Trifluoroacetic acid → 3-[5-Bromo-4-[(2,4-difluorobenzyl)oxy]-2-methyl-6-oxopyrimidin-1(6H)-yl]-4-methylbenzoic acid

Participants

Reaction Conditions

Reaction Steps

A mixture of methyl 3-[5-bromo-4-[(2,4-difluorobenzyl)oxy]-2-methyl-6-oxopyrimidin-1(6H)-yl]-4-methylbenzoate (0.40 g, 0.00084 mol, from Step 4), and 1.5 N NaOH (0.7 mL, 0.042 g, 0.001 mol) containing dioxane (0.5 mL) is stirred at 55° C. for 30 min. The resulting clear brown solution is cooled in an ice bath, diluted with water (3 mL), acidified with trifluoroacetic acid, and the product is purified by reverse-phase HPLC using 10–90% CH3CN/Water gradient (40 min) at a flow rate of 80 mL/min. The appropriate fractions (MH+, m/z=465) are combined and freeze-dried to afford the title compound (0.17 g, 44%) as a white powder: 1H NMR (CD3OD/400 MHz) δ 8.04 (d, 1H, J=1.6 Hz), 7.87 (d, 1H, J=1.6 Hz), 7.54 (m, 2H), 6.99 (m 2H), 5.56 (s, 2H), 2.15 (s, 3H), and 2.13 (s, 3H); ES-HRMS m/z 465.0256 (M+H calcd for C20H16N2O4F2Br requires 465.0256); 19F NMR(CD3OD/400 MHz) −111.89 (m) and −115.95 (m).

Provenance & Evidence