235 mg (0.72 mmol) of cesium carbonate are added to a solution of 130 mg (0.29 mmol) of (S)-1-[2-(4-hydroxyphenyl)ethyl]-2-methyl-7-(8-oxa-3-azabicyclo[3.2.1]oct-3-yl)-2-trifluoromethyl-2,3-dihydro-1H-imidazo[1,2-a]pyrimidin-5-one in 10 mL of DMF. After heating at 80° C. for 20 minutes, 52.60 mg (0.43 mmol) of 2-chloro-N,N-dimethylacetamide and 43.30 mg (0.29 mmol) of sodium iodide are added. The reaction medium is heated at 80° C. overnight. The reaction medium is evaporated to dryness. After purification by chromatography on silica gel (eluent A/B: DCM/MeOH, gradient A/B: t 0 min 0% B, t 25 min 10% B, t 30 min 10% B), 138 mg of N,N-dimethyl-2-(4-{2-[(S)-2-methyl-7-(8-oxa-3-azabicyclo[3.2.1]oct-3-yl)-5-oxo-2-trifluoromethyl-2,3-dihydro-5H-imidazo[1,2-a]pyrimidin-1-yl]ethyl}phenoxy)acetamide were obtained, corresponding to the following characteristics:
