1: 4-methoxy-benzaldehyde; anhydrous diethyl succinate With sodium ethanolate in ethanol T=40 - 50°C; 4.75 h; Heating / reflux; 2: With hydrogenchloride; ethanol; water 3: sodium acetate; acetic anhydride 3 h; Heating / reflux;

1: sodium ethoxide / ethanol / 4 h / Heating 2: sodium acetate / 3 h / Heating View Scheme

sodium acetate 3 h; Heating;

1: TFA; water / 1.5 h / 20 °C 2: KOAc / 1.5 h / Heating View Scheme

acetic anhydride Friedel-Crafts acylation;

potassium carbonate in methanol T=20°C; 1.5 h;