反应详情

To a stirred solution of compound 5 (200 mg, 0.40 mmol) in CH2Cl2 (10 mL) under inert atmosphere was added TFA (0.8 mL) at 0° C.; warmed to RT and stirred for 12 h. The reaction was monitored by TLC; after completion of the reaction, the volatiles were removed under reduced pressure. The residue was diluted with water (20 mL) and extracted with CH2Cl2 (2×30 mL). The combined organic extracts were washed with water (15 mL), dried over Na2SO4, filtered and concentrated under reduced pressure to obtain the crude. The crude was triturated with n-pentane (2×5 mL) to afford compound 6 (149 mg, 81%) as an off-white solid. 1H NMR (400 MHz, DMSO-d6): δ 7.59-7.55 (m, 1H), 7.19-7.06 (m, 3H), 6.79-6.75 (m, 1H), 4.93 (s, 2H), 4.32 (q, 2H), 2.40 (s, 3H), 1.31 (t, J=7.2 Hz, 3H); LC-MS: 98.7%; 440.3 (M++1); (column: X Select CSH C-18, 50×3.0 mm, 3.5 μm); RT 2.90 min. 5 mM NH4OAc: ACN; 0.8 mL/min).

1. customafter completion of the reaction
2. customthe volatiles were removed under reduced pressure
3. additionThe residue was diluted with water (20 mL)
4. extractionextracted with CH2Cl2 (2×30 mL)
5. washThe combined organic extracts were washed with water (15 mL)
6. dry with materialdried over Na2SO4
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. customto obtain the crude
10. customThe crude was triturated with n-pentane (2×5 mL)