(3S,4R,5S,6S)-6-[(7E,11E,15E)-(1R,2S,13S,17S,19R)-11-Ethyl-2-hydroxy-1,7,13,17-tetramethyl-19-(2-methyl-[1,3]dioxolan-2-yl)-4-oxo-icosa-7,11,15-trienyl]-4-methoxy-3,5-dimethyl-tetrahydro-pyran-2-one 在
4-甲基苯磺酸吡啶 作用下,
以
水 、
丙酮 为溶剂,
反应 7.5h,
以95%的产率得到(6E,10E,14E)-(3R,5S,9S,20S,21R)-11-Ethyl-20-hydroxy-21-((2S,3S,4R,5S)-4-methoxy-3,5-dimethyl-6-oxo-tetrahydro-pyran-2-yl)-3,5,9,15-tetramethyl-docosa-6,10,14-triene-2,18-dione