1: 8 percent / 1.) NaBH4, 2.) trifluoroacetic anhydride / 1.) NaBH4, ethanol, 2.) trifluoroacetic anhydride, benzene 2: 55 percent / KOH / tetrahydrofuran; H2O; dimethylsulfoxide / 1.) aq. KOH, THF, room temperatures, 20h, 2.) DMSO, 50 deg. C, 1h View Scheme