1: 90 percent / NaH / tetrahydrofuran / 3 h / Ambient temperature 2: p-TSA / benzene / 0.03 h / Heating View Scheme

Multi-step reaction with 5 steps 1: 95 percent / benzene / 40 h / Heating2: 95 percent / DDQ3: 1.) PhSeCl; 2.) 30percent H2O2-AcOH / 1.) CH2Cl2, RT, 20 h4: 57percent HI5: 68 percent / Zn, TMSCl / tetrahydrofuran / 2 h / Heating