(3R,4R,5R,7S)-5-{(1E,3E)-5-[(2S,3S,5R,6R)-5-{[(2Z,4S)-4-hydroxypent-2-enoyl]amino}-3,6-dimethyltetrahydro-2H-pyran-2-yl]-3-methylpenta-1,3-dien-1-yl}-7-[2-oxo-2-(propylamino)ethyl]-1,6-dioxaspiro[2.5]oct-4-yl acetate 在
potassium carbonate 、
N,N-二异丙基乙胺 作用下,
以
甲醇 、
二氯甲烷 为溶剂,
反应 17.25h,
生成
(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 piperidine-1-carboxylate