2-Aminopyridine → 3-Chloro-4-((pyridin-2-ylamino)methyl)benzaldehyde

Participants

Reaction Steps

To a stirred solution of 4-(bromomethyl)-3-chlorobenzaldehyde (2 g, 9 mmol) in N,N-dimethylacetamide (DMA; 20 mL) was added K2CO3 (2.36 g, 17.16 mmol) and 2-aminopyridine (0.84 g, 8.58 mmol), and the reaction mixture was stirred at ambient temperature for 4 h. The reaction mixture was diluted with H2O and extracted with EtOAc. The combined organic layer was washed with brine, dried over Na2SO4, and concentrated under reduced pressure. The residue was purified by flash column chromatography (SiO2, 100-200 mesh; 20% EtOAc in n-Hexane) to afford the title compound as off-white solid (1.05 g, 50%): mp 122-123° C.; 1H NMR (400 MHz, CDCl3) δ 9.94 (s, 1H), 8.11 (s, 1H), 7.88 (s, 1H), 7.72 (d, J=4.8 Hz, 1H), 7.62 (d, J=5.7 Hz, 1H), 7.4 (m, 1H), 6.64 (d, J=3.9 Hz, 1H), 6.38 (d, J=6.3 Hz, 1H), 5.04 (br s, 1H), 4.71 (s, 2H); ESIMS m/z 246.97 ([M+H]+).

Provenance & Evidence