Showing papers on "Aldose published in 1987"
TL;DR: In this paper, pairs of enantiomers of nine aldoses were separated by gas-liquid chromatography on an OV-17 capillary column as the trimethylsilyl ethers of methyl 2- (polyhydroxyalkyl) -thiazolidine-4 (R) -carboxylates.
Abstract: Pairs of enantiomers of nine aldoses were separated by gas-liquid chromatography on an OV-17 capillary column as the trimethylsilyl ethers of methyl 2- (polyhydroxyalkyl) -thiazolidine-4 (R) -carboxylates, which were obtained by the reaction of aldoses with L-cysteine methyl ester. This method was applied to the determination of the absolute configurations of the component monosaccharides of a Thladiantha saponin.
530 citations
Patent•
29 Jan 1987TL;DR: In this article, a process for the selective oxidation of di-, tri-, oligo- and polysaccharides comprising a reducing terminal function of the aldose type into polyhydroxycarboxylic acids, wherein the oxidation is carried out in an alkaline medium by means of an oxygen-containing gas, in the presence of a noble metal based catalyst selected from the group constituted by palladium, platinum, rhodium and osmium and fixed on an inert support, said catalyst being "doped" with one or several metals, or promoters, of Groups
Abstract: Process for the selective oxidation of di-, tri-, oligo- and polysaccharides comprising a reducing terminal function of the aldose type into polyhydroxycarboxylic acids, wherein the oxidation is carried out in an alkaline medium by means of an oxygen-containing gas, in the presence of a noble metal based catalyst selected from the group constituted by palladium, platinum, rhodium and osmium and fixed on an inert support, said catalyst being "doped" with one or several metals, or promoters, of Groups IV, V or VI of the Periodic Table.
143 citations
99 citations
91 citations
49 citations
TL;DR: The enantiospecific total synthesis of (-)-anamarine, starting from D-glucose, has been carried out in this article, where the enantio-specific total synthesis was carried out starting from
36 citations
TL;DR: In this article, a diastereogenic addition of 2-trimethylsilylthiazole (1) to the side-chain aldehyde and unmasking the formyl group from thiazole ring was carried out for homologation of the title dialdoses.
33 citations
28 citations
TL;DR: In this paper, the synthesis of diorganotincarbohydrates is reported, which is consistent with the presence of tin-carbohydrate oxygen bonds in the compounds and with a trigonal bipyramidal arrangement of two alkyl and three O-containing groups about the tin atoms.
27 citations
TL;DR: Mercaptolyses of the pentoses and hexoses with n-alkyl thiols having chain lengths ≥ C6 gives mesogenic aldose di-n-alksyl dithioacetals 7-12.
Abstract: Les mercaptolyses des pentoses et hexoses avec des n-alkylthiols ayant des chaines aliphatiques de plus de 6 carbones produisent des aldoses di-n-alkyl dithioacetals mesogeniques
26 citations
TL;DR: It is shown that aldose consumption without concurrent acid production is due to formation of the corresponding lactone, the hydrolysis of which is pH-dependent.
Abstract: A continuous culture study was made of the energetics of oxidation of various aldose sugars by Acinetobacter calcoaceticus LMD 79.41. The consumption of aldoses during carbon- and energy-limited growth of the organism on mixtures of acetate and an aldose was independent of the pH of the culture. Acid production, however, was strongly dependent on this parameter. It is shown that aldose consumption without concurrent acid production is due to formation of the corresponding lactone, the hydrolysis of which is pH-dependent. The cell yield of A. calcoaceticus on mixtures of acetate and glucose or xylose was much higher than during growth on acetate alone. This increase in cell yield was, however, dependent on the pH of the culture. Only at pH values which permitted a high rate of lactone hydrolysis an enhancement of the cell yield was observed. These results suggest that lactone hydrolysis has an important bearing on the efficiency of periplasmic oxidation of aldoses in bacteria.
TL;DR: Synthese des diastereoisomeres de dimethyl-2,4 hexene-5diol-1,3 and benzyloxy-5 dihydroxy-2.4,6 trityloxy-7 œnanthate de methyle as mentioned in this paper
Abstract: Synthese des diastereoisomeres de dimethyl-2,4 hexene-5diol-1,3 et de benzyloxy-5 dihydroxy-2,3 trimethyl-2,4,6 trityloxy-7 œnanthate de methyle
TL;DR: In this paper, the syntehsis and characterization of previously unknown B -aryl- and B -alkyl-1,3,2-dioxaboroles is reported.
TL;DR: Condensation of 2,4-di-O -acetyl-3,6-di -O -methyl-α-d -glucopyranosyl bromide with either allyl or benzyl gave the title oligosaccharides in excellent yields.
TL;DR: In this paper, (6R,7S,8aR)-dihydroxyindolizidine (1) and (6 R,7R,8S, 8aR)trihydroxyindoline (2) from readily available methyl 2-azido-4,6-Obenzylidene-2-deoxy-α-D-altropyranoside (5) are described.
TL;DR: In this article, a pseudo-α-D-glucopyranose was obtained from a 6-deoxyhex-5-enopyransose derivative as starting material.
Abstract: Crystalline pseudo-α-D-glucopyranose, a compound of potential biochemical interest, has been obtained for the first time from a 6-deoxyhex-5-enopyranose derivative as starting material.
TL;DR: Aldoses are epimerized at C-2 by combinations of certain metals (Ni2+, Co2+, Ca2+, and Sr2+) and diamines (N, N,N,N′-trimethylethylenediamine and N, N.N.N′, N′-tetramethylthyleniamine), and a 13C n.m.r.
Abstract: Aldoses are epimerized at C-2 by combinations of certain metals (Ni2+, Co2+, Ca2+, and Sr2+) and diamines (N,N,N′-trimethylethylenediamine and N,N,N′,N′-tetramethylethylenediamine), and a 13C n.m.r. study reveals that a novel rearrangement of the carbon skeleton, the exchange of C-1 and C-2 atoms by inversion of the C-1–C-2 aldose fragment, is involved in this reaction.
TL;DR: A synthesis of 5S-hydroxy-14,15-LTA4 10 an intermediate in the biosynthesis of the lipoxins is described.