1: 96 percent / K2CO3 / acetone / 0.17 h / Heating 2: 51 percent / K2CO3 / dimethylformamide / 0.33 h / Heating 3: 93 percent / LiAlH4 / diethyl ether / 1 h / Ambient temperature 4: 75 percent / BF3-etherate / dioxane / 1 h / Ambient temperature 5: 76 percent / H2 / 10percent Pd-C / methanol / Ambient temperature View Scheme