1: Et3N / tetrahydrofuran / 2 h / 20 °C 2: p-toluenesulfonic acid hydrate / acetone; H2O / 6 h / 40 °C 3: 1.73 g / Et3N / CH2Cl2 / 2 h / 20 °C 4: 78 percent / PPh3; Pd(OAc)2; HCOOH / dimethylformamide / 5 h / 80 °C View Scheme

1.1: triethylamine / dichloromethane / 2 h / 20 °C / Cooling with ice 2.1: sodium hydride / tetrahydrofuran; mineral oil / 0.5 h / Cooling with ice 2.2: 2 h / 20 °C 3.1: tris(dibenzylideneacetone)dipalladium(0) chloroform complex; tris-(o-tolyl)phosphine / tetrahydrofuran; hexane / 0.67 h / 20 - 60 °C / Inert atmosphere 4.1: (1S)-10-camphorsulfonic acid / methanol; dichloromethane / 24 h / 20 °C / Inert atmosphere 5.1: (CuOTf)2*C6H5CH3 / acetonitrile / 1 h / 20 °C 6.1: pyridinium chlorochromate / dichloromethane / 3 h / 20 °C 7.1: diphenyl diselenide; dihydrogen peroxide / dichloromethane / 24 h / 20 °C / Inert atmosphere 7.2: 16 h 8.1: diphenyl diselenide; dihydrogen peroxide / dichloromethane / 48 h / 20 °C / Inert atmosphere 8.2: 16 h 9.1: palladium 10 on activated carbon; hydrogen / ethyl acetate / 1 h / 20 °C / 760.05 Torr View Scheme

1: Et3N / tetrahydrofuran / 2 h / 20 °C 2: p-toluenesulfonic acid hydrate / acetone; H2O / 6 h / 40 °C 3: 1.73 g / Et3N / CH2Cl2 / 2 h / 20 °C 4: 4 percent / PPh3; Pd(OAc)2; HCOOH / dimethylformamide / 5 h / 80 °C View Scheme

1: Et3N / tetrahydrofuran / 2 h / 20 °C 2: p-toluenesulfonic acid hydrate / acetone; H2O / 6 h / 40 °C 3: 1.73 g / Et3N / CH2Cl2 / 2 h / 20 °C 4: 98 percent / Pd(PPh3)4 / tetrahydrofuran / 1 h / 80 °C View Scheme

1: Et3N / tetrahydrofuran / 2 h / 20 °C 2: p-toluenesulfonic acid hydrate / acetone; H2O / 6 h / 40 °C 3: 1.73 g / Et3N / CH2Cl2 / 2 h / 20 °C 4: 60 percent / Pd(PPh3)4 / tetrahydrofuran / 2 h / 80 °C View Scheme