Topic
Pyranose
About: Pyranose is a research topic. Over the lifetime, 1619 publications have been published within this topic receiving 35348 citations. The topic is also known as: pyranoses & hexopyranose.
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TL;DR: In this paper, a branched-chain aldose bearing an azido group at the C-2 position provides access to the corresponding 1-deoxy-1-azido- and 1 -deoxy -1-amino ketoses in a single step via stereospecific isomerization.
Abstract: A branched-chain aldose bearing an azido group at the C-2 position provides access to the corresponding 1-deoxy-1-azido- and 1-deoxy-1-amino ketoses in a single step via stereospecific isomerization. The isomerization exploited the catalytic effect of molybdate ions and microwave irradiation. The structures of the products were analyzed by NMR spectroscopy, IR, HRMS spectrometry and quantum-chemical DFT calculations. DFT-computed proton-proton coupling constants of the prepared Amadori ketose 1-deoxy-1-amino- d - gluco -heptulose were found to be comparable with the experimentally obtained coupling constants and were in agreement with the 4 C 1 pyranose form in aqueous solution at room temperature.
8 citations
TL;DR: In this paper, a mixture of methyl-4,6-dideoxy-4-iodo-2,3-O-isopropylidene-L-rhamnopyranoside (I) and methyl-5, 6-didoxy-5-iodos-2.3 OISOPPARYLIDENE-β-D-allofuranosi (III) was obtained in the ratio of 13:14:1.
8 citations
TL;DR: In this article, the pyranose ring of 2.3,4-tri-O -acetyl N -(diacetylamino)-β-d -glucopyranurono-1,6,1-lactam derivative was examined by 1 H- and 13 C-n.r.
8 citations
8 citations
TL;DR: The structure of condensation products of D-lactose and D-maltose with sulfanylacetic, 3-sulfanylpropanoic, and 2-Sulfanylbenzoic acid hydrazides has been studied 1H and 13C NMR spectroscopy as mentioned in this paper.
Abstract: The structure of the condensation products of D-lactose and D-maltose with sulfanylacetic, 3-sulfanylpropanoic, and 2-sulfanylbenzoic acid hydrazides has been studied 1H and 13C NMR spectroscopy. The condensation products obtained from the disaccharides and sulfanylacetohydrazide and 3-sulfanylpropanehydrazide have pyranose structure in the crystalline state, whereas those derived from 2-sulfanylbenzohydrazide have cyclic 1,3,4-benzothiadiazepine structure in crystal. All condensation products in solutions in most solvents (D2O, DMF-d7, DMSO-d6) exist as equilibrium mixtures of linear and cyclic pyranose and 1,3,4-benzothiadiazepine tautomers.
8 citations