1: 17 percent / K2CO3 / dimethylformamide / 24 h / 100 °C 2: 1.) n-BuLi / 1.) THF, -70 deg C, 1 h, 2.) 1 h, -60 deg C View Scheme

n-butyllithium 1.) THF, -70 deg C, 1 h, 2.) 1 h, -60 deg C; Yield given. Multistep reaction;