1: 90 percent / MnO2 / dioxane / 5 h / Heating 2: 95 percent / tetrahydrofuran / 2 h / Ambient temperature 3: 1.) trifluoroacetic acid, triethylsilane, 2.) H2 / Pd/C / 1.) r.t., CH2Cl2, 2.) r.t., 1 bar, 2 h, H2O View Scheme

1: 90 percent / MnO2 / dioxane / 5 h / Heating 2: 95 percent / tetrahydrofuran / 2 h / Ambient temperature 3: 1.) trifluoroacetic acid, triethylsilane, 2.) H2 / Pd/C / 1.) r.t., CH2Cl2, 2.) r.t., 1 bar, 2 h, H2O View Scheme

manganese(IV) oxide in 1,4-dioxane 5 h; Heating;

1: 4-iodo-1-triphenylmethyl-1H-imidazole With iso-propylmagnesium bromide in tetrahydrofuran; dichloromethane T=10 - 20°C; 1 h; 2: 2,3-dimethylbenzaldehyde in tetrahydrofuran; dichloromethane T=10 - 25°C; 1 h;

iodine; magnesium 1.) THF, reflux, 1 h, 2.) r.t., THF, 1.5 h; Yield given. Multistep reaction;

1: 90 percent / MnO2 / dioxane / 5 h / Heating 2: 95 percent / tetrahydrofuran / 2 h / Ambient temperature View Scheme