(2S,3Z)-5-({(2R,3R,5S,6S)-6-[(2E,4E)-5-{(3R,4R,5R,7S)-4-(1-ethoxyethoxy)-7-[2-oxo-2-(propylamino)ethyl]-1,6-dioxaspiro[2.5]oct-5-yl}-3-methylpenta-2,4-dien-1-yl]-2,5-dimethyltetrahydro-2H-pyran-3-yl}amino)-5-oxopent-3-en-2-yl 2-methylpropanoate 在
4-甲基苯磺酸吡啶 作用下,
以
甲醇 为溶剂,
反应 1.0h,
以50%的产率得到(2S,3Z)-5-({(2R,3R,5S,6S)-6-[(2E,4E)-5-{(3R,4R,5R,7S)-4-hydroxy-7-[2-oxo-2-(propylamino)ethyl]-1,6-dioxaspiro[2.5]oct-5-yl}-3-methylpenta-2,4-dien-1-yl]-2,5-dimethyltetrahydro-2H-pyran-3-yl}amino)-5-oxopent-3-en-2-yl 2-methylpropanoate