1: 4-hydroxy-6-methyl-2H-pyran-2-one With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 1 h; 2: benzyl chloride in tetrahydrofuran; hexane T=20°C; Further stages.;

n-butyllithium; diisopropylamine in tetrahydrofuran; hexane; dichloromethane

hydrogenchloride 18 h; Ambient temperature;

N,N,N',N',N'',N''-hexamethylphosphoric triamide; lithium diisopropyl amide 1.) THF, hexane, 0 deg C, 30 min, 2.) THF, hexane, 0 deg C, 60 min; Yield given. Multistep reaction;