Crystal structure of 6-deoxy-α-L-psicofuranose
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چکیده
منابع مشابه
Crystal structure of 6-deoxy-α-l-psicofuranose
The title compound, C6H12O5, was crystallized from an aqueous solution of 6-de-oxy-l-psicose (6-de-oxy-l-allulose, (3S,4S,5S)-1,3,4,5-tetra-hydroxy-hexan-2-one), and the mol-ecule was confirmed as α-furan-ose with a (3) T 4 (or E 4) conformation, which is a predominant tautomer in solution. This five-membered furan-ose ring structure is the second example in the field of the 6-de-oxy-ketohexose...
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A 6-deoxy-α-L-talopyranoside acceptor was readily prepared from methyl α-L-rhamnopyranoside and glycosylated with thiogalactoside donors using NIS/TfOH as the promoter to give good yields of the desired a-linked disaccharide (69-90%). Glycosylation with a 2-azido-2-deoxy-D-glucosyl trichloroacetimidate donor was not completely stereoselective (α:β = 6:1), but the desired a-linked disaccharide c...
متن کامل6-Deoxy-α-l-talopyranose
X-ray crystallography showed that the title compound, C(6)H(12)O(5), crystallizes in the α-pyran-ose form with the six-membered ring in a chair conformation. The crystal structure exists as a three-dimensional hydrogen-bonded network of mol-ecules with each mol-ecule acting as a donor and aceptor for four hydrogen bonds. The absolute configuration was determined by the use of l-fucose as starti...
متن کاملBiological mechanisms involved in the formation of deoxy sugars. VII. Biosynthesis of 6-deoxy-L-talose.
The over-all reaction yielding tbymidine diphospho (TDP)6-deoxy-L-talose was first established using crude enzyme preparations catalyzing Reactions 1,2, and 3. Unambiguous proof for the formation of the L isomer of 6-deoxytalose was provided by radioisotope dilution experiments. Purification of sonic extracts of E. coli 045 into fractions catalyzing individual steps of the above scheme revealed...
متن کاملCrystal Structure of Methyl 4-amino-4-cyano-4,6-dideoxy-2,3- O-isopropylidene-α-L-talopyranoside
The structure of methyl 4-amino-4-cyano-4,6-dideoxy-2,3-O-isopropylidene-α-Ltalopyranoside was established by X-ray analysis confirming a talo configuration at C-4 and suggesting a C4 conformation of the pyranose ring. The values of relevant torsion angles and calculated puckering parameters revealed a distortion into the direction of E conformation, thus indicating a flattening at C-2.
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ژورنال
عنوان ژورنال: Acta Crystallographica Section E Crystallographic Communications
سال: 2015
ISSN: 2056-9890
DOI: 10.1107/s2056989015022215