1: 95 percent / LiAlH4 / diethyl ether / 1.) reflux, 1 h; 2.) RT, 10 h 2: 73 percent / oxalyl chloride, DMSO, NEt3 / CH2Cl2 / 1 h / -78 °C View Scheme

lithium aluminium tetrahydride in diethyl ether 1.) reflux, 1 h; 2.) RT, 10 h;