1: N,N-diisopropylethylamine / CH2Cl2 / 1 h / Ambient temperature 2: 76 percent / NaBH4 / tetrahydrofuran; various solvent(s) / 3 h / Ambient temperature 3: 75 percent / pyridinium dichromate / dimethylformamide / Ambient temperature 4: 95 percent / H2 / 5percent Pd/C / methanol / 1 h / Ambient temperature 5: 94 percent / 1 M aq. HCl / 1 h / Ambient temperature View Scheme