title: Study of 1-deoxy-1-(indol-3-yl)-L-sorbose, 1-deoxy-1-(indol-3-yl)-L-tagatose, and their analogs.
abstract: Alkaline degradation of the ascorbigen 2-C-[(indol-3-yl)methyl]-alpha-L-xylo-hex-3-ulofuranosono-1,4-lactone (1a) led to a mixture of 1-deoxy-1-(indol-3-yl)-L-sorbose (2a) and 1-deoxy-1-(indol-3-yl)-L-tagatose (3a). The mixture of diastereomeric ketoses underwent acetylation and pyranose ring opening under the action of acetic anhydride in pyridine in the presence of 4-dimethylaminopyridine (DMAP) with the formation of a mixture of (E)-2,3,4,5,6-penta-O-acetyl-1-deoxy-1-(indol-3-yl)-L-xylo-hex-1-enitol (4a) and (E)-2,3,4,5,6-penta-O-acetyl-1-deoxy-1-(indol-3-yl)-L-lyxo-hex-1-enitol (5a), which were separated chromatographically. Deacetylation of 4a or 5a afforded cyclised tetrols, tosylation of which in admixture resulted in 1-deoxy-1-(indol-3-yl)-3,5-di-O-tosyl-alpha-L-sorbopyranose (12a) and 1-deoxy-1-(indol-3-yl)-4,5-di-O-tosyl-alpha-L-tagatopyranose (13a). Under alkaline conditions 13a readily formed 2-hydroxy-4-hydroxymethyl-3-(indol-3-yl)cyclopenten-2-one (15a) in 90% yield. Similar transformations were performed for N-methyl- and N-methoxyindole derivatives.
authors.affiliation: Gause Institute of New Antibiotics, Russian Academy of Medical Sciences, B. Pirogovskaya 11, Moscow 119992, Russia.
authors.forename: Sergey N
authors.initials: SN
authors.lastname: Lavrenov
authors.forename: Alexander M
authors.initials: AM
authors.lastname: Korolev
authors.forename: Marina I
authors.initials: MI
authors.lastname: Reznikova
authors.forename: Andrey V
authors.initials: AV
authors.lastname: Sosnov
authors.forename: Maria N
authors.initials: MN
authors.lastname: Preobrazhenskaya
mesh_terms: D000468:Alkalies; D001205:Ascorbic Acid / Q000031:analogs & derivatives* / Q000737:chemistry; D006601:Hexoses / Q000138:chemical synthesis*; D007211:Indoles / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D013013:Sorbose / Q000031:analogs & derivatives* / Q000138:chemical synthesis
chemical_list: D000468:Alkalies; D006601:Hexoses; D007211:Indoles; C053152:ascorbigen; D013013:Sorbose; D001205:Ascorbic Acid; C030192:tagatose