1.1: sodium hydroxide / methanol / 1 h / 20 °C 1.2: pH ~ 5 / Cooling with ice 2.1: caesium carbonate / N,N-dimethyl-formamide / 16 h / 85 °C 3.1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 1 h / 0 °C View Scheme

1.1: sodium hydroxide / methanol / 1 h / 20 °C 1.2: pH ~ 5 / Cooling with ice 2.1: caesium carbonate / N,N-dimethyl-formamide / 16 h / 85 °C 3.1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 1 h / 0 °C 4.1: hydrogen / palladium 10 on activated carbon / methanol / 2 h / 988.07 Torr View Scheme