反应详情

1 g of compound 12a (2.7 mmol) and 50 mL of tetrahydrofuran or dioxane were added into a 150 mL two-neck flask and refluxed under nitrogen atmosphere. 2 M of borane-dimethyl sulfide solution (10.8 mmol) was slowly added dropwise and refluxed for 2 hours. The reaction mixture was quenched with methanol and purified by column chromatography with dichloromethane to give white solid 13a (930 mg, 96.7%). m.p. 205° C. (decomposition). 1H NMR (300 MHz, DMSO-d6): δ 7.92 (d, J=8.5 Hz, 2H), 7.86 (s, 1H), 7.05 (s, 1H), 6.60 (d, J=8.5 Hz, 2H), 5.48 (br s, 2H), 4.02 (t, J=4.5 Hz, 4H), 3.92 (s, 2H), 3.77 (t, J=4.5 Hz, 4H), 2.42 (s, 6H). MS (EI) m/e (%): 352 (M+, 24).

1. temperaturerefluxed under nitrogen atmosphere
2. temperaturerefluxed for 2 hours
3. customThe reaction mixture was quenched with methanol
4. custompurified by column chromatography with dichloromethane