methyl (phenyl 5-amino-5-N,4-O-carbonyl-3,5-dideoxy-9-O-(5-amino-5-N,4-O-carbonyl-3,5-dideoxy-D-glycero-α-D-galacto-non-2-ulopyranosylonate)-2-thio-D-glycero-α-D-galacto-2-nonulopyranoside)onate 、
methyl (3aR,4R,6R,7aS)-6-[(2R,3S)-3-[(3aR,4R,6S,7aS)-6-dibutoxyphosphoryloxy-6-methoxycarbonyl-2-oxo-3a,4,7,7a-tetrahydro-3H-pyrano[3,4-d][1,3]oxazol-4-yl]-2,3-diacetyloxypropoxy]-2-oxo-4-[(1S,2R)-1,2,3-tris[(2-chloroacetyl)oxy]propyl]-3a,4,7,7a-tetrahydro-3H-pyrano[3,4-d][1,3]oxazole-6-carboxylate 在
三氟甲磺酸三甲基硅酯 作用下,
以
二氯甲烷 、
乙腈 为溶剂,
反应 1.5h,
以68%的产率得到methyl (3aR,4R,6R,7aS)-4-[(1R,2R)-3-[[(3aR,4R,6R,7aS)-4-[(1S,2R)-3-[[(3aR,4R,6R,7aS)-6-methoxycarbonyl-2-oxo-4-[(1S,2R)-1,2,3-tris[(2-chloroacetyl)oxy]propyl]-3a,4,7,7a-tetrahydro-3H-pyrano[3,4-d][1,3]oxazol-6-yl]oxy]-1,2-diacetyloxypropyl]-6-methoxycarbonyl-2-oxo-3a,4,7,7a-tetrahydro-3H-pyrano[3,4-d][1,3]oxazol-6-yl]oxy]-1,2-dihydroxypropyl]-6-[(2R,3R)-3-[(3aR,4R,6S,7aS)-6-methoxycarbonyl-2-oxo-6-phenylsulfanyl-3a,4,7,7a-tetrahydro-3H-pyrano[3,4-d][1,3]oxazol-4-yl]-2,3-dihydroxypropoxy]-2-oxo-3a,4,7,7a-tetrahydro-3H-pyrano[3,4-d][1,3]oxazole-6-carboxylate