1-((3R,4R)-3,4-dihydroxy-2,2,5-trimethylchroman-6-yl)ethan-1-one 、
(1S)-(-)-莰烷酰氯 在
4-二甲氨基吡啶 作用下,
以
二氯甲烷 为溶剂,
以39%的产率得到[(3R,4R)-6-acetyl-2,2,5-trimethyl-3-[(1S,4R)-4,7,7-trimethyl-3-oxo-2-oxabicyclo[2.2.1]heptane-1-carbonyl]oxy-3,4-dihydrochromen-4-yl] (1S,4R)-4,7,7-trimethyl-3-oxo-2-oxabicyclo[2.2.1]heptane-1-carboxylate