C-(N-4-methoxyphenylcarbamoyl)-N-(p-tolyl)nitrone   、                                                                                      
dimethyl 2-(1-phenylethylidene)cyclopropane-1,1-dicarboxylate                                                                                                                                                                                              以
                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                    反应 41.0h,
                                                                                                                以51%的产率得到dimethyl (3SR,4RS,7RS)-4-methyl-6-(p-tolyl)-4-phenyl-7-[N-(4-methoxyphenyl)carbamoyl]-5-oxa-6-azaspiro[2.4]-heptane-1,1-dicarboxylate