Preparation of Several 1,5,5,11-Pentamethyltricyclo[6.2.1.02,6]undecane Derivatives
1981
1,6-Diketone, available in eight steps from homocamphorquinone, was converted into 1,5,5,11,11-pentamethyltricyclo[6.2.1.02,6]undecan-7-one by treatment with potassium t-butoxide and then lithium dimethylcuprate, while α,α-dimethyl-γ-valerolactone, prepared in five steps from homocamphor, was converted into 1,5,5,11,11-pentamethyltricyclo[6.2.1.02,6]undec-2-en-4-one by treatment with diphosphorus pentoxide–methanesulfonic acid.
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