1.1: 54 percent / phosphorus pentoxide; methanesulfonic acid / 0.67 h / 20 °C 2.1: 81 percent / LDA / tetrahydrofuran / 12 h / 20 °C 3.1: KOH; iodobenzene diacetate / methanol / 24 h / 20 °C 3.2: 65 percent / HCl / ethanol / 2.5 h / 20 °C View Scheme

1.1: 81 percent / LDA / tetrahydrofuran / 12 h / 20 °C 2.1: KOH; iodobenzene diacetate / methanol / 24 h / 20 °C 2.2: 65 percent / HCl / ethanol / 2.5 h / 20 °C View Scheme

1.1: 94 percent / ammonium formate; Pd-C / propan-2-ol / 6 h / 90 °C 2.1: 54 percent / phosphorus pentoxide; methanesulfonic acid / 0.67 h / 20 °C 3.1: 81 percent / LDA / tetrahydrofuran / 12 h / 20 °C 4.1: KOH; iodobenzene diacetate / methanol / 24 h / 20 °C 4.2: 65 percent / HCl / ethanol / 2.5 h / 20 °C View Scheme