1: lithium aluminium tetrahydride / tetrahydrofuran / 0.33 h / Inert atmosphere 2: 1,8-diazabicyclo[5.4.0]undec-7-ene; 5-hydro-3-oxaoctafluoropentanesulfonyl fluoride / tetrahydrofuran / 0.08 h / Inert atmosphere View Scheme