organic compounds
Phenyl 2,3-O-isopropylidene-1-thio-α-D-rhamnopyranoside
aSchool of Chemical Sciences, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia, and bDepartment of Chemistry, University of Otago, PO Box 56, Dunedin, New Zealand
*Correspondence e-mail: jsimpson@alkali.otago.ac.nz
In the title compound, C15H20O4S, a dioxolane ring is fused to the pyran ring of the sugar which carries a thiophenyl substituent on the anomeric C atom. The dioxolane ring adopts an and the pyran ring system a distorted 4C1 chair. The structure is stabilized by O—H⋯O hydrogen bonds, forming centrosymmetric dimers that generate an R22(10) ring motif. Additional C—H⋯O interactions form an extended network. Two C atoms of the phenyl ring are disordered over two positions; the site occupancy factors are ca. 0.7 and 0.3.
Related literature
For the background to angucyline antibiotics, see: Carreno & Urbano (2005); Toshima (2003); Krohn & Rohr (1997); Rohr & Thiericke (1992). For previous reports of the title compound, see: Kerekgyarto et al., (1993); Yu & Wang, (2002). For related structures, see, for example: Yang et al. (2003); Wehlan et al. (2004). For ring puckering analysis, see: Cremer & Pople (1975). For graph-set analysis of hydrogen bonding, see: Bernstein et al. (1995).
Experimental
Crystal data
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Data collection: APEX2 (Bruker, 2004); cell SAINT (Bruker, 2004); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997) and TITAN2000 (Hunter & Simpson, 1999); molecular graphics: ORTEP-3 (Farrugia, 1997) and Mercury (Macrae et al., 2006); software used to prepare material for publication: SHELXL97 and enCIFer (Allen et al., 2004).
Supporting information
https://doi.org/10.1107/S1600536807061004/ng2385sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536807061004/ng2385Isup2.hkl
LiAlH4 (0.590 g, 15.6 mmol) was carefully added to a solution of tosylate (1) (2.00 g, 4.30 mmol) in diethyl ether (100 ml) cooled in an ice-salt bath. The ice bath was removed and the mixture was stirred under nitrogen for 12 h. The reaction was cooled in ice and quenched by the addition of 1M sodium hydroxide (5 ml). The mixture was extracted with diethyl ether, the organic layer washed with brine (50 ml) and water (2 x 100 mL). After drying over anhydrous magnesium sulfate the solvent was removed in vacuo. Purification of the residue by silica gel α]D = +199.3 (c 0.6, CH2Cl2); νmax (KBr): 3597, 2938, 2923, 1603, 1382, 1214, 1062 cm-1; δH(300 MHz, CDCl3): 1.26 (3H, d, J = 6.0 Hz, H-6), 1.39 (3H, s, CH3), 1.56 (3H, s, CH3), 2.2 (1H, OH), 3.50 (1H, m, H-5), 4.10 (1H, d, J = 6.4 Hz, H-2), 4.17 (1H, t, J = 7.1 Hz, H-4), 4.37 (2H, d, J = 0.9 Hz, H-3), 5.76 (1H, s, H-1), 7.32–7.50 (5H, m, PhH); δC(125 MHz, CDCl3): 17.13, 26.47, 28.22, 67.02, 75.32, 76.66, 77.50, 78.41, 88.31, 109.84, 127.67, 129.11, 131.93, 133.47; Found: C, 60.57; H, 6.80, S, 10.65%. C15H20O4S requires C, 60.79; H, 6.80; S, 10.82%.
[hexane/diethyl ether 1:1 to 2:1 as eluant] afforded two fractions. The higher RF fraction gave the title compound (2) (0.800 g, 63%) as a white crystalline solid. m.p. 76° C; [The C11 and C12 atoms of the thiophenyl ring were disordered over two conformations. The occupancy factor for the major component refined to 0.66 (3). H-atoms were positioned geometrically and refined using a riding model with d(C—H) = 0.93 Å, Uiso=1.2Ueq (C) for aromatic 0.98 Å, Uiso = 1.2Ueq (C) for CH, 0.96 Å, Uiso = 1.5Ueq (C) for CH3 and 0.82 Å, Uiso = 1.5Ueq (O) for the OH group.
