反应详情

Compound 403 (1.5 g, 9.8 mmol) was dissolved in 2-butanone (40 mL). Potassium carbonate (3.4 g, 24.5 mmol) was added and the solution heated at reflux. After 5 min, 1-bromopropane (18 μL, 5 mmol, 2 mL) was added drop-wise and the reaction mixture continued to stir for 18 h. The solvent was evaporated in vacuo and the crude residue was partitioned between EtOAc (150 mL) and saturated NaHCO3 (150 mL). The organic layer was separated, washed with brine (100 mL) and dried over Na2SO4. The resulting oil was purified by column chromatography (0% to 20% EtOAc/hexanes) to yield a yellow oil (1.89 g, 99%): TLC Rf 0.70 (20% EtOAc/hexanes). 1H NMR (600 MHz, CDCl3) δ 8.09-8.07 (d, 1H, J=8.76 Hz), 6.79-6.77 (m, 2H), 3.99-3.97 (t, 2H, J=6.54 Hz), 2.63 (s, 3H), 1.85-1.82 (sex, 2H, J=7.44 Hz), 1.06-1.04 (t, 3H, J=7.44 Hz). 13C NMR (150 MHz, CDCl3) δ 162.9, 142.2, 137.3, 127.8, 118.1, 112.4, 70.3, 22.60, 21.98, 10.6. Elemental analysis calculated for C10H13NO3.0.03 hexanes: C, 61.81; H, 6.84; N, 7.08. Found: C, 62.20; H, 6.78; N, 7.23.

1. temperaturethe solution heated
2. temperatureat reflux
3. customThe solvent was evaporated in vacuo
4. customthe crude residue was partitioned between EtOAc (150 mL) and saturated NaHCO3 (150 mL)
5. customThe organic layer was separated
6. washwashed with brine (100 mL)
7. dry with materialdried over Na2SO4
8. customThe resulting oil was purified by column chromatography (0% to 20% EtOAc/hexanes)