tin(IV) chloride in dichloromethane 2 h;

With  tetrabutyl ammonium fluoride in  tetrahydrofuran 18 h;  Heating;   

Multi-step reaction with 5 steps 1: 64 percent / 0.1 M HCl / 15 h / Heating2: 91 percent / pyridine, 4-(dimethylamino)pyridine / 1.5 h / Ambient temperature3: 67 percent / triethylamine / CH2Cl2 / 24 h / Heating4: 99 percent / NH3 (g), CH3OH / 16 h / Ambient temperature5: 60 percent / 1 M NBu4F / tetrahydrofuran / 18 h / Heating  

Multi-step reaction with 4 steps 1: 91 percent / pyridine, 4-(dimethylamino)pyridine / 1.5 h / Ambient temperature2: 67 percent / triethylamine / CH2Cl2 / 24 h / Heating3: 99 percent / NH3 (g), CH3OH / 16 h / Ambient temperature4: 60 percent / 1 M NBu4F / tetrahydrofuran / 18 h / Heating  

Multi-step reaction with 3 steps 1: 67 percent / triethylamine / CH2Cl2 / 24 h / Heating2: 99 percent / NH3 (g), CH3OH / 16 h / Ambient temperature3: 60 percent / 1 M NBu4F / tetrahydrofuran / 18 h / Heating  

Multi-step reaction with 2 steps 1: 99 percent / NH3 (g), CH3OH / 16 h / Ambient temperature2: 60 percent / 1 M NBu4F / tetrahydrofuran / 18 h / Heating