反应详情

To a solution of 1,3-difluoro-4-nitro-2-vinylbenzene (150 mg, 0.81 mmol) in DMF (3 mL) was added a mixture of 1-methylallylamine in ethanol (0.4 mL). Potassium carbonate (0.224 g, 1.62 mmol) was added and the mixture stirred at RT for 1 h. A further portion of 1-methylallylamine in ethanol (0.3 mL) was added and stirring was continued for 1 h, and then the reaction mixture was partitioned between water and EtOAc. The aqueous phase was extracted with EtOAc and the combined organic layers were washed with water, followed by brine, then dried (Na2SO4) and concentrated in vacuo. The resulting residue was purified by column chromatography (Si—PCC, eluant 2-6% EtOAc in cyclohexane) affording the title compound as a yellow oil (134 mg, 70%). 1H NMR (CDCl3, 300 MHz): 8.06 (1H, dd J=9.4, 5.7 Hz), 7.23 (1H, bs), 6.62 (1H, t, J=9.3 Hz), 6.48 (1H, dd, J=18.0, 11.6 Hz), 5.81-5.62 (2H, m), 5.64 (1H, dt, J=11.6, 1.3 Hz), 5.12-5.00 (2H, m), 4.38-4.25 (1H, m), 1.27 (3H, d, J=6.6 Hz)

1. stirringstirring
2. waitwas continued for 1 h
3. customthe reaction mixture was partitioned between water and EtOAc
4. extractionThe aqueous phase was extracted with EtOAc
5. washthe combined organic layers were washed with water
6. dry with materialdried (Na2SO4)
7. concentrationconcentrated in vacuo
8. customThe resulting residue was purified by column chromatography (Si—PCC, eluant 2-6% EtOAc in cyclohexane)