1: 69 percent / NiCl2*6H2O, NaBH4 / tetrahydrofuran / 1 h / Ambient temperature 2: 1.) 2N NaOH, 2.) 2N HCl / 1.) aq. EtOH, 100 deg C, 16 h 3: SOCl2 / 22 h / Ambient temperature 4: Et3N / toluene / 21 h / 110 °C View Scheme