反应详情

4-Bromo-1-methyl-1H-pyrrole-2-carboxylic acid (122 mg, 0.60 mmol), HATU (274 mg, 0.72 mmol) and DIEA (194 mg, 1.50 mmol) were dissolved in DMF (5 mL). The reaction mixture was stirred at room temperature with ammonia gas bubbled through continuously overnight. The reaction mixture was diluted with 100 mL of DCM, and then washed with water (50 mL). The aqueous layer was extracted with DCM (20 mL×2). All organic layers were combined, dried over sodium sulfate, filtered and concentrated. The residue was purified by silica gel chromatography (petroleum ether/ethyl acetate 6/1) to give 4-bromo-1-methyl-1H-pyrrole-2-carboxylic acid amide (56 mg, yield 46%). 1H NMR (300 MHz, CDCl3): δ 6.74 (d, J=1.8 Hz, 1H), 6.59 (d, J=1.8 Hz, 1H), 3.92 (s, 3H). LC-MS calcd for C6H7BrN2O (m/e) 201.97, obsd 203 and 205 [M+1]+.

1. custombubbled through continuously overnight
2. additionThe reaction mixture was diluted with 100 mL of DCM
3. washwashed with water (50 mL)
4. extractionThe aqueous layer was extracted with DCM (20 mL×2)
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated
8. customThe residue was purified by silica gel chromatography (petroleum ether/ethyl acetate 6/1)