反应详情

A solution of 2-chlorobenzaldehyde (1.0543 g), ethyl 4,4-diethoxyacetoacetate (1.6477 g) and piperidine (1 to 2 drop(s)) in benzene (30 ml) was refluxed under azeotropic dehydration for 4.5 hours. After cooling, the resultant solution was washed with water and dried. The solvent was removed from the solution to give orange oil (2.7196 g) of ethyl 2-(2-chlorobenzylidene)-4,4-diethoxyacetoacetate. The mixture of the compound obtained above and ethyl 3amino-4,4-diethoxycrotonate (1.6580 g) was heated with stirring at about 100° C. for 1.5 hours and about 120° C. for 8 hours. After cooling, the reaction mixture was dissolved in ethyl acetate. The solution was washed with water and dried, and then the solvent was removed from the solution to give orange oil (4.21 g) of diethyl 2,6-bis(diethoxymethyl)-4-(2-chlorophenyl)-1,4-dihydropyridine-3,5-dicarboxylate. The product was purified by a column chromatography on silica gel with an eluent (benzene: ethyl acetate = 10:1) to give pure product.

1. temperatureAfter cooling
2. washthe resultant solution was washed with water
3. customdried
4. customThe solvent was removed from the solution