sulfuric acid; iodine in dimethyl sulfoxide T=60°C; 0.5 h; Acidic conditions;

iodine in dimethyl sulfoxide Acidic conditions;

n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=-60 - 20°C; 2 h;

1: 100 percent / HCl / 1 h / Heating 2: 78 percent / butyllithium; diisopropylamine / tetrahydrofuran; hexane / 2 h / -60 - 20 °C View Scheme

4-(N,N-dimethlyamino)pyridine 4.5 h; Reflux;

1: C11H10(2)H2O2; allyl 4-chlorophenylacetate With lithium diisopropyl amide in tetrahydrofuran T=-78°C; 2: With tris(dibenzylideneacetone)dipalladium(0) chloroform complex; lithium chloride in tetrahydrofuran T=-78°C; 3: diazomethyl-trimethyl-silane Further stages;

Multistep reaction;