dihydrogen peroxide; acetic acid in methanol; water T=40°C; 24 h;

1.1: trifluoroacetic acid / 20 °C 2.1: 1,1'-carbonyldiimidazole / tetrahydrofuran / 2 h / 20 °C 2.2: 20 °C 3.1: dihydrogen peroxide; acetic acid / methanol; water / 24 h / 40 °C View Scheme

1.1: 1,1'-carbonyldiimidazole / tetrahydrofuran / 2 h / 20 °C 1.2: 20 °C 2.1: dihydrogen peroxide; acetic acid / methanol; water / 24 h / 40 °C View Scheme

1: (Diphenylmethyl)sulfinylacetic acid With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride in N,N-dimethyl-formamide T=20°C; 0.5 h; 2: methylamine in N,N-dimethyl-formamide T=20°C; 1 h;

1.1: sulfuric acid; dihydrogen peroxide / methanol; isopropyl alcohol / 2 h / 20 °C 2.1: sodium hydroxide / ethanol; water / 2 h / 20 °C 3.1: benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride / N,N-dimethyl-formamide / 0.5 h / 20 °C 3.2: 1 h / 20 °C View Scheme

1.1: sodium hydroxide / ethanol; water / 2 h / 20 °C 2.1: benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride / N,N-dimethyl-formamide / 0.5 h / 20 °C 2.2: 1 h / 20 °C View Scheme