1.1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 0.17 h / 0 °C / Inert atmosphere 1.2: 0.5 h / Inert atmosphere 2.1: tris-(dibenzylideneacetone)dipalladium(0); caesium carbonate; 9,9-dimethyl-4,5-bis(diphenyl-phosphino)xanthene / toluene / 0.08 h / 20 °C / Inert atmosphere 2.2: 16 h / 110 °C / Inert atmosphere 3.1: potassium tert-butylate / dimethyl sulfoxide / 0.17 h / 20 °C / Inert atmosphere View Scheme

With  N-iodo-succinimide in  nitromethane T=20°C; 12 h;  Inert atmosphere;