PROCESS FOR THE PREPARATION OF NOVEL 1,4-DIHYDROPYRIDINE DERIVATIVES WITH CALCIUM AGONIST AND ALPHA 1-ANTAGONIST ACTIVITY AND OF PHARMACEUTICAL COMPOSITIONS CONTAINING THE SAME

摘要

1,4-Dihydropyridine derivatives which combine both calcium agonist and alpha1-antagonist activity are useful in treating congestive heart failure. These derivatives are compounds having the formula: CHEM wherein Ar, R3, R4, R5 and R6 are defined in the specification.