1,2-Dichloroethane → Methyl 4-[1,1-difluoro-2-oxo-2-({(1R)-1-[5-(2,2,2-trifluoroethoxy)pyridin-2-yl]ethyl}amino)ethyl]-benzoate

Participants

Reaction Steps

To a solution of 0.400 g (1.72 mmol) difluoro[4-(methoxycarbonyl)phenyl]acetic acid in 3.50 ml CH2Cl2 was added 0.560 g (1.90 mmol) 2-[(1R)-1-ammonioethyl]-5-(2,2,2-trifluoroethoxy)pyridinium dichloride, 0.308 g (2.26 mmol) HOAT, 0.433 g (2.26 mmol) EDC, and 0.911 mL (5.21 mmol) DIEA, After 24.0 h at room temperature, the reaction mixture was diluted with CH2Cl2, washed three times with water, and washed with brine. The organic layer was dried over NaSO4, filtered and concentrated in vacuo. Purification by flash chromatography (1×14 cm silica gel, linear gradient 0-30% EtOAc:hexane) afforded 0.485 g (65%) Methyl 4-[1,1-difluoro-2-oxo-2-({(1R)-1-[5-(2,2,2-trifluoroethoxy)pyridin-2-yl]ethyl}amino)ethyl]-benzoate. 1H NMR (CDCl3, 400 MHz) 8.32 (d, 1H, J=2.84 Hz); 8.10 (d, 2H, J=8.05 Hz); 7.93 (br d, 1H, J=5.95 Hz); 7.71 (d, 2H, J=8.25 Hz); 7.28 (d, 1H, J=2.75 Hz); 7.23 (d, 1H, J=17.12 Hz); 5.19 (m, 1H); 4.41 (q, 2H, J=7.87 Hz); 3.93 (d, 3H, J=0.55 Hz); 1.49 (d, 3H, J=6.68). ESMS+1 for C19H17F5N2O4: 433.1.

Provenance & Evidence