(2R,4R/S)-4-(3-ethyl-4-fluoro-2-methoxyphenyl)-2-hydroxy-2-(trifluoromethyl)hexanal 、
5-amino-7-fluoro-1H-quinolin-2-one 在
titanium(IV) tetrabutoxide 作用下,
以to give 5-{[(2R,4R/S)-4-(3-ethyl-4-fluoro-2-methoxyphenyl)-2-hydroxy-2-(trifluoromethyl)hexylidene]amino}-7-fluoroquinolin-2(1H)-one的产率得到5-{[(2R,4R/S)-4-(3-ethyl-4-fluoro-2-methoxyphenyl)-2-hydroxy-2-(trifluoromethyl)hexylidene]amino}-7-fluoroquinolin-2(1H)-one