1.1: lithium diisopropyl amide / tetrahydrofuran / -78 °C / |Inert atmosphere 1.2: 0.17 h / -78 - 0 °C / |Inert atmosphere 2.1: potassium hydroxide / dimethyl sulfoxide / 0.25 h / 20 °C / |Inert atmosphere 2.2: 20 °C / |Inert atmosphere 3.1: sodium formate; tetrabutyl-ammonium chloride; palladium diacetate / 1-methyl-pyrrolidin-2-one / 27 °C / |Inert atmosphere View Scheme