PROCEDE DE PREPARATION DE (4S)-4-(4-CYANO-2-METHOXYPHENYL)-5-ETHOXY-2,8-DIMETHYL-1,4-DIHYDRO-1,6-NAPHTYRIDINE-3-CARBOXAMIDE ET DE PURIFICATION DE CE DERNIER AFIN DE L'UTILISER ENTANT QUE PRINCIPE ACTIF PHARMACEUTIQUE
The present invention relates to a novel and improved method for the preparation of (4S)-4-(4-cyano-2-methoxyphenyl)-5-ethoxy-2,8-dimethyl-1,4-dihydro-1-6-naphthyridine-3-carboxamide of the formula (I) and of a crystalline modification of said compound.