Highly Stereoselective and Iterative Synthesis of α-(1→4)-Linked Polysaccharides Composed of 3-<i>O</i>-Methyl-<scp>d</scp>-mannose
作者:Hwan-Sung Cheon、Yiqian Lian、Yoshito Kishi
DOI:10.1021/ol0713335
日期:2007.8.1
second-generation synthesis of synthetic 3-O-methyl-D-mannose-containing polysaccharides (sMMPs) is reported. The glycosidation of donor B and acceptor C, prepared from a common precursor A in two and one steps, respectively, is effected by t-butyldimethylsilyl trifluoromethanesulfonate to furnish only the desired alpha-anomer D in high yields. Unlike the first-generation synthesis, this synthesis gives the
报道了合成的含3-O-甲基-D-甘露糖的多糖(sMMPs)的第二代合成。由共同的前体A分别分两步和一步制备的供体B和受体C的糖基化是通过叔丁基二甲基甲硅烷基三氟甲磺酸酯进行的,仅以高收率提供所需的α-端基异构体D。与第一代合成方法不同,该合成方法可提供所需的产品,而不会受到加扰产品的污染。使用三步协议对D进行脱保护以提供sMMP。