The present invention relates to a novel and improved process for preparing (4S)-4-(4-cyano-2-methoxyphenyl)-5-ethoxy-2,8-dimethyl-1,4-dihydro-1,6-naphthyridine-3-carboxamide of the formula (I)
本发明涉及一种用于制备式(I)的(4S)-4-(4-
氰基-2-
甲氧基苯基)-5-乙氧基-2,8-二甲基-1,4-二氢-1,6-
萘啉-3-羧酰胺的新型改进工艺。