反应详情

A mixture of ethyl N-[(1-cyclohexyl-6-hydroxy-2,4-dioxo-1,2,3,4-tetrahydro-5-pyrimidinyl)carbonyl]glycinate (340 mg, 1.0 mmoles), pulv. Potassium carbonate (740 mg, 5.35 mmoles) and 2,4-dimethylbenzyl bromide (400 mg, 2.0 mmoles) in dimethylformamide (5 mL) was vigorously stirred at 100° C. for 3 hours. The mixture was poured into 1 molar hydrochloric acid and extracted with ethyl acetate. The organic solution was washed with 1 molar hydrochloric acid and evaporated. The residue was purified by flash chromatography (10-50% ethyl acetate in hexane), the required fractions evaporated, dissolved in ethanol (5 mL) and 1 molar sodium hydroxide solution (1.0 mL) and 6 molar sodium hydroxide solution (1.0 mL) added. The mixture was stirred overnight, acidified and extracted with ethyl acetate (×2), the combined extracts washed with 1 molar hydrochloric acid, dried and evaporated to give the title compound (173 mg, 40%). 1H NMR (400 MHz, DMSO-d6) δ ppm 13.10 (br. s., 1 H), 10.15 (br. s., 1 H), 2.31 (s, 3 H), 2.18-2.29 (m, 5 H), 1.78 (d, J=13.14 Hz, 2 H), 1.62 (d, J=10.36 Hz, 3 H), 1.28 (q, J=12.72 Hz, 2 H), 1.12 (t, J=12.88 Hz, 1 H).

1. extractionextracted with ethyl acetate
2. washThe organic solution was washed with 1 molar hydrochloric acid
3. customevaporated
4. customThe residue was purified by flash chromatography (10-50% ethyl acetate in hexane)
5. customthe required fractions evaporated
6. dissolutiondissolved in ethanol (5 mL)
7. addition1 molar sodium hydroxide solution (1.0 mL) and 6 molar sodium hydroxide solution (1.0 mL) added
8. extractionextracted with ethyl acetate (×2)
9. washthe combined extracts washed with 1 molar hydrochloric acid
10. customdried
11. customevaporated