triethylamine in tetrahydrofuran 24 h; Heating;

sodium azide in ethylene glycol dimethyl ether T=75°C; 20 h;

triethylamine in diethyl ether T=0 - 20°C; 4.66667 h; Inert atmosphere;

1: phenyl-carbamic acid tert-butyl ester With n-butyllithium in tetrahydrofuran T=-78 - 20°C; Metallation; 2 h; 2: With magnesium bromide in tetrahydrofuran T=-78°C; transmetallation; 1 h; 3: allyl bromide in tetrahydrofuran T=-78°C; allylation; 1 h;

1: 2-(prop-2-en-1-yl)benzoic acid With diphenyl-phosphinic acid; triethylamine in benzene T=20°C; 2: tert-butyl alcohol in benzene Heating; Further stages.;

1: boron trifluoride diethyl etherate / toluene / Reflux 2: triethylamine / tetrahydrofuran / 14 h / 20 °C View Scheme

1.1: tetrahydrofuran / 0.25 h / -40 °C / |Inert atmosphere 1.2: 0.25 h / -40 °C / |Inert atmosphere 1.3: 2 h / -40 °C / |Inert atmosphere 2.1: zinc; acetic acid / ethanol / 1.5 h / 20 °C / |Inert atmosphere 3.1: triethylamine / diethyl ether / 20 h / 0 - 20 °C / |Inert atmosphere View Scheme

1: zinc; acetic acid / ethanol / 1.5 h / 20 °C / |Inert atmosphere 2: triethylamine / diethyl ether / 20 h / 0 - 20 °C / |Inert atmosphere View Scheme