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4-Formyl-phenyl 2,3,4,6-tetra-O-acetyl-β-d-galactopyran-oside.

ABSTRACT: The galactose ring in the title compound, C(21)H(24)O(11), has a chair conformation with the substituted benzene ring occupying an equatorial position. The crystal packing features C-H⋯O inter-actions that lead to the formation of supra-molecular layers in the ab plane.

SUBMITTER: Hussen RS

PROVIDER: S-EPMC3099913 | biostudies-literature |

REPOSITORIES: biostudies-literature

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4-Formyl-phenyl 2,3,4,6-tetra-O-acetyl-β-d-allopyran-oside.

Project description:The title compound, C(21)H(24)O(11), crystallizes exclusively as the β-anomer. The substituent of the protected sugar at position C-3 is in the axial position, while all other groups are in equatorial positions. The pyran-oside ring adopts a stable chair conformation.

| S-EPMC2969774 | biostudies-literature

4-Formyl-phenyl 2,3,4,6-tetra-O-acetyl-?-d-glucopyran-oside.

Project description:The pyran-oside ring in the title compound, C(21)H(24)O(11), has a chair conformation with the substituted benzene ring occupying an equatorial position. The crystal packing is dominated by C-H?O inter-actions that lead to the formation of supra-molecular layers in the ab plane.

| S-EPMC3099765 | biostudies-literature

3,4-Dicyano-phenyl 2,3,4,6-tetra-O-acetyl-?-d-glucopyran-oside.

Project description:The title compound, C(22)H(22)N(2)O(10), was prepared by the glycosidation method through nitrite displacement on substituted nitro-phthalonitrile. The mol-ecule contains a benzene ring, two nitrile groups and an acetyl-protected d-glucose fragment which adopts a chair conformation. The absolute configuration was determined by the use of d-glucose as starting material. All substituents of the protected sugar are in equatorial positions, with the exclusive presence of the ?-anomer. The crystal packing is stabilized by C-H?O and C-H?N hydrogen-bonding inter-actions.

| S-EPMC2915021 | biostudies-literature

4-(Dimeth-oxy-meth-yl)phenyl 2,3,4,6-tetra-O-acetyl-?-d-glucopyran-oside.

Project description:The enanti-omerically pure title compound, C(23)H(30)O(12), crystallizes in the chiral space group P2(1)2(1)2(1). The O-acetyl-ated-glucopyran-oside moiety adopts a chair conformation. Numerous C-H?O inter-actions as well as a C-H?? inter-action are present in the crystal structure.

| S-EPMC3344139 | biostudies-literature

4-Methoxy-phenyl 2,3,4,6-tetra-O-acetyl-1-thio-α-d-mannopyran-oside.

Project description:The title compound, C(21)H(26)O(10)S, was synthesized in a single step from mannose penta-acetate. The mol-ecular structure confirms the α configuration of the anomeric thioaryl substituent. Spectroscopic and melting-point data obtained for the title compound are in disagreement with those previously reported, indicating the previously reported synthesis [Durette & Shen (1980 ▶). Carbohydr. Res. 81, 261-274] to be erroneous. The crystal structure is stabilized by weak inter-molecular C-H⋯O hydrogen bonds.

| S-EPMC2962034 | biostudies-literature

n-Propyl 2,3,4,6-tetra-O-acetyl-?-d-glucopyran-oside.

Project description:THE TITLE COMPOUND [SYSTEMATIC NAME: (2R,3R,4S,5R,6R)-2-(acet-oxy-meth-yl)-6-propoxytetra-hydro-2H-pyran-3,4,5-triyl triacetate], C(17)H(26)O(10), was formed by a Koenigs-Knorr reaction of 2,3,4,6-tetra-O-acetyl-?-d-glucopyranosyl bromide and n-propanol. The central ring adopts a chair conformation. The crystal does not contain any significant inter-actions such as hydrogen bonds.

| S-EPMC3569225 | biostudies-literature

2,3,4,6-Tetra-O-acetyl-2-phthalimido-?-d-glucopyran-oside.

Project description:In the crystal structure of the title compound, C(24)H(27)NO(11), a substituted tetra-acetyl glucopyran-oside derivative, weak inter-molecular C-H?O hydrogen bonds link the mol-ecules into ribbons propagated in [010]. The d configuration has been attributed on the basis of the synthesis and the ? anomer has been determined from the structure.

| S-EPMC3011788 | biostudies-literature

Isopropyl 2,3,4,6-tetra-O-acetyl-?-d-glucopyran-oside.

Project description:The title compound, C(17)H(26)O(10), was formed by a Koenigs-Knorr reaction of 2,3,4,6-tetra-O-acetyl-?-d-glucopyranosyl bromide and propan-2-ol. The central ring adopts a chair conformation. The crystal does not contain any significant inter-molecular inter-actions.

| S-EPMC3569224 | biostudies-other

2,3,4,6-Tetra-O-acetyl-β-d-galacto-pyranosyl 2,3,4,6-tetra-O-acetyl-β-d-glucopyranosyl disulfide tetra-hydro-furan solvate.

Project description:The asymmetric unit of title compound, C(28)H(38)O(18)S(2)·C(4)H(8)O, comprises one disulfide-bridged sugar molecule and one solvent molecule. No significant differences in structural parameters are found between the present structure and the previously determined unsolvated form [Brito, López-Rodríguez, Bényei & Szilagyi (2006 ▶). Carbohydr. Res.341, 2967-2972]. The compounds are characterized by a compact structure with spatial proximity of the two pyranosyl rings. One of the carbonyl atoms is disordered over two sites [site occupancy = 0.69 (7) for major component] and the displacement parameters for the THF species are unsually large.

| S-EPMC2959895 | biostudies-literature

2,2,5,7,8-Penta-methyl-chroman-6-yl 2,3,4,6-tetra-O-acetyl-α-d-glucopyran-oside from synchrotron data.

Project description:The crystal structure of the title compound, C(28)H(38)O(11), solved and refined against synchrotron diffraction data, contains two formula units in the asymmetric unit. In both mol-ecules, the dihydro-pyran ring along with its methyl substituents is disordered and adopts two alternative half-chair conformations. The occupancy of the major conformers of the two mol-ecules refined to 0.858 (5) and 0.523 (5).

| S-EPMC3052099 | biostudies-literature

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