A stereocontrolled radical access to C-allyl β-D-glycopyranosides from glycopyranosylidene dihalides found en route to C-glycodienes
摘要:
Application of the Keck reaction to peracetylated glycopyranosylidene dihalides under mild conditions led efficiently to chloro C-allyl glycosides which were converted to either the corresponding C-allyl beta-D-glycosides or C-D-glycodienes on treatment with, respectively, tri-n-butyltin hydride and DBU. (C) 1997 Elsevier Science Ltd.
Expeditious synthesis of C-glycosyl conjugated dienes and aldehydes from sugar lactones
作者:Wen-Bin Yang、Chuan-Fa Chang、Shwu-Huey Wang、Chin-Fen Teo、Chun-Hung Lin
DOI:10.1016/s0040-4039(01)00814-0
日期:2001.7
Several C-glycosyl conjugateddienes were prepared in two steps from protected sugar lactones via addition of allylmagnesium chloride and the subsequent dehydration. A sequence of allylic addition, ozonolysis and dehydration led to the corresponding glycosyl conjugated aldehydes. These conjugated functionalities can be used as diagnostic chromophores for sugar synthesis and purification. The synthetic
Application of the Keck reaction to peracetylated glycopyranosylidene dihalides under mild conditions led efficiently to chloro C-allyl glycosides which were converted to either the corresponding C-allyl beta-D-glycosides or C-D-glycodienes on treatment with, respectively, tri-n-butyltin hydride and DBU. (C) 1997 Elsevier Science Ltd.