4-Methylmorpholine → (+/-) 3-[5-bromo-4-[(2,4-difluorobenzyl)oxy]-2-methyl-6-oxopyrimidin-1(6H)-yl]-4-methyl-N-{1-[(methylamino)carbonyl]methyl}benzamide

Participants

Reaction Conditions

Reaction Steps

To a solution of 3-[5-bromo-4-[(2,4-difluorobenzyl)oxy]-2-methyl-6-oxopyrimidin-1(6H)-yl]-4-methylbenzoic acid (1.0 g, 0.022 mol) in dimethylacetamide (10.0 mL) at −20° C. was added isobutylchloroformate (0.36 g, 0.0028 mol), followed by dropwise addition of N-methylmorpholine (0.30 g, 0.003 mol) and stirred for 10 min under nitrogen atmosphere. The reaction mixture was then stirred at room temperature for 20 min, cooled to 0° C., and added N-methylmorpholine (0.30 g, 0.003 mol) followed by the addition of N-methylglycine amide hydrochloride (0.35 g, 0.0028 mol) and DMAP (0.025 g). The reaction mixture was stirred at room temperature for 4 h, and concentrated in vacuo. The resulting the residue was 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=535) were combined, and freeze-dried to give a white solid. This was dissolved in dichloromethane (25 mL), washed successively with 5% sodium bicarbonate (2×20 mL), water (2×20 mL), dried (Na2SO4), and concentrated to dryness to afford the racemic title compound (0.75 g, 65%) as a white amorphous substance: 1H NMR (CD3OD/400 MHz) δ 7.96 (dd 1H, J=1.6 Hz, 8.0 Hz), 7.72 (d, 1H, J=1.6 Hz), 7.62 (m, 1H), 7.56 (d, 1H, J=8.0 Hz), 7.01 (m, 2H), 5.55 (abq, 2H), 3.99 (s, 2H), 2.74 (s, 3H), 2.18 (s, 3H), and 2.14 (s, 3H); ES-HRMS m/z 535.0792 (M+H calcd for C23H22N4O4F2Br requires 535.0787). 19F NMR(CD3OD/400 MHz) −111.85 (m) and −115.91 (m).

Provenance & Evidence