organic compounds
3,6-Didehydro-5-hydroxy-1,2-O-isopropylidene-5-C-nitromethyl-α-D-glucofuranose
aNew Drug Reseach & Development Center, Zhengzhou Univresity, Zhengzhou 450001, People's Republic of China
*Correspondence e-mail: zqr409@126.com
The title compound, C10H15NO7, consists of one methylenedioxy ring and two fused tetrahydrofuran rings. The three fused rings exhibit cis arrangements at the ring junctions. One O atom of a tetrahydrofuran ring and the H atoms bound to the neighboring C atoms are disordered over two orientations with site-occupancy factors of 0.69 (1) and 0.31 (1). intramolecular O—H⋯O and C—H⋯O interactions stabilize the molecular conformation. In the intermolecular O—H⋯O and C—H⋯O interactions link the molecules into a three-dimensional network.
Related literature
For the synthesis of azasugars, see: Choi et al. (1991); Kvaernø et al. (2001). For the Henry reaction used to obtain the title compound, see: Saito et al. (2002). For research on and azasugars, see: Liu et al. (2004); Ke et al. (2009); Zhang et al. (2011). For a similar structure, see: Zhang & Yang (2010).
Experimental
Crystal data
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Refinement
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Data collection: SMART (Bruker, 2007); cell SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97.
Supporting information
10.1107/S160053681102191X/zq2104sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S160053681102191X/zq2104Isup2.hkl
The title compound was synthesized from 3,6-didehydro-1,2-O-isopropylidene-5-carbonyl-α-D-glucofuranose with Henry reaction as described previously by Saito et al. (2002) whose starting material was D-glucose. To a solution of the starting material (2.4 g, 9.2 mmol) in tetrahydrofuran (30 ml) was added CH3NO2 (0.82 ml) and potassium fluoride (0.84 g) under ice bath. The mixture was stirred at room temperature for 12 h. After the material was consumed, the reaction mixture was filtered to remove the KF. The filtrate was concentrated in vacuo to yield the residue, which was recrystalized in CH3OH to obtain the title compound as a white solid. Crystals suitable for X-ray analysis were grown by slow evaporation from methanol at room temperature for two weeks.
All H atoms were placed geometrically and treated as riding on their parent atoms, with C—H = 0.96 Å and Uiso(H) =1.5Ueq(C) for methyl H atoms, with C—H = 0.97 Å and Uiso(H) =1.2Ueq(C) for methylene H atoms, and with C—H = 0.98 Å and Uiso(H) =1.2Ueq(C) for methine H atoms. The hydroxy H atom was freely refined. In the absence of any significant anomalous scatterers in the molecule, attempts to confirm the
by of the in the presence of 896 sets of Friedel equivalents led to an inconclusive value of 0.0 (3). Therefore, the Friedel pairs were merged before the final and the was assigned to correspond with that of the known chiral centres in the precursor molecule, which remained unchanged during the synthesis of the title compound.One O atom of a tetrahydrofuran ring moiety is disordered over two positions with site-occupancy factors of 0.69 (1) and 0.31 (1), the H atoms bound to the neighboring atoms C3 and C6 were disordered as well over two positions.
