1: Zn, AcOH / H2O / 70 °C 2: Na2CO3 / tetrahydrofuran / 0 °C 3: 87 percent / Ba(OH)2 / dioxane; H2O / Heating 4: SOCl2 / diethyl ether 6: 76 percent / NaBH4 / dimethylformamide / 80 °C 7: 85 percent / aq. HBr View Scheme