potassium hydroxide; nickel copper formate; ((n-Bu)4N)2S2O8 in dichloromethane T=20°C; Oxidation; 10 h;

1: 90 percent / sodium hydrogencarbonate, sodium iodide / tetrahydrofuran; dimethylsulfoxide / Heating 2: 79 percent / 2-mercaptobenzoic acid, Pd(dba)2, DPPB / tetrahydrofuran / 1 h / 20 °C View Scheme

With  sodium azide; triphenylphosphine in  dichloromethane; N,N-dimethyl-formamide T=90°C; Substitution; Mitsunobu reaction; Staudinger reaction; 4 h;   

With  hydrazine hydrate in  ethanol T=75°C; 6.5 h;