tert-butyl ((2S)-1-((2-(4-(benzyloxy)-3-fluorophenyl) [1,3]oxazolo[5,4-d]pyrimidin-5-yl)oxy)propan-2-yl)carbamate 、
((1R)-2,2-difluorocyclopropyl)methyl 4-nitrobenzenesulfonate 以in the same manner as in Step A of Example 4 and Example 5, the title compound was obtained的产率得到tert-butyl ((2S)-1-((2-(4-(((1R)-2,2-difluorocyclopropyl)methoxy)-3-fluorophenyl)[1,3]oxazolo[5,4-d]pyrimidin-5-yl)oxy)propan-2-yl)carbamate