Data collection: SMART (Bruker, 2007); cell
SAINT (Bruker, 2007); data reduction: SAINT (Bruker, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).Fig. 1. The molecular structure of the title compound showing the atomic numbering and 30% probability displacement ellipsoids. |
C10H15NO7 | Dx = 1.450 Mg m−3 |
Mr = 261.23 | Melting point = 392–394 K |
Orthorhombic, P212121 | Cu Kα radiation, λ = 1.54184 Å |
Hall symbol: P 2ac 2ab | Cell parameters from 5453 reflections |
a = 5.63290 (13) Å | θ = 3.5–70.0° |
b = 8.36405 (15) Å | µ = 1.07 mm−1 |
c = 25.4014 (5) Å | T = 291 K |
V = 1196.76 (4) Å3 | Block, white |
Z = 4 | 0.24 × 0.22 × 0.20 mm |
F(000) = 552 |
Bruker SMART diffractometer | 2249 independent reflections |
Radiation source: Enhance (Cu) X-ray Source | 2161 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.021 |
Detector resolution: 0 pixels mm-1 | θmax = 70.2°, θmin = 3.5° |
ω scans | h = −6→4 |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | k = −9→10 |
Tmin = 0.783, Tmax = 0.814 | l = −29→30 |
7427 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)] = 0.053 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.165 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.08 | w = 1/[σ2(Fo2) + (0.1069P)2 + 0.3286P] where P = (Fo2 + 2Fc2)/3 |
2249 reflections | (Δ/σ)max < 0.001 |
174 parameters | Δρmax = 0.59 e Å−3 |
8 restraints | Δρmin = −0.43 e Å−3 |
C10H15NO7 | V = 1196.76 (4) Å3 |
Mr = 261.23 | Z = 4 |
Orthorhombic, P212121 | Cu Kα radiation |
a = 5.63290 (13) Å | µ = 1.07 mm−1 |
b = 8.36405 (15) Å | T = 291 K |
c = 25.4014 (5) Å | 0.24 × 0.22 × 0.20 mm |
Bruker SMART diffractometer | 2249 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 2161 reflections with I > 2σ(I) |
Tmin = 0.783, Tmax = 0.814 | Rint = 0.021 |
7427 measured reflections |
R[F2 > 2σ(F2)] = 0.053 | 8 restraints |
wR(F2) = 0.165 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.08 | Δρmax = 0.59 e Å−3 |
2249 reflections | Δρmin = −0.43 e Å−3 |
174 parameters |
Experimental. Melting point: 119–121 °C; Rf = 0.67 (CHCl3/EtOAc, 7:3); 1H NMR (400 MHz, CDCl3) σ: 5.98 (d, J = 3.4 Hz, 1H), 4.81 (d, J = 4.3 Hz, 1H), 4.68 (d, J = 3.4 Hz, 1H), 4.60 (dd, J = 8.3, 4.0 Hz, 2H), 4.52 (d, J = 12.3 Hz, 1H), 3.83 (d, J = 10.0 Hz, 1H), 3.75 (d, J = 10.0 Hz, 1H), 3.36 (s, 1H), 1.51 (s, 3H), 1.36 (s, 3H); 13C NMR (100 MHz, CDCl3) σ: 113.60, 107.18, 85.35, 85.08, 83.80, 78.62, 78.42, 74.89, 27.49, 26.77. |
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 | Occ. (<1) | |
O1 | 0.8215 (5) | −0.0074 (2) | 0.86303 (8) | 0.0635 (6) | |
O2 | 0.5738 (5) | 0.1567 (3) | 0.81809 (9) | 0.0693 (7) | |
O3 | 0.4254 (5) | 0.4145 (8) | 0.92867 (15) | 0.0833 (16) | 0.695 (10) |
O3A | 0.4631 (15) | 0.3468 (10) | 0.93694 (15) | 0.0833 (16) | 0.305 (10) |
