反应详情

A mixture of Example 230 (65 mg, 0.15 mmol), N-hydroxy-acetamidine (14 mg, 0.18 mmol) in 1 mL of DMF was treated with DIC in 1 mL of CH2Cl2 at 0° C. The reaction mixture was stirred overnight and partitioned between EtOAc and water. The organic layer was separated, washed with brine, dried (MgSO4), filtered, and concentrated under vacuum. The residue was purified by flash column chromatography on silica gel with 100:1 ethyl acetate/MeOH to provide the desired product. MS (DCI) m/e 490 (M+H)+; 1H NMR (500 MHz, DMSO-d6) δ 9.83 (s, 1H), 8.01 (d, J=8.29 Hz, 1H), 7.94 (s, 1H), 7.79 (d, J=8.29 Hz, 1H), 7.52 (d, J=1.23 Hz, 1H), 7.33-7.34 (m, 2H), 7.29 (m, 1H), 6.93 (m, 1H), 6.83-6.85 (m, 2H), 6.27 (s, 2H), 4.03 (s, 3H), 2.73-2.76 (m, 2H), 2.58-2.62 (m, 2H), 1.72 (s, 3H).

1. custompartitioned between EtOAc and water
2. customThe organic layer was separated
3. washwashed with brine
4. dry with materialdried (MgSO4)
5. filtrationfiltered
6. concentrationconcentrated under vacuum
7. customThe residue was purified by flash column chromatography on silica gel with 100:1 ethyl acetate/MeOH