1: 3-methyl-cyclohex-2-en-1-one With lithium diisopropyl amide in tetrahydrofuran T=-78°C; 0.5 h; 2: ethyl bromoacetate in tetrahydrofuran T=20°C; 2 h;

1: 3-methyl-cyclohex-2-en-1-one With n-butyllithium; diisopropylamine in tetrahydrofuran T=0°C; 2: With N,N,N',N',N'',N''-hexamethylphosphoric triamide in tetrahydrofuran 3: ethyl bromoacetate With water; ammonium chloride more than 3 stages;