Indium-Mediated Stereoselective Synthesis of Truncated, 6- and 7-Carbon Sialic Acids
作者:Wolf-Dieter Fessner、Mathias Warwel
DOI:10.1055/s-2002-35564
日期:——
Several 6- and 7-carbon sialic acid derivatives were synthesized, without tedious protecting group manipulations, in high overall yields. A key step of the synthesis was the chain extension of suitable α-amino aldehyde derivatives by an indium-mediated addition of ethyl 2-(bromomethyl)acrylate. Under acidic reaction conditions, the corresponding extended enoates were obtained with high trans-stereoselectivity. Ozonolysis furnished the desired 4-acylamino-substituted hexulosonic and heptulosonic acids in free form for biochemical studies.