1: pyridine; copper diacetate; lead(IV) tetraacetate / toluene / 1 h / |Reflux 2: potassium carbonate / methanol / 1 h / 20 °C 3: triphenylphosphine; diethylazodicarboxylate / tetrahydrofuran / 3.5 h / -23 °C 4: hydrogenchloride / methanol; tetrahydrofuran / 2 h / 20 °C 5: hydrogenchloride; water / tetrahydrofuran / 6 h / |Reflux View Scheme

1: pyridine; copper diacetate; lead(IV) tetraacetate / toluene / 1 h / |Reflux 2: potassium carbonate / methanol / 1 h / 20 °C 3: triphenylphosphine; diethylazodicarboxylate / tetrahydrofuran / 3.5 h / -23 °C 4: hydrogenchloride / methanol; tetrahydrofuran / 2 h / 20 °C 5: hydrogenchloride; water / tetrahydrofuran / 6 h / |Reflux View Scheme

1: pyridine; copper diacetate; lead(IV) tetraacetate / toluene / 1 h / |Reflux 2: potassium carbonate / methanol / 1 h / 20 °C View Scheme