A new look at acid catalyzed deacetylation of carbohydrates: A regioselective synthesis and reactivity of 2-O-acetyl aryl glycopyranosides
作者:Elena V. Stepanova、Marina O. Nagornaya、Victor D. Filimonov、Rashid R. Valiev、Maxim L. Belyanin、Anna K. Drozdova、Victor N. Cherepanov
DOI:10.1016/j.carres.2018.02.003
日期:2018.3
groups of per - acetylated aryl glycosides have different reactivity during the acidic deacetylation using HCl/EtOH in CHCl3, which leads to preferential deacetylation at O-3, O-4 and O-6. Thereby, the one-step preparation of 2-O-acetyl aryl glycosides with simple aglycon was accomplished for the first time. It was proved that the found reagent is to be general and unique for the preparation of series of
Selective demethylation of <i>O</i>-aryl glycosides by iridium-catalyzed hydrosilylation
作者:Caleb A. H. Jones、Nathan D. Schley
DOI:10.1039/d1cc00496d
日期:——
The cleavage of alkyl ethers by hydrosilylation is a powerful synthetic tool for the generation of silyl ethers. Previous attempts to apply this transformation to carbohydrate derivatives have been constrained by poor selectivity and preferential reduction of the anomeric position. O-Aryl glycosides are found to be stable under iridium- and borane-catalyzed hydrosilylation conditions, allowing for
Synthesis and structure of tricarbonyl(η<sup>6</sup>-arene)chromium complexes of phenyl and benzyl D-glycopyranosides
作者:Thomas Ziegler、Ulrich Heber
DOI:10.3762/bjoc.8.118
日期:——
A series of 15 glycoside-derived tricarbonyl(eta(6)-arene)chromiumcomplexes were prepared in 19-87% yield by heating fully acetylated or methylated aryl O-, S-, N- and C-glycosides of D-glucopyranose and D-mannopyranose with hexacarbonylchromium. All tricarbonylchromium complexes were fully characterized. The structures of nine crystalline complexes were determined by X-ray diffraction, revealing
通过加热 D-吡喃葡萄糖的完全乙酰化或甲基化的芳基 O-、S-、N-和 C-糖苷,以 19-87% 的产率制备了一系列 15 D-吡喃甘露糖与六羰基铬。所有三羰基铬配合物都得到了充分表征。通过 X 射线衍射确定了九种晶体复合物的结构,揭示了不寻常的分子内和分子间非经典氢键。
The Cleavage of Glycosides by Catalytic Hydrogenation<sup>1</sup>
作者:Nelson K. Richtmyer
DOI:10.1021/ja01322a060
日期:1934.7
Kariyone et al., Yakugaku Zasshi/Journal of the Pharmaceutical Society of Japan, 1952, vol. 72, p. 13