1: With sodium hydride; tetrakis(triphenylphosphine) palladium(0) in dichloromethane T=20°C; 2: With Grubb's 2nd generation catalyst in dichloromethane 4 h; Heating; Further stages.;

silver hexafluoroantimonate; PPh3 gold(I) chloro complex in dichloromethane T=20°C; 2 h; Inert atmosphere; regioselective reaction;

potassium carbonate in methanol T=25°C; 96 h; Yield given. Yields of byproduct given;