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
High-pressure (2+2)cycloaddition of toluene-4-sulphonyl isocyanate to glycals is examined. Reactions proceed regiospecifically to afford single products in case of all 3-substituted glycals. Upon heating or even after standing at room temperature adducts undergo retro-addition to give starting glycals. Various aspects of the cycloaddition are discussed, especially ret-ro-reaction and rearrangement
Selective deoxygenation of unsaturated carbohydrates with Pd(0)/Ph2SiH2/ZnCl2. Total synthesis of (+)-(S,S)-(6-methyltetrahydropyran-2-yl)acetic acid
作者:Noam Greenspoon、Ehud Keinan
DOI:10.1021/jo00251a011
日期:1988.8
C-Glycosides from palladium-mediated reactions of pyranoid glycals. Stereochemistry of formation of intermediate organopalladium adducts and factors affecting their stability and decomposition
作者:Jane Chi Ya Cheng、G. Doyle Daves
DOI:10.1021/jo00390a022
日期:1987.7
Synthesis of phenyl 2-azido-2-deoxy-1-selenoglycosides from glycals
作者:F. Santoyo-Gonzalez、F. G. Calvo-Flores、P. Garcia-Mendoza、F. Hernandez-Mateo、J. Isac-Garcia、R. Robles-Diaz