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Preparation of 2-amino-2-C-glycosyl-acetonitriles from C-glycosyl aldehydes by Strecker reaction
Authors:Sipos Szabolcs  Jablonkai István  Egyed Orsolya  Czugler Mátyás
Institution:Institute of Biomolecular Chemistry, Chemical Research Center, Hungarian Academy of Sciences, PO Box 17, 1525 Budapest, Hungary
Abstract:Synthesis of new 2-amino-2-C-d-glycosyl-acetonitriles in a Strecker reaction from various C-glycosyl aldehydes, chiral amines, and HCN was carried out. While aminonitriles from glycal and 2-deoxy-β-d-glycosyl aldehydes were prepared in satisfactory yields, lower yields were obtained with C-glycosyl aldehydes. Strecker reaction with the benzyl-protected 1-C-formyl-d-galactal and S- or R-1-phenylethylamine (S-PEA or R-PEA) yielded predominantly the R-configured C-glycosyl aminoacetonitrile. The direction of the nucleophilic addition appears to be governed by the configuration of the anomeric carbon with β-linked sugars. Since the stereochemistry of the transition state is unknown according to the configuration of the major product a Felkin–Ahn selectivity can be mainly presumed.
Keywords:1-C-Glycosyl aldehyde  Strecker reaction  d-glycosyl-acetonitrile" target="_blank">2-Amino-2-C-d-glycosyl-acetonitrile  Double asymmetric induction
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