1: 1.) aq. HCl, 2.) LiOH / 1.) THF, room temperature, 14 h, 2.) H2O, MeOH, room temperature, 10 h 2: 1.) Et3N, 2,4,6-trichlorobenzoyl chloride, 2.) N,N-dimethylaminopyridine / 1.) THF, room temperature, 6 h, 2.) toluene, reflux, 14 h 3: 85 percent / TiCl4 / CH2Cl2 / 2 h / 0 °C View Scheme