1: 1,3-dimethyl-imidazolidin-2-one; lithium hydroxide hydrate / tetrahydrofuran / 14 h / 25 - 50 °C / |Inert atmosphere 2: potassium carbonate; dihydrogen peroxide / water; methanol; dimethyl sulfoxide / 1.5 h / 50 - 70 °C 3: acetic acid; methanesulfonic acid / 13 h / 40 - 105 °C View Scheme