反应详情

{1-[3-(aminocarbonyl)phenyl]-4-hydroxy-6-oxo-1,6-dihydropyridin-2-yl}methyl acetate (crude from step 1) (3.61 g, 11.94 mmol) was dissolved in N,N-dimethylformamide (40 mL). K2CO3 (3.80 g, 27.46 mmol) was added followed by 2,4-difluorobenzyl bromide (5.44 g, 26.27 mmol). The reaction mixture was stirred for 48 hours at room temperature. The reaction mixture was then partially concentrated and the residue taken up in dichloromethane/tetrahydrofuran 1:1 and filtered. The filtrate was collected, concentrated and the residue tritrated with dichloromethane to afford a tan solid (1.64 g, 32%). 1H NMR (400 MHz, DMF-d6) δ 8.19 (br s, 1H), 8.07 (app dt, J=1.35, 7.66 Hz, 1H), 7.91 (app t, J=1.81 Hz, 1H), 7.76 (app dt, J=6.58, 8.59 Hz, 1H) 7.62 (t, J=7.79 Hz, 1H), 7.55 (ddd, J=1.21, 2.01, 7.79 Hz, 1H), 7.46 (br s, 1H), 7.34 (ddd, J=2.55, 9.40, 10.47 Hz, 1H), 7.23-7.18 (m, 1H), 6.26 (d, J=2.55 Hz, 1H), 6.11 (d, J=2.69 Hz, 1H), 5.23 (s, 2H), 4.62 (AB q, JAB=14.97 Hz, 2H), 1.96 (s, 3H). ES-HRMS m/z 429.1280 (M+H calcd for C22H18F2N2O5 requires 429.1257).

1. concentrationThe reaction mixture was then partially concentrated
2. filtrationfiltered
3. customThe filtrate was collected
4. concentrationconcentrated