Methyl 4-(aminomethyl)benzoate → methyl 4-[(4-hydroxy-2-methyl-6-oxopyrimidin-1(6H)-yl)methyl]benzoate

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Reaction Steps

To a solution of methyl 3-({(1Z)-1-[(2-naphthylmethyl)thio]ethylidene}amino)-3-oxopropanoate (1.9 g, 0.006 mol, from step 1) in THF (25.0 mL), at 0° C., is added methyl-4-aminomethylbenzoate (1.1 g, 0.0067 mol). The reaction mixture is stirred at room temperature for 1 hour, and then concentrated to dryness. The resulting residue is dissolved in dioxane (20.0 mL), DBU (0.1 mL) is added, and the resulting reaction mixture is heated at 70° C. for 1 h under an argon atmosphere. After removing the solvent under reduced pressure, the residue 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=275) are combined and freeze-dried to afford the title compound (0.33 g) as a white powder: 1H NMR (CD3OD/400 MHz) δ 7.99 (d 2H, J=8.4 Hz), 7.29 (d, 2H, J=8.4 Hz), 5.42 (s, 1H), 5.36 (s, 2H), 3.88 (s, 3H), and 2.42 (s, 3H); ES-HRMS m/z 275.1021 (M+H calcd for C14H15N2O4 requires 275.1026).

Provenance & Evidence