N,N-二乙基氯甲酰胺   、                                                                                      tert-butyl (3aS,6aR)-5-oxospiro[3,3a,4,6a-tetrahydro-2H-pyrrolo[3,2-b]pyrrole-6,1'-cyclobutane]-1-carboxylate                                                                                                                                                              在
                                                                                                                                                                                 
lithium hexamethyldisilazane                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                                                        以51%的产率得到tert-butyl (3a'R,6a'S)-1'-(diethylcarbamoyl)-2'-oxohexahydro-4'H-spiro[cyclobutane-1,3'-pyrrolo[3,2-b]pyrrole]-4'-carboxylate