3-甲基-2-环己烯-1-酮   、                                                                                      
2-Methyl-buta-2,3-dienoic acid (1R,2S,5R)-2-isopropyl-5-methyl-cyclohexyl ester                                                                                                                                                              在
                                                                                                                                                                                 
lithium diisopropyl amide                                                                                                                                  作用下,
                                                                                                                                                                                                                            以75%的产率得到1,2-Dimethyl-3-methylene-5-oxo-bicyclo[2.2.2]octane-2-carboxylic acid (1R,2S,5R)-2-isopropyl-5-methyl-cyclohexyl ester