3,3'-di(benzaldehyde)-3,3'-dihydroxy-[2,2'-bi-1Hindene]-1,1'-dione   、                                                                                      
4-氨基-TEMPO                                                                                                                                                              在
                                                                                                                                                                                 
溶剂黄146                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 4.0h,
                                                                                                                以60%的产率得到(2E,3S)-3-hydroxy-2-[(1R)-1-hydroxy-3-oxo-1-[4-[(2,2,6,6-tetramethyl-1-oxopiperidin-1-ium-4-yl)iminomethyl]phenyl]inden-2-ylidene]-3-[4-[(2,2,6,6-tetramethyl-1-oxidopiperidin-4-yl)iminomethyl]phenyl]inden-1-one