1: 70 percent / trifluoroacetic acid / 2.5 h / Heating 2: 67 percent / lithium aluminum hydride / diethyl ether / 2.3 h / Heating 3: 1.) sec-butyllithium / 1.) THF, -78 deg C, 30 min, 2.) THF, -78 deg C, 15 min 4: 56 percent / Swern oxidation View Scheme

Multi-step reaction with 2 steps 1: 70 percent / trifluoroacetic acid / 2.5 h / Heating2: 67 percent / lithium aluminum hydride / diethyl ether / 2.3 h / Heating