6-[(2R,3R,4R,5S,6R)-4-Acetoxy-5-[(2S,3R,4S,5R,6R)-5-benzyloxy-6-benzyloxymethyl-4-hydroxy-3-(4-oxo-pentanoyloxy)-tetrahydro-pyran-2-yloxy]-6-benzyloxymethyl-3-(2,2,2-trichloro-ethoxycarbonylamino)-tetrahydro-pyran-2-yloxy]-hexanoic acid methyl ester 、
[(2S,3R,4S,5S,6R)-2-[(2R,3S,4R,5R,6S)-4-acetyloxy-6-(4-methylphenyl)sulfanyl-2-(phenylmethoxymethyl)-5-(2,2,2-trichloroethoxycarbonylamino)oxan-3-yl]oxy-4-[(4-methoxyphenyl)methoxy]-5-phenylmethoxy-6-(phenylmethoxymethyl)oxan-3-yl] 4-oxopentanoate 在
N-碘代丁二酰亚胺 、
三氟甲磺酸 、 3 A molecular sieve 作用下,
以
乙醚 、
二氯甲烷 为溶剂,
反应 3.0h,
以88%的产率得到methyl 6-[(2R,3R,4R,5S,6R)-4-acetyloxy-5-[(2S,3R,4S,5S,6R)-4-[(2S,3R,4R,5S,6R)-4-acetyloxy-5-[(2S,3R,4S,5S,6R)-4-[(4-methoxyphenyl)methoxy]-3-(4-oxopentanoyloxy)-5-phenylmethoxy-6-(phenylmethoxymethyl)oxan-2-yl]oxy-6-(phenylmethoxymethyl)-3-(2,2,2-trichloroethoxycarbonylamino)oxan-2-yl]oxy-3-(4-oxopentanoyloxy)-5-phenylmethoxy-6-(phenylmethoxymethyl)oxan-2-yl]oxy-6-(phenylmethoxymethyl)-3-(2,2,2-trichloroethoxycarbonylamino)oxan-2-yl]oxyhexanoate