Intramolecular 1,8-Hydrogen-Atom Transfer Reactions in (1→4)-<i>O</i>-Disaccharide Systems: Conformational and Stereochemical Requirements
作者:Cosme G. Francisco、Antonio J. Herrera、Alan R. Kennedy、Angeles Martín、Daniel Melián、Inés Pérez-Martín、Luis M. Quintanal、Ernesto Suárez
DOI:10.1002/chem.200801414
日期:2008.11.17
stereochemical and conformational factors controlling the intramolecular hydrogen-atom transfer (HAT) reaction between the two pyranose units in a (1-->4)-O-disaccharide when promoted by a primary 6-O-yl radical are studied. Models with alpha-D-Glcp-(1-->4)-beta-D-Glcp, alpha-L-Rhamp-(1-->4)-alpha-D-Galp or alpha-D-Manp-(1-->4)-beta-L-Gulp skeletons led exclusively to the abstraction of the hydrogen from H--C-5'
Intramolecular 1,8- versus 1,6-Hydrogen Atom Transfer between Pyranose Units in a (1→4)-Disaccharide Model Promoted by Alkoxyl Radicals. Conformational and Stereochemical Requirements
作者:Angeles Martín、Inés Pérez-Martín、Luis M. Quintanal、Ernesto Suárez
DOI:10.1021/ol070496q
日期:2007.4.1
see text] The stereochemical and conformational factors controlling the intramolecular hydrogen atomtransfer (HAT) reaction between the two pyranose units in a (1-->4)-disaccharide when promoted by a primary 6-O-yl radical are studied. Models with alpha-d-Glcp-(1-->4)-beta-d-Glcp or alpha-l-Rhamp-(1-->4)-alpha-d-Galp skeletons lead exclusively to the abstraction of H-C-5' and the formation, through