |
C9—C10 | 1.520 (2) | C15—H151 | 0.960 |
C10—C11 | 1.508 (2) | C15—H152 | 0.960 |
C11—C12 | 1.453 (2) | C15—H153 | 0.960 |
O2—H201 | 0.840 | ||
C1—O1—C10 | 114.24 (13) | C3—C4—H42 | 108.5 |
C11—O3—C12 | 60.14 (11) | C5—C4—H41 | 108.5 |
O1—C1—C2 | 106.26 (14) | C5—C4—H42 | 108.5 |
O1—C1—C6 | 111.87 (12) | H41—C4—H42 | 109.5 |
C2—C1—C6 | 113.14 (12) | C4—C5—H51 | 108.8 |
C1—C2—C3 | 124.36 (16) | C4—C5—H52 | 108.8 |
C2—C3—C4 | 121.26 (18) | C6—C5—H51 | 108.8 |
C2—C3—C13 | 122.95 (18) | C6—C5—H52 | 108.8 |
C4—C3—C13 | 115.78 (17) | H51—C5—H52 | 109.5 |
C3—C4—C5 | 113.36 (15) | O2—C8—H8 | 108.1 |
C4—C5—C6 | 112.11 (15) | C7—C8—H8 | 108.1 |
C1—C6—C5 | 106.63 (14) | C9—C8—H8 | 108.1 |
C1—C6—C7 | 108.69 (12) | C8—C9—H91 | 110.4 |
C1—C6—C14 | 109.07 (15) | C8—C9—H92 | 110.4 |
C5—C6—C7 | 111.85 (13) | C10—C9—H91 | 110.4 |
C5—C6—C14 | 109.60 (14) | C10—C9—H92 | 110.4 |
C7—C6—C14 | 110.88 (15) | H91—C9—H92 | 109.5 |
C6—C7—C8 | 113.63 (13) | O1—C10—H10 | 111.4 |
C6—C7—C11 | 106.61 (14) | C9—C10—H10 | 111.4 |
C6—C7—C15 | 113.16 (13) | C11—C10—H10 | 111.4 |
C8—C7—C11 | 97.80 (12) | O3—C12—H121 | 120.0 |
C8—C7—C15 | 110.62 (15) | O3—C12—H122 | 120.0 |
C11—C7—C15 | 114.07 (14) | C11—C12—H121 | 120.0 |
O2—C8—C7 | 117.07 (15) | C11—C12—H122 | 120.0 |
O2—C8—C9 | 109.54 (14) | H121—C12—H122 | 109.5 |
C7—C8—C9 | 105.64 (15) | C3—C13—H131 | 109.5 |
C8—C9—C10 | 105.72 (13) | C3—C13—H132 | 109.5 |
O1—C10—C9 | 112.64 (14) | C3—C13—H133 | 109.5 |
O1—C10—C11 | 108.15 (12) | H131—C13—H132 | 109.5 |
C9—C10—C11 | 101.46 (15) | H131—C13—H133 | 109.5 |
O3—C11—C7 | 118.26 (15) | H132—C13—H133 | 109.5 |
O3—C11—C10 | 113.99 (12) | C6—C14—H141 | 109.5 |
O3—C11—C12 | 59.75 (11) | C6—C14—H142 | 109.5 |
C7—C11—C10 | 103.95 (13) | C6—C14—H143 | 109.5 |
C7—C11—C12 | 129.49 (14) | H141—C14—H142 | 109.5 |
C10—C11—C12 | 123.35 (16) | H141—C14—H143 | 109.5 |
O3—C12—C11 | 60.11 (11) | H142—C14—H143 | 109.5 |
C8—O2—H201 | 110.7 | C7—C15—H151 | 109.5 |
O1—C1—H1 | 108.5 | C7—C15—H152 | 109.5 |
C2—C1—H1 | 108.5 | C7—C15—H153 | 109.5 |
C6—C1—H1 | 108.5 | H151—C15—H152 | 109.5 |
C1—C2—H2 | 117.8 | H151—C15—H153 | 109.5 |
C3—C2—H2 | 117.8 | H152—C15—H153 | 109.5 |
C3—C4—H41 | 108.5 | ||
C1—O1—C10—C9 | −48.89 (16) | C14—C6—C7—C11 | −179.10 (14) |
C1—O1—C10—C11 | 62.42 (17) | C14—C6—C7—C15 | 54.7 (2) |
C10—O1—C1—C2 | −175.48 (11) | C6—C7—C8—O2 | 40.8 (2) |
C10—O1—C1—C6 | −51.55 (16) | C6—C7—C8—C9 | −81.40 (17) |
C12—O3—C11—C7 | 121.49 (16) | C6—C7—C11—O3 | −163.39 (12) |
C12—O3—C11—C10 | −115.92 (18) | C6—C7—C11—C10 | 69.08 (15) |
O1—C1—C2—C3 | 105.4 (2) | C6—C7—C11—C12 | −90.7 (2) |
O1—C1—C6—C5 | −71.96 (16) | C8—C7—C11—O3 | 79.03 (15) |
O1—C1—C6—C7 | 48.78 (17) | C8—C7—C11—C10 | −48.50 (15) |
O1—C1—C6—C14 | 169.78 (14) | C8—C7—C11—C12 | 151.67 (18) |
C2—C1—C6—C5 | 48.01 (18) | C11—C7—C8—O2 | 152.82 (15) |
C2—C1—C6—C7 | 168.75 (14) | C11—C7—C8—C9 | 30.61 (16) |
C2—C1—C6—C14 | −70.25 (19) | C15—C7—C8—O2 | −87.74 (19) |
C6—C1—C2—C3 | −17.7 (2) | C15—C7—C8—C9 | 150.05 (15) |
C1—C2—C3—C4 | −3.0 (3) | C15—C7—C11—O3 | −37.8 (2) |
C1—C2—C3—C13 | 175.8 (2) | C15—C7—C11—C10 | −165.28 (15) |
C2—C3—C4—C5 | −9.8 (3) | C15—C7—C11—C12 | 34.9 (2) |
C13—C3—C4—C5 | 171.3 (2) | O2—C8—C9—C10 | −129.73 (15) |
C3—C4—C5—C6 | 43.1 (2) | C7—C8—C9—C10 | −2.80 (18) |
C4—C5—C6—C1 | −61.64 (19) | C8—C9—C10—O1 | 88.78 (16) |
C4—C5—C6—C7 | 179.67 (15) | C8—C9—C10—C11 | −26.62 (17) |
