Synthesis process ivabradine and addition salts with a pharmaceutically acceptable acid.

Synthesis process of the compound of formula (VIII), under a racemic or optically active form: wherein the compound of formula (II), in racemic or optically active form: is reacted with the compound of formula (IX): presence of a salt of a transition metal or a lanthanide, in a solvent, to yield the compound of formula (X), in racemic or optically active form: which is converted into the compound of formula (VIII) by the action a hydride donor agent.