cerium(III) chloride; methyllithium in tetrahydrofuran; diethyl ether T=-78°C; 1.5 h;

1: methyllithium With cerium(III) chloride in tetrahydrofuran; diethyl ether T=-78°C; 2 h; 2: (E)-1,8-dimorpholinooct-4-ene-1,8-dione in tetrahydrofuran; diethyl ether T=-78°C; 1.5 h; Further stages.;