1: potassium hydroxide / water; ethanol 2: 4-(N,N-dimethlyamino)pyridine; dicyclohexyl-carbodiimide / dichloromethane / 48 h / 25 °C / |Inert atmosphere 3: recorcinol; sodium chlorite; sodium dihydrogen phosphate dihydrate / water; tert-butyl alcohol / 48.5 h / 30 °C / |Inert atmosphere View Scheme