作者:Claude Grison、Frédéric Coutrot、Philippe Coutrot
DOI:10.1016/s0040-4020(01)00600-7
日期:2001.7
The synthesis of new N- or C-protected glycosyl-alpha -aminoacids and their use to prepare new glycopeptides is described. The overall synthetic strategy to obtain these new alpha -aminoacid chirons involves four distinct steps from dialdoses: (1) a diastereoselective Darzens reaction between the potassium anion derived from isopropyl dichloroacetate and a suitable protected dialdose, (2) the one-pot transformation of the so-obtained isopropyl glycosyl-alpha -chloroglycidic ester with magnesium iodide, then sodium hydrogenosulfite, into an isopropyl glycosyl-alpha -ketoester, (3) the reductive amination of the alpha -ketoester with (S)-alpha -methylbenzylamine and an hydrogenating reagent, (4) N- or C-selective deprotection and further peptidic coupling. (C) 2001 Elsevier Science Ltd. All rights reserved.