| abstract |
The invention relates to a process for the preparation of amplodipine benzenesulfonate of the formula N @ 0 by reacting a derivative of 2 - [(2-N- (2-carboxybenzoyl) -aminoethoxy / methyl] -4- (2-chlorophenyl) -3-ethoxycarbonyl- 5-methoxycarbonyl-6-methyl-1,4-dihydropyridine of the general formula # X in which X is a hydrogen atom or an alkaline or alkaline earth metal or a quaternary ammonium salt, with benzenesulfonic acid |