5-[(benzyloxycarbonyl)amino]pentyl (3,4-di-O-benzyl-α-L-rhamnopyranosyl)-(1->2)-3,4-di-O-benzyl-α-L-rhamnopyranoside 、 phenyl (2-O-benzoyl-3,4-di-O-benzyl-α-L-rhamnopyranosyl)-(1->3)-[3,4,6-tri-O-benzyl-2-O-(2-methoxycarbonylbenzyl)-α-D-glucopyranosyl-(1->4)]-6-O-benzyl-2-deoxy-1-thio-2-trifluoroacetamido-β-D-glucopyranoside 在
N-碘代丁二酰亚胺 、
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 0.5h,
以55%的产率得到methyl 2-[[(2R,3R,4S,5R,6R)-2-[(2R,3S,4R,5R,6S)-4-[(2S,3R,4R,5S,6S)-3-benzoyloxy-6-methyl-4,5-bis(phenylmethoxy)oxan-2-yl]oxy-6-[(2S,3R,4R,5S,6S)-6-methyl-2-[(2R,3R,4R,5S,6S)-6-methyl-4,5-bis(phenylmethoxy)-2-[5-(phenylmethoxycarbonylamino)pentoxy]oxan-3-yl]oxy-4,5-bis(phenylmethoxy)oxan-3-yl]oxy-2-(phenylmethoxymethyl)-5-[(2,2,2-trifluoroacetyl)amino]oxan-3-yl]oxy-4,5-bis(phenylmethoxy)-6-(phenylmethoxymethyl)oxan-3-yl]oxymethyl]benzoate