1.1: 568 mg / RuCl3*3H2O; NaIO4 / acetonitrile; H2O / 0 °C 2.1: LiBr / tetrahydrofuran / 25 °C 2.2: aq. H2SO4 / diethyl ether / 25 °C 2.3: 85 percent / K2CO3 / methanol / 2 h / 0 °C 3.1: 98 percent / H2O / 1 h / Heating View Scheme

in N,N-dimethyl-formamide T=60 - 70°C;