sodium azide in N,N-dimethyl-formamide T=90°C; 5 h;

1: 3-Bromobenzenemethanol With n-butyllithium in tetrahydrofuran; hexane T=0°C; 0.25 h; 2: p-toluenesulfonyl chloride in tetrahydrofuran; hexane T=70°C; 15 h;