3β-(3,6-di-O-benzoyl-β-D-glucopyranosyl)-6α,26-O-di-acetyl-(25R)-furost-5-en 、
2,3,4-tri-O-acetyl-L-rhamnopyranosyl trichloroacetimidate 在
三氟化硼乙醚 作用下,
以
二氯甲烷 为溶剂,
生成 [(2R,3R,4S,5R,6R)-6-[[(1R,2S,4S,6R,7S,8R,9S,12S,13R,16S,18S,19S)-19-acetyloxy-6-[(3R)-4-acetyloxy-3-methylbutyl]-7,9,13-trimethyl-5-oxapentacyclo[10.8.0.02,9.04,8.013,18]icosan-16-yl]oxy]-4-benzoyloxy-3,5-bis[[(2S,3R,4R,5S,6S)-3,4,5-triacetyloxy-6-methyloxan-2-yl]oxy]oxan-2-yl]methyl benzoate