Intramolecular 1,8-Hydrogen Atom Transfer. Stereoselectivity of the Hexopyranos-5′-yl Radical Reactions in Hex<i>p</i>-(1→4)-Hex<i>p</i> Disaccharide Systems
作者:Ángeles Martín、Inés Pérez-Martín、Luís M. Quintanal、Ernesto Suárez
DOI:10.1021/jo801499d
日期:2008.10.3
in alpha-D-Hex p-(1-->4)-D-Hex p disaccharide models is described. These radicals are generated from a 6-O-yl radical located in the other monosaccharic unit through a 1,8-hydrogenatomtransfer. The reaction, which is strongly influenced by steric and stereoelectronic effects, permits in some cases the transformation of alpha-D-Hex p-(1-->4)-D-Hex p into beta-L-Hex p-(1-->4)-D-Hex p disaccharides