p-tolyl-4,6-di-O-benzoyl-2-deoxy-1-thio-2-(2,2,2-trichloroethyloxycarbonylamino)-β-D-galactopyranoside 、 p-Tolyl 2-O-levulinyl-3,4,6-tri-O-benzyl-1-thio-beta-D-galactopyranoside 、
[(2R,3R,4S,5R,6S)-5-[(2-chlorophenyl)methoxy]-4-hydroxy-6-(4-methylphenyl)sulfanyl-3-(4-nitrobenzoyl)oxyoxan-2-yl]methyl 4-nitrobenzoate 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67%的产率得到[(2R,3S,4S,5R,6S)-4-[(2S,3R,4R,5R,6R)-5-benzoyloxy-6-(benzoyloxymethyl)-4-[(2R,3R,4S,5S,6R)-3-(4-oxopentanoyloxy)-4,5-bis(phenylmethoxy)-6-(phenylmethoxymethyl)oxan-2-yl]oxy-3-(2,2,2-trichloroethoxycarbonylamino)oxan-2-yl]oxy-5-[(2-chlorophenyl)methoxy]-6-(4-methylphenyl)sulfanyl-3-(4-nitrobenzoyl)oxyoxan-2-yl]methyl 4-nitrobenzoate