1: 93 percent / AlCl3 / CH2Cl2 / 6 h / Ambient temperature 2: 73 percent / imidazole / dimethylformamide / 16 h / Ambient temperature 3: 91 percent / K2CO3 / methanol / 2 h / Ambient temperature 4: 34 percent / K2CO3 / dimethylformamide / 24 h / 100 °C 5: 24 percent / AlCl3 / CH2Cl2 / 3 h / Ambient temperature View Scheme