Stereo- and regio-selectivity of diethylaminosulfur trifluoride as a fluorinating reagent for methyl glycosides
作者:Chandrasiri W. Somawardhana、Eric G. Brunngraber
DOI:10.1016/0008-6215(83)84005-1
日期:1983.9
Methyl glycopyranosides reacted with diethylaminosulfurtrifluoride (DAST) in the absence of solvent to yield methyl dideoxy-difluoro and deoxy-fluoro glycopyranosides. Methyl alpha-D-glycopyranosides produced 6-deoxy-6-fluoro- and 4,6-dideoxy-4,6-difluoro derivatives with Walden inversion at C-4. Methyl beta-D-glucopyranoside also produced a 3,6-dideoxy-3,6-difluoro derivative, with Walden inversion