In a sequence aimed at synthesizing 2,6-dideoxy-D-arabinopyranosides for use as glycosyl donors for the preparation of C-glycosides related to the angucycline antibiotics (Carreno & Urbano, 2005; Toshima, 2003; Krohn & Rohr, 1997; Rohr & Thiericke, 1992) we reduced tosylate (1) with lithium aluminium hydride to furnish the title compound (2), a known D-rhamnoside, (Kerekgyarto et al., 1993; Yu & Wang, 2002) in 63% yield (Scheme 1). An unexpected by-product (3), where reduction of the isopropylidene group had occurred, was also isolated in 14% yield.
In (2), Fig. 1, the C2, C3, O2, C7, O3 dioxolane ring is fused to the pyran C1···C5, O1 ring of the sugar which carries a thiophenyl substituent on the anomeric C1 atom. The dioxolane ring adopts an θ = 17.9 (3)(Cremer & Pople, 1975).
with C2 0.600 (3)Å from the meanplane through C3, O2, C7, O3. The pyran ring system is in a distorted 4C1 chair conformation with O1 and C3 0.609 (4) and -0.514 (4)Å from the meanplane through C1, C2, C4, C5 andIn the crystal, adjacent molecules form inversion related dimers through O4—H4A···O3i hydrogen -bonds (i = -x, y, -z + 1, Table 1, Fig. 2) in an R22(10) ring motif (Bernstein et al., 1995). C—H···O hydrogen bonds stabilize the structure further, forming an extended network (Fig. 3).
For the background to angucyline antibiotics, see: Carreno & Urbano (2005); Toshima (2003); Krohn & Rohr (1997); Rohr & Thiericke (1992). For previous reports of the title compound, see: Kerekgyarto et al., (1993); Yu & Wang, (2002). For related structures, see for example: Yang et al. (2003); Wehlan et al. (2004). For ring puckering analysis, see: Cremer & Pople (1975. For graph-set analysis of hydrogen bonding, see: Bernstein et al. (1995).
Data collection: APEX2 (Bruker, 2004); cell
SAINT (Bruker, 2004); data reduction: SAINT (Bruker, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997) and TITAN2000 (Hunter & Simpson, 1999); molecular graphics: ORTEP-3 (Farrugia, 1997) and Mercury (Bruno et al., 2002); software used to prepare material for publication: SHELXL97 & enCIFer (Allen et al., 2004).C15H20O4S | F(000) = 632 |
Mr = 296.37 | Dx = 1.274 Mg m−3 |
Monoclinic, C2 | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: C 2y | Cell parameters from 4464 reflections |
a = 24.3029 (12) Å | θ = 5.1–53.9° |
b = 5.3048 (3) Å | µ = 0.22 mm−1 |
c = 12.0795 (7) Å | T = 295 K |
β = 97.014 (3)° | Irregular fragment, colourless |
V = 1545.66 (15) Å3 | 0.37 × 0.30 × 0.08 mm |
Z = 4 |
Bruker APEXII CCD diffractometer | 3318 independent reflections |
Radiation source: fine-focus sealed tube | 2560 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.060 |
φ & ω scans | θmax = 27.1°, θmin = 1.7° |
Absorption correction: multi-scan (SADABS; Bruker, 2004) | h = −30→30 |
Tmin = 0.723, Tmax = 0.983 | k = −6→6 |
17181 measured reflections | l = −15→15 |
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.039 | H-atom parameters constrained |
