反应详情

温度

100 °C

To a stirred solution of 2,3-dimethyl-2H-indazol-6-ylamine (60 mg, 0.34 mmol) in DCE (1.5 mL) at 0° C., under nitrogen, was added trimethylaluminium (2M in toluene, 0.35 mL, 0.7 mmol), followed by a solution of 2-{[2-(3,3-dimethyl-ureido)-pyridin-4-ylmethyl]-amino}-benzoic acid methyl ester (111 mg, 0.34 mmol) in DCE (1.5 mL). The reaction was heated at 100° C. (bath temperature) for 5 hours. On cooling the reaction was poured onto saturated aqueous sodium hydrogencarbonate solution and diluted with dichloromethane. The mixture was stirred for 15 minutes before filtering through Celite®. The organic phase was washed with water and brine, dried, and concentrated in vacuo. The residue was purified by repeated chromatography on Isolute® flash silica gel (Separtis) (Gradient elution: 100% CH2Cl2 to CH2Cl2/EtOH 95:5) to give N-(2,3-dimethyl-2H-indazol-6-yl)-2-{[2-(3,3-dimethyl-ureido)-pyridin-4-ylmethyl]-amino}-benzamide (23 mg, 15%) as a solid; 1H-NMR (300 MHz, d6-DMSO) 10.10 (1H, s), 8.79 (1H, s), 8.15 (1H, d), 8.00 (1H, s), 7.95 (1H, t), 7.82 (1H, s), 7.70-7.73 (1H, m), 7.60 (1H, d), 7.22-7.29 (2H, m), 6.93-6.95 (1H, m), 6.67 (1H, t), 6.53 (1H, d), 4.45 (2H, d), 4.01 (3H, s), 2.91 (6H, s), 2.59 (3H, s); m/z (ES+) 458 [M+H]+, 230.

1. temperatureOn cooling the reaction
2. filtrationbefore filtering through Celite®
3. washThe organic phase was washed with water and brine
4. customdried
5. concentrationconcentrated in vacuo
6. customThe residue was purified