反应详情

温度

0 °C

To a stirred solution of acid chloride 5 (115 mg,0.41 mmol) in CH2Cl2 (5 mL) at 0° C. was added 1,2-phenylenediamine (133 mg,1.23 mmol) followed by N-methylmorpholine (49 μL, 0.45 mmol). The mixture was stirred at 0° C. for 1 h, and then was allowed to warm to rt over 1 h. After being stirred for an additional 1 h at rt, the reaction mixture was partitioned between CHCl3 (2×15 mL) and water (15 mL). The combined organic layers were dried (MgSO4) and concentrated under reduced pressure to give the crude product. Purification by flash silica gel chromatography (50% ethyl acetate in hexane) afforded the desired benzamide 18 (21 mg, 15% yield): 1H NMR (300 MHz, CDCl3) δ 6.65-7.40 (m, 9H), 5.96-6.20 (m, 2H), 5.92 (d, J=15.3 Hz, 1H), 4.18 (m, 1H), 3.82 (br s, 2H), 3.81 (s, 3H ), 3.19 (s, 3H), 2.61 (m, 1H), 2.43 (m, 1H); 13CNMR (75.4 MHz,CDCl3) δ 41.7, 55.2, 56.4, 82.7, 113.8, 118.2, 119.5, 121.8, 124.4, 125.0, 127.0, 127.8, 130.1, 133.1, 139.5, 140.7, 142.4, 159.2, 164.6.

1. temperatureto warm to rt over 1 h
2. stirringAfter being stirred for an additional 1 h at rt
3. customthe reaction mixture was partitioned between CHCl3 (2×15 mL) and water (15 mL)
4. dry with materialThe combined organic layers were dried (MgSO4)
5. concentrationconcentrated under reduced pressure
6. customto give the crude product
7. customPurification by flash silica gel chromatography (50% ethyl acetate in hexane)