wR(F2) = 0.144 | w = 1/[σ2(Fo2) + (0.1017P)2 + ] where P = (Fo2 + 2Fc2)/3 |
S = 1.04 | (Δ/σ)max = 0.002 |
3318 reflections | Δρmax = 0.33 e Å−3 |
204 parameters | Δρmin = −0.37 e Å−3 |
1 restraint | Absolute structure: Flack (1983) 1392 Friedel pairs |
Primary atom site location: structure-invariant direct methods | Absolute structure parameter: 0.03 (10) |
C15H20O4S | V = 1545.66 (15) Å3 |
Mr = 296.37 | Z = 4 |
Monoclinic, C2 | Mo Kα radiation |
a = 24.3029 (12) Å | µ = 0.22 mm−1 |
b = 5.3048 (3) Å | T = 295 K |
c = 12.0795 (7) Å | 0.37 × 0.30 × 0.08 mm |
β = 97.014 (3)° |
Bruker APEXII CCD diffractometer | 3318 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2004) | 2560 reflections with I > 2σ(I) |
Tmin = 0.723, Tmax = 0.983 | Rint = 0.060 |
17181 measured reflections |
R[F2 > 2σ(F2)] = 0.039 | H-atom parameters constrained |
wR(F2) = 0.144 | Δρmax = 0.33 e Å−3 |
S = 1.04 | Δρmin = −0.37 e Å−3 |
3318 reflections | Absolute structure: Flack (1983) 1392 Friedel pairs |
204 parameters | Absolute structure parameter: 0.03 (10) |
1 restraint |
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 | 0.18083 (7) | 0.4599 (4) | 0.64558 (13) | 0.0532 (4) | |
C1 | 0.17180 (10) | 0.3676 (5) | 0.75001 (19) | 0.0463 (6) | |
H1 | 0.1818 | 0.5016 | 0.8046 | 0.056* | |
C2 | 0.11178 (10) | 0.2973 (5) | 0.7572 (2) | 0.0463 (6) | |
H2 | 0.1093 | 0.1902 | 0.8225 | 0.056* | |
C3 | 0.08248 (9) | 0.1708 (5) | 0.6530 (2) | 0.0496 (6) | |
H3 | 0.0887 | −0.0116 | 0.6565 | 0.060* | |
C4 | 0.09941 (10) | 0.2762 (5) | 0.5457 (2) | 0.0533 (6) | |
H4 | 0.0827 | 0.4433 | 0.5321 | 0.064* | |
O4 | 0.08181 (8) | 0.1174 (5) | 0.45401 (18) | 0.0823 (8) | |
H4A | 0.0497 | 0.1512 | 0.4298 | 0.123* | |
C5 | 0.16240 (11) | 0.2999 (7) | 0.5535 (2) | 0.0642 (8) | |
H5 | 0.1796 | 0.1333 | 0.5644 | 0.077* | |
C6 | 0.18068 (16) | 0.4260 (13) | 0.4507 (3) | 0.1080 (17) | |
H6A | 0.1657 | 0.5935 | 0.4437 | 0.162* | |
H6B | 0.1674 | 0.3300 | 0.3855 | 0.162* | |
H6C | 0.2204 | 0.4338 | 0.4581 | 0.162* | |
O2 | 0.07846 (7) | 0.5178 (3) | 0.76344 (14) | 0.0476 (4) | |
O3 | 0.02550 (7) | 0.2257 (3) | 0.66139 (16) | 0.0527 (4) | |
C7 | 0.02277 (10) | 0.4350 (5) | 0.7378 (2) | 0.0474 (5) | |
C8 | −0.01126 (11) | 0.6449 (5) | 0.6803 (2) | 0.0570 (7) | |
H8A | −0.0087 | 0.7914 | 0.7273 | 0.085* | |
H8B | −0.0493 | 0.5927 | 0.6657 | 0.085* | |
H8C | 0.0025 | 0.6846 | 0.6111 | 0.085* | |
C9 | −0.00051 (14) | 0.3396 (9) | 0.8398 (3) | 0.0822 (10) | |
H9A | 0.0235 | 0.2116 | 0.8751 | 0.123* | |
H9B | −0.0367 | 0.2698 | 0.8185 | 0.123* | |
H9C | −0.0031 | 0.4764 | 0.8909 | 0.123* | |
S1 | 0.21316 (3) | 0.08767 (14) | 0.79616 (7) | 0.0730 (3) | |
C10 | 0.27881 (10) | 0.2165 (5) | 0.8419 (2) | 0.0494 (6) | |
C11 | 0.3053 (4) | 0.385 (3) | 0.7765 (10) | 0.077 (3) | 0.66 (3) |
H11 | 0.2869 | 0.4429 | 0.7094 | 0.092* | 0.66 (3) |
C12 | 0.3583 (4) | 0.464 (3) | 0.8110 (13) | 0.100 (5) | 0.66 (3) |