C4—C5—C6—C14 | 56.3 (2) | O1—C10—C11—O3 | 159.65 (14) |
C1—C6—C7—C8 | 47.34 (19) | O1—C10—C11—C7 | −70.22 (17) |
C1—C6—C7—C11 | −59.22 (16) | O1—C10—C11—C12 | 91.20 (19) |
C1—C6—C7—C15 | 174.58 (15) | C9—C10—C11—O3 | −81.67 (17) |
C5—C6—C7—C8 | 164.80 (14) | C9—C10—C11—C7 | 48.45 (16) |
C5—C6—C7—C11 | 58.24 (16) | C9—C10—C11—C12 | −150.13 (16) |
C5—C6—C7—C15 | −68.0 (2) | C7—C11—C12—O3 | −103.3 (2) |
C14—C6—C7—C8 | −72.54 (18) | C10—C11—C12—O3 | 100.35 (17) |
D—H···A | D—H | H···A | D···A | D—H···A |
O2—H201···O1i | 0.84 | 2.02 | 2.839 (2) | 165 |
Symmetry code: (i) x, y+1, z. |
Experimental details
Crystal data | |
Chemical formula | C15H22O3 |
Mr | 250.34 |
Crystal system, space group | Monoclinic, P21 |
Temperature (K) | 296 |
a, b, c (Å) | 6.8284 (2), 6.6209 (3), 14.7170 (6) |
β (°) | 96.7507 (11) |
V (Å3) | 660.74 (4) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.09 |
Crystal size (mm) | 0.66 × 0.49 × 0.28 |
Data collection | |
Diffractometer | Rigaku R-AXIS RAPID IP |
Absorption correction | Multi-scan (ABSCOR; Higashi, 1995) |
Tmin, Tmax | 0.934, 0.976 |
No. of measured, independent and observed [F2 > 2σ(F2)] reflections | 6503, 1634, 1540 |
Rint | 0.018 |
(sin θ/λ)max (Å−1) | 0.648 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.034, 0.095, 1.00 |
No. of reflections | 1634 |
No. of parameters | 164 |
No. of restraints | ? |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.17, −0.15 |
Computer programs: PROCESS-AUTO (Rigaku, 1998), CrystalStructure (Rigaku/MSC, 2002), SIR97 (Altomare et al., 1993), CRYSTALS (Watkin et al., 1996), ORTEP-3 for Windows (Farrugia, 1997), WinGX (Farrugia, 1999) and PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
O2—H201···O1i | 0.840 | 2.020 | 2.839 (2) | 164.9 |
Symmetry code: (i) x, y+1, z. |
Acknowledgements
The work was supported by the Science and Technology Project of Zhejiang Province (No. 2008 C02007–3) and the National Natural Science Foundation of China (No. 30700532).
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The endophytic fungi Trichoderma taxi sp. nov. from Taxus mairei can produce a compound with fungicidal activity-Trichodermin (Zhang et al., 2007), which is a member of the 4β-aceoxy-12,13-epoxytrichothecene family (Nielsen et al., 2005). Bioassays showed Trichodermin strongly inhibited Rhizoctonia solani and Botrytis cinere. In order to find the relationship between the stereochemistry of the C4 position and biological activities, the title compound had been designed and synthesized. Its molecular structure is shown in Fig. 1. In the molecule, the five membered ring displays an envelope conformation with atom C11 at the flap position 0.715 (3) Å out of the mean plane formed by the other four atoms. The O1-containing six-membered ring displays a chair conformation. The typical C2=C3 double bond length of 1.325 (2) Å suggests that C2 and C3 atoms are sp2 hybridized, which correlates with the larger C1—C2—C3 bond angle of 124.36 (16) ° and C2—C3—C4 bond angle of 122.95 (18) ° and a small C1—C2—C3—C4 torsion angle of -3.0 (3) °, as compared to 3.0 (3) ° in the compound of Trichodermin. And the C3-containing six-membered ring displays a half-chair conformation, as well as the compound of Trichodermin (Chen et al.). There are intermolecular O—H···O hydrogen bonds (Table 1) in the crystal structure, which lead to the formation of chains running along the b axis (Fig. 2).