(4S,6S)-4-(2-fluoro-5-iodophenyl)-4-(fluoromethyl)-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-2-amine   、                                                                                      
3-Methyl-5-((trimethylsilyl)ethynyl)isothiazole                                                                                                                                                                                                                                                                                                          以to give (4S,6S)-4-(2-fluoro-5-((3-methylisothiazol-5-yl)ethynyl)phenyl)-4-(fluoromethyl)-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-2-amine as colorless solid的产率得到(4S,6S)-4-(2-fluoro-5-((3-methylisothiazol-5-yl)ethynyl)phenyl)-4-(fluoromethyl)-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-2-amine