(2R,4R)-2-[(4S,5S)-3-acetyl-4-(3,5-difluorobenzyl)-2,2-dimethyloxazolidin-5-yl]-4-hydroxy-4-trifluoromethyl-pyrrolidine-1-carboxylic acid tert-butyl ester   、                                                                                      
1-溴-3-甲基-2-丁烯                                                                                                                                                              在
                                                                                                                                                                                 sodium hydride                                                                                                                                  作用下,
                                                                                                                以
                                                                                         DMF (N,N-dimethyl-formamide)                                                                                  为溶剂,
                                                                                                                                                    反应 0.83h,
                                                                                                                以84%的产率得到(2R,4R)-2-[(4S,5S)-3-acetyl-4-(3,5-difluoro-benzyl)-2,2-dimethyl-oxazolidin-5-yl]-4-(3-methyl-but-2-enyloxy)-4-trifluoromethyl-pyrrolidine-1-carboxylic acid tert-butyl ester