1: acetonitrile With n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=-78°C; 1 h; 2: methyl vinyl ketone in tetrahydrofuran T=-78°C; 3 h;

triethylamine in tetrahydrofuran 4 h; Heating;

18-crown-6 ether in acetonitrile 1.) 4 h, reflux; 2.) 60 h at 20 deg C;