1: 28 percent / acetic anhydride, acetic acid, HCl(g) / 2 h / 100 °C 2: 72 percent / ethanol / 2 h / Heating 3: 83 percent / NaBH4 / ethanol / 3 h / Heating 4: lithium diisopropylamide (LDA) / tetrahydrofuran 5: MnO2 / CHCl3 View Scheme

1: 28 percent / acetic anhydride, acetic acid, HCl(g) / 2 h / 100 °C 2: 98 percent / 2 h / 160 - 170 °C 3: 62 percent / NaBH4 / ethanol / 3 h / Heating 4: 62 percent / KNH2, NH3 (liq.) / diethyl ether 5: 37 percent / HCl, CH3COOH / 1 h / Heating View Scheme

1: 30 percent / anhydrous phosphoric acid, acetic anhydride / 0.5 h / 80 °C 2: 84 percent / benzene / 1 h / Heating 3: 58 percent / NaBH4 / dimethylformamide / 1 h / 110 °C 4: 29 percent / NaOH / benzene; H2O; methanol / 2.5 h / Irradiation View Scheme