O4 | 0.8877 (4) | 0.2199 (2) | 0.91272 (11) | 0.0726 (8) | |
O5 | 1.0074 (4) | 0.4587 (3) | 0.97889 (8) | 0.0526 (5) | |
H5 | 1.070 (10) | 0.374 (6) | 0.966 (2) | 0.113 (19)* | |
O6 | 1.1140 (5) | 0.6590 (3) | 0.86098 (10) | 0.0729 (7) | |
O7 | 1.2025 (5) | 0.7827 (3) | 0.93199 (11) | 0.0735 (7) | |
N1 | 1.0673 (5) | 0.7059 (3) | 0.90501 (9) | 0.0487 (6) | |
C1 | 0.7251 (6) | 0.1003 (3) | 0.89903 (10) | 0.0530 (7) | |
H1 | 0.6693 | 0.0440 | 0.9305 | 0.064* | |
C2 | 0.5231 (5) | 0.1803 (4) | 0.87177 (13) | 0.0598 (8) | |
H2 | 0.3681 | 0.1375 | 0.8822 | 0.072* | |
C3 | 0.5524 (6) | 0.3547 (5) | 0.88496 (14) | 0.0712 (11) | |
H3A | 0.5120 | 0.4186 | 0.8539 | 0.085* | 0.695 (10) |
H3B | 0.4794 | 0.4325 | 0.8611 | 0.085* | 0.305 (10) |
C4 | 0.8110 (5) | 0.3724 (3) | 0.89597 (11) | 0.0450 (6) | |
H4 | 0.9001 | 0.4120 | 0.8655 | 0.054* | |
C5 | 0.8201 (4) | 0.4884 (3) | 0.94342 (9) | 0.0378 (5) | |
C6 | 0.5819 (5) | 0.4568 (4) | 0.96985 (11) | 0.0517 (6) | |
H6A | 0.5953 | 0.3704 | 0.9952 | 0.062* | 0.695 (10) |
H6B | 0.5259 | 0.5518 | 0.9879 | 0.062* | 0.695 (10) |
H6C | 0.6048 | 0.4120 | 1.0047 | 0.062* | 0.305 (10) |
H6D | 0.4915 | 0.5550 | 0.9730 | 0.062* | 0.305 (10) |
C7 | 0.7269 (6) | 0.0235 (3) | 0.81191 (10) | 0.0488 (7) | |
C8 | 0.9245 (10) | 0.0693 (8) | 0.7760 (2) | 0.1050 (16) | |
H8A | 1.0428 | −0.0133 | 0.7761 | 0.157* | |
H8B | 0.9940 | 0.1677 | 0.7879 | 0.157* | |
H8C | 0.8640 | 0.0830 | 0.7410 | 0.157* | |
C9 | 0.5948 (9) | −0.1217 (5) | 0.79390 (18) | 0.0830 (12) | |
H9A | 0.4567 | −0.1366 | 0.8155 | 0.125* | |
H9B | 0.6958 | −0.2138 | 0.7967 | 0.125* | |
H9C | 0.5471 | −0.1080 | 0.7579 | 0.125* | |
C10 | 0.8305 (5) | 0.6646 (3) | 0.92708 (11) | 0.0437 (6) | |
H10A | 0.7090 | 0.6856 | 0.9009 | 0.052* | |
H10B | 0.7985 | 0.7315 | 0.9575 | 0.052* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0991 (17) | 0.0435 (10) | 0.0480 (10) | 0.0213 (12) | −0.0142 (12) | −0.0086 (8) |
O2 | 0.0906 (17) | 0.0641 (13) | 0.0533 (11) | 0.0267 (12) | −0.0249 (12) | −0.0142 (10) |
O3 | 0.0301 (13) | 0.080 (4) | 0.140 (3) | 0.0168 (15) | 0.0027 (14) | −0.075 (3) |
O3A | 0.0301 (13) | 0.080 (4) | 0.140 (3) | 0.0168 (15) | 0.0027 (14) | −0.075 (3) |
O4 | 0.0591 (13) | 0.0422 (10) | 0.117 (2) | 0.0172 (10) | −0.0355 (13) | −0.0200 (12) |
O5 | 0.0480 (10) | 0.0557 (12) | 0.0542 (11) | 0.0076 (9) | −0.0076 (9) | 0.0032 (9) |
O6 | 0.0897 (17) | 0.0640 (14) | 0.0650 (13) | −0.0128 (13) | 0.0300 (13) | −0.0073 (11) |
O7 | 0.0693 (13) | 0.0674 (13) | 0.0836 (16) | −0.0247 (13) | −0.0016 (13) | −0.0072 (12) |
N1 | 0.0578 (14) | 0.0353 (10) | 0.0529 (12) | −0.0020 (10) | 0.0079 (11) | 0.0004 (9) |
C1 | 0.084 (2) | 0.0345 (12) | 0.0409 (13) | −0.0002 (13) | −0.0035 (14) | −0.0024 (9) |
