Methyl 1-O-acetyl-6-S-acetyl-3,4-anhydro-6-thio-β-D-tagatofuranoside (the 1-acetate of (2)) and methyl 1-O-acetyl-3,4-anhydro-6-chloro-6-deoxy-β-D-tagatofuranoside (the 1-acetate of (3)) have been prepared as fructose derivatives by treatment of methyl 3,4-anhydro-β-D-tagatofuranoside (1) with (p-dimethylaminophenyl ) diphenylphosphine/diisopropyl azodicarboxylate/thioacetic S-acid and (p- dimethylaminophenyl ) diphenylphosphine/tetrachloromethane respectively. The reactions proceed in good yield, under mild conditions, and are selective for the 6-hydroxy group. The oxiran ring is unaffected under these conditions.
甲基 1-O-乙酰基-6-S-乙酰基-3,4-脱氢-6-硫代-β-D-塔加呋喃糖苷((2)的 1-乙酸酯)和甲基 1-O-乙酰基-3,4-脱氢-6-氯-6-脱氧-β-D-塔加呋喃糖苷((3)的 1-乙酸酯)通过处理甲基 3、4-anhydro-β-D-tagatofuranoside (1) 分别与(p-二甲基氨基苯基 ) 二苯基膦/偶氮二甲酸二异丙酯/硫代乙酸和(p-二甲基氨基苯基 ) 二苯基膦/四氯甲烷进行处理,制备出果糖衍生物。反应在温和的条件下进行,产率高,对 6-羟基具有选择性。在这些条件下,环氧乙烷环不受影响。