在
三氟甲磺酸三甲基硅酯 、
sodium methylate 作用下,
以
甲醇 、
二氯甲烷 为溶剂,
生成 (2S,3R,4R,5R,6S)-2-[(2R,3R,4S,5R,6R)-2-(hydroxymethyl)-4-methoxy-6-[(1S,2S,4S,5'R,6R,7S,8R,9S,12S,13R,16S)-5',7,9,13-tetramethylspiro[5-oxapentacyclo[10.8.0.02,9.04,8.013,18]icos-18-ene-6,2'-oxane]-16-yl]oxy-5-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-3-yl]oxy-6-methyloxane-3,4,5-triol