1: With sodium tetrahydroborate; tin(ll) chloride in ethanol T=20°C; 2: With hydrogenchloride in diethyl ether 3: With sodium hydroxide in diethyl ether T=0°C;

1.1: Zn / various solvent(s) / 4 h / 20 °C 1.2: 80.2 percent / Pd(PPh3)4 / 65 °C 2.1: 10.6 g / 27.5 h / 147 °C 3.1: SnCl2*2H2O; NaBH4 / ethanol / 20 °C 3.2: HCl / diethyl ether 3.3: 5.5 g / aq. NaOH / diethyl ether / 0 °C View Scheme

1.1: 10.6 g / 27.5 h / 147 °C 2.1: SnCl2*2H2O; NaBH4 / ethanol / 20 °C 2.2: HCl / diethyl ether 2.3: 5.5 g / aq. NaOH / diethyl ether / 0 °C View Scheme