(+/-)-1-(2-amino-6-chlorophenyl)-2-(3,4-difluorophenyl)ethanol   、                                                                                      
乙酸乙酯                                                                                                                                                                                              以
                                                                                         hexanes                                                                                  为溶剂,
                                                                                                                                                                                        以to afford 0.21 g (64%) of (±)-5-chloro-4-(3,4-difluorobenzyl)-1,4-dihydro-2H-3,1-benzoxazin-2-one after flash chromatography (4:1 hexanes:ethyl acetate)的产率得到(+/-)-5-chloro-4-(3,4-difluorobenzyl)-1,4-dihydro-2H-3,1-benzoxazin-2-one