Cu(ClO4)2*6H2O; trimethylsilylazide; 2,3-dicyano-5,6-dichloro-p-benzoquinone in 1,2-dichloro-ethane T=60°C; 2 h;

Multi-step reaction with 2 steps 1: 92 percent / K2CO3 / toluene; dimethylformamide / 24 h / Ambient temperature2: 85 percent / lithium aluminum hydride / tetrahydrofuran / 0.5 h