1: ortho-N-trimethylsilyl-toluidine With n-butyllithium in tetrahydrofuran; hexane Heating; 2: 2,2-dimethyl-pent-4-enoic acid methyl ester in tetrahydrofuran; hexane T=20°C;

1: 55 percent / KOH / acetone / 20 °C 2: 89 percent / PtCl2; HCl / dioxane / 47 h / 90 °C View Scheme

potassium hydroxide in acetone T=20°C;