Diisopropylethylamine → Isopropyl 2-(5-bromo-2,6-dimethyl-4-(4-(trifluoromethyl)piperidin-1-yl)pyridin-3-yl)-2-oxoacetate

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-(trifluoromethyl)piperidine HCl (1.7 g, 8.97 mmol) and DIEA (3.13 mL, 17.9 mmol) in anhydrous CH3CN (15 mL) was added isopropyl 2-(5-bromo-4-chloro-2,6-dimethylpyridin-3-yl)-2-oxoacetate (3.0 g, 8.97 mmol) at rt. The resulting mixture was placed in a pre-heated oil bath (80° C.) and stirred for 24 h; cooled, diluted with ether, washed with water, brine, and dried (MgSO4). The crude product was charged (DCM) to a 80 g ISCO silica gel cartridge and gradient eluted (5-20% EtOAc/hexanes) using an Isolera chromatography station to give isopropyl 2-(5-bromo-2,6-dimethyl-4-(4-(trifluoromethyl)piperidin-1-yl)pyridin-3-yl)-2-oxoacetate 2.9 g (71%). 1H NMR (500 MHz, CDCl3) δ 5.25-5.20 (m, 1H), 3.54-3.51 (m, 2H), 3.15 (dt, J=12.5, 2.0 Hz, 2H), 2.87 (s, 3H), 2.57 (s, 3H), 2.30-2.23 (m, 1H), 2.02-1.99 (m, 2H), 1.79 (dq, J=12.4, 4.1 Hz, 2H) 1.43 (d, J=6.2 Hz, 6H). UPLC (M+H)=453.2.

Provenance & Evidence