1: 82.5 percent / dimethylsulfoxide / 0.5 h / 140 °C 2: 99.4 percent / H2 / 5percent Pd/C / tetrahydrofuran / 0.25 h / Ambient temperature 3: 60 percent / phosphorus oxychloride, Et3N, pyridine / CHCl3 / Ambient temperature 4: 61.8 percent / K2CO3 / methanol / 3 h / Ambient temperature View Scheme

1: 82.5 percent / dimethylsulfoxide / 0.5 h / 140 °C 2: 99.4 percent / H2 / 5percent Pd/C / tetrahydrofuran / 0.25 h / Ambient temperature 3: 60 percent / phosphorus oxychloride, Et3N, pyridine / CHCl3 / Ambient temperature View Scheme