1: With tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran Alkylation; 24 h; Heating; 2: With sodium hydroxide; water Hydrolysis; 3: With water; dihydrogen peroxide; methyltrioxorhenium (VII) in dichloromethane T=20°C; Cyclization; 72 h; Title compound not separated from byproducts;

thallium(III) nitrate in water; acetic acid 3 h; Ambient temperature;