boron trifluoride diethyl etherate T=-5 - 20°C; 2 h;

trimethylsilylazide; zinc(II) chloride in dichloromethane 1.) r.t., 1 h; 2.) 40 deg C, 5 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

trimethylsilyl bromide in chloroform-d1 0.05 h;

tetrahydrofuran; perchloric acid T=20°C; 4 h;