1: potassium tert-butylate; pyridine; sodium carbonate; CuI / ethylene glycol dimethyl ether; 2-iodophenol 2: N-bromosuccinmide / water; 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran 3: acetic acid / Pt/C; palladium monocarbide / ethyl acetate; ethanol 4: potassium permanganate / Montmorillonite / ethyl acetate; acetonitrile; nitrogen View Scheme

pyridine; CuI; potassium tert-butylate; sodium carbonate in ethylene glycol dimethyl ether; 2-iodophenol