double bond, controlled by substitution on the substrate. For the synthesis of 1-C-fucopyranosides (37, 38, and 42) a new method based on the use of fucosyl phenyl sulfoxides (35 and 41) was employed. An anomeric carbanion is generated through phenylsulfinyl-lithium exchange, which reacted with electrophiles with retention of configuration at the anomeric center. The required fucosyl sulfoxides were prepared
作者:Hartmut Redlich、Wolfgang Sudau、Anna Katrin Szardenings、Roland Vollerthun
DOI:10.1016/0008-6215(92)84055-w
日期:1992.3
7-Deoxy-7-iodohept-1-enitols react intramolecularly to give 5-carba analogues of pyranoses (pseudo sugars) by the action of tributyltin hydride, which generates a radical at C-7. The configuration at the new chiral centre depends on the relative orientation of the oxygen functions in the starting material and the pattern of substitution.
MASSY, D. JAMES R.;WYSS, PIERRE, HELV. CHIM. ACTA, 73,(1990) N, C. 1037-1057