Convenient Synthesis of Branched-Chain Glycosamines by Radical Addition of Nitromethane to Glycals
作者:Elangovan Elamparuthi、Torsten Linker
DOI:10.1021/ol703062s
日期:2008.4.1
Radical addition-reduction-acetylation is the simple three-step sequence for the synthesis of branched-chain glycosamines 3 from glycals 1 and nitromethane (2). The intermediary formed 2-C-nitromethyl-pyranosides are valuable precursors for the synthesis of C-2 branched disaccharides.
Cerium(IV)-mediated C–C bond formations in carbohydrate chemistry
We provide a comprehensive study on the addition of radicals to unsaturated carbohydrates in the presence of cerium(IV) ammonium nitrate (CAN). The method is applicable to hexoses, pentoses, and disaccharides, tolerates different protecting groups, and is characterized by mild reaction conditions. Best substrates are malonates and glycals, which afford 2-C-branched carbohydrates in high yields and