(5R)-1-ethynyl-5-methyl-2-propan-2-ylidene-1-prop-2-enoxycyclohexane 在
[ruthenium(II)(η
6-1-methyl-4-isopropyl-benzene)(chloride)(μ-chloride)]
2 caesium carbonate 、
1,3-bis(2,4,6-trimethylphenyl)-4,5-dihydroimidazolium chloride 作用下,
以
甲苯 为溶剂,
反应 2.0h,
以54%的产率得到(9R)-4-ethenyl-9-methyl-6-propan-2-ylidene-1-oxaspiro[4.5]dec-3-ene