1: zinc; NaOD / water-d2 / 72 h / |Reflux 2: pyridine / tetrahydrofuran / 0 - 20 °C / |Inert atmosphere 3: N-chloro-succinimide; oxygen; copper dichloride / acetonitrile / 1 h / 100 °C / 760.05 Torr 4: magnesium / methanol / 20 °C / |Sonication View Scheme