silver hexafluoroantimonate; PPh3 gold(I) chloro complex in dichloromethane; water T=35°C; 24 h;

Li2CuCl4 in dichloromethane; water T=35°C; 48 h;

1: NaH / tetrahydrofuran 2: SO3*pyridine; triethylamine / dimethylsulfoxide; CH2Cl2 3: Zn; 1,2-diiodoethane / tetrahydrofuran / sonication 4: NaH / tetrahydrofuran 5: aq. HCl / tetrahydrofuran 6: 100 percent Chromat. / AgSbF5 / Ph3AuCl / CH2Cl2; H2O / 24 h / 35 °C View Scheme

1: Zn; 1,2-diiodoethane / tetrahydrofuran / sonication 2: NaH / tetrahydrofuran 3: aq. HCl / tetrahydrofuran 4: 100 percent Chromat. / AgSbF5 / Ph3AuCl / CH2Cl2; H2O / 24 h / 35 °C View Scheme

zinc(II) chloride in dichloromethane T=-25°C; 4 h;

zinc(II) iodide in diethyl ether T=22°C; 2 h;

1: SO3*pyridine; triethylamine / dimethylsulfoxide; CH2Cl2 2: Zn; 1,2-diiodoethane / tetrahydrofuran / sonication 3: NaH / tetrahydrofuran 4: aq. HCl / tetrahydrofuran 5: 100 percent Chromat. / AgSbF5 / Ph3AuCl / CH2Cl2; H2O / 24 h / 35 °C View Scheme

T=130°C; 2.5 h;

1.1: n-butyllithium / tetrahydrofuran; hexane / 1 h / -78 °C / |Inert atmosphere 1.2: 18 h / -78 - 20 °C / |Inert atmosphere 2.1: 4-(N,N-dimethlyamino)pyridine / pyridine; dichloromethane / 0 - 20 °C / |Inert atmosphere 3.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 0 - 20 °C / |Inert atmosphere 4.1: [Au(NTf)2(Si-dtbm)] / dichloromethane / 3 h / -40 °C / |Inert atmosphere View Scheme

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