[5-{2-[(N-cyclopropanecarbonyl-N-ethylamino)methyl]-4-trifluoromethylphenyl}-6-(2,2,2-trifluoroethoxy)pyridin-3-yl]acetic acid ethyl ester 、 [5-{2-[(N-cyclopropanecarbonyl-N-ethyl-amino)-methyl]-4-trifluoromethyl-phenyl}-6-oxo-1-(2,2,2-trifluoro-ethyl)-1,6-dihydro-pyridin-3-yl]-acetic acid ethyl ester 在
desired product 、
2-[5-[2-[[Cyclopropanecarbonyl(ethyl)amino]methyl]-4-(trifluoromethyl)phenyl]-6-oxo-1-(2,2,2-trifluoroethyl)pyridin-3-yl]acetic acid 作用下,
生成 [5-{2-[(N-cyclopropanecarbonyl-N-ethylamino)methyl]-4-trifluoromethylphenyl}-6-(2,2,2-trifluoroethoxy)pyridin-3-yl]acetic acid