Hg(OTf)2 in benzene T=20°C; 6 h; Title compound not separated from byproducts;

triphenylphosphine; bis(dibenzylideneacetone)-palladium(0) T=100°C; 6 h;

1.1: 1,2-dihydrofuran; methanesulfonic acid / dichloromethane / 4 h / -20 °C / Cooling with ice 1.2: 18 h / -20 - 20 °C / Inert atmosphere 2.1: sodium carbonate; 3-chloro-benzenecarboperoxoic acid / dichloromethane / 21 °C / Inert atmosphere; Cooling with ice 3.1: boron trifluoride diethyl etherate / chloroform / 1.5 h / Cooling with ice; Inert atmosphere View Scheme

1.1: silica gel / Microwave irradiation 2.1: 1,2-dihydrofuran; methanesulfonic acid / dichloromethane / 4 h / -20 °C / Cooling with ice 2.2: 18 h / -20 - 20 °C / Inert atmosphere 3.1: sodium carbonate; 3-chloro-benzenecarboperoxoic acid / dichloromethane / 21 °C / Inert atmosphere; Cooling with ice 4.1: boron trifluoride diethyl etherate / chloroform / 1.5 h / Cooling with ice; Inert atmosphere View Scheme

1: sodium carbonate; 3-chloro-benzenecarboperoxoic acid / dichloromethane / 21 °C / Inert atmosphere; Cooling with ice 2: boron trifluoride diethyl etherate / chloroform / 1.5 h / Cooling with ice; Inert atmosphere View Scheme