tert-butyl [(1S)-2-({6-[(2,4-dihydroxyphenyl)carbamoyl]-5-fluoropyridin-3-yl}oxy)-1-methylethyl]carbamate   、                                                                                      
3,3-difluorobutyl methanesulfonate                                                                                                                                                                                                                                                                                                          以in the same manner as in Example 2, steps C-D, the title compound was obtained的产率得到tert-butyl [(1S)-2-({6-[6-(3,3-difluorobutoxy)-1,3-benzoxazol-2-yl]-5-fluoropyridin-3-yl}oxy)-1-methylethyl]carbamate