反应详情

(5,7-Difluoro-2-oxo-1(2H)-quinolinyl)acetaldehyde (2.1 g; 9.4 mmol) and 1,1-dimethylethyl 4-piperidinylcarbamate (2.82 g; 14.1 mmol) were dissolved in a 1:1 mixture of chloroform and MeOH (60 ml:60 ml) and stirred at rt for 1 h. This was then treated with NaBH(OAc)3 (8.92 g; 42.3 mmol) and stirred for a further 1 h. More 1,1-dimethylethyl 4-piperidinylcarbamate (470 mg; 2.35 mmol) was added and the reaction stirred under the same conditions for 20 mins, this was then treated with NaBH(OAc)3 (1.98 g; 9.4 mmol) and stirred for 25 mins. More 1,1-dimethylethyl 4-piperidinylcarbamate (470 mg; 2.35 mmol) was then added and the reaction stirred for 20 mins. More NaBH(OAc)3 (500 mg; 2.38 mmol) was then added to the reaction and it was stirred overnight at rt. The solvents were then removed and the crude residue purified by column chromatography on silica gel using a 0-15% MeOH/DCM gradient to give the desired product (2 g; 52%).

1. stirringstirred for a further 1 h
2. stirringthe reaction stirred under the same conditions for 20 mins
3. stirringstirred for 25 mins
4. stirringthe reaction stirred for 20 mins
5. stirringwas stirred overnight at rt
6. customThe solvents were then removed
7. customthe crude residue purified by column chromatography on silica gel using a 0-15% MeOH/DCM gradient