5-(tert-butoxymethyl)-3,3-dimethylpyrrolidine-2,4-dione   、                                                                                      
4-溴-2-氯苯甲腈   、                                                                                      
Dicaesio carbonate   、                                                                                      
4,5-双二苯基膦-9,9-二甲基氧杂蒽                                                                                                                                                              在
                                                                                                                                         
(1E,4E)-1,5-diphenylpenta-1,4-dien-3-one;palladium                                                                                                                                                                          作用下,
                                                                                                                                                                                                                            以in the same manner as in Reference Example 3, the title compound was obtained as colorless crystals (yield: 1.59 g, 81%)的产率得到4-[5-(tert-butoxymethyl)-3,3-dimethyl-2,4-dioxopyrrolidin-1-yl]-2-chlorobenzonitrile