lithium diisopropyl amide in tetrahydrofuran T=0 - 20°C; 10 h;

1: (5R)-2,6-dimethyl-5-(1-methylethenyl)-2-cyclohexen-1-one With lithium diisopropyl amide in tetrahydrofuran; hexane T=-10°C; 2 h; 2: methyl iodide in tetrahydrofuran; hexane T=20°C;