Regio- and chemoselective manipulation under mild conditions on glucosamine derivatives for oligosaccharide synthesis and its application toward N-acetyl-d-lactosamine and Lewis X trisaccharide
作者:Yasuhito Nagai、Naoyuki Ito、Israt Sultana、Takeshi Sugai
DOI:10.1016/j.tet.2008.07.048
日期:2008.9
on regio- and chemoselective manipulation on a new glucosamine scaffold was laid, toward the short-step and efficient synthetic routes for oligosaccharides. First, the blocking of two hydroxyl groups at C-1 and C-6 positions of N-protected glucosamine at once by silylation followed by an oxazolidinone formation between C-3 hydroxyl and C-2 amino groups were established, to lead an expeditious way for
特别强调了对一种新的氨基葡萄糖支架的区域选择性和化学选择性的操纵,这是针对寡糖的短而有效的合成途径。首先,建立了甲硅烷基化作用立即阻断N-保护的氨基葡萄糖的C-1和C-6位置的两个羟基,然后在C-3羟基和C-2氨基之间形成恶唑烷酮的方法,这是一种快速的方法用于乳糖胺合成的糖基受体。其次,在相同条件下,对恶唑烷酮的开环反应和所得碳酸酯的水解在温和条件下不影响同一分子中的乙酰基保护基,使得C-3羟基游离,这对于进一步延伸至低聚糖是必不可少的,例如LeX三糖。