caesium carbonate in acetonitrile T=20°C; 72 h;

1: 71 percent / BH3*HNMe2 / methanol / 3 h / 20 °C 2: 90 percent / 1.5 h / 170 °C / microwave irradiation 3: 100 percent / DIBALH / tetrahydrofuran; CH2Cl2 / 4 h / -78 °C 4: 89 percent / I2; PPh3; imidazole / CH2Cl2 / 0 - 20 °C 5: 47 percent / cesium carbonate / acetonitrile / 72 h / 20 °C View Scheme

1: 90 percent / 1.5 h / 170 °C / microwave irradiation 2: 100 percent / DIBALH / tetrahydrofuran; CH2Cl2 / 4 h / -78 °C 3: 89 percent / I2; PPh3; imidazole / CH2Cl2 / 0 - 20 °C 4: 47 percent / cesium carbonate / acetonitrile / 72 h / 20 °C View Scheme

1: 100 percent / DIBALH / tetrahydrofuran; CH2Cl2 / 4 h / -78 °C 2: 89 percent / I2; PPh3; imidazole / CH2Cl2 / 0 - 20 °C 3: 47 percent / cesium carbonate / acetonitrile / 72 h / 20 °C View Scheme

1: 89 percent / I2; PPh3; imidazole / CH2Cl2 / 0 - 20 °C 2: 47 percent / cesium carbonate / acetonitrile / 72 h / 20 °C View Scheme

water in tetrahydrofuran T=165°C; 4 h; microwave irradiation;