Sodium Bicarbonate → 2-(3-{[2,2-Difluoro-2-(4-fluoronaphthyl)ethyl]amino]-6-chloro-2-fluorophenyl)ethanol

Temperature

77.5 °C

To a solution of N-[4-chloro-2-fluoro-3-(2-hydroxyethyl)phenyl]-2,2-difluoro-2-(4-fluoronaphthyl)acetamide (1.9 g, 4.6 mmol), as prepared in the preceding step, in THF (19 mL) at 0° C. was added dropwise a solution of BH3.THF complex (19.4 mL, 19.4 mmol, 1.0 M in THF) over a period of 20 minutes, and the reaction mixture continued to stir until the ice bath expired. The mixture was then heated at reflux in an oil bath at 75 to 80° C. for 3 hours, and continued to stir at ambient temperature overnight. A solution of NaHCO3 (1.63 g, 19.4 mmol) in H2O (20 mL) was added, the THF was evaporated, and the resulting mixture was extracted with DCM twice. The extracts were combined, washed with H2O and brine, dried over Na2SO4, concentrated, and flash chromatographed on silica gel eluting with EtOAc/DCM (0, 1, 1.5%) to give the title compound (805 mg, 44% yield) as a white solid. 1H-NMR (400 MHz, CDCl3) δ 8.24-8.19 (m, 2H), 7.70-7.61 (m, 3H), 7.14 (t, J=9.3 Hz, 1H), 6.90 (dd, J=8.7, 1.6 Hz, 1H), 6.42 (t, J=8.9 Hz, 1H), 4.22-4.16 (m, 1H), 4.00 (dt, J=13.4, 6.8 Hz, 2H), 3.82 (dd, J=12.1, 6.4 Hz, 2H), 3.02 (dt, J=6.8, 2.3 Hz, 2H), 1.39 (br s, 1H). Mass spectrum (LCMS, ESI) calc'd for C20H17ClF4NO (M+H): 398.1. Found: 398.3.

1. temperatureThe mixture was then heated
2. customthe THF was evaporated
3. extractionthe resulting mixture was extracted with DCM twice
4. washwashed with H2O and brine
5. dry with materialdried over Na2SO4
6. concentrationconcentrated
7. customflash chromatographed on silica gel eluting with EtOAc/DCM (0, 1, 1.5%)

ORD record

ord-e52b8fa468ff47ec92520c695677b3bc

Source dataset

uspto-grants-2005_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06900231B2