diisobutylaluminium hydride in tetrahydrofuran T=20°C; Reduction;

1: 83 percent / DMAP / CH2Cl2 / 1 h / 20 °C 2: 92 percent / 20 h / Thermolysis 3: 87 percent / diisobutylaluminum hydride / various solvent(s); tetrahydrofuran / 20 °C View Scheme