C2 | 0.0429 (14) | 0.0694 (19) | 0.0670 (18) | −0.0064 (14) | −0.0001 (13) | −0.0269 (15) |
C3 | 0.0604 (19) | 0.073 (2) | 0.080 (2) | 0.0310 (17) | −0.0269 (17) | −0.0296 (18) |
C4 | 0.0550 (15) | 0.0337 (11) | 0.0463 (13) | 0.0003 (11) | 0.0054 (12) | −0.0045 (10) |
C5 | 0.0377 (11) | 0.0358 (11) | 0.0398 (11) | 0.0029 (10) | 0.0024 (10) | 0.0019 (9) |
C6 | 0.0494 (14) | 0.0501 (15) | 0.0556 (14) | −0.0030 (12) | 0.0124 (12) | −0.0011 (12) |
C7 | 0.0614 (16) | 0.0471 (14) | 0.0380 (12) | 0.0021 (12) | −0.0008 (12) | −0.0023 (10) |
C8 | 0.100 (3) | 0.133 (4) | 0.082 (3) | −0.014 (3) | 0.033 (3) | 0.005 (3) |
C9 | 0.096 (3) | 0.074 (2) | 0.079 (2) | −0.011 (2) | −0.014 (2) | −0.0243 (19) |
C10 | 0.0494 (13) | 0.0330 (11) | 0.0487 (12) | 0.0056 (10) | 0.0050 (12) | −0.0011 (10) |
O1—C1 | 1.394 (3) | C3—H3A | 0.9800 |
O1—C7 | 1.427 (3) | C3—H3B | 0.9800 |
O2—C2 | 1.407 (4) | C4—C5 | 1.548 (3) |
O2—C7 | 1.418 (4) | C4—H4 | 0.9800 |
O3—C3 | 1.412 (3) | C5—C6 | 1.524 (3) |
O3—C6 | 1.413 (3) | C5—C10 | 1.532 (3) |
O3A—C6 | 1.412 (3) | C6—H6A | 0.9700 |
O3A—C3 | 1.414 (3) | C6—H6B | 0.9700 |
O4—C1 | 1.400 (4) | C6—H6C | 0.9700 |
O4—C4 | 1.413 (3) | C6—H6D | 0.9700 |
O5—C5 | 1.409 (3) | C7—C8 | 1.488 (6) |
O5—H5 | 0.86 (6) | C7—C9 | 1.497 (5) |
O6—N1 | 1.214 (3) | C8—H8A | 0.9600 |
O7—N1 | 1.209 (3) | C8—H8B | 0.9600 |
N1—C10 | 1.487 (4) | C8—H8C | 0.9600 |
C1—C2 | 1.490 (5) | C9—H9A | 0.9600 |
C1—H1 | 0.9800 | C9—H9B | 0.9600 |
C2—C3 | 1.506 (5) | C9—H9C | 0.9600 |
C2—H2 | 0.9800 | C10—H10A | 0.9700 |
C3—C4 | 1.491 (4) | C10—H10B | 0.9700 |
C1—O1—C7 | 109.5 (2) | C6—C5—C4 | 101.8 (2) |
C2—O2—C7 | 109.9 (2) | C10—C5—C4 | 113.1 (2) |
C3—O3—C6 | 110.8 (2) | O3A—C6—C5 | 105.6 (3) |
C6—O3A—C3 | 110.7 (3) | O3—C6—C5 | 105.5 (2) |
C1—O4—C4 | 111.7 (2) | O3A—C6—H6A | 86.8 |
C5—O5—H5 | 102 (4) | O3—C6—H6A | 110.6 |
O7—N1—O6 | 123.9 (3) | C5—C6—H6A | 110.6 |
O7—N1—C10 | 118.3 (2) | O3A—C6—H6B | 131.3 |
O6—N1—C10 | 117.8 (2) | O3—C6—H6B | 110.6 |
O1—C1—O4 | 111.7 (3) | C5—C6—H6B | 110.6 |
O1—C1—C2 | 106.4 (2) | H6A—C6—H6B | 108.8 |
O4—C1—C2 | 107.1 (2) | O3A—C6—H6C | 110.6 |
O1—C1—H1 | 110.5 | O3—C6—H6C | 131.4 |
O4—C1—H1 | 110.5 | C5—C6—H6C | 110.6 |
C2—C1—H1 | 110.5 | H6B—C6—H6C | 85.9 |
O2—C2—C1 | 103.5 (2) | O3A—C6—H6D | 110.6 |
O2—C2—C3 | 109.2 (3) | O3—C6—H6D | 86.9 |
C1—C2—C3 | 104.4 (2) | C5—C6—H6D | 110.6 |
O2—C2—H2 | 113.0 | H6A—C6—H6D | 128.1 |
C1—C2—H2 | 113.0 | H6C—C6—H6D | 108.7 |
C3—C2—H2 | 113.0 | O2—C7—O1 | 105.6 (2) |
O3—C3—C4 | 108.2 (2) | O2—C7—C8 | 108.7 (3) |
O3A—C3—C4 | 100.2 (4) | O1—C7—C8 | 108.9 (3) |
O3—C3—C2 | 117.5 (4) | O2—C7—C9 | 111.7 (3) |
O3A—C3—C2 | 97.1 (4) | O1—C7—C9 | 108.5 (3) |
C4—C3—C2 | 104.2 (2) | C8—C7—C9 | 113.2 (3) |
O3—C3—H3A | 108.9 | C7—C8—H8A | 109.5 |
O3A—C3—H3A | 134.0 | C7—C8—H8B | 109.5 |
C4—C3—H3A | 108.9 | H8A—C8—H8B | 109.5 |
