1: N-chloro-succinimide; palladium diacetate; sodium peroxodisulphate; trifluorormethanesulfonic acid / 1,2-dichloro-ethane / 6 h / 60 °C / |Sealed tube 2: potassium hydroxide / methanol / 12 h / |Sealed tube; |Reflux 3: silver carbonate / dimethyl sulfoxide / 16 h / 120 °C / |Sealed tube View Scheme

1: N-chloro-succinimide; palladium diacetate; sodium peroxodisulphate; trifluorormethanesulfonic acid / 1,2-dichloro-ethane / 6 h / 60 °C / |Sealed tube 2: potassium hydroxide / methanol / 12 h / |Sealed tube; |Reflux View Scheme