9-[(2R,3R,4R,5S,6S)-3-((2R,4aR,6S,7R,8R,8aS)-7-Acetylamino-8-hydroxy-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxin-6-yloxy)-4,5-bis-benzyloxy-6-methyl-tetrahydro-pyran-2-yloxy]-nonanoic acid methyl ester 、
3-O-<2'-O-(2''-O-acetyl-3'',4''-di-O-benzyl-α-L-rhamnopyranosyl)-3',4'-di-O-benzyl-α-L-rhamnopyranosyl>-2-O-benzoyl-4-O-benzyl-α-L-rhamnopyranosyl chloride 在
silver trifluoromethanesulfonate 、
1,1,3,3-四甲基脲 作用下,
以
二氯甲烷 为溶剂,
反应 40.0h,
以72.5%的产率得到8-methoxycarbonyloctyl-2-O-<2-acetamido-2-deoxy-4,6-O-benzylidene-3-O-<3-O-<2-O-(2-O-acetyl-3,4-di-O-benzyl-α-L-rhamnopyranosyl)-3,4-di-O-benzyl-α-L-rhamnopyranosyl>-2-O-benzoyl-4-O-benzyl-α-rhamnopyranosyl>-β-D-glucopyranosyl>-3,4-di-O-benzyl-α...