[C:1]([O:5][C@@H:6]([CH3:18])[C@H:7]([NH:10][C:11]1[CH:16]=[CH:15][N:14]=[C:13]([Cl:17])[N:12]=1)[CH2:8][OH:9])([CH3:4])([CH3:3])[CH3:2].Cl[C:20](Cl)([O:22]C(=O)OC(Cl)(Cl)Cl)Cl.CC1C=CC=C(C)N=1.CCOC(C)=O.CCCCCCC>C(Cl)Cl.O>[C:1]([O:5][C@H:6]([C@H:7]1[CH2:8][O:9][C:20](=[O:22])[N:10]1[C:11]1[CH:16]=[CH:15][N:14]=[C:13]([Cl:17])[N:12]=1)[CH3:18])([CH3:4])([CH3:2])[CH3:3]To a round bottom flask containing (2R,3S)-3-(tert-butoxy)-2-((2-chloropyrimidin-4-yl)amino)butan-1-ol (1.8 g, 6.58 mmol) and a stir bar under nitrogen was added DCM (66 ml). The resulting reaction mixture cooled to −70° C. in a dry ice/acetone bath. To this cold solution was added triphosgene (1.07 g, 3.62 mmol) followed by the addition of 2,6-dimethylpyridine (3.6 mL, 30.9 mmol). Resulting reaction mixture allowed to gradually warm to room temperature and stirred for 30 min at room temperature. Reaction mixture diluted with DCM and water and allowed to stir 1 hr at room temperature. The phases were then partioned and aqueous extracted with DCM. Organics phases combined, washed with water, brine, dried (Na2SO4), filtered and concentrated onto silica gel. Silica gel column chromatography (EtOAc/Heptane 0 to 100%) provided (R)-4-((S)-1-(tert-butoxy)ethyl)-3-(2-chloropyrimidin-4-yl)oxazolidin-2-one (1.44 g, 4.80 mmol, 73% yield) as a white crystalline. LCMS m/z 300.1 (M+H)+, Rt 0.91 min.
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