1: 89 percent / imidazole / dimethylformamide / 24 h / Ambient temperature 2: 87 percent / triethylamine, 4-(N,N-dimethylamino)pyridine / CH2Cl2 / 5 h / -15 - 23 °C 3: 82 percent / sodium hydride / tetrahydrofuran / 3 h / Ambient temperature 4: 88 percent / hydrogen / Pd/C / ethyl acetate / 4 h 5: 93 percent / tetrabutylammonium fluoride monohydrate / tetrahydrofuran / 1 h / Ambient temperature 6: 71 percent / pyridinium dichromate / dimethylformamide / 24 h View Scheme

1: 89 percent / imidazole / dimethylformamide / 24 h / Ambient temperature 2: 87 percent / triethylamine, 4-(N,N-dimethylamino)pyridine / CH2Cl2 / 5 h / -15 - 23 °C 3: 82 percent / sodium hydride / tetrahydrofuran / 3 h / Ambient temperature 4: 88 percent / hydrogen / Pd/C / ethyl acetate / 4 h 5: 93 percent / tetrabutylammonium fluoride monohydrate / tetrahydrofuran / 1 h / Ambient temperature 6: 71 percent / pyridinium dichromate / dimethylformamide / 24 h View Scheme