1: acetylacetone With ethanol; sodium ethanolate 2: (Z,Z)-2,2'-thiobis(1,3-diphenylprop-2-en-1-one) in ethanol; N,N-dimethyl-formamide T=20°C; 1 h; stereoselective reaction;

1: ethyl acetoacetate With ethanol; sodium ethanolate 2: (Z,Z)-2,2'-thiobis(1,3-diphenylprop-2-en-1-one) in ethanol; N,N-dimethyl-formamide T=20°C; 1 h; stereoselective reaction;