Hydrochloric Acid → N-{[6-Hydroxy-1-methyl-2,4-dioxo-3-(phenylmethyl)-1,2,3,4-tetrahydro-5-pyrimidinyl]carbonyl}glycine

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A mixture of ethyl N-{[6-hydroxy-2,4-dioxo-3-(phenylmethyl)-1,2,3,4-tetrahydro-5-pyrimidinyl]carbonyl}glycinate (295 mg, 0.85 mmoles), methyl iodide (62 uL, 1.0 mmoles) and sodium carbonate (320 mg, 3.0 mmoles) in dimethylformamide (5.0 mL) was stirred under argon at 100° C. for 2.5 hours. The mixture was cooled, poured into 1 molar hydrochloric acid and extracted with ethyl acetate (×2). The ester was hydrolysed by stirring in a mixture of ethanol (5 mL) and 1 molar sodium hydroxide solution (4 mL) for 4 hours. The mixture was acidified and extracted with ethyl acetate. Purification by preparative HPLC (acetonitrile-water—0.1% TFA, 20-100%) and crystallization from ether-hexane gave the title compound (80 mg, 28%). 1H NMR (400 MHz, DMSO-d6) δ ppm 13.11 (br. s., 1 H), 10.09 (br. s., 1 H), 7.28-7.36 (m, 4 H), 7.19-7.29 (m, 1 H), 5.01 (s, 2 H), 4.14 (d, J=5.81 Hz, 2 H), 3.21 (s, 3 H).

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