One less carbon atom is found in 1-halo-1-iodo compounds obtained by C1-C2 radical fragmentation of carbohydrate 1,2-halohydrins. This fragmentation is achieved via the anomeric alkoxy radicals of the halohydrins, formed upon reaction with (diacetoxyiodo)benzene and iodine [Eq. (1); X=Cl, Br, I].
在通过碳水化合物1,2-卤代醇的C1-C2自由基裂解获得的1-卤代-1-碘代化合物中,发现少一个碳原子。通过与(二乙酰氧基碘)苯和碘反应时形成的卤代醇的异头烷氧基自由基来实现这种断裂。(1); X = Cl,Br,I]。
Fragmentation of Carbohydrate Anomeric Alkoxy Radicals: A New Synthesis of Chiral 1-Halo-1-iodo Alditols
作者:Concepción C. González、Alan R. Kennedy、Elisa I. León、Concepción Riesco-Fagundo、Ernesto Suárez
DOI:10.1002/chem.200305294
日期:2003.12.5
reaction was achieved by radicalfragmentation of the C1bond;C2 bond, triggered by the initially formed anomeric alkoxy radical, and subsequent trapping of the C2-radical by iodine atoms. This methodology is compatible with the stability of the protective groups most frequently used in carbohydrate chemistry. The potential utility of these 1-halo-1-iodo alditols as chiral synthons was evaluated by