反应详情

温度

60 °C

To a solution of 7-benzyl-3-ethyl-8-(3-(trifluoromethoxy)phenoxy)-1H-purine-2,6(3H,7H)-dione (40 mg, 0.090 mmol, intermediate 47) in DMF (3 mL) was added 5-(chloromethyl)isoxazole (30 mg, 0.256 mmol), followed by potassium carbonate (50 mg, 0.362 mmol) and TBAI (5 mg, 0.014 mmol). The reaction was stirred at 60° C. overnight. The mixture was cooled and partitioned between ethyl acetate and water. The organic phase was washed with brine, dried over sodium sulfate, and concentrated to give a crude product, which was purified by preparative HPLC to give 7-benzyl-3-ethyl-1-(isoxazol-5-ylmethyl)-8-(3-(trifluoromethoxy)phenoxy)-1H-purine-2,6(3H,7H)-dione (5.9 mg, 12.6% yield) as white solid. 1H-NMR (CD3OD) δ 8.33-8.32(d, 1H), 7.57-7.53(t, 1H), 7.47-7.45(d, 2H), 7.38-7.31(m, 5H), 7.25-7.23(d, 1H), 6.34-6.33(dd, 1H), 5.52(s, 2H), 5.36(s, 2H), 4.06-4.01(q, 2H), 1.27-1.24(t, 3H). LCMS retention time 3.269 min; LCMS MH+528.

1. temperatureThe mixture was cooled
2. custompartitioned between ethyl acetate and water
3. washThe organic phase was washed with brine
4. dry with materialdried over sodium sulfate
5. concentrationconcentrated
6. customto give a crude product, which
7. customwas purified by preparative HPLC