反应详情

温度

0 °C

To a solution of 2-amino-8-cyclopentyl-7-methoxyquinazoline (1.38 g,) in tetrafluoroboric acid (30 mL), sodium nitrite solution (1.16 g in 10 mL of water) was added dropwise at 0° C. The reaction mixture was stirred at 0° C. for 1 hour and at room temperature for 18 hours. The reaction mixture was cooled in a ice bath and neutralized with 30% ammonia solution. The product was extracted with ethyl acetate (3×50 mL), combined organic extract was washed with brine and dried over anhydrous sodium sulfate. The solvent was removed under reduced pressure to give the title compound as a orange solid (1.0 g, 73%). mp 201–204° C.; 1H NMR (CDCl3): δ 1.7–2.0 (complex, 8H, 4×CH2), 3.43 (m, 1H, CH), 3.96 (s, 3H, OCH3), 6.89 (d, 1H, Ar-H, J=8.8 Hz), 7.59 (d, 1H, Ar-H, J=8.8 Hz), 8.92 (brs, 1H, NH), 9.03 (s, 1H, Ar-H).

1. temperatureThe reaction mixture was cooled in a ice bath
2. extractionThe product was extracted with ethyl acetate (3×50 mL)
3. extractioncombined organic extract
4. washwas washed with brine
5. dry with materialdried over anhydrous sodium sulfate
6. customThe solvent was removed under reduced pressure