Synthesis of P-glycosylphosphonothioates by radical rearrangement

CARB 80

Kehinde Ajayi, kajayi@rutchem.rutgers.edu and Spencer Knapp, knapp@rutchem.rutgers.edu. Department of Chemistry and Chemical Biology, Rutgers University, 610 Taylor Rd., Piscataway, NJ 08854
Alpha-GlcNAc mercaptan 1 reacts with certain phosphorus(III) and (V) reagents to afford glycomimetic S-glycosylphosphothioates such as 2. Under oxidative conditions, however, an intermediate S-glycosylphosphothioite 3 can give, instead of 2, a rearranged P-glycosylphosphonothioate (4). Preparative, mechanistic, and stereochemical aspects of this radical rearrangement will be presented.