反应详情

To a mixture of 2,6-dichloronicotinamide (1 g, 5.24 mmol) and N1,N1-diethylbenzene-1,4-diamine (2.150 g, 13.09 mmol) in THF (50 mL) was added lithium bis(trimethylsilyl)amide (26.2 mL, 26.2 mmol) drop-wise at first then portion-wise at −78° C. The reaction mixture was stirred at rt for 30 min. The ice bath was removed and the reaction mixture was stirred at rt overnight. The reaction mixture was diluted with water, extracted twice with ethyl acetate, and the combined organic layers were washed with water and concentrated. The residue was purified by MPLC (ISCO, hexane/ethyl acetate, 120 g silica gel column) to give 6-chloro-2-(4-(diethylamino)phenylamino)nicotinamide. LCMS: (M+H)+=319.10. 1H NMR (400 MHz, CDCl3) δ ppm 10.44 (1H, s), 7.56 (1H, d, J=7.91 Hz), 7.47 (2H, d, J=9.23 Hz), 6.69 (2H, d, J=9.23 Hz), 6.55 (1H, d, J=7.91 Hz), 5.73 (2H, br. s.), 3.33 (4H, q, J=7.03 Hz), 1.15 (6H, t, J=7.03 Hz).

1. customThe ice bath was removed
2. stirringthe reaction mixture was stirred at rt overnight
3. additionThe reaction mixture was diluted with water
4. extractionextracted twice with ethyl acetate
5. washthe combined organic layers were washed with water
6. concentrationconcentrated
7. customThe residue was purified by MPLC (ISCO, hexane/ethyl acetate, 120 g silica gel column)