(+)-(2R,3R,4S)-2,4-dimethyl-5-oxo-3-((1R)-1-phenylethoxy)heptanoic acid 、
(-)-(1Z,2S,3S,4R,5S)-5-[(allyloxycarbonyl)oxy]-1-ethylidene-3-hydroxy-2,4,6-trimethylheptyl acetate 在
4-二甲氨基吡啶 、
2,4,6-三氯苯甲酰氯 、
三乙胺 作用下,
以
甲苯 为溶剂,
反应 0.67h,
以71%的产率得到(+)-(1Z,2S,3S,4R,5S)-5-(allyloxycarbonyloxy)-1-ethylidene-3-{(2R,3R,4S)-2,4-dimethyl-5-oxo-3-[(1R)-1-phenylethoxy]heptanoyloxy}-2,4,6-trimethylheptyl acetate