[(3aR,5S,6S,7R,7aR)-7-acetyloxy-2-ethylsulfanyl-2,5-dimethyl-5,6,7,7a-tetrahydro-3aH-[1,3]dioxolo[4,5-b]pyran-6-yl] acetate 、
1,2:3,4-di-O-isopropylidene-6-O-trityl-α-D-galactopyranose 在
triphenylmethyl perchlorate 2,4,6-三甲基吡啶 作用下,
以
二氯甲烷 为溶剂,
以87%的产率得到1,2:3,4-di-O-isopropylidene-6-O-(2,3,4-tri-O-acetyl-β-L-rhamnopyranosyl)-α-D-galactopyranose