1: 99 percent / Bu3SnH, AIBN / benzene / 6 h / Heating 2: 75 percent / NaOMe / methanol / 3 h / 0 °C 3: CF3SO3H / cyclohexane; CH2Cl2 / 0.5 h / Ambient temperature 4: TFA / CH2Cl2 / 22 h / Ambient temperature View Scheme