Sodium Carbonate → 3-Chloro-2',5'-difluoro-N-[(oxan-4-yl)methyl][2,4'-bipyridin]-6-amine

Participants

Reaction Conditions

Reaction Steps

6-bromo-5-chloro-N-((tetrahydro-2H-pyran-4-yl)methyl)pyridin-2-amine (0.500 g, 1.64 mmol), 2,5-difluoropyridin-4-ylboronic acid (0.260 g, 1.64 mmol), and sodium carbonate (2.45 ml, 4.91 mmol, 2 M in H2O) were dissolved in DME (7.36 ml). The solution was then degassed by sparging with argon for 5 min. It was then treated with PdCl2(dppf)CH2Cl2 adduct (0.267 g, 0.327 mmol). The reaction mixture was then heated in the microwave at 105° C. for 25 min. More boronic acid (0.260 g, 1.64 mmol) and PdCl2(dppf)CH2Cl2 adduct (0.267 g, 0.327 mmol), and H2O (˜2 ml) were added. Heating in the microwave was continued at 110° C. for 30 min. The reaction mixture was then filtered through a pad of Celite. The filtrate was then concentrated in vacuo to give 1.2090 g of crude product. The resulting residue was subjected to silica gel column chromatography. Elution using 10 EtOAc/90 heptane to 80 EtOAc/20 heptane gave 0.3584 g (65%) of 3-chloro-2′,5′-difluoro-N-((tetrahydro-2H-pyran-4-yl)methyl)-2,4′-bipyridin-6-amine. LCMS (m/z): 340.0 (MH+), retention time=0.90 min. 1H NMR (400 MHz, CHLOROFORM-d) d ppm 1.37 (qd, 3H) 1.60 (br. s., 2H) 1.68 (d, J=12.91 Hz, 3H) 1.84 (ddd, J=11.15, 7.24, 4.30 Hz, 1H) 3.21 (t, J=6.26 Hz, 2H) 3.32-3.45 (m, 3H) 4.00 (dd, J=11.15, 3.72 Hz, 2H) 4.74 (br. s., 1H) 6.45 (d, J=9.00 Hz, 1H) 6.99-7.07 (m, 1H) 7.51 (d, J=8.61 Hz, 1H) 8.12 (s, 1H).

Provenance & Evidence