The invention relates to a synthesis method of 4-(4-cyano-2-methoxyphenyl)-5-ethoxy-1, 4-dihydro-2, 8-dimethyl-1, 6-naphthyridine-3-
formamide, which comprises the following four steps: carrying out a
Knoevenagel condensation reaction, carrying out a Hantzsch
dihydropyridine synthesis method, carrying out an O-ethylation reaction and carrying out a deprotection reaction to synthesize the 4-(4-cyano-2-methoxyphenyl)-5-ethoxy-1, 4-dihydro-2, 8-dimethyl-1, 6-naphthyridine-3-
formamide, and carrying out a reaction to obtain the 4-(4-cyano-2-methoxyphenyl)-5-ethoxy-1, 4-dihydro-2, 8-dimethyl-1, 6-naphthyridine-3-
formamide. The preparation method of the 4-(4-cyano-2-methoxyphenyl)-5-ethoxy-1, 4-dihydro-2, 8-dimethyl-1, 6-naphthyridine-3-formamide has the advantages that the selectivity is high, the post-treatment is simple, the yield and the purity of the product are high, a new synthesis
route and method are developed for synthesizing the 4-(4-cyano-2-methoxyphenyl)-5-ethoxy-1, 4-dihydro-2, 8-dimethyl-1, 6-naphthyridine-3-formamide, the amplified production is conveniently realized, and the method is suitable for industrial production. The method has good application potential and research value.