Synthesis of 2-Nitroglycals from Glycals Using the Tetrabutylammonium Nitrate–Trifluoroacetic Anhydride–Triethylamine Reagent System and Base-Catalyzed Ferrier Rearrangement of Acetylated 2-Nitroglycals
作者:Suresh Dharuman、Preeti Gupta、Pavan K. Kancharla、Yashwant D. Vankar
DOI:10.1021/jo401165y
日期:2013.9.6
A reagent system comprising tetrabutylammonium nitrate–trifluoroacetic anhydride–triethylamine has been developed for the synthesis of 2-nitroglycalsfrom various protected glycals. The base-catalyzed Ferrier rearrangement on tri-O-acetylated 2-nitroglycals has been reported for the first time. Reactivity of these nitroacetates and associated selectivity has been examined, and some of the products
N-Heterocyclic Carbene Catalyzed <i>C</i>-Glycosylation: A Concise Approach from Stetter Reaction
作者:Seenuvasan Vedachalam、Shi Min Tan、Hui Ping Teo、Shuting Cai、Xue-Wei Liu
DOI:10.1021/ol202959y
日期:2012.1.6
Described herein is the first example of an organocatalytic approach for acylanion addition to the anomeric carbon of 2-nitroglucal using an N-heterocycliccarbene catalyst. Control over the reaction conditions gives β-selective and nitro-eliminated C-glycosides, providing opportunities to produce new classes of C-glycoside.
Stereoselective synthesis of fluorinated aminoglycosyl phosphonates
作者:Sanne Bouwman、Romano V. A. Orru、Eelco Ruijter
DOI:10.1039/c4ob02317j
日期:——
We describe the conjugate addition of lithiated difluoromethanephosphonates to a diverse range of nitroglycals as a convenient method for the highly stereoselective synthesis of fluorinated aminoglycosyl phosphonates. Our approach provides opportunities to produce hydrolytically stable mimics of biologically important aminoglycosyl phosphates.