Gamma-Aminobutyric Acid → 1-Cyclopropyl-3-(3-fluoro-4-(2-(6-((2-oxopyrrolidin-1-yl)methyl)pyridin-3-yl)thieno[3,2-b]pyridin-7-yloxy)phenyl)urea

Participants

Reaction Steps

To a stirred solution of aldehyde 282 (0.5 g, 1.115 mmol) and AcOH (128 μl, 2.23 mmol) in DMF (10 mL) was added 4-aminobutyric acid (345 mg, 3.34 mmol). After 40 min, sodium triacetoxyborohydride (945 mg, 4.46 mmol) was added and the reaction was stirred at RT for 22 h. The reaction mixture was then diluted with water to form a precipitate that was collected by filtration, dried under vacuum and purified by Biotage (SNAP 50 g cartridge; 2% of ammonium hydroxide in MeOH/DCM: 0/100 to 15/85 over 20 CV) and by Gilson (Phenomenex, Luna 15 μl, C18(2) 100A, 250×50.0 mm, 15 μm; 0.05% of formic acid in both MeOH/water:30/80 to 95/5 over 60 min, flow; 30 mL/min), to afford the title compound 283 (20 mg, 0.04 mmol, 3% yield) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ (ppm): 9.28 (s, 1H), 9.06 (d, J=2.4 Hz, 1H), 8.53 (d, J=5.6 Hz, 1H), 8.42 (bs, 1H), 8.26 (dd, J=2.4 and 8.0 Hz, 1H), 8.25 (s, 1H), 7.74 (dd, J=2.0 and 13.6 Hz, 1H), 7.41-7.34 (m, 2H), 7.24-7.20 (m, 1H), 7.08 (bs, 1H), 6.62 (d, J=5.6 Hz, 1H), 4.53 (s, 2H), 2.58-2.51 (m, 1H), 2.32 (t, J=8.0 Hz, 2H), 1.98 (quin, J=7.2 Hz, 2H), 0.65-0.60 (m, 2H), 0.45-0.40 (m, 2H). MS (m/z): 518.5 (M+H).

Provenance & Evidence