C2—C3—H3A | 108.9 | C7—C8—H8C | 109.5 |
O3—C3—H3B | 92.3 | H8A—C8—H8C | 109.5 |
O3A—C3—H3B | 117.4 | H8B—C8—H8C | 109.5 |
C4—C3—H3B | 117.4 | C7—C9—H9A | 109.5 |
C2—C3—H3B | 117.4 | C7—C9—H9B | 109.5 |
O4—C4—C3 | 105.4 (3) | H9A—C9—H9B | 109.5 |
O4—C4—C5 | 108.7 (2) | C7—C9—H9C | 109.5 |
C3—C4—C5 | 103.9 (2) | H9A—C9—H9C | 109.5 |
O4—C4—H4 | 112.7 | H9B—C9—H9C | 109.5 |
C3—C4—H4 | 112.7 | N1—C10—C5 | 111.1 (2) |
C5—C4—H4 | 112.7 | N1—C10—H10A | 109.4 |
O5—C5—C6 | 110.3 (2) | C5—C10—H10A | 109.4 |
O5—C5—C10 | 108.3 (2) | N1—C10—H10B | 109.4 |
C6—C5—C10 | 108.7 (2) | C5—C10—H10B | 109.4 |
O5—C5—C4 | 114.3 (2) | H10A—C10—H10B | 108.0 |
C7—O1—C1—O4 | −104.4 (3) | C2—C3—C4—C5 | −140.4 (3) |
C7—O1—C1—C2 | 12.2 (3) | O4—C4—C5—O5 | 34.3 (3) |
C4—O4—C1—O1 | 115.3 (3) | C3—C4—C5—O5 | 146.2 (3) |
C4—O4—C1—C2 | −0.9 (4) | O4—C4—C5—C6 | −84.7 (3) |
C7—O2—C2—C1 | 22.4 (3) | C3—C4—C5—C6 | 27.2 (3) |
C7—O2—C2—C3 | 133.2 (3) | O4—C4—C5—C10 | 158.9 (2) |
O1—C1—C2—O2 | −20.9 (3) | C3—C4—C5—C10 | −89.2 (3) |
O4—C1—C2—O2 | 98.6 (3) | C3—O3A—C6—O3 | 70.2 (3) |
O1—C1—C2—C3 | −135.2 (3) | C3—O3A—C6—C5 | −23.2 (8) |
O4—C1—C2—C3 | −15.6 (3) | C3—O3—C6—O3A | −70.5 (3) |
C6—O3—C3—O3A | 70.3 (3) | C3—O3—C6—C5 | 23.6 (6) |
C6—O3—C3—C4 | −5.4 (6) | O5—C5—C6—O3A | −125.5 (5) |
C6—O3—C3—C2 | 112.1 (4) | C10—C5—C6—O3A | 115.9 (5) |
C6—O3A—C3—O3 | −70.3 (3) | C4—C5—C6—O3A | −3.8 (5) |
C6—O3A—C3—C4 | 40.3 (8) | O5—C5—C6—O3 | −152.7 (3) |
C6—O3A—C3—C2 | 146.2 (7) | C10—C5—C6—O3 | 88.7 (4) |
O2—C2—C3—O3 | 155.5 (3) | C4—C5—C6—O3 | −31.0 (4) |
C1—C2—C3—O3 | −94.4 (4) | C2—O2—C7—O1 | −15.6 (3) |
O2—C2—C3—O3A | 172.8 (5) | C2—O2—C7—C8 | −132.3 (3) |
C1—C2—C3—O3A | −77.1 (5) | C2—O2—C7—C9 | 102.1 (3) |
O2—C2—C3—C4 | −84.8 (3) | C1—O1—C7—O2 | 1.4 (3) |
C1—C2—C3—C4 | 25.3 (4) | C1—O1—C7—C8 | 118.0 (4) |
C1—O4—C4—C3 | 17.3 (3) | C1—O1—C7—C9 | −118.4 (3) |
C1—O4—C4—C5 | 128.2 (3) | O7—N1—C10—C5 | −104.9 (3) |
O3—C3—C4—O4 | 99.7 (4) | O6—N1—C10—C5 | 74.5 (3) |
O3A—C3—C4—O4 | 74.0 (4) | O5—C5—C10—N1 | 55.5 (3) |
C2—C3—C4—O4 | −26.1 (3) | C6—C5—C10—N1 | 175.3 (2) |
O3—C3—C4—C5 | −14.6 (5) | C4—C5—C10—N1 | −72.4 (3) |
O3A—C3—C4—C5 | −40.3 (4) |
D—H···A | D—H | H···A | D···A | D—H···A |
O5—H5···O4 | 0.86 (6) | 2.13 (6) | 2.696 (3) | 123 (5) |
O5—H5···O3i | 0.86 (6) | 2.24 (6) | 2.703 (3) | 114 (4) |
C1—H1···O5ii | 0.98 | 2.48 | 3.371 (3) | 152 |
C4—H4···O6 | 0.98 | 2.39 | 3.074 (4) | 126 |
Symmetry codes: (i) x+1, y, z; (ii) x−1/2, −y+1/2, −z+2. |
Experimental details
Crystal data | |
Chemical formula | C10H15NO7 |
Mr | 261.23 |
Crystal system, space group | Orthorhombic, P212121 |
Temperature (K) | 291 |
a, b, c (Å) | 5.63290 (13), 8.36405 (15), 25.4014 (5) |
V (Å3) | 1196.76 (4) |
Z | 4 |
Radiation type | Cu Kα |
µ (mm−1) | 1.07 |
Crystal size (mm) | 0.24 × 0.22 × 0.20 |
