Hydrochloric Acid → (R)-1-(3-fluoro-5-(1,1,2,2-tetrafluoroethoxy)phenyl)-1-(4-fluorophenyl)-2-(2-methyl-2H-tetrazol-5-yl)ethanamine

Participants

Reaction Steps

To a solution of (R)—N—((R)-1-(3-fluoro-5-(1,1,2,2-tetrafluoroethoxy)phenyl)-1-(4-fluorophenyl)-2-(2-trityl-2H-tetrazol-5-yl)ethyl)-2-methylpropane-2-sulfinamide (60 mg, 0.079 mmol) in MeOH (3 mL) was added 4 N HCl in dioxane (1 mL). The reaction mixture was stirred at room temperature for 20 min, then concentrated to yield (R)-1-(3-fluoro-5-(1,1,2,2-tetrafluoroethoxy)phenyl)-1-(4-fluorophenyl)-2-(2H-tetrazol-5-yl)ethanamine LCMS: RT=2.66 min [M+H] 418.55 (Phenomenex Luna C18 4.6×50 mm column, eluting with 10-90% MeOH/H2O containing 0.1% TFA, 4 min gradient, flow rate 4 mL/min, wavelength 220 nm). To a solution of ((R)-1-(3-fluoro-5-(1,1,2,2-tetrafluoroethoxy)phenyl)-1-(4-fluorophenyl)-2-(2H-tetrazol-5-yl)ethanamine in THF (3 mL) and MeOH (0.5 mL) was added (diazomethyl)trimethylsilane (2.0 M in hexanes, 0.05 mL). After stirring at room temperate for 20 min, the reaction mixture was concentrated and purified by ISCO flash column chromatography (silica gel, EtOAc) to give ((R)-1-(3-fluoro-5-(1,1,2,2-tetrafluoroethoxy)phenyl)-1-(4-fluorophenyl)-2-(2-methyl-2H-tetrazol-5-yl)ethanamine (10 mg, yield: 30%). LCMS: RT=2.83 min [M+H] 432.57 (Phenomenex Luna C18 column, 4.6×50 mm eluting with 10-90% MeOH/H2O over 4 minutes containing 0.1% TFA; 4 mL/min, monitoring at 220 nm).

Provenance & Evidence