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