反应详情

温度

120 °C

5-bromobenzofuran (2 g, 10 mmol), piperidine (1.2 mL, 12 mmol), Pd(dppf)Cl2 (245 mg, 0.3 mmol), dppf(250 mg, 0.45 mmol) and sodium tert-butoxide (1.44 g, 15 mmol) was mixed in toluene (10 mL). The mixture was purged with N2 gas for 3-5 min and heated at 120° C. for 30 min under microwave irradiation (Personal Chemistry Emrys™ Optimizer microwave reactor). Upon completion of the reaction, the reaction mixture was directly loaded on silica gel column and purified on ISCO system (<2% EtOAc in hexanes) to give 0.539 g desired product (27% yield): ESI-MS: 202.3 (M+H)+, 1H NMR (400 MHz, CDCl3) δ 7.58 (s, 1H), 7.40 (d, 1H), 7.15 (s, 1H), 7.00 (d, 1H), 6.65 (s, 1H), 3.10 (m, 4H), 1.70 (m, 4H), 1.48 (m, 2H). Note: the title compound appeared to be very volatile. The evaporation of solvent should be carried out very carefully.

1. customThe mixture was purged with N2 gas for 3-5 min
2. customUpon completion of the reaction
3. custompurified on ISCO system (<2% EtOAc in hexanes)