title: Preparation and structure determination of two sugar amino acids via corresponding hydantoin derivatives.
abstract: (4R)-2,3-O-Isopropylidene-methylspiro[4,6-dideoxy-alpha-L-lyxo+ ++-hexopyranosid-4,5'-imidazolidin]-2',4'-dione and (4R)-2,3-O-isopropylidene-methylspiro[4,6-dideoxy-beta-D-ribo-h exopyranosid-4,5'-imidazolidin]-2',4'-dione were prepared under various reaction conditions starting from methyl 6-deoxy-2,3-O-isopropylidene-alpha-L-lyxo-hexopyranosid-4-++ +ulose. Corresponding alpha-amino acids methyl (4R)-4-amino-4-C-carboxy-4,6-dideoxy-alpha-L-lyxo-hexopyranosid e and methyl (4R)-4-amino-4-C-carboxy-4,6-dideoxy-beta-D-ribo-hexopyranoside were obtained from the above hydantoins by selective acid hydrolysis of the isopropylidene group, followed by basic hydrolysis of the hydantoin ring. The crystal structures of both hydantoin derivatives are also presented.
authors.affiliation: Institute of Chemistry, Slovak Academy of Sciences, Bratislava, Slovak Republic. chemmiro@savba.sk
authors.forename: M
authors.initials: M
authors.lastname: Koós
authors.forename: B
authors.initials: B
authors.lastname: Steiner
authors.forename: V
authors.initials: V
authors.lastname: Langer
authors.forename: D
authors.initials: D
authors.lastname: Gyepesová
authors.forename: M
authors.initials: M
authors.lastname: Durík
mesh_terms: D000596:Amino Acids / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006827:Hydantoins / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry; D008279:Magnetic Resonance Imaging; D015394:Molecular Structure; D009005:Monosaccharides / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D000596:Amino Acids; D006827:Hydantoins; D007093:Imidazoles; D009005:Monosaccharides