Chloroform → tert-Butyl {1-[2-(7-fluoro-2-oxoquinolin-1(2H)-yl)ethyl]piperidin-4-yl}carbamate

Participants

Reaction Steps

A mixture of (7-fluoro-2-oxo-1(2H)-quinolinyl)acetaldehyde (594 mg; 2.89 mmol) and 1,1-dimethylethyl 4-piperidinylcarbamate (578 mg; 2.89 mmol) in a 1:1 mixture of chloroform and methanol (20 ml:20 ml) was stirred at rt under argon for 1 h. The mixture was then treated with NaBH(OAc)3 (1.83 g; 8.67 mmol) and stirred at rt for a 1 h. More 1,1-dimethylethyl 4-piperidinylcarbamate (297 mg; 1.45 mmol) was added and the reaction was stirred under the same conditions for a further 0.5 h. This was then again treated with NaBH(OAc)3 (915 mg; 4.34 mmol) and stirred at rt for a further 0.75 h. More 1,1-dimethylethyl 4-piperidinylcarbamate (118 mg; 0.578 mmol) was then added, the reaction was stirred at rt for a further 10 mins, followed by addition of NaBH(OAc)3 (366 mg; 1.73 mmol), the reaction was stirred for a further 25 mins. The solvents were removed and the crude residue purified by chromatography on silica gel using a 010% MeOH/DCM gradient to provide the impure desired compