methyl 2,3,4,6-tetra-O-benzoyl-1-thio-β-D-galactopyranoside 在
N-碘代丁二酰亚胺 、
三氟甲磺酸 作用下,
以
二氯甲烷 为溶剂,
以70%的产率得到(2R,3R,4R,5S)-5-Acetoxy-2-benzyloxymethyl-3-((2R,3R,4S,5S,6R)-3,4,5-tris-benzoyloxy-6-benzoyloxymethyl-tetrahydro-pyran-2-yloxy)-4-((2S,3S,4R,5R,6S)-3,4,5-tris-benzyloxy-6-methyl-tetrahydro-pyran-2-yloxy)-piperidine-1-carboxylic acid benzyl ester