1: 4,5-dihydro-2,4,4-trimethyloxazole With lithium diisopropyl amide in tetrahydrofuran T=-98°C; 0.333333 h; 2: N-lt;(4-Chlorophenyl)methylenegt;-2-methyl-2-propanamine N-oxide in tetrahydrofuran T=-98 - 20°C;

in tetrahydrofuran T=-98°C; 18 h;

lithium diisopropyl amide in tetrahydrofuran T=-98°C;

lanthanum trifluoromethanesulphonate in dichloromethane T=20°C; 8 h;