1: 84 percent / K2CO3 / CHCl3; H2O / 0 °C 2: 1.) sodium hydride / 1.) dimethylformamide, room temperature, 2 h, 2.) 0 deg C, 1 h, 0 deg C -> room temperature, 16 h View Scheme

sodium hydride 1.) dimethylformamide, room temperature, 2 h, 2.) 0 deg C, 1 h, 0 deg C -> room temperature, 16 h; Yield given. Multistep reaction;