(2E)-2-[(6-Fluoro-3-methyl-1H-indazol-5-yl)methylidene]-3-oxobutanenitrile 、
3-amino-4,4-difluorobut-2-enenitrile 在
crude product 、
acetonitrile-water 、 final mixture 作用下,
以to yield 50 mg (35% of th.) of the racemic title compound的产率得到rac-2-(difluoromethyl)-4-(6-fluoro-3-methyl-1H-indazol-5-yl)-6-methyl-1,4-dihydropyridine-3,5-dicarbonitrile