反应详情

To a solution of the title compound from Step 2 (1.0 g, 3.3 mmol) in 20 mL of dry DCM was added a solution of pyridine (793 mg, 10 mmol) in DCM (10 mL), followed by addition of EtSO2Cl (473 mg, 3.7 mmol). The reaction mixture was stirred at room temperature for 1 h. It was diluted with DCM (20 mL) and washed with water (20 mL×2) and brine. The organic layer was dried over Na2SO4, filtered and concentrated under reduced pressure to give the crude title compound (1.3 g, 100% yield) that was used directly in the next step. 1H NMR (CDCl3, 400 MHz): δ 7.42 (d, J=2.0 Hz, 1H), 7.38 (d, J=2.0 Hz, 1H), 6.88 (br, 1H), 6.40 (s, 1H), 3.09 (q, J=7.2 Hz, 2H), 1.37 (t, J=7.2 Hz, 3H), 2.04-2.08 (m, 1H), 1.06-0.97 (m, 4H). LCMS: 409 (M+18)+.

1. washwashed with water (20 mL×2) and brine
2. dry with materialThe organic layer was dried over Na2SO4
3. filtrationfiltered
4. concentrationconcentrated under reduced pressure