4-tolyl 3,4-O-isopropylidene-1-thio-β-D-galactopyranoside 、 methyl p-tolyl 5-acetamido 7,8,9-tri-O-acetyl-5-N,4-O-carbonyl-3,5-dideoxy-2-thio-D-glycero-β-D-galacto-2-nonulopyranosonate 在
4-甲基苯硫氯 、
silver trifluoromethanesulfonate 作用下,
以
二氯甲烷 、
乙腈 为溶剂,
反应 1.5h,
以89%的产率得到methyl (3aR,4R,6R,7aS)-6-[[(3aS,4R,6S,7R,7aR)-7-hydroxy-2,2-dimethyl-6-(4-methylphenyl)sulfanyl-4,6,7,7a-tetrahydro-3aH-[1,3]dioxolo[4,5-c]pyran-4-yl]methoxy]-3-acetyl-2-oxo-4-[(1S,2R)-1,2,3-triacetyloxypropyl]-3a,4,7,7a-tetrahydropyrano[3,4-d][1,3]oxazole-6-carboxylate