Aldose

About: Aldose is a research topic. Over the lifetime, 1270 publications have been published within this topic receiving 27197 citations. The topic is also known as: aldoses.

Evidence for the C-N Bond Formation Between An Aldose and Ethylenediamine on Cobalt(III) Complexes. Deuterium Isotope Effects on Carbon-13 NMR Chemical Shifts

Abstract: We have already reported the synthesis and characterization of Co(III) complexes containing an N-glycoside derived from ethylenediamine (en) and an aldose. 1 In the report, the formation of a new C-N bond has been presumed according to the chemical shifts of the 13C signals originated from the en units in their 13C NMR spectra: one of the signals assigned to the en carbon atoms, which is presumably corresponding to the carbon atom adjacent to the glycosidic nitrogen, appears at 7–8 ppm downfield from the other three.

New osazone diagram for determination of two aldoses and a ketose that form identical osazone

Abstract: A new and interesting osazone diagram was presented for determination and identification of a pair aldoses and a ketose that makes the same osazone This chart facilitated the finding any aldose and/or ketose yielded the same osazone

Formation of Tetrahydrofurans Using aldehydo-Aldose Derivatives as Substrates

Abstract: Reaction of allylsilane with 2, 3; 4, 5-di- O-isopropylidene-aldehydo-D-arabinose in the presence of boron trifluoride etherate afforded an unexpected product, which was identified as a tetrahydrofuran derivative, as a major component along with a small amount of homoallyl alcohol. This tetrahydrofuran formation probably proceeds via cyclization of the β-silyl cation intermediate accompanied by migration of the isopropylidene group. The scope of this reaction was investigated : When 2, 3-O-isopropylidene derivatives of D-erythrose, D-ribose, L-rhamnose, and D-mannose were used as the aldehyde in the reaction of allylsilane, the tetrahydrofuran derivatives were obtained in moderate yields, whereas aldehydes derived from D-xylose, 6-deoxy-D-glucose, and D-glucose gave the homoallyl alcohols as major products. Similar cyclization proceeded employing disubstituted terminal olefins, vinyl ethers, and vinyl sulfides instead of allylsilane to afford the corresonding tetrahydrofurans in good to high yields. Especially, the reaction using β-substituted vinyl ethers and sulfides provided a stereoselective route to 2-C-substituted 2-deoxyfuranosides, which were utilized for synthesizing 2-C-substi-tuted 2-deoxyhexoses and 2'-substituted 2'-deoxynucleosides.

Method for producing benzylated fructofuranose derivative and benzylated aldose derivative by acid hydrolysis of perbenzylated sucrose oligosaccharide

Abstract: PROBLEM TO BE SOLVED: To provide a method for efficiently producing 3-O-(2,3,4,6-tetra-O-benzyl-α-D-glucopyranosyl)-1,4,6-tri-O-benzyl-D-fructofuranose, 6-O-(2,3,4,6-tetra-O-benzyl-α-D-galactopyranosyl)-2,3,4-tri-O-benzyl-D-glucopyranose, and a benzylated D-fructofuranose derivative and a benzylated aldose derivative containing di- or multi-saccharide oligosaccharide by the selective acid hydrolysis of a fructofuranosyl bond of a perbenzylated sucrose oligosaccharide. SOLUTION: A fructofuranosyl bond of a perbenzylated sucrose oligosaccharide is selectively hydrolyzed by using 75% aqueous solution of sulfuric acid in dioxane. COPYRIGHT: (C)2008,JPO&INPIT

Preparation of aldoses and their derivatives by hydrogen peroxide oxidation of alpha hydroxy acids using tungsten or molybdenum salt catalyst

Abstract: Aqueous phase preparation of an aldose or aldose derivative having n carbon atoms in the hydrocarbon chain, by contacting an osic acid (I) having n+1 carbon atoms and at least one alpha -hydroxy acid group, or a salt of this, with hydrogen peroxide and a tungsten or molybdenum salt. The reaction is carried out at pH 1-8 and at 0 - 100 deg C, preferably 20 - 90 deg C, using 0.001 - 20% by weight of the metal salt calculated on weight of (I), and 1 - 500 mole %, especially 50 - 300 mole % of hydrogen peroxide calculated on moles of (I).