1: ammonium acetate / 100 °C 2: lithium aluminium tetrahydride / diethyl ether; tetrahydrofuran / 6 h / 20 °C / |Cooling with ice 3: acetic anhydride / 2 h / 20 °C 4: lithium aluminium tetrahydride / tetrahydrofuran / 48 h / 20 °C / |Cooling with ice 5: n-butyllithium; diisopropylamine; 2,2-bis[2-(4(S)-isobutyl-1,3-oxazolinyl)]propane / hexane; toluene / 26 h / -78 - -30 °C / |Inert atmosphere View Scheme