1.1: 93 percent / Et3N; CuI / N,N-dimethyl-acetamide / 2 h / 110 °C 2.1: t-BuOK / tetrahydrofuran / 0.33 h / 20 °C 2.2: 100 percent / aq. MeOH / tetrahydrofuran / 0.5 h / 20 °C View Scheme