反应详情

A microwave vial was charged with 2-bromo-4-fluoro-1-methoxybenzene (500 mg, 2.44 mmol), 1-cyclopentenylboronic acid (273 mg, 2.44 mmol), and Pd(dppf)Cl2 (199 mg, 0.24 mmol). The solids were dissolved in acetonitrile (7 mL) and 2 M Na2CO3 (5 mL) and the mixture heated under microwave irradiation for 20 min at 110° C. The reaction was diluted with dichloromethane (50 mL) and the layers separated. The organic layer was washed with brine, dried over Na2SO4, filtered and concentrated. Purification by silica gel chromatography (10-30% ethyl acetate/hexane) provided 2-cyclopentenyl-4-fluoro-1-methoxybenzene (231 mg, 49% yield). 1H NMR (400.0 MHz, DMSO-d6) δ 7.01 (dd, J=3.1, 10.0 Hz, 1H), 6.92-6.82 (m, 1H), 6.54 (dd, J=2.4, 6.5 Hz, 1H), 6.54 (s, 1H), 3.87 (s, 3H), 2.78-2.73 (m, 2H), 2.62-2.57 (m, 2H), 2.03-1.95 (m, 2H).

1. customthe layers separated
2. washThe organic layer was washed with brine
3. dry with materialdried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated
6. customPurification by silica gel chromatography (10-30% ethyl acetate/hexane)