H12 | 0.3765 | 0.5692 | 0.7659 | 0.120* | 0.66 (3) |
C11A | 0.2958 (5) | 0.456 (3) | 0.8190 (18) | 0.058 (4) | 0.34 (3) |
H11A | 0.2721 | 0.5644 | 0.7752 | 0.070* | 0.34 (3) |
C12A | 0.3488 (6) | 0.534 (3) | 0.8621 (19) | 0.073 (4) | 0.34 (3) |
H12A | 0.3587 | 0.7016 | 0.8523 | 0.088* | 0.34 (3) |
C13 | 0.38489 (15) | 0.3843 (9) | 0.9152 (3) | 0.0866 (11) | |
H13 | 0.4178 | 0.4591 | 0.9460 | 0.104* | |
C14 | 0.36232 (13) | 0.2024 (11) | 0.9680 (3) | 0.1015 (17) | |
H14 | 0.3821 | 0.1311 | 1.0310 | 0.122* | |
C15 | 0.30916 (13) | 0.1145 (11) | 0.9312 (3) | 0.0966 (15) | |
H15 | 0.2944 | −0.0170 | 0.9691 | 0.116* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0429 (9) | 0.0662 (11) | 0.0483 (10) | −0.0123 (8) | −0.0041 (7) | 0.0024 (8) |
C1 | 0.0379 (13) | 0.0511 (13) | 0.0457 (13) | −0.0075 (10) | −0.0115 (10) | 0.0022 (10) |
C2 | 0.0382 (12) | 0.0517 (13) | 0.0467 (13) | −0.0039 (10) | −0.0041 (10) | 0.0062 (10) |
C3 | 0.0297 (10) | 0.0385 (11) | 0.0767 (18) | −0.0033 (8) | −0.0093 (10) | −0.0065 (10) |
C4 | 0.0415 (13) | 0.0636 (15) | 0.0507 (15) | 0.0054 (12) | −0.0106 (10) | −0.0165 (12) |
O4 | 0.0537 (11) | 0.1026 (19) | 0.0830 (14) | 0.0181 (12) | −0.0224 (10) | −0.0498 (14) |
C5 | 0.0432 (14) | 0.091 (2) | 0.0564 (16) | 0.0000 (14) | −0.0021 (12) | −0.0170 (15) |
C6 | 0.077 (2) | 0.192 (5) | 0.0571 (19) | −0.017 (3) | 0.0178 (17) | −0.007 (3) |
O2 | 0.0397 (9) | 0.0506 (10) | 0.0503 (9) | −0.0060 (6) | −0.0029 (7) | −0.0082 (7) |
O3 | 0.0337 (8) | 0.0411 (9) | 0.0796 (12) | −0.0055 (6) | −0.0078 (8) | −0.0083 (8) |
C7 | 0.0386 (12) | 0.0497 (12) | 0.0528 (14) | −0.0065 (10) | 0.0007 (10) | −0.0012 (10) |
C8 | 0.0496 (15) | 0.0457 (14) | 0.0727 (18) | 0.0014 (10) | −0.0040 (12) | −0.0037 (11) |
C9 | 0.0603 (19) | 0.111 (3) | 0.077 (2) | −0.0063 (18) | 0.0179 (16) | 0.020 (2) |
S1 | 0.0472 (4) | 0.0536 (4) | 0.1102 (6) | −0.0067 (3) | −0.0231 (4) | 0.0170 (4) |
C10 | 0.0322 (11) | 0.0581 (15) | 0.0554 (15) | 0.0026 (10) | −0.0045 (10) | 0.0056 (11) |
C11 | 0.053 (4) | 0.113 (7) | 0.060 (5) | −0.021 (4) | −0.014 (3) | 0.036 (5) |
C12 | 0.050 (4) | 0.151 (10) | 0.093 (7) | −0.025 (5) | −0.016 (4) | 0.063 (7) |
C11A | 0.031 (4) | 0.072 (6) | 0.070 (9) | 0.014 (4) | 0.006 (5) | −0.005 (6) |
C12A | 0.044 (6) | 0.076 (7) | 0.102 (11) | −0.020 (4) | 0.021 (7) | −0.025 (7) |
C13 | 0.0476 (17) | 0.116 (3) | 0.090 (2) | −0.0140 (19) | −0.0161 (16) | 0.012 (2) |
C14 | 0.0487 (17) | 0.180 (5) | 0.070 (2) | −0.007 (2) | −0.0170 (15) | 0.045 (3) |
C15 | 0.0522 (16) | 0.158 (4) | 0.075 (2) | −0.017 (2) | −0.0119 (14) | 0.057 (3) |
O1—C1 | 1.395 (3) | C8—H8A | 0.9600 |
O1—C5 | 1.427 (3) | C8—H8B | 0.9600 |
C1—C2 | 1.518 (3) | C8—H8C | 0.9600 |
C1—S1 | 1.841 (3) | C9—H9A | 0.9600 |
C1—H1 | 0.9800 | C9—H9B | 0.9600 |
C2—O2 | 1.429 (3) | C9—H9C | 0.9600 |
C2—C3 | 1.525 (3) | S1—C10 | 1.762 (3) |
C2—H2 | 0.9800 | C10—C15 | 1.344 (4) |
C3—O3 | 1.431 (3) | C10—C11 | 1.400 (8) |
