(2S,4R,5R,6S)-5-acetyl-5-hydroxy-6-methyltetrahydro-2H-pyran-2,4-diyl diacetate 、
dideoxy-DC-45-A2 在
三氟甲磺酸三甲基硅酯 作用下,
以
乙醚 为溶剂,
反应 7.5h,
以10%的产率得到(2S,3R,4R,6S)-3-Acetyl-6-(((2S,2'R,3a'S,4'S,8'S,10'S,13a'S)-10'-((tert-butyldimethylsilyl)oxy)-2'-(dimethoxymethyl)-5',12'-dihydroxy-7'-methoxy-8'-((4-methoxybenzyl)oxy)-11'-oxo-3a',4',8',9',10',11'-hexahydro-2'H,13a'H-spiro[oxirane-2,1'-[2,4]epoxyfuro[3,2-b]naphtho[2,3-h]chromen]-13a'-yl)oxy)-3-hydroxy-2-methyltetrahydro-2H-pyran-4-yl acetate