1.1: i-PrMgCl*LiCl / tetrahydrofuran / 1 h / -40 °C 1.2: ZnBr2 / tetrahydrofuran / 1 h / -40 - -5 °C 1.3: 75 percent / Pd(PPh3)4 / tetrahydrofuran / 4 h / Heating 2.1: 78 percent / sodium azide; boron trifluoride diethyl etherate; trifluoroacetic acid / CH2Cl2 / 0.25 h / 20 °C 3.1: 57 percent / 1,3,5-trimethyl-benzene / 6 h / Heating View Scheme

1.1: i-PrMgCl*LiCl / tetrahydrofuran / 1 h / -40 °C 1.2: ZnBr2 / tetrahydrofuran / 1 h / -40 - -5 °C 1.3: 78 percent / Pd(PPh3)4 / tetrahydrofuran / Heating 2.1: 95 percent / potassium hydrogen sulfate; sodium azide / CH2Cl2; H2O / 12 h / 20 °C View Scheme

1.1: i-PrMgCl*LiCl / tetrahydrofuran / 1 h / -40 °C 1.2: ZnBr2 / tetrahydrofuran / 1 h / -40 - -5 °C 1.3: 78 percent / Pd(PPh3)4 / tetrahydrofuran / Heating 2.1: 95 percent / potassium hydrogen sulfate; sodium azide / CH2Cl2; H2O / 12 h / 20 °C 3.1: 63 percent / 1,3,5-trimethyl-benzene / 5 h / Heating View Scheme

sodium azide; boron trifluoride diethyl etherate; trifluoroacetic acid in dichloromethane T=20°C; 0.25 h;