potassium carbonate in N,N-dimethyl-formamide T=25°C; 14 h;

sodium chlorite; sodium dihydrogenphosphate; 2-methyl-but-2-ene in tert-butyl alcohol T=25°C; 2 h;

1.1: 97 percent / aq. NaClO2; NaH2PO4; 2-methyl-2-butene / 2-methyl-propan-2-ol / 12 h / 25 °C 2.1: diphenylphosphoryl azide; Et3N / tetrahydrofuran / 3 h / 25 °C 2.2: 78 percent / H2O / tetrahydrofuran / 2 h / Heating View Scheme