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Phenyl 4,6-di-O-acetyl-2,3-dide-oxy-1-thio-?-d-erythro-hex-2-enopyran-oside.

ABSTRACT: The pyranosyl ring in the title compound, C(16)H(18)O(5)S, adopts an envelope conformation, with the acetyl groups in equatorial positions. In the crystal, weak C-H?O inter-actions link the molecules into chains.

SUBMITTER: Kinfe HH

PROVIDER: S-EPMC3247579 | biostudies-literature | 2011 Nov

REPOSITORIES: biostudies-literature

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Phenyl 4,6-di-O-acetyl-2,3-dide-oxy-1-thio-α-d-erythro-hex-2-enopyran-oside.

Kinfe Henok H HH Mebrahtu Fanuel M FM Muller Alfred A

Acta crystallographica. Section E, Structure reports online 20111005 Pt 11

The pyranosyl ring in the title compound, C(16)H(18)O(5)S, adopts an envelope conformation, with the acetyl groups in equatorial positions. In the crystal, weak C-H⋯O inter-actions link the molecules into chains. ...[more]

PMID: 22219884

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(-)-Benzyl 2,3-dide-oxy-?-d-erythro-hex-2-eno-pyran-oside.

Project description:In the title compound, C13H16O4, the six-membered ring of the sugar moiety shows a half-chair conformation. In the crystal, mol-ecules are connected via O-H?O hydrogen bonds, forming columns around twofold screw axes along the b-axis direction. There is a disorder of the benz-yloxy group, which has two possible orientations with the phenyl group lying on a common plane [site-occupancy factors = 0.589?(9) and 0.411?(9)].

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Prop-2-yn-1-yl 4,6-di-O-acetyl-2,3-dide-oxy-α-d-erythro-hex-2-enopyran-o-side.

Project description:The absolute structure of the title compound, C(13)H(16)O(6), was determined. The pyranosyl ring adopting an envelope conformation. The acetyl groups are located in equatorial positions. The crystal structure features weak C-H⋯O inter-actions.

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Phenyl 2,3-O-isopropyl-idene-1-thio-α-d-rhamnopyran-oside.

Project description:In the title compound, C(15)H(20)O(4)S, a dioxolane ring is fused to the pyran ring of the sugar which carries a thio-phenyl substituent on the anomeric C atom. The dioxolane ring adopts an envelope conformation and the pyran ring system a distorted (4)C(1) chair. The structure is stabilized by O-H⋯O hydrogen bonds, forming centrosymmetric dimers that generate an R(2) (2)(10) ring motif. Additional C-H⋯O inter-actions 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.

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4-Methoxy-phenyl 2,3,4,6-tetra-O-acetyl-1-thio-?-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 ? 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.

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Phenyl 2-amino-N,6-O-dibenzyl-2,3-N,O-carbonyl-2-de-oxy-1-thio-?-d-glucopyran-oside.

Project description:In the crystal structure of the title compound, C(27)H(27)NO(5)S, the pyran-ose ring adopts a (4)C(1) chair conformation with puckering parameters Q = 0.639?(2)?Å, ? = 174.11?(18) and ? = 256?(2)°. The presence of the 2,3-trans-oxazolidinone fixes the conformation of the pyran-ose ring. The phenyl group attached to the S atom and the benzyl group bonding to the N atom are each disordered over two positions with site occupancies of 0.624?(3):0.376?(3) and 0.526?(3):0.474?(3), respectively. An inter-molecular O-H?O hydrogen bond is observed.

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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.

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Monoclinic polymorph of 2,5-dide-oxy-2,5-epithio-1,3:4,6-bis-O-[(R)-phenyl-methyl-ene]-l-iditol.

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Project description:In the title compound, C(23)H(23)NO(6)S, the plane of the N-phthalimido group makes a dihedral angle of 67.4?(1)° with the least square plane of the sugar ring defined by the C2, C3, C5 and O5 atoms using standard glucose nomenclature. The thio-ethyl group has the exo-anomeric conformation. In the crystal, inter-molecular hydrogen bonds involving the hy-droxy groups and the carbonyl O atoms of adjacent N-phthalimido groups form chains parallel to the b axis. The chains are further stabilized by C-H?? inter-actions.

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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.

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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.

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