Potassium Carbonate → tert-butyl 4-[2,4-difluoro-5-(isobutyrylamino)phenyl]-3,6-dihydro-1(2H)-pyridinecarboxylate

Participants

Reaction Conditions

Reaction Steps

To a 250-mL RB flask containing tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydro-1(2H)-pyridinecarboxylate (3.31 g, 10.7 mmol), K2CO3 (4.44 g, 32.1 mmol) and PdCl2dppf (870 mg, 1.07 mmol) was added a solution of N-(5-bromo-2,4-difluorophenyl)-2-methylpropanamide (3.28 g, 11.8 mmol) in DMF (100 mL) at room temperature under argon. The mixture was heated to 80° C. under argon overnight, cooled to room temperature, filtered through celite and the celite was washed with EtOAc (3×20 mL). The filtrates were washed with H2O (20 mL), brine (20 mL), dried over MgSO4, filtered and concentrated in vacuo. The crude material was purified by flash chromatography (10%–20% EtOAc/hexane) to give 2.4 g (6.31 mmol, 59%) of tert-butyl 4-[2,4-difluoro-5-(isobutyrylamino)phenyl]-3,6-dihydro-1(2H)-pyridine carboxylate: ESMS m/e: 379.3 (M−H)+.

Provenance & Evidence