Synthesis of <scp>l</scp>-Vancosamine Derivatives from Methyl α-<scp>d</scp>-Mannopyranoside
作者:Keisuke Suzuki、Day-Shin Hsu、Takashi Matsumoto
DOI:10.1055/s-2006-926231
日期:——
Concise synthesis of l-vancosamine, the amino sugar constituent of vancomycin and other antibiotics, has been achieved. The key steps include (1) stereoselective addition of methylcerium reagent to oximino ether, and (2) stereoselective hydrogenation of 5,6-unsaturated glycoside with C(5) inversion to give l-vancosamine derivative. C-Glycosidation of vancosaminyl acetate with iodoresorcinol proceeded in the presence of Sc(OTf)3 in high yield.
我们实现了万古霉素和其他抗生素的氨基糖成分--l-万古胺的简易合成。关键步骤包括:(1) 将甲基铈试剂立体选择性地加成到氧亚氨基醚中,(2) 5,6-不饱和糖苷与 C(5) 反转进行立体选择性氢化,得到 l-万古酰胺衍生物。在 Sc(OTf)3 存在下,用碘间苯二酚对醋酸万古霉素进行糖苷化反应,产率很高。