Sodium Carbonate → (S)-isopropyl 2-(tert-butoxy)-2-(4-(3,3-difluoroazetidin-1-yl)-5-(4-(4-fluorophenethoxy)phenyl)-2,6-dimethylpyridin-3-yl)acetate

Participants

Reaction Conditions

Reaction Steps

The Pd(Ph3P)4 (43.2 mg, 0.037 mmol) was added to a nitrogen purged and degassed solution of (S)-isopropyl 2-(5-bromo-4-(3,3-difluoroazetidin-1-yl)-2,6-dimethylpyridin-3-yl)-2-(tert-butoxy)acetate (84 mg, 0.187 mmol), (4-(4-fluorophenethoxy)phenyl)boronic acid (53.5 mg, 0.206 mmol), and sodium carbonate (139 mg, 1.31 mmol) in dioxane (2 mL) and water (0.15 mL) and stirred in a screw-capped pressure vessel for 4 h at 90° C. The reaction was allowed to cool, diluted with EtOAc, and the organic layer was washed with brine and dried (Na2SO4). The crude product was charged (DCM) to a 24 g ISCO silica gel cartridge and gradient elution (5-65% EtOAc/hexanes) using an Isolera chromatography station gave (S)-isopropyl 2-(tert-butoxy)-2-(4-(3,3-difluoroazetidin-1-yl)-5-(4-(4-fluorophenethoxy)phenyl)-2,6-dimethylpyridin-3-yl)acetate 60 mg (55%). 1H NMR (500 MHz, DMSO-d6) δ 7.40-7.37 (m, 2H), 7.29 (d, J=8.1 Hz, 1H), 7.14 (t, J=8.8 Hz, 2H), 7.04-6.95 (m, 3H), 5.22 (s, 1H), 5.01-4.95 (m, 1H), 4.23 (t, J=7.0 Hz, 2H), 4.07-4.00 (m, 2H), 3.87-3.80 (m, 2H), 3.06 (t, J=7.0 Hz, 2H), 2.35 (s, 3H), 2.05 (s, 3H), 1.21 (d, J=6.2 Hz, 3H), 1.18 (d, J=6.2 Hz, 3H), 1.12 (s, 9H). UPLC (M+H)=586.4.

Provenance & Evidence