Directly Linked C-Disaccharides: Structures of Two 3,4-Dihydro-2H-pyran Derivatives

Autor:	Mario Nardelli, Sandra Ianelli
Rok vydání:	1996
Předmět:	chemistry.chemical_compound chemistry Pyran Hydrogen bond Stereochemistry Acetal Diastereomer Molecule General Medicine Ring (chemistry) Thiazole General Biochemistry Genetics and Molecular Biology Cycloaddition
Zdroj:	Acta Crystallographica Section C Crystal Structure Communications. 52:2853-2857
ISSN:	0108-2701
DOI:	10.1107/s010827019600827x
Popis:	Analysis of the crystal structures of the two diastereomeric C-disaccharides, (2R,4R)-4-(1,2;3,4-di-O-isopiopylidene-α-D-galacto-1,5-pyranose-5-yl)2-ethoxy-6-(2-thiazolyl)-3,4-dihydro-2H-pyran, C 21 H 29 NO 7 S, (3), and (2R,4S)-4-(1,2;3,4-di-O-isopropylidene-α-D-galacto-1,5-pyranose-5-yl)-2-ethoxy-6-formyl-3,4-dihydro-2H-pyran, C 19 H 28 O 8 , (4), allows the definition of the absolute configurations of the products of the cycloaddition reaction between 1-oxa-1,3-butadiene and ethyl vinyl ether. The relevant conformational aspects of the two molecules are discussed. In the crystals of (3), a water molecule participates in hydrogen bonds to the thiazole N atom and an O atom of a dioxapentane ring of the sugar moiety within the same molecule.
Databáze:	OpenAIRE
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