307 mg (0.77 mmol) of 5-(2-propene-1-yl) 3-(2-cyanoethyl) 4-(3-chlorophenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate, 278 mg (0.92 mmol) of 2-cyanoethyl 4-iodobenzoate, 19 mg(0.08 mmol) of palladium acetate and 0.14 ml (1.0 mmol) of triethylamine were heated at 100° C. under stirring in 5 ml of DMF overnight. Water was added to the reaction mixture. After the extraction with ethyl acetate, the organic layer was dried over anhydrous sodium sulfate and then concentrated under reduced pressure. The residue was purified by the silica gel chromatography (hexane/ethyl acetate=2/1) to obtain the title compound.
