反应详情

6-Bromo-3,3-dimethyl-2,3-dihydro-pyrrolo[3,2-b]pyridine-1-carboxylic acid tert-butyl ester (1.33 g, 4.07 mmol) in THF (20.3 mL) was cooled to −78° C. under nitrogen and butyllithium (2.5 M in hexanes, 3.75 mL, 9.4 mmol) added. The reaction was stirred at this temperature for 30 minutes. To this was added N-methoxy-N-methyl-propionamide (0.71 g, 6.1 mmol) and the reaction was stirred for 1 h. Water and EtOAc were added and the organic layer separated, washed with brine (3×) and dried with sodium sulfate, filtered and concentrated. Chromatography (silica gel, gradient elution, 0-60%, EtOAc in petrol 40-60) gave the title compound (0.823 g), MS: [M+H]+=305, as a 2:1 mixture with 3,3-dimethyl-2,3-dihydro-pyrrolo[3,2-b]pyridine-1-carboxylic acid tert-butyl ester.

1. stirringthe reaction was stirred for 1 h
2. customthe organic layer separated
3. washwashed with brine (3×)
4. dry with materialdried with sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated
7. washChromatography (silica gel, gradient elution, 0-60%, EtOAc in petrol 40-60)