fast and efficient acylation of carbohydrate derivatives and free sugars using a stoichiometric quantity of acylating agents in the presence of sulfamicacid, an environmentally benign catalyst, under organic solvent-freeconditions is reported. Excellent yields in the selective acylation and sulfation of carbohydrate derivatives have also been achieved using sulfamicacid as the catalyst. The reaction
Fast oxidation of thioglycosides to glycosyl sulfones using KMnO4/CuSO4·5H2O under neutral reaction conditions
作者:Geetanjali Agnihotri、Anup Kumar Misra
DOI:10.1016/j.carres.2005.11.025
日期:2006.2
A rapid oxidation of thioglycosides to glycosyl sulfones has been achieved using a combination of KMnO4 and CuSO(4)center dot 5H(2)O in acetonitrile and water. This reaction protocol has many advantages compared to other methods available for this transformation, including compatibility with acid and base labile functional groups used for the protection of carbohydrates, high yields, fast reaction times, and moderate reaction temperatures. The yields obtained were excellent in all cases. (c) 2005 Elsevier Ltd. All rights reserved.
Fast and selective oxidation of thioglycosides to glycosyl sulfoxides using KF/m-CPBA
作者:Geetanjali Agnihotri、Anup Kumar Misra
DOI:10.1016/j.tetlet.2005.09.132
日期:2005.11
A very fast and selective oxidation of thioglycosides to glycosyl sulfoxides has been achieved using KF/m-CPBA in CH3CN-H2O. This protocol has many advantages compared to the currently available methodologies for this transformation in terms of selectivity, yield, reaction time, control of temperature, etc. The yields obtained were excellent in all cases. (c) 2005 Elsevier Ltd. All rights reserved.