4-溴-2-甲氧基苯腈   、                                                                                      
(4R,5S)-5-ethyl-3,3-difluoro-4-hydroxypyrrolidin-2-one   、                                                                                      
4,5-双二苯基膦-9,9-二甲基氧杂蒽   、                                                                                      
Dicaesio carbonate                                                                                                                                                              在
                                                                                                                                         
(1E,4E)-1,5-diphenylpenta-1,4-dien-3-one;palladium                                                                                                                                                                          作用下,
                                                                                                                                                                                                                            以in the same manner as in Example 62, the title compound was obtained as a white powder (yield: 895 mg, 30%)的产率得到4-[(4R,5S)-5-ethyl-3,3-difluoro-4-hydroxy-2-oxopyrrolidin-1-yl]-2-methoxybenzonitrile