1: 4-(3,4-dimethoxyphenyl)-3-buten-2-one With sodium hexamethyldisilazane in tetrahydrofuran T=-78°C; 0.5 h; 2: 3,4-dimethoxycinnamic acid chloride in tetrahydrofuran T=-78 - 20°C; 12 h;

1: acetylacetone With diboron trioxide in ethyl acetate T=40°C; Aldol condensation; 0.5 h; 2: 3,4-dimethoxy-benzaldehyde With tributoxyborane in ethyl acetate T=40°C; Aldol condensation; 0.5 h; 3: With N-butylamine in ethyl acetate T=40°C; Aldol condensation; 24.25 h;

potassium carbonate in benzene 24 h; Heating;

potassium carbonate in acetone 5 h; Reflux;

potassium carbonate in acetone 3 h; Reflux;

piperidine; boron triethoxide; boron oxide in 1,4-dioxane

potassium carbonate in water; N,N-dimethyl-formamide T=20°C; 18 h;