1.1: potassium hexamethylsilazane / tetrahydrofuran; toluene / 0.25 h / -78 °C / |Inert atmosphere 1.2: 0.5 h / -78 - 0 °C / |Inert atmosphere 2.1: lithium triethylborohydride / tetrahydrofuran; toluene / 0.5 h / -78 °C / |Inert atmosphere 2.2: 12 h / 20 °C / |Inert atmosphere 3.1: potassium carbonate; palladium diacetate; dibenzyl hydrogen phosphate / 1,1-dimethylpropan-1-ol / 50 h / 110 °C / |Inert atmosphere 4.1: trifluoroacetic acid / tetrahydrofuran; water / 27 h / 0 - 25 °C / |Inert atmosphere View Scheme