(4aR,6S,7R,8S,8aR)-6-(((1S,4aS,7R,7aS)-4'-((S)-1-acetoxyethyl)-4-(methoxycarbonyl)-5'-oxo-4a,7a-dihydro-1H,5'H-spiro[cyclopenta[c]pyran-7,2'-furan]-1-yl)oxy)-2-phenylhexahydropyrano[3,2-d][1,3]dioxine-7,8-diyl diacetate 在
三乙基硅烷 、 molecular sieve 、
三氟化硼乙醚 、
sodium methylate 作用下,
以
甲醇 、
二氯甲烷 为溶剂,
反应 11.5h,
生成 methyl (1S,4aS,7R,7aS)-1-[(2S,3R,4R,5S,6R)-5-[(2S,3R,4R,5S,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-(phenylmethoxymethyl)oxan-2-yl]oxy-4'-[(1S)-1-hydroxyethyl]-5'-oxospiro[4a,7a-dihydro-1H-cyclopenta[c]pyran-7,2'-furan]-4-carboxylate