Stereoselective Synthesis of α(2,9) Di- to Tetrasialic Acids, Using a 5,4-<i>N</i>,<i>O</i>-Carbonyl Protected Thiosialoside
作者:Hiroshi Tanaka、Yuji Nishiura、Takashi Takahashi
DOI:10.1021/jo900176e
日期:2009.6.5
stereoselective synthesis of α(2,9) tetra- to disialic acids 1−3, using the 5,4-N,O-carbonyl protected thiosialoside 4, is described. The cyclic protecting group was effective for α-sialylation without the need for acetonitrile as the solvent. The donor 4 enabled the formation of a tetramer in excellent yield and selectivity. Deprotection of the cyclic protecting groups of the protected di- to tetrasialica