反应详情

To a stirred solution of 22 (500 mg, 2.15 mmol) in anhydrous DCM (20 mL) at 0° C. under nitrogen was added 4-(2-aminoethyl)-morpholine (307 mg, 2.36 mmol). The reaction mixture was allowed to warm to the room temperature over 3 hours and was stirred for additional 14 hours, treated with saturated aqueous solution of NHCO3 and extracted with DCM. The organic layer was dried over Na2SO4, filtered, and concentrated. The residues was purified by flash chromatography on silica gel (eluents MeOH— DCM, 5:95, then 1:9) to afford the title compound 23 (458 mg, 65% yield) as a white solid. 1H NMR (400 MHz, CDCl3) δ(ppm): 9.13 (t, J=5.6 Hz, 1H), 9.08 (s, 1H), 8.32 (s, 1H), 3.60-3.54 (m, 4H), 3.44 (q, J=6.8 Hz, 2H), 2.54-2.48 (m, 2H), 2.46-2.40 (m, 4H).

1. extractionextracted with DCM
2. dry with materialThe organic layer was dried over Na2SO4
3. filtrationfiltered
4. concentrationconcentrated
5. customThe residues was purified by flash chromatography on silica gel (eluents MeOH— DCM, 5:95