(2S,2'S)-2,2'-(biphenyl-4,4'-diyl)bis(2-oxoethane-2,1-diyl) bis(2-(tert-butoxycarbonylamino)-3,3-dimethylbutanoate)                                                                                                                                                              在
                                                                                                                                                                                 ammonium acetate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
5,5-dimethyl-1,3-cyclohexadiene                                                                                  为溶剂,
                                                                                                                                                    反应 3.0h,
                                                                                                                以0.86 g的产率得到tert-butyl (1S,1'S)-1,1'-(4,4'-(biphenyl-4,4'-diyl)bis(1H-imidazole-4,2-diyl))bis(2,2-dimethylpropane-1,1-diyl)dicarbamate