Golden solution: A neutral solution of AuBr3, containing [AuBr2(OH)2]− in equilibrium with [AuBr3(OH)]− and [AuBr4]−, promotes the chemoselective hydrolysis of robust oximes into carbonyl compounds without racemization (see scheme). The food additive diacetyl acts as a NH2OH‐trapping agent, thus avoiding the formation of gold nanoparticles and allows the reaction to run catalytically.
Indium(III) Triflate: A Highly Efficient Catalyst for Reactions of Sugars<sup>[1]</sup>
作者:Santosh Kumar Giri、Monika Verma、K. P. Ravindranathan Kartha
DOI:10.1080/07328300802458970
日期:2008.12.11
Indium(III) trifluoromethanesulfonate has been found to be extremely efficient in catalyzing acyl transfer reactions of various carbohydrates and their derivatives. Selective acetolyses of certain benzyl ethers/isopropylidene acetals of sugars have been possible using In(OTf)3 in Ac2O (neat). Reaction of the per-O-acetate of 2-deoxy-2-phthalimido-D-glucose with benzyl mercaptan in the presence of In(OTf)3
Determination of the absolute configuration of monosaccharides by 1H NMR spectroscopy of their per-O-(S)-2-methylbutyrate derivatives
作者:William S. York、Stephen Hantus、Peter Albersheim、Alan G. Darvill
DOI:10.1016/s0008-6215(97)00050-5
日期:1997.5
Abstract An empirical method was developed to determine the absoluteconfiguration of monosaccharides, based on high-field 1H NMR spectroscopy of their per- O-(S)-2-methylbutyrate (SMB) derivatives. The SMB derivatives of the D and L forms of a given monosaccharide are diastereomers, allowing them to be distinguished on the basis of differences in their 1H NMR chemical shifts. The reproducibility of
Neuroprotective activity of different monosaccharide‐modified gastrodin analogs
作者:Kun‐Lun Xu、Lan Yu
DOI:10.1002/jccs.201900223
日期:2020.7
Gastrodin is a very important and well‐known bioactive glycoside compound in Chinese medicine. It is also known as a drug with neuroprotective function. Here, a practical diversified synthesis of a series of gastrodinanalogs was reported, which involved four‐step procedures consisting of bromination, oxidation, etherification, and reduction. Various gastrodinanalogs were obtained in good yields.
structures of CsCl- d -arabinose and CsCl- l -arabinose complexes, two kinds of Cs+ ions coexist in the structures. Cs1 is 10-coordinated with two chloride ions and eight hydroxyl groups from five arabinose molecule; Cs2 is 9-coordinated to three chloride ions and six hydroxyl groups from five arabinose molecules. Two coordination modes of arabinose coexist in the structures. α- d -arabinopyranose and α- l