1: 91.4 percent / i-Bu2AlH / toluene / 0.5 h / -20 °C 2: 1.) Li, NH3, 2.) (CO2H)2*H2O / 1) EtOH, Et2O-THF, -75 deg C, 0.5 h, 2) aq.MeOH, 50 deg C, 2 h; room temp., overnight View Scheme