1: sodium tetrahydroborate / methanol / 0.5 h / 0 °C 2: triethylamine / dichloromethane / 0 - 20 °C / Inert atmosphere 3: N,N,N',N',N'',N''-hexamethylphosphoric triamide; samarium diiodide / tetrahydrofuran / 3 h / 0 °C / Inert atmosphere View Scheme