(3-amino-2',4'-difluoro-biphenyl-4-yl)-carbamic acid tert.-butyl ester 、
tert-butyl 3-(2-cyanopyridin-4-yl)-3-oxopropanoate 以Obtained as a light brown solid (207 mg)的产率得到{3-[3-(2-cyano-pyridin-4-yl)-3-oxo-propionylamino]-2',4'-difluoro-biphenyl-4-yl}-carbamic acid tert.-butyl ester