反应详情

N,N-dimethylaniline (7.12 mL, 56.2 mmol) followed by tert-butyl 4-(chlorocarbonyl)piperidine-1-carboxylate 1-11 (42.1 mL of a 1 M solution in methylene chloride, 42.1 mmol) were added to a neat stirred mixture of 2-bromo-N-isopropyl-4,5-dimethylaniline 1-9 (6.80 g, 28.1 mmol) and N,N-dimethylamino-pyridine (172 mg, 1.40 mmol) at approximately 0° C. The resulting mixture was heated to reflux for 30 min, cooled to ambient temperature and partitioned between diethyl ether and aqueous 1 N hydrochloric acid. The organic phase was separated and washed successively with aqueous 1 N hydrochloric acid, saturated aqueous sodium bicarbonate, brine, dried (sodium sulfate) and concentrated in vacuo to give a crude residue. Purification of the crude residue by flash chromatography over silica gel (gradient elution; 0%-40% ethyl acetate/hexanes as eluent) afforded 1-12 as a white solid.

1. temperatureThe resulting mixture was heated
2. temperatureto reflux for 30 min
3. custompartitioned between diethyl ether and aqueous 1 N hydrochloric acid
4. customThe organic phase was separated
5. washwashed successively with aqueous 1 N hydrochloric acid, saturated aqueous sodium bicarbonate, brine
6. dry with materialdried (sodium sulfate)
7. concentrationconcentrated in vacuo
8. customto give a crude residue
9. customPurification of the crude residue by flash chromatography over silica gel (gradient elution; 0%-40% ethyl acetate/hexanes as eluent)