反应条件
1: 35percent HBr / acetic acid 2: TDA-1, aq. K2CO3 / CH2Cl2 / 15 h / 40 °C 3: TDA-1, aq. K2CO3 / CH2Cl2 / 24 h / Heating 4: 1.) Br2, 2.) aq. AcOH / 1.) CCl4, 20 deg C, 1 h, 2.) r.t., 10 h 5: 95 percent / NaBH4 / tetrahydrofuran; methanol / 1.5 h / 20 °C 6: 100 percent / NaOMe / methanol / 3 h View Scheme
