Multi-step reaction with 3 steps 1.1: 86 percent / thionyl chloride / benzene / 18 h / Heating2.1: 98 percent / NaN3 / diethyl ether; H2O / 0 - 20 °C3.1: CuCN / tetrahydrofuran / 0.67 h / -78 °C3.2: benzene; toluene / 2 h / Heating3.3: 60 percent / tetrahydrofuran; benzene; toluene / 0 - 20 °C