Fragmentation of carbohydrate anomeric alkoxy radicals: a new synthesis of chiral 1-halo-1-bromo compounds
作者:Concepción C González、Elisa I León、Concepción Riesco-Fagundo、Ernesto Suárez
DOI:10.1016/s0040-4039(03)01399-6
日期:2003.8
carbohydrates with (diacetoxyiodo)benzene (DIB) in the presence of bromine is a mild procedure for the synthesis of 1-deoxy-1-halo-1-bromo-alditols with one carbon less than the original carbohydrate. The reaction goes through β-fragmentation of the intermediate anomeric alkoxyl radicals. These 1-halo-1-bromo polyhydroxy compounds may be valuable synthetic intermediates in organicsynthesis.
Chromium(II) chloride-promoted reductive β-elimination of 1,1-dihalo alditols. Synthesis of highly functionalized alk-1-enyl halides
作者:Elisa I. León、Nieves R. Paz、Concepción Riesco-Fagundo、Ernesto Suárez
DOI:10.1016/j.tet.2008.08.100
日期:2008.11
A new general synthetic route to obtain highly functionalized (Z)- and (E)-alk-1-enyl halides is described, where the halogen can be indistinctly F, Cl, Br, and I. The procedure involves CrCl2-promoted reductive elimination of β-O-substituted gem-dihalo alditols easily accessible from carbohydrates. The simplicity and mildness of the reaction conditions and their compatibility with different functional