1: 3-(4-(trifluoromethyl)phenyl)prop-2-yn-1-ol With sodium hydride in tetrahydrofuran T=0 - 20°C; 2: allyl bromide in tetrahydrofuran T=0 - 20°C;

1.1: 75 percent / Pd(PPh3)2Cl2; CuI; piperidine / toluene / 3 h / 30 - 35 °C 2.1: NaH / tetrahydrofuran / 0 - 20 °C 2.2: 91 percent / tetrahydrofuran / 0 - 20 °C View Scheme