(6R,6aS,14aR)-methyl 1,6,8,14a-tetrahydroxy-11-((2S,3R,4R,5R,6S)-4-hydroxy-3,5-dimethoxy-6-methyltetrahydro-2H-pyran-2-ylamino)-6a-methoxy-3-methyl-7,9,12,14-tetraoxo-5,6,6a,7,9,12,14,14a-octahydrobenzo[a]tetracene-2-carboxylate 、
potassium carbonate 、
1-(溴乙酰基)哌啶 在
silica gel 、
methanol-dichloromethane 作用下,
以to afford (6R,6aS,14aR)-methyl 6,8,14a-trihydroxy-11-((2S,3R,4R,5R,6S)-4-hydroxy-3,5-dimethoxy-6-methyltetrahydro-2H-pyran-2-ylamino)-6a-methoxy-3-methyl-7,9,12,14-tetraoxo-1-(2-oxo-2-(piperidin-1-yl)ethoxy)-5,6,6a,7,9,12,14,14a-octahydrobenzo[a]tetracene-2-carboxylate (31 mg, 75%) as a brown solid的产率得到(6R,6aS,14aR)-methyl 6,8,14a-trihydroxy-11-((2S,3R,4R,5R,6S)-4-hydroxy-3,5-dimethoxy-6-methyltetrahydro-2H-pyran-2-ylamino)-6a-methoxy-3-methyl-7,9,12,14-tetraoxo-1-(2-oxo-2-(piperidin-1-yl)ethoxy)-5,6,6a,7,9,12,14,14a-octahydrobenzo[a]tetracene-2-carboxylate