反应详情

To a solution of 4-nitrophenylchloroformate (7.04 g, 34.9 mmol) in THF (100 mL) was added a solution of 2,3-difluorobenzylamine (4.26 mL, 36.4 mmol) and DIEA (13.2 mL, 75.9 mmol) in THF (20 mL). The resulting solution was stirred at RT for 20 min. The reaction solution was added into a solution of (S)-1-(tert-butyldimethylsilyloxy)-N-methylpent-4-en-2-amine (31.9 mmol) in THF (50 mL). The resulting solution was stirred at RT overnight. The solvent was removed and the resulting residue was re-dissolved in EtOAc (500 mL). The organic mixture was washed with NaOH (1 N, 100 mL×3), HCl (0.5 N, 100 mL), saturated NaHCO3, and brine, dried over Na2SO4, filtered, and concentrated under reduced pressure. The residue was purified on silica gel column using a mixture of DCM and MeOH to give (S)-1-(1-(tert-butyldimethylsilyloxy)pent-4-en-2-yl)-3-(2,3-difluorobenzyl)-1-methylurea (6.8 g, 49%) as a white solid. LRMS (M+H+) m/z 399.2.

1. stirringThe resulting solution was stirred at RT overnight
2. customThe solvent was removed
3. dissolutionthe resulting residue was re-dissolved in EtOAc (500 mL)
4. washThe organic mixture was washed with NaOH (1 N, 100 mL×3), HCl (0.5 N, 100 mL), saturated NaHCO3, and brine
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customThe residue was purified on silica gel column
9. additiona mixture of DCM and MeOH