1.1: N-benzyl-N,N,N-triethylammonium chloride; potassium permanganate / dansyl cadaverine / 2 h / 0 °C 2.1: formic acid; dihydrogen peroxide / dansyl cadaverine / 24 h / 20 - 40 °C 2.2: 1 h / 10 - 20 °C / Industry scale 2.3: pH 2 - 4 3.1: potassium carbonate / N,N-dimethyl-formamide / 65 - 70 °C View Scheme

1.1: N-benzyl-N,N,N-triethylammonium chloride; potassium permanganate / dansyl cadaverine / 2 h / 0 °C 2.1: formic acid; dihydrogen peroxide / dansyl cadaverine / 24 h / 20 - 40 °C 2.2: 1 h / 10 - 20 °C / Industry scale 2.3: pH 2 - 4 View Scheme