4-β-[(tetrahydropyran-2-yl)methoxycarbonyl]amino-4'-tert-butyldimethylsilyloxy-4'-O-demethyl-4-desoxypodophyllotoxin 在
Dowex 50 20-200 ion-exchange resin 作用下,
以
甲醇 为溶剂,
反应 16.0h,
以55%的产率得到[(5S,5aS,8aR,9R)-9-(4-Hydroxy-3,5-dimethoxy-phenyl)-8-oxo-5,5a,6,8,8a,9-hexahydro-furo[3',4':6,7]naphtho[2,3-d][1,3]dioxol-5-yl]-carbamic acid tetrahydro-pyran-2-ylmethyl ester