1: 76 percent / TiCl4 / CH2Cl2 / -78 °C 2: 71 percent / O2 / PdCl2, CuCl / dimethylformamide; H2O 3: 1.) KH, TMSCl, 2.) Et3N / 2.) Pd(OAc)2 / 2.) CH3CN 4: 76 percent / Na(Hg), Na2HPO4 / methanol / 0.17 h / -40 °C View Scheme