2,6-Lutidine → (R)-4-((R)-1-(tert-butoxy)ethyl)-3-(6-fluoro-2-(((S)-1-(1-(4-fluorophenyl)-1H-pyrazol-4-yl)ethyl)amino)pyrimidin-4-yl)oxazolidin-2-one

Participants

Reaction Steps

Triphosgene (18 mg, 0.062 mmol, 0.5 equiv) was added to a solution of (2R,3R)-3-(tert-butoxy)-2-((6-fluoro-2-(((S)-1-(1-(4-fluorophenyl)-1H-pyrazol-4-yl)ethyl)amino)pyrimidin-4-yl)amino)butan-1-ol (57 mg, 0.12 mmol) in DCM (1.2 mL) at −78° C., followed by the dropwise addition of 2,6-lutidine (0.058 mL, 0.49 mmol, 4 equiv). The solution was allowed to warm to room temperature and was then heated at 35° C. for 30 min. The reaction was then cooled to room temperature and diluted with DCM (30 mL) and saturated aqueous sodium chloride (30 mL). The layers were separated and the organic layer was dried over Na2SO4, filtered and concentrated to give crude (R)-4-((R)-1-(tert-butoxy)ethyl)-3-(6-fluoro-2-(((S)-1-(1-(4-fluorophenyl)-1H-pyrazol-4-yl)ethyl)amino)pyrimidin-4-yl)oxazolidin-2-one, which was used without further purification. MS m/z 487.4 (M+H)+; Rt-1.12 min.

Provenance & Evidence