C-Branched pyrrolidines from 2-C-acetylmethyl-glycosylazides. Reduction of imines formed by monosaccharide ring opening
作者:Huawu Shao、Dean T. Williams、Shih-Hsiung Wu、Wei Zou
DOI:10.1016/j.carres.2006.07.005
日期:2006.10
conformationally strained 1,2-trans-fused bicyclic imine, we propose that the beta-glycosylamine underwent anomerization to an acyclic imine (4) followed by an intramolecular ring closure by the 5-hydroxy group. The resultant 2-C-acetylmethyl-alpha-glucopyranosylamine 5, which possesses the 1,2-cis-configuration was immediately converted to a bicyclic imine (2) in excellent yield. Attempts to selectively