反应详情

n-Butyl lithium (5.0 mL of a 2.5 M solution in hexanes, 12 mmol) was added dropwise to a solution of 6-bromo-3,3-dimethyl-2,3-dihydro-pyrrolo[3,2-b]pyridine-1-carboxylic acid tert-butyl ester (3.27 g, 10.0 mmol) in diethyl ether (20 mL) at −78° C. The resulting orange slurry was stirred 30 minutes at this temperature, then a solution of N-methoxy-N-methyl-benzamide (2.3 mL, 15.0 mmol) in diethyl ether (10 mL) was added dropwise. The reaction was allowed to warm to room temperature and stirred 1 h further, then quenched with saturated aqueous ammonium chloride and the two layers were separated. The aqueous fraction was further extracted with EtOAc (2×20 mL). The combined organic fractions were dried over MgSO4, filtered and concentrated. The residue was purified by column chromatography (0-30% EtOAc/petrol) to give the title compound (2.4 g, 67%) as a yellow solid. MS: [M+H]+=353.

1. stirringstirred 1 h further
2. customquenched with saturated aqueous ammonium chloride
3. customthe two layers were separated
4. extractionThe aqueous fraction was further extracted with EtOAc (2×20 mL)
5. dry with materialThe combined organic fractions were dried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated
8. customThe residue was purified by column chromatography (0-30% EtOAc/petrol)