Direct Ferrier rearrangement on unactivated glycals catalyzed by indium(III) chloride
作者:Paramathevar Nagaraj、Namakkal G. Ramesh
DOI:10.1016/j.tetlet.2009.04.084
日期:2009.7
Anhydrous InCl3 has been shown to efficiently catalyze the Ferrier rearrangement by a direct allylic substitution of the hydroxyl group at C-3 position of glycals to afford the corresponding 2,3-unsaturated glycosides in high yields at ambient temperature. This methodology obviates the need for protecting and/or activating the C-3 hydroxyl group of glycals. The reaction works in equal ease with both
已经证明无水InCl 3通过在糖基的C -3位置上的羟基的直接烯丙基取代有效地催化费列重排,从而在环境温度下以高收率提供相应的2,3-不饱和糖苷。该方法避免了保护和/或活化糖基的C -3羟基的需要。将反应工作在同样容易与两个4,6-二ö苄基d -glucal和4,6-二- ö苄基d -galactal。InCl 3的温和性使该方法与具有酸不稳定基团的糖基受体兼容。反应的普遍性已通过多种醇,酚和糖亲核试剂得到证明。