1.1: sodium amide / tetrahydrofuran / |Reflux; |Inert atmosphere; |Cooling with ice 2.1: sodium hydride / tetrahydrofuran / 1 h / 20 °C 2.2: 3 h / 20 °C 3.1: sodium tetrahydroborate / methanol / 13 h / 20 °C / |Irradiation View Scheme