Fig. 3.

Mechanistic studies on the γ-azidation of 2-alkyl benzohydrazides. a Control experiment; b radical clock experiment; c KIE experiment; d possible reaction pathway; conditions: 6, 7 or 3a/3a-D2 (0.1 mmol), TMSN₃ (0.2 mmol), Cu(MeCN)₄PF₆ (0.04 mmol), MeCO₂OtBu (0.2 mmol), tBuOH (2.0 mL, c 0.05 M), 50 °C, 2 h