In this study a kinetic and thermodynamic atropisomeric transformation due to a hindered rotation around the tetrahydroisoquinoline-based amide group was investigated. Quantum chemistry calculations were applied to investigate the transformation under the gas phase and several solvents with different polarity, and then evaluated by dynamic HPLC determination. It was found that the transformation rate of constants and the half-life time varied under the influence of solvent polarity and temperature and the energies of rotational barrier were determined ranging between 87 and 92 kJ∙mol−1. A primary binding study with HSA confirmed a rapid interconversion under the simulated physiological conditions. It is therefore suggested to take this atropisomeric compound as a racemic mixture for its future drug development.