1.1: sodium chlorite; sodium dihydrogen phosphate monohydrate; 2-methyl-but-2-ene / tert-butyl alcohol; tetrahydrofuran; water / 4 h / 20 °C 2.1: diethyl ether; methanol / 0.25 h / 20 °C / |Inert atmosphere 3.1: 1,8-diazabicyclo[5.4.0]undec-7-ene / methanol / 8 h / 20 °C / |Inert atmosphere 4.1: trifluoroacetic acid; dimethylsulfide / dichloromethane / 1 h / 20 °C / |Inert atmosphere 4.2: 0.5 h / 50 °C / |Inert atmosphere 5.1: acetic acid; sodium cyanoborohydride / methanol / 1 h / 20 °C / |Inert atmosphere View Scheme