反应详情

To a stirred solution of 1-isopropyl-1,3-dihydro-2H-benzimidazol-2one (J. Med. Chem. 1999, 42, 2870-2880) (3.00 g, 17.02 mmol) and triethylamine (7.12 ml, 51.06 mmol) in 70 ml tetrahydrofuran was added triphosgene (5.15 g, 17.02 mmol) in 14 ml tetrahydrofuran at room temperature. The reaction mixture was refluxed for 19 hours. The mixture was then cooled to room temperature, tert-butyl 4-(aminomethyl)piperidine-1-carboxylate (J. Prugh, L. A. Birchenough and M. S. Egbertson, Synth. Commun., 1992, 22, 2357-60) (3.28 g, 15.32 mmol) in 10 ml tetrahydrofuran was added. The reaction mixture was refluxed for another 24 hours. Then cooled and basified with aqueous saturated NaHCO3 50 ml, and extracted with ethyl acetate 100 ml for three times. The combined extract was washed with brine, dried over MgSO4 and concentrated. Flash chromatography of the residue (elutent: hexane/ethyl acetate=5/1 to 1/2) afforded a colorless oil 3.99 g (62%) as the titled compound.

1. temperatureThe reaction mixture was refluxed for 19 hours
2. temperatureThe reaction mixture was refluxed for another 24 hours
3. temperatureThen cooled
4. extractionextracted with ethyl acetate 100 ml for three times
5. extractionThe combined extract
6. washwas washed with brine
7. dry with materialdried over MgSO4
8. concentrationconcentrated