ammonium hydroxide in methanol T=20°C; 24 h;

1: 80 percent / Ph3P; diisopropyl azodicarboxylate / dioxane / 24 h / 20 °C 2: 52 percent / conc. aq. NH3 / methanol / 24 h / 20 °C View Scheme

1: 32 percent / DBU / dimethylformamide / 240 h / 20 °C 2: 80 percent / Ph3P; diisopropyl azodicarboxylate / dioxane / 24 h / 20 °C 3: 52 percent / conc. aq. NH3 / methanol / 24 h / 20 °C View Scheme

1: 89 percent / dimethylformamide / 24 h / 20 °C 2: 80 percent / Ph3P; diisopropyl azodicarboxylate / dioxane / 24 h / 20 °C 3: 52 percent / conc. aq. NH3 / methanol / 24 h / 20 °C View Scheme

1: 62 percent / Ph3P; diisopropyl azodicarboxylate / dioxane / 24 h / 20 °C 2: 82 percent / MeOH / 15 h / Heating 3: 89 percent / DBU / dimethylformamide / 4 h / 20 °C 4: 89 percent / dimethylformamide / 24 h / 20 °C 5: 80 percent / Ph3P; diisopropyl azodicarboxylate / dioxane / 24 h / 20 °C 6: 52 percent / conc. aq. NH3 / methanol / 24 h / 20 °C View Scheme

1: 51 percent / acetic acid / 4 h / Heating 2: 68 percent / conc. aq. NH3 / methanol / 24 h / 20 °C 3: 92 percent / DBU / dimethylformamide / 24 h / 20 °C 4: 66 percent / dioxane / 5 h / Heating 5: 52 percent / conc. aq. NH3 / methanol / 24 h / 20 °C View Scheme

1: 89 percent / DBU / dimethylformamide / 4 h / 20 °C 2: 89 percent / dimethylformamide / 24 h / 20 °C 3: 80 percent / Ph3P; diisopropyl azodicarboxylate / dioxane / 24 h / 20 °C 4: 52 percent / conc. aq. NH3 / methanol / 24 h / 20 °C View Scheme

1: 82 percent / MeOH / 15 h / Heating 2: 89 percent / DBU / dimethylformamide / 4 h / 20 °C 3: 89 percent / dimethylformamide / 24 h / 20 °C 4: 80 percent / Ph3P; diisopropyl azodicarboxylate / dioxane / 24 h / 20 °C 5: 52 percent / conc. aq. NH3 / methanol / 24 h / 20 °C View Scheme

1: 68 percent / conc. aq. NH3 / methanol / 24 h / 20 °C 2: 92 percent / DBU / dimethylformamide / 24 h / 20 °C 3: 66 percent / dioxane / 5 h / Heating 4: 52 percent / conc. aq. NH3 / methanol / 24 h / 20 °C View Scheme