1.1: 86 percent / Mn(OAc)3*2H2O; Cu(OAc)2*H2O / acetic acid / 20 °C 2.1: 85 percent / P4S10 / tetrahydrofuran / Heating 3.1: NaOMe / methanol / 0.5 h / 20 °C 3.2: 68 percent / methanol / 1 h / 90 °C / 15 Torr 4.1: 65 percent / Et3N; CuI; (o-tolyl)3P / Pd(OAc)2 / dimethylformamide 5.1: 29.5 percent / conc. H2SO4; anisole / trifluoroacetic acid / 4 h / 20 °C View Scheme