1: hexanoic acid methyl ester With lithium diisopropyl amide in tetrahydrofuran; hexane T=-78°C; 0.5 h; 2: chloro-trimethyl-silane in tetrahydrofuran; hexane T=-78 - 60°C; 1.5 h;

1: With titanium tetrachloride in dichloromethane T=-60 - -20°C; 2: With toluene-4-sulfonic acid in dichloromethane T=20°C;

indium tribromide; trimethoxy silane in dichloromethane T=20°C; cross Claisen condensation; 3 h;

zinc(II) chloride in dichloromethane 6 h; Heating;