ethyl 3-fluoro-5-hydroxypyridine-2-carboxylate   、                                                                                      
((1R)-2,2-difluorocyclopropyl)methyl 4-nitrobenzenesulfonate                                                                                                                                                                                                                                                                                                          以in the same manner as in Example 5, the title compound was obtained的产率得到ethyl 5-(((1R)-2,2-difluorocyclopropyl)methoxy)-3-fluoropyridine-2-carboxylate