Rhizobial saccharides 2. Selective synthesis of both diastereomers of 4,6-O-pyruvylated d-glycopyranosides
作者:Thomas Ziegler
DOI:10.1016/0040-4039(94)85023-2
日期:1994.9
Both diastereomers of 4,6-O-pyruvylated glycosides S- and R - 2 were selectively prepared from the corresponding 4,6-unprotected glycosides 1 by acetalation of the latter with methyl pyruvate and BF3-diethylether complex. In acetonitrile as the solvent, the thermodynamically favoured diastereomers having an axial-oriented methoxycarbonyl group are formed preferentially. In methyl pyruvate as the solvent