methanesulfonic acid 2-(4-(trifluoromethyl)phenyl)ethyl ester   、                                                                                      
[3-(3-cyclobutylmethyl-2,4-dioxo-1,3,8-triazaspiro[4.5]dec-8-yl)phenyl]acetic acid tert-butyl ester                                                                                                                                                              在
                                                                                                                                                                                 potassium fluoride on basic alumina                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙二醇二甲醚                                                                                  为溶剂,
                                                                                                                                                    反应 8.0h,
                                                                                                                生成                                                 (3-{3-cyclobutylmethyl-2,4-dioxo-1-[2-(4-trifluoromethylphenyl)ethyl]-1,3,8-triazaspiro[4.5]dec-8-yl}phenyl)acetic acid tert-butyl ester