Data collection | |
Diffractometer | Bruker SMART diffractometer |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.783, 0.814 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 7427, 2249, 2161 |
Rint | 0.021 |
(sin θ/λ)max (Å−1) | 0.610 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.053, 0.165, 1.08 |
No. of reflections | 2249 |
No. of parameters | 174 |
No. of restraints | 8 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.59, −0.43 |
Computer programs: SMART (Bruker, 2007), SAINT (Bruker, 2007), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
O5—H5···O4 | 0.86 (6) | 2.13 (6) | 2.696 (3) | 123 (5) |
O5—H5···O3i | 0.86 (6) | 2.24 (6) | 2.703 (3) | 114 (4) |
C1—H1···O5ii | 0.98 | 2.48 | 3.371 (3) | 152 |
C4—H4···O6 | 0.98 | 2.39 | 3.074 (4) | 126 |
Symmetry codes: (i) x+1, y, z; (ii) x−1/2, −y+1/2, −z+2. |
Acknowledgements
We gratefully acknowledge financial support by the National Natural Science Foundation of China (grant No. 20572103).
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.
Azasugars containing some novel glycosyls such as bicyclo-glycosyl and heterocycle glycosyl, the synthesis of which being known for many years (Choi et al., 1991; Kvaernø et al., 2001), have attracted a growing interest due to their potent antiviral activity. As a contribution to the research for carbohydrate and azasugars compounds (Liu et al., 2004; Ke et al., 2009), we report here the synthesis and X-ray crystal structure of the title compound, an intermediate of bicyclo-glycosyl. The title compound, which shows a similar structure to the one previously reported by Zhang & Yang (2010), was enantiomerically synthesized at room tempeature by means of the Henry reaction (Saito et al., 2002).
The title compound, C10H15NO7, consists of one methylenedioxy ring and two fused tetrahydrofuran rings. The three fused rings exhibit cis arrangements at the ring junctions and give two V-shaped molecules. One O atom of a tetrahydrofuran ring moiety is disordered over two positions with site-occupancy factors of 0.69 (1) and 0.31 (1), the H atoms bound to the neighboring C atoms were disordered as well. The bond angles O2—C7—O1 and C8—C7—C9 around the isopropylidene are 105.6 (2) and 113.2 (3)°, which are almost equal to the corresponding bond angles reported by Zhang & Yang (2010). The bond angle O5—C5—C10 containing simultaneously hydroxy and nitromethylene is 108.3 (2)°. The torsion angles C2—C3—C4—C5, O3—C3—C4—O4, O4—C1—C2—O2 and O1—C1—C2—C3 are -140.4 (3), 99.7 (4), 98.6 (3) and -135.2 (3) °, respectively.
In the crystal structure, some intra- and intermolecular O—H···O and C—H···O interactions exist to stabilize the molecular conformation and link the molecules into a three-dimensional network.