1: 1-phenyl-2-butanone With N,N'-dimethyl-N,N'-propyleneurea; lithium diisopropyl amide in tetrahydrofuran T=-78°C; 2 h; 2: N-phenyl-1,1,1-trifluoromethanesulfonamide in tetrahydrofuran T=0°C; 9 h;