反应详情

To solution of 2-amino-4-chlorobenzoic acid (4.4 g, 25.8 mmol) in degassed DMF (75 mL) were added successively HOBt (4.19 g, 31 mmol), DIEA (5.4 mL, 31 mmol), EDCI (5.37 g, 28 mmol), and 2N NH3/MeOH (18 mL, 36 mmol), and the solution was stirred at rt for 4 d. The mixture was concentrated under reduced pressure and the residue was partitioned between H2O (200 mL) and DCM (200 mL). The separated aqueous phase was extracted with DCM (2×200 mL) and the combined organic layers were dried over MgSO4, filtered, and concentrated under reduced pressure. The residue was purified by silica gel chromatography eluting with 10-50% EtOAc/hexanes to afford 2-amino-4-chlorobenzamide as a solid (2.91 g, 66%). 1H NMR (300 MHz, DMSO-d6) δ 6.50 (dd, J=8.48, 2.26 Hz, 1H), 6.75 (d, J=2.26 Hz, 1H), 6.84 (br s, 2H), 7.18 (br s, 1H), 7.48-7.63 (m, 1H), 7.80 (br s, 1H).

1. concentrationThe mixture was concentrated under reduced pressure
2. customthe residue was partitioned between H2O (200 mL) and DCM (200 mL)
3. extractionThe separated aqueous phase was extracted with DCM (2×200 mL)
4. dry with materialthe combined organic layers were dried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by silica gel chromatography
8. washeluting with 10-50% EtOAc/hexanes