benzyl N-[5-[(2R,3R,4R,5R,6R)-3-azido-4-hydroxy-6-(hydroxymethyl)-5-phenylmethoxyoxan-2-yl]oxypentyl]carbamate 、 methyl (5-acetamido-7,8,9-tri-O-acetyl-5-N,4-O-carbonyl-2-(dibutylphosphoryl)-3,5-dideoxy-D-glycero-α,β-D-galacto-non-2-ulopyranoside)onate 在
三氟甲磺酸三甲基硅酯 作用下,
以
二氯甲烷 为溶剂,
以70%的产率得到methyl (3aR,4R,6R,7aS)-3-acetyl-6-[[(2R,3R,4R,5R,6R)-5-azido-4-hydroxy-3-phenylmethoxy-6-[5-(phenylmethoxycarbonylamino)pentoxy]oxan-2-yl]methoxy]-2-oxo-4-[(1S,2R)-1,2,3-triacetyloxypropyl]-3a,4,7,7a-tetrahydropyrano[3,4-d][1,3]oxazole-6-carboxylate