1: (3S)-3,5-dimethylhepta-4,6-dien-2-one With lithium diisopropyl amide in tetrahydrofuran T=-70°C; enolation; 0.0833333 h; 2: 4-(2-0xoethyl)-2,6-piperidinedione in tetrahydrofuran aldolisation; 0.5 h;