Sodium Bicarbonate → Cinacalcet Hydrochloride

Participants

Reaction Conditions

Reaction Steps

(R)-3-chloro-N-(1-(naphthalen-1-yl)ethyl)-3-(3-(trifluoromethyl)phenyl)propan-1-amine hydro-chloride (X) (15.0 g, 35.021 mmol) is suspended in toluene (90 ml) at 15°-20° C. and sat. aq. sodium bicarbonate (75.6 g, X72 mmol) is charged drop-wise, under vigorous stirring, until pH=8-9 of the aqueous layer. The mixture is layered upon standing few minutes and then the organic phase is separated, washed with water (2×75 ml) and transferred into an autoclave. 5% Palladium on carbon (50% moisture content) is added (0.373 g, 0.088 mmol), followed by methanol (15 ml), the mixture is exposed to inert atmosphere, then pressurized with 100 kPa hydrogen gas, upon stirring at 20° C. Hydrogen pressure is maintained until positive IPC (via HPC, about 4-5 hrs), then the reaction mixture is filtered through a Celite® pad. Methanol is distilled off the filtered solution and isopropyl acetate (IPAC) (90 ml) is added. The resulting suspension is heated up to 70° C. and stirred for 30 minutes, then cooled down slowly to 0° C. Cinacalcet hydrochloride is isolated as a white powder upon filtration, washing with IPAC (2×15 ml) and exsiccation at 60*-65° C. under vacuum (11.4 g, 28.944 mmol; yield: 82.6%).

Provenance & Evidence