1.1: pyridine / dichloromethane / 2 h / 10 - 12 °C 2.1: potassium carbonate; sodium iodide / butanone / 0.17 h / 20 °C 2.2: 5 h / 80 - 90 °C 3.1: sodium hydroxide / methanol / 1 h / |Reflux 4.1: borane-THF / tetrahydrofuran / 1.25 h / 0 °C / |Reflux View Scheme