tin(IV) chloride in dichloromethane 2 h;

1: 64 percent / 0.1 M HCl / 15 h / Heating 2: 91 percent / pyridine, 4-(dimethylamino)pyridine / 1.5 h / Ambient temperature 3: 67 percent / triethylamine / CH2Cl2 / 24 h / Heating 4: 99 percent / NH3 (g), CH3OH / 16 h / Ambient temperature 5: 60 percent / 1 M NBu4F / tetrahydrofuran / 18 h / Heating 6: 45 percent / SnCl4 / CH2Cl2 / 2 h View Scheme

1: 91 percent / pyridine, 4-(dimethylamino)pyridine / 1.5 h / Ambient temperature 2: 67 percent / triethylamine / CH2Cl2 / 24 h / Heating 3: 99 percent / NH3 (g), CH3OH / 16 h / Ambient temperature 4: 60 percent / 1 M NBu4F / tetrahydrofuran / 18 h / Heating 5: 45 percent / SnCl4 / CH2Cl2 / 2 h View Scheme

1: 67 percent / triethylamine / CH2Cl2 / 24 h / Heating 2: 99 percent / NH3 (g), CH3OH / 16 h / Ambient temperature 3: 60 percent / 1 M NBu4F / tetrahydrofuran / 18 h / Heating 4: 45 percent / SnCl4 / CH2Cl2 / 2 h View Scheme

1: 60 percent / 1 M NBu4F / tetrahydrofuran / 18 h / Heating 2: 45 percent / SnCl4 / CH2Cl2 / 2 h View Scheme

1: 99 percent / NH3 (g), CH3OH / 16 h / Ambient temperature 2: 60 percent / 1 M NBu4F / tetrahydrofuran / 18 h / Heating 3: 45 percent / SnCl4 / CH2Cl2 / 2 h View Scheme

1: 38 percent / K2CO3 / dimethylformamide / 18 h / Ambient temperature 2: 64 percent / 0.1 M HCl / 15 h / Heating 3: 91 percent / pyridine, 4-(dimethylamino)pyridine / 1.5 h / Ambient temperature 4: 67 percent / triethylamine / CH2Cl2 / 24 h / Heating 5: 99 percent / NH3 (g), CH3OH / 16 h / Ambient temperature 6: 60 percent / 1 M NBu4F / tetrahydrofuran / 18 h / Heating 7: 45 percent / SnCl4 / CH2Cl2 / 2 h View Scheme

1: 47 percent / CH2Cl2 / 72 h / Ambient temperature 2: 64 percent / 0.1 M HCl / 15 h / Heating 3: 91 percent / pyridine, 4-(dimethylamino)pyridine / 1.5 h / Ambient temperature 4: 67 percent / triethylamine / CH2Cl2 / 24 h / Heating 5: 99 percent / NH3 (g), CH3OH / 16 h / Ambient temperature 6: 60 percent / 1 M NBu4F / tetrahydrofuran / 18 h / Heating 7: 45 percent / SnCl4 / CH2Cl2 / 2 h View Scheme