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-bromo-1-(bromomethyl)-4-(1,1-dimethylethyl)benzene (612 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 (×2). The combined organic solutions were 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 (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. Preparative HPLC (50-90% acetonitrile-water-0.1% TFA) gave the title compound (40 mg, 7.5%). 1H NMR (400 MHz, DMSO-d6) δ ppm 13.17 (br. s., 1 H), 10.14 (br. s., 1 H), 7.59 (d, J=1.52 Hz, 1H), 7.33 (dd, J=8.08, 1.52 Hz, 1 H), 6.92 (d, J=8.08 Hz, 1 H), 4.96 (s, 2 H), 4.65 (t, J=11.75 Hz, 1H), 4.13 (d, J=5.56 Hz, 2 H), 2.25 (q, J=11.54 Hz, 2 H), 1.79 (d, J=12.13 Hz, 2 H), 1.53-1.73 (m, 3 H), 1.20-1.38 (m, 11 H), 1.11 (q, 1 H)

1. extractionextracted with ethyl acetate (×2)
2. washThe combined organic solutions were 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 (1.0 mL) added
8. extractionextracted with ethyl acetate (×2)
9. washthe combined extracts washed with 1 molar hydrochloric acid
10. customdried
11. customevaporated