Fragmentation of carbohydrate anomeric alkoxy radicals: A new synthesis of chiral 1-halo-1-iodo compounds

Gonzalez, C.C. and Kennedy, A.R. and Leon, E.I. and Riesco-Fagundo, C. and Suarez, E. (2001) Fragmentation of carbohydrate anomeric alkoxy radicals: A new synthesis of chiral 1-halo-1-iodo compounds. Angewandte Chemie, 40 (12). pp. 2326-2331. ISSN 0044-8249 (http://dx.doi.org/10.1002/1521-3773)

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Abstract

The reaction of 1,2-halohydrins derived from easily available 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 organic synthesis.