0.5 h; Heating;

1: 1.) tetramethylethylenediamine, sec-BuLi, 2.) tosyl azide, 3.) tetra-n-butylammonium hydrogen sulfate, sodium borohydride 2: 88 percent / hydrazine / 1 h / Heating 3: 62 percent / 0.5 h / Heating View Scheme

1: 88 percent / hydrazine / 1 h / Heating 2: 62 percent / 0.5 h / Heating View Scheme