triethylsilane; trifluoroacetic acid T=70°C; 1 h;

triphenylphosphine in dichloromethane

1: 23 percent / AlCl3 / CH2Cl2 / 6 h / Heating 2: 96 percent / triethylsilane; TFA / 1 h / 70 °C View Scheme

1.1: NaOH / acetone / 20 °C 1.2: 77 percent / SOCl2 / 6 h / Heating 2.1: 23 percent / AlCl3 / CH2Cl2 / 6 h / Heating 3.1: 96 percent / triethylsilane; TFA / 1 h / 70 °C View Scheme