1: 75 percent / Pd(OAc)2; LiCl; K2CO3 / dimethylformamide / 36 h / 100 °C 2: NaH / dimethylformamide / 1.5 h / 0 °C 3: 1.69 g / aq. HCl / tetrahydrofuran / 0 - 20 °C View Scheme