InCl<sub>3</sub>-Catalyzed Rapid 1,3-Alkoxy Migration in Glycal Ethers: Stereoselective Synthesis of Unsaturated α-<i>O</i>-Glycosides and an α,α-(1→1)-Linked Disaccharide
作者:Paramathevar Nagaraj、Namakkal G. Ramesh
DOI:10.1002/ejoc.200800453
日期:2008.9
facile stereoselective 1,3-migration of allylic ethers of glycals to afford 2-C-methylene- and 2,3-unsaturated-α-O-glycosides in high yields. The reaction is rapid (10 min), requires only 20 mol-% of the catalyst, and is compatible with acid-labile functional groups such as epoxides and acetals. This methodology provides a convenient alternative to the Ferrier rearrangement. A direct synthesis of an
InCl3 催化乙二醇烯丙醚的简单立体选择性 1,3-迁移,以高产率提供 2-C-亚甲基-和 2,3-不饱和-α-O-糖苷。反应迅速(10 分钟),仅需要 20 mol% 的催化剂,并且与酸不稳定的官能团(如环氧化物和缩醛)相容。这种方法为 Ferrier 重排提供了一种方便的替代方法。还报道了通过多米诺法直接合成 α,α-(11)-连接的二糖衍生物。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)