C3—C4 | 1.514 (4) | C10—C11A | 1.374 (15) |
C3—H3 | 0.9800 | C11—C12 | 1.369 (10) |
C4—O4 | 1.415 (3) | C11—H11 | 0.9300 |
C4—C5 | 1.527 (4) | C12—C13 | 1.407 (9) |
C4—H4 | 0.9800 | C12—H12 | 0.9300 |
O4—H4A | 0.8200 | C11A—C12A | 1.394 (19) |
C5—C6 | 1.524 (5) | C11A—H11A | 0.9300 |
C5—H5 | 0.9800 | C12A—C13 | 1.295 (18) |
C6—H6A | 0.9600 | C12A—H12A | 0.9300 |
C6—H6B | 0.9600 | C13—C14 | 1.313 (6) |
C6—H6C | 0.9600 | C13—H13 | 0.9300 |
O2—C7 | 1.421 (3) | C14—C15 | 1.394 (5) |
O3—C7 | 1.450 (3) | C14—H14 | 0.9300 |
C7—C9 | 1.506 (4) | C15—H15 | 0.9300 |
C7—C8 | 1.505 (3) | ||
C1—O1—C5 | 115.3 (2) | O3—C7—C8 | 109.76 (19) |
O1—C1—C2 | 113.34 (19) | C9—C7—C8 | 112.7 (3) |
O1—C1—S1 | 114.62 (18) | C7—C8—H8A | 109.5 |
C2—C1—S1 | 106.12 (17) | C7—C8—H8B | 109.5 |
O1—C1—H1 | 107.5 | H8A—C8—H8B | 109.5 |
C2—C1—H1 | 107.5 | C7—C8—H8C | 109.5 |
S1—C1—H1 | 107.5 | H8A—C8—H8C | 109.5 |
O2—C2—C1 | 110.9 (2) | H8B—C8—H8C | 109.5 |
O2—C2—C3 | 101.14 (19) | C7—C9—H9A | 109.5 |
C1—C2—C3 | 114.6 (2) | C7—C9—H9B | 109.5 |
O2—C2—H2 | 110.0 | H9A—C9—H9B | 109.5 |
C1—C2—H2 | 110.0 | C7—C9—H9C | 109.5 |
C3—C2—H2 | 110.0 | H9A—C9—H9C | 109.5 |
O3—C3—C4 | 110.6 (2) | H9B—C9—H9C | 109.5 |
O3—C3—C2 | 102.1 (2) | C10—S1—C1 | 102.83 (12) |
C4—C3—C2 | 113.3 (2) | C15—C10—C11 | 117.7 (4) |
O3—C3—H3 | 110.2 | C15—C10—C11A | 112.7 (8) |
C4—C3—H3 | 110.2 | C15—C10—S1 | 118.9 (3) |
C2—C3—H3 | 110.2 | C11—C10—S1 | 122.1 (3) |
O4—C4—C3 | 111.2 (2) | C11A—C10—S1 | 125.3 (6) |
O4—C4—C5 | 107.6 (2) | C12—C11—C10 | 120.2 (6) |
C3—C4—C5 | 110.6 (2) | C12—C11—H11 | 119.9 |
O4—C4—H4 | 109.1 | C10—C11—H11 | 119.9 |
C3—C4—H4 | 109.1 | C11—C12—C13 | 119.5 (6) |
C5—C4—H4 | 109.1 | C11—C12—H12 | 120.2 |
C4—O4—H4A | 109.5 | C13—C12—H12 | 120.2 |
O1—C5—C4 | 108.3 (2) | C10—C11A—C12A | 119.1 (11) |
O1—C5—C6 | 106.2 (3) | C10—C11A—H11A | 120.4 |
C4—C5—C6 | 112.0 (3) | C12A—C11A—H11A | 120.4 |
O1—C5—H5 | 110.1 | C13—C12A—C11A | 122.8 (12) |
C4—C5—H5 | 110.1 | C13—C12A—H12A | 118.6 |
C6—C5—H5 | 110.1 | C11A—C12A—H12A | 118.6 |
C5—C6—H6A | 109.5 | C14—C13—C12A | 113.2 (8) |
C5—C6—H6B | 109.5 | C14—C13—C12 | 118.7 (5) |
H6A—C6—H6B | 109.5 | C14—C13—H13 | 120.6 |
C5—C6—H6C | 109.5 | C12A—C13—H13 | 115.7 |
H6A—C6—H6C | 109.5 | C12—C13—H13 | 120.6 |
H6B—C6—H6C | 109.5 | C13—C14—C15 | 121.1 (3) |
C7—O2—C2 | 105.45 (18) | C13—C14—H14 | 119.4 |
C3—O3—C7 | 108.72 (17) | C15—C14—H14 | 119.4 |
O2—C7—O3 | 105.01 (18) | C10—C15—C14 | 121.2 (4) |
O2—C7—C9 | 111.6 (2) | C10—C15—H15 | 119.4 |
O3—C7—C9 | 108.3 (3) | C14—C15—H15 | 119.4 |
O2—C7—C8 | 109.1 (2) |
D—H···A | D—H | H···A | D···A | D—H···A |
O4—H4A···O3i | 0.82 | 2.05 | 2.861 (2) | 169 |
C8—H8A···O3ii | 0.96 | 2.61 | 3.224 (3) | 122 |
C14—H14···O2iii | 0.93 | 2.62 | 3.524 (4) | 164 |
Symmetry codes: (i) −x, y, −z+1; (ii) x, y+1, z; (iii) −x+1/2, y−1/2, −z+2. |
Experimental details
Crystal data | |
Chemical formula | C15H20O4S |
Mr | 296.37 |
Crystal system, space group | Monoclinic, C2 |
