methyl (phenyl 5-acetamido-4-O-benzoyl-3,5-dideoxy-8,9-O-isopropylidene-2-thio-D-glycero-alpha-D-galacto-2-nonulopyranosid)onate 在
三氧化硫吡啶 、
N,N-二异丙基乙胺 作用下,
以
二甲基亚砜 为溶剂,
反应 1.5h,
以95%的产率得到methyl (phenyl 5-acetamido-4-O-benzoyl-3,5-dideoxy-8,9-O-isopropylidene-7-oxo-2-thio-D-glycero-alpha-D-galacto-2-nonulopyranosid)onate