1: di-isopropyl azodicarboxylate; triphenylphosphine / diethyl ether / 20 °C / Inert atmosphere 2: PPh3 gold(I) chloro complex; silver trifluoromethanesulfonate / 20 °C / Inert atmosphere View Scheme

Multi-step reaction with 4 steps 1: triethylamine / tetrahydrofuran / 6 h / 20 °C2: copper diacetate; sodium acetate / dimethyl sulfoxide / 12 h / 60 °C / |Sealed tube3: 4-(N,N-dimethlyamino)pyridine / acetonitrile / 2 h / 40 °C / |Sealed tube4: sodium ethanolate / diethyl ether; ethanol / 12 h / 20 °C / |Cooling with ice; |Inert atmosphere  

With  water; sodium hydroxide in  tetrahydrofuran T=50°C; 6 h;