1.1: LiAlH4 / diethyl ether / 0 °C 2.1: pyridine 3.1: Mg / tetrahydrofuran / 20 °C 3.2: CuI / tetrahydrofuran / -78 °C 3.3: tetrahydrofuran 4.1: TsOH / methanol 4.2: tetracyanoethylene / tetrahydrofuran View Scheme