BaMnO4 in dichloromethane 37 h; Ambient temperature;

Multi-step reaction with 2 steps 1: 83 percent / L-Selectride / tetrahydrofuran / -78 deg C, 2 h, to room temp., 4 h2: 39.1 percent / cuprous bromide, diisopropylamine / dioxane / 21 h / Heating