Process for the synthesis of ivabradine and addition salts thereof with a pharmaceutically acceptable acid

A process for the synthesis of ivabradine of formula (I):

• wherein a compound of formula (V):
• is subjected to a reductive amination reaction with an amine of formula (VI):
• in the presence of an iron-based catalyst,
• optionally in the presence of trimethylamine N-oxide,
• under dihydrogen pressure of from 1 to 20 bars,
• in an organic solvent or mixture of organic solvents,
• at a temperature from 25 to 100° C.