1: 1.) 9-borabicyclo<3.3.1>nonane 2.) 30percent H2O2, 6N NaOH / 1.) THF, RT, 20 h 2.) ethanol, RT, 30 min 2: Ba(OH)2 / ethanol; H2O / 30 h / 80 °C 3: triethylamine / tetrahydrofuran / 20 h / Ambient temperature 4: 55 percent / O2 / PtO2 / dioxane; H2O / 30 h / 55 °C View Scheme

Multi-step reaction with 3 steps 1: 1.) 9-borabicyclo<3.3.1>nonane 2.) 30percent H2O2, 6N NaOH / 1.) THF, RT, 20 h 2.) ethanol, RT, 30 min2: Ba(OH)2 / ethanol; H2O / 30 h / 80 °C3: triethylamine / tetrahydrofuran / 20 h / Ambient temperature