反应详情

A flask was charged with 3-{5-amino-6-[(methylamino)carbonyl]pyrazin-2-yl}benzoic acid (48.9 mg, 0.18 mmol), 1-hydroxybenzotriazole (HOBT, 39.7 mg, 0.294 mmol), 2.00 mL of tetrahydrofuran, 4-chlorobenzylamine (28.2 mg, 0.2 mmol) and 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride (66.2 mg, 0.353 mmol). The reaction was stirred at room temperature for 2 h. The reaction was diluted with ethyl acetate, washed sequentially saturated aqueous NaCl, saturated aqueous sodium carbonate, 1.0 M aqueous hydrochloric acid, and saturated aqueous sodium bicarbonate The organic layer was dried over sodium sulfate, filtered, and concentrated on a rotary evaporator under reduced pressure. The crude product was purified by chromatography on silica gel using EtOAc as the eluent. After concentration, the product was triturated in 5% ethyl acetate in hexanes. The solid product was filtered, and after drying afforded 3-amino-6-[3-({[(4-chlorophenyl)methyl]amino}carbonyl)phenyl]-N-methylpyrazine-2-carboxamide (39.8 mg, 50% yield). 1H NMR (400 MHz; DMSO-d6): 9.15 (m, 1H); 8.87 (s, 1H); 8.80 (m, 1H); 8.50 (s, 1H); 8.35 (d, 1H); 7.85 (d, 1H); 7.53 (d, 1H); 7.37 (m, 2H); 4.51 (d, 2H); 2.83 (s, 3H): MS (EI) for C20H18N5O2Cl: 396 (MH+).

1. washwashed sequentially saturated aqueous NaCl, saturated aqueous sodium carbonate, 1.0 M aqueous hydrochloric acid, and saturated aqueous sodium bicarbonate The organic layer
2. dry with materialwas dried over sodium sulfate
3. filtrationfiltered
4. concentrationconcentrated on a rotary evaporator under reduced pressure
5. customThe crude product was purified by chromatography on silica gel
6. concentrationAfter concentration
7. customthe product was triturated in 5% ethyl acetate in hexanes
8. filtrationThe solid product was filtered
9. customafter drying