1.1: 2,6-dimethylpyridine; trimethylsilyl trifluoromethanesulfonate / dichloromethane / 1 h / -20 °C 1.2: -20 - 20 °C 2.1: sodium chlorite; sodium dihydrogenorthophosphate / 2-methyl-but-2-ene; water; tert-butyl alcohol / 0 - 20 °C 3.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 0 - 20 °C View Scheme