Preparation of polyhydroxyalkyl- and C-glycosylfuran derivatives from free sugars catalyzed by cerium(III) chloride in aqueous solution: an improvement of the Garcia González reaction
作者:Anup Kumar Misra、Geetanjali Agnihotri
DOI:10.1016/j.carres.2004.02.011
日期:2004.5
Unprotected aldose sugars react smoothly with 1,3-diones or beta-ketoesters in the presence of CeCl(3).7H(2)O in aqueous solution to produce polyhydroxylalkyl- and C-glycosylfuran derivatives in excellent yield. Operationally simple, mild neutral reaction conditions in aqueous solution is the key feature of this methodology.
An efficient method has been developed for the synthesis of Garcia Gonzalez polyhydroxyalkyl- and C-glycosylfurans in excellent yields from unprotected sugar aldoses with β-keto esters by Knoevenagel condensation in the presence of anhydrous iron(III) chloride. d-glucose - β-keto esters - Knoevenagel reaction - furans - carbohydrates
Synthesis, Biological Evaluation, WAC and NMR Studies of<i>S</i>-Galactosides and Non-Carbohydrate Ligands of Cholera Toxin Based on Polyhydroxyalkylfuroate Moieties
作者:Javier Ramos-Soriano、Ulf Niss、Jesús Angulo、Manuel Angulo、Antonio J. Moreno-Vargas、Ana T. Carmona、Sten Ohlson、Inmaculada Robina
DOI:10.1002/chem.201302786
日期:2013.12.23
The synthesis of several non‐carbohydrate ligands of choleratoxinbased on polyhydroxyalkylfuroatemoieties is reported. Some of them have been linked to D‐galactose through a stable and well‐tolerated S‐glycosidic bond. They represent a novel type of non‐hydrolyzable bidentate ligand featuring galactose and polyhydroxyalkylfuroic esters as pharmacophoric residues, thus mimicking the GM1 ganglioside
Hexose sugars undergo smooth coupling with 1,3-diketones and β-keto esters in the presence of 10 mol% of indium(III) chloride in water at 80 °C to furnish C-furyl glycosides in excellent yields, whereas pentose sugars produce trihydroxyalkyl-substituted furan derivatives with high selectivity. The reactions of cyclic ketones such as cyclohexane-1,3-dione or dimedone with D-glucose in acetonitrile at
己糖与 1,3-二酮和 β-酮酯在 10 mol% 氯化铟 (III) 的水中在 80 °C 存在下平滑偶联,以极好的产率提供 C-呋喃糖苷,而戊糖产生三羟基烷基-取代的呋喃衍生物具有高选择性。环己烷-1,3-二酮或二甲酮等环状酮与 D-葡萄糖在乙腈中于 80 °C 反应生成相应的四氢苯并呋喃糖苷衍生物。