Oxouracil   、                                                                                      1-[6-(4-Cyano-phenoxy)-pyridin-3-yl]-pyrrolidine-2,2-dicarboxylic acid diethyl ester   、                                                                                      
尿素                                                                                                                                                                                              以
                                                                                         
sodium ethanolate   、                                                                                         
乙醇                                                                                  为溶剂,
                                                                                                                                                                                        以afforded 14.3 mg of 4-[5-(2,6,8,10-Tetraoxo-1,7,9-triaza-spiro[4.5]dec-1-yl)-pyridin-2-yloxy]-benzonitrile as a colorless solid的产率得到4-[5-(2,6,8,10-Tetraoxo-1,7,9-triaza-spiro[4.5]dec-1-yl)-pyridin-2-yloxy]-benzonitrile