6-[(2R,3R,4R,5S,6R)-3-Acetylamino-6-benzyloxymethyl-5-hydroxy-4-((2S,3S,4R,5R,6S)-3,4,5-tris-benzyloxy-6-methyl-tetrahydro-pyran-2-yloxy)-tetrahydro-pyran-2-yloxy]-hexanoic acid methyl ester 、 [(2R,3S,4S,5R)-4,5-diacetyloxy-6-bis(phenylmethoxy)phosphanyloxy-2-(phenylmethoxymethyl)oxan-3-yl] acetate 在
三氟甲磺酸三甲基硅酯 、 4 A molecular sieve 作用下,
以
二氯甲烷 为溶剂,
反应 20.0h,
以29%的产率得到methyl 6-[(2R,3R,4R,5S,6R)-3-acetamido-4-[(2S,3S,4R,5R,6S)-6-methyl-3,4,5-tris(phenylmethoxy)oxan-2-yl]oxy-6-(phenylmethoxymethyl)-5-[(2S,3R,4S,5S,6R)-3,4,5-triacetyloxy-6-(phenylmethoxymethyl)oxan-2-yl]oxyoxan-2-yl]oxyhexanoate