1: dichloromethane / 20 °C / |Molecular sieve; |Inert atmosphere 2: 2,6-dimethylpyridine; copper(II) bis(trifluoromethanesulfonate) / dichloromethane / 12 h / 20 °C / |Inert atmosphere View Scheme

in acetonitrile 2.5 h; Irradiation;