The influence of boric acid on the acetylation of aldoses: ‘one-pot’ syntheses of penta-O-acetyl-β-D-glucofuranose and its crystalline propanoyl analogue
作者:Richard H. Furneaux、Phillip M. Rendle、Ian M. Sims
DOI:10.1039/b002841j
日期:——
When glucose and boric acid are heated in acetic acid a soluble compound forms from which, with acetic anhydride and catalytic amounts of sulfuric acid, a mixture consisting of >90% of the glucofuranose per-acetates (αâ¶Î² ratio 1â¶1.8) is obtained in high yield. In the absence of the sulfuric acid partial acetylation takes place and penta-O-acetyl-β-D-glucofuranose (αâ¶Î² ratio 1â¶52) is obtainable in good yield by removal of boric acid and completion of the esterification by addition of acetic anhydride and pyridine. A new, crystalline glucofuranose, penta-O-propanoyl-β-D-glucofuranose, is obtained in 58% yield in a âone-potâ procedure using boric acid.
The effects of boric acid on the acid-catalysed acetylation of other aldo-hexoses and -pentoses suggest that the synthesis of furanosyl per-esters could be successful with xylose and idose as well as with glucose.
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[EN] CARBON MONOXIDE-RELEASING MOLECULES AND THERAPEUTIC APPLICATIONS THEREOF<br/>[FR] MOLÉCULES LIBÉRANT DU MONOXYDE DE CARBONE ET LEURS APPLICATIONS THÉRAPEUTIQUES
申请人:UNIV GEORGIA STATE RES FOUND
公开号:WO2018093924A1
公开(公告)日:2018-05-24
Carbon monoxide-releasing organic molecules are described herein. The molecules can be synthesized prior to administration (e.g., ex vivo) or formed in vivo. In those embodiments where the molecules are formed in vivo, reactants are administered under physiological conditions and undergo a cycloaddition reaction to form a product which releases carbon monoxide. In applying such reactions for therapeutic applications in vivo, the cycloaddition and CO release typically occur only under near-physiological or physiological conditions. For example, in some embodiments, the cycloaddition reaction and/or release of carbon monoxide occur at a temperature of about 37° C and pH of about 7.4. Pharmaceutical compositions and methods for release carbon monoxide are also described.
FromD-Glucose to Biologically PotentL-Hexose Derivatives: Synthesis of ?-L-Iduronidase Fluorogenic Detector and the Disaccharide Moieties of Bleomycin A2 and Heparan Sulfate
A novel and convenient route for the synthesis of biologically potent and rare L-hexose derivatives from D-glucose is described. Conversion of diacetone-alpha-D-glucose (14) into 1,2:3,5-di-O-isopropylidene-beta-L-idofuranose (19) was efficiently carried out in two steps. Orthogonal isopropylidene rearrangement of compound 19 led to 1,2:5,6-di-O-isopropylidene-beta-L-idofuranose (27), which underwent
Efficient Synthesis of 1,2,3,4,6-Penta-<i>O</i>-acetyl-<scp>L</scp>-idopyranose
作者:Shang-Cheng Hung、Chien-Sheng Chen
DOI:10.1002/jccs.200000173
日期:2000.12
An efficientsynthesis of 1,2,3,4,6-penta-O-acetyl-L-idopyranose 2 from 3,5-O-benzylidene-1,2-O-isopropylidene-α-D-glucofuranose in five steps in 45% overall yield via hydroboration of enol ether, hydrolysis of L-idofuranosyl sugar and acetolysis of 1,6-anhydro-β-L-idopyranose as key steps is described here.
Diastereoselective Synthesis of All Eight <scp>l</scp>-Hexoses from <scp>l</scp>-Ascorbic Acid
作者:Ludmila Ermolenko、N. André Sasaki
DOI:10.1021/jo0521192
日期:2006.1.1
A novel versatile method for the synthesis of alleight diastereomerically pure l-hexoses was developed. l-Ascorbicacid was converted to two diastereomers A. These α-hydroxy esters were transformed into four γ-alkoxy-α,β-unsaturated esters C via the intermediates B and subsequent Wittig olefination reactions. Each one of compounds C was subjected to dihydroxylation to provide a set of two diols D