4-β-(allyloxycarbonyl)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62%的产率得到prop-2-enyl N-[(5S,5aS,8aR,9R)-9-(4-hydroxy-3,5-dimethoxyphenyl)-8-oxo-5a,6,8a,9-tetrahydro-5H-[2]benzofuro[5,6-f][1,3]benzodioxol-5-yl]carbamate