1: water / tetrahydrofuran; water / 0.5 h / |Inert atmosphere 2: tetrakis(triphenylphosphine) palladium(0); potassium carbonate / 1,4-dioxane / 48 h / |Inert atmosphere; |Reflux View Scheme

water in tetrahydrofuran; water 0.5 h; Inert atmosphere;

1.1: KHF2 / diethyl ether; H2O; hexane / 20 °C 2.1: HBF4; NaNO2 / H2O / 0.5 h / 0 - 5 °C 2.2: 93 percent / Pd(OAc)2 / dioxane / 2 h / 20 °C View Scheme

1.1: water / tetrahydrofuran; water / 0.5 h / |Inert atmosphere 2.1: tetrakis(triphenylphosphine) palladium(0); potassium carbonate / 1,4-dioxane / 48 h / |Inert atmosphere; |Reflux 3.1: boron tribromide / dichloromethane / -78 °C 3.2: 0.5 h View Scheme