Temperature (K) | 295 |
a, b, c (Å) | 24.3029 (12), 5.3048 (3), 12.0795 (7) |
β (°) | 97.014 (3) |
V (Å3) | 1545.66 (15) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.22 |
Crystal size (mm) | 0.37 × 0.30 × 0.08 |
Data collection | |
Diffractometer | Bruker APEXII CCD |
Absorption correction | Multi-scan (SADABS; Bruker, 2004) |
Tmin, Tmax | 0.723, 0.983 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 17181, 3318, 2560 |
Rint | 0.060 |
(sin θ/λ)max (Å−1) | 0.642 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.039, 0.144, 1.04 |
No. of reflections | 3318 |
No. of parameters | 204 |
No. of restraints | 1 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.33, −0.37 |
Absolute structure | Flack (1983) 1392 Friedel pairs |
Absolute structure parameter | 0.03 (10) |
Computer programs: APEX2 (Bruker, 2004), SAINT (Bruker, 2004), SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997) and TITAN2000 (Hunter & Simpson, 1999), ORTEP-3 (Farrugia, 1997) and Mercury (Bruno et al., 2002), SHELXL97 & enCIFer (Allen et al., 2004).
D—H···A | D—H | H···A | D···A | D—H···A |
O4—H4A···O3i | 0.82 | 2.05 | 2.861 (2) | 168.6 |
C8—H8A···O3ii | 0.96 | 2.61 | 3.224 (3) | 122.3 |
C14—H14···O2iii | 0.93 | 2.62 | 3.524 (4) | 164.1 |
Symmetry codes: (i) −x, y, −z+1; (ii) x, y+1, z; (iii) −x+1/2, y−1/2, −z+2. |
Acknowledgements
We thank the University of Otago for the purchase of the diffractometer and the Universiti Sains Malaysia for the award of a postgraduate scholarship to HO.
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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.
In a sequence aimed at synthesizing 2,6-dideoxy-D-arabinopyranosides for use as glycosyl donors for the preparation of C-glycosides related to the angucycline antibiotics (Carreno & Urbano, 2005; Toshima, 2003; Krohn & Rohr, 1997; Rohr & Thiericke, 1992) we reduced tosylate (1) with lithium aluminium hydride to furnish the title compound (2), a known D-rhamnoside, (Kerekgyarto et al., 1993; Yu & Wang, 2002) in 63% yield (Scheme 1). An unexpected by-product (3), where reduction of the isopropylidene group had occurred, was also isolated in 14% yield.
In (2), Fig. 1, the C2, C3, O2, C7, O3 dioxolane ring is fused to the pyran C1···C5, O1 ring of the sugar which carries a thiophenyl substituent on the anomeric C1 atom. The dioxolane ring adopts an envelope conformation with C2 0.600 (3)Å from the meanplane through C3, O2, C7, O3. The pyran ring system is in a distorted 4C1 chair conformation with O1 and C3 0.609 (4) and -0.514 (4)Å from the meanplane through C1, C2, C4, C5 and θ = 17.9 (3)(Cremer & Pople, 1975).
In the crystal, adjacent molecules form inversion related dimers through O4—H4A···O3i hydrogen -bonds (i = -x, y, -z + 1, Table 1, Fig. 2) in an R22(10) ring motif (Bernstein et al., 1995). C—H···O hydrogen bonds stabilize the structure further, forming an extended network (Fig. 3).