反应详情

Ethyl 1-{[2,4-bis(methyloxy)phenyl]methyl}-6-hydroxy-2,4-dioxo-3-(phenylmethyl)-1,2,3,4-tetrahydro-5-pyrimidinecarboxylate. Diethyl {[(phenylmethyl)amino]carbonyl}propanedioate (820 mg, 2.8 mmoles) was added to a suspension of sodium hydride (60% suspension in mineral oil, 280 mg, 7.0 mmoles) in dry tetrahydrofuran (50 mL) and stirred for 10 minutes under argon. 2,4-dimethoxybenzyl isocyanate (1.0 mL, 6.0 mmoles) was added and the mixture heated under reflux for 3 hours, cooled, acidified with 1 molar hydrochloric acid and extracted with ethyl acetate. Flash chromatography (30% methanol in dichloromethane) afforded the title compound (480 mg, 39%) 1H NMR (400 MHz, DMSO-d6) δ ppm 1.15 (t, J=6.69 Hz, 3 H) 3.71 (s, 3 H) 3.78 (s, 3 H) 4.09 (q, J=5.05 Hz, 1 H) 4.81 (s, 2 H) 4.92 (s, 2 H) 6.40-6.59 (m, 3 H) 6.62-7.26 (m, 5 H).

1. temperaturethe mixture heated
2. temperatureunder reflux for 3 hours
3. temperaturecooled
4. extractionextracted with ethyl acetate