Diisopropylethylamine → (S)-N2-((3-Fluoropyridin-2-yl)(4-(trifluoromethyl)phenyl)methyl)pyridine-2,5-dicarboxamide

Participants

Reaction Steps

To a solution of 5-cyanopicolinic acid (93 mg, 0.628 mmol) in DCM (6 mL) were added DIPEA (0.3 mL, 1.722 mmol) and HATU (247 mg, 0.650 mmol). The solution was stirred at rt. After 20 minutes, the reaction was treated with (S)-(3-fluoropyridin-2-yl)(4-(trifluoromethyl)phenyl)methanamine hydrochloride (Intermediate 2) (115 mg, 0.426 mmol). After stirring for 16 h, the reaction was poured into H2O (20 mL). The aqueous layer was back-extracted with DCM (10 mL). The combined DCM layers were concentrated in vacuo and taken up in 3 mL of concentrated sulfuric acid. The mixture was stirred at rt for 4 hours and then was poured into 75 g of ice. After stirring for 1 hour, the reaction was filtered, and the solids were rinsed with H2O. The solids were then taken up in EtOAc (30 mL) and washed with saturated aqueous NaHCO3. The EtOAc layer was concentrated in vacuo to give the title compound as an off-white solid. 1H NMR (CDCl3, 300 MHz) δ ppm 9.93 (d, J=7.5 Hz, 1H), 9.07 (s, 1H), 8.53 (d, J=4.7 Hz, 1H), 8.23-8.27 (m, 2H), 7.61 (d, J=8.3 Hz, 2H), 7.55 (d, J=8.3 Hz, 2H), 7.42 (td, J=8.2, 1.3 Hz, 1H), 7.27-7.35 (m, 1H), 6.69 (dd, J=7.8, 1.9 Hz, 1H), 5.92 (br s, 2H). MS (ESI pos. ion) m/z: 419.9 (M+H).

Provenance & Evidence