1: 86 percent / AlBr3 / acetonitrile / 0.33 h / 0 - 5 °C 2: 89 percent / K2CO3 / acetone / Heating 3: 89 percent / AlBr3 / acetonitrile / 1 h / Ambient temperature 4: 95 percent / K2CO3 / methanol / 2 h / Heating 5: 89 percent / H2 / 10percent palladium on charcoal / ethyl acetate; methanol View Scheme