反应详情

tert-Butyl (3-bromo-2-chloro-5-(difluoromethyl)phenyl)carbamate (1.82 g, 5.10 mmol) was dissolved in DMF (11.1 mL) at room temperature. NaHMDS (6.12 mL, 6.12 mmol) was added dropwise and the reaction was stirred for 30 minutes before the addition of 4-methoxybenzyl chloride (0.904 mL, 6.64 mmol) and stirring overnight. The reaction mixture was diluted with EtOAc causing a ppt to form. 10% aq. LiCl solution was added and the two layers became clear with stirring. The mixture was poured into a separatory funnel and the organic layer was washed with an extra equivalent of 10% aq. LiCl solution. The organic layer was dried over Na2SO4 and concentrated. Column chromatography (220 g SiO2, 0 to 8% EtOAc-hexane, gradient elution) afforded the expected product tert-butyl (3-bromo-2-chloro-5-(difluoromethyl)phenyl)(4-methoxybenzyl)carbamate (2.29 g).

1. customto form
2. stirringwith stirring
3. additionThe mixture was poured into a separatory funnel
4. washthe organic layer was washed with an extra equivalent of 10% aq. LiCl solution
5. dry with materialThe organic layer was dried over Na2SO4
6. concentrationconcentrated
7. washColumn chromatography (220 g SiO2, 0 to 8% EtOAc-hexane, gradient elution)