1: 75 percent / pyridine / tetrahydrofuran / 1.5 h / Heating 3: 91 percent / satd. NaHCO3 / ethanol / 2 h / 50 - 60 °C 4: 93 percent / triphenylphosphite methiodide / dimethylformamide / 1.5 h / Ambient temperature 5: 73 percent / tri-n-butyltin hydride / ethanol / 1 h / 50 - 60 °C View Scheme

1: 75 percent / pyridine / tetrahydrofuran / 1.5 h / Heating 3: 91 percent / satd. NaHCO3 / ethanol / 2 h / 50 - 60 °C 4: 93 percent / triphenylphosphite methiodide / dimethylformamide / 1.5 h / Ambient temperature 5: 73 percent / tri-n-butyltin hydride / ethanol / 1 h / 50 - 60 °C 6: 61 percent / HCl; acetic acid / 0.67 h / Heating View Scheme