1: phenyl-carbamic acid tert-butyl ester With n-butyllithium in diethyl ether; pentane T=-40 - 0°C; 3.5 h; Inert atmosphere; 2: tributyltin chloride in diethyl ether; pentane T=-78 - 0°C; 6 h; Inert atmosphere;

1.1: 2,6-dimethylpyridine; trimethylsilyl trifluoromethanesulfonate / dichloromethane / 1 h / 20 °C / |Inert atmosphere 1.2: 0.5 h / 20 °C / |Inert atmosphere 2.1: tetrakis(triphenylphosphine) palladium(0); cesium fluoride; copper(l) iodide / N,N-dimethyl-formamide / 16 h / 20 °C / |Inert atmosphere View Scheme

1.1: 2,6-dimethylpyridine; trimethylsilyl trifluoromethanesulfonate / dichloromethane / 1 h / 20 °C / |Inert atmosphere 1.2: 0.5 h / 20 °C / |Inert atmosphere 2.1: tetrakis(triphenylphosphine) palladium(0); cesium fluoride; copper(l) iodide / N,N-dimethyl-formamide / 16 h / 20 °C / |Inert atmosphere View Scheme

1.1: 2,6-dimethylpyridine; trimethylsilyl trifluoromethanesulfonate / dichloromethane / 1 h / 20 °C / |Inert atmosphere 1.2: 0.5 h / 20 °C / |Inert atmosphere 2.1: tris(dibenzylideneacetone)dipalladium(0) chloroform complex; triphenyl-arsane / N,N-dimethyl-formamide / 16 h / 20 °C / |Inert atmosphere View Scheme

1.1: 2,6-dimethylpyridine; trimethylsilyl trifluoromethanesulfonate / dichloromethane / 1 h / 20 °C / |Inert atmosphere 1.2: 0.5 h / 20 °C / |Inert atmosphere 2.1: tris(dibenzylideneacetone)dipalladium(0) chloroform complex; triphenyl-arsane / N,N-dimethyl-formamide / 16 h / 20 °C / |Inert atmosphere View Scheme