1: 87 percent / K2CO3, NaI, CuI / dimethylformamide / 28 h / Ambient temperature 2: 73 percent / TBAF / tetrahydrofuran / 1.1 h / -20 °C View Scheme

2: 8.3 g / p-toluenesulfonic acid / methanol / 2 h / 20 °C 3: CrO3 - 1,5M H2SO4 / acetone / 1.)0 deg C, 2.)20 deg C, 2 h 4: 64 percent / H2O, conc. HCl / tetrahydrofuran / 24 h / 20 °C 5: H2 / P-2 nickel / ethanol 6: 27 percent / Triethylamine, 2-Chloro-1-methylpyridinium iodide / acetonitrile / Heating View Scheme