乙缩醛 、 (5R,5aR,8aR,9S)-9-((2R,3R,4R,5S,6R)-3-Amino-4,5-dihydroxy-6-hydroxymethyl-tetrahydro-pyran-2-yloxy)-5-(4-hydroxy-3,5-dimethoxy-phenyl)-5,8,8a,9-tetrahydro-5aH-furo[3',4':6,7]naphtho[2,3-d][1,3]dioxol-6-one 、
丙烯酸乙酯 在
对甲苯磺酸 作用下,
生成
1-O-(2-deoxy-2-(ethoxycarbonyl)ethylamino-4:6-O-ethylidene-β-D-glucopyranosyl)-4'-O-demethyl-1-epipodophyllotoxin