sodium bis(2-methoxyethoxy)aluminium dihydride in diethyl ether T=0°C;

AlCl3, aluminium chloride; lithium aluminium tetrahydride in diethyl ether T=0 - 20°C;

1: 73 percent / n-BuLi / tetrahydrofuran / -30 deg C up to RT 2: 73 percent / REDAL / diethyl ether / 0 °C View Scheme

1: 76 percent / imidazole / dimethylformamide / Ambient temperature 2: 73 percent / n-BuLi / tetrahydrofuran / -30 deg C up to RT 3: 73 percent / REDAL / diethyl ether / 0 °C View Scheme