(1R,2R,2'S,4R,5'R,7S,8S,10R)-7-diacetoxymethyl-10-t-butyldimethylsiloxy-6-oxo-3,5-dioxatricyclo<6.3.0.0
2.7>undecane-4-spiro(2'-isopropyl-5'-methyl)cyclohexane 在
pyridinium chlorochromate 作用下,
以
二氯甲烷 为溶剂,
生成
methyl (1S,5S,6R)-5-methoxy-8-oxo-4-oxabicyclo<4.3.0>non-2-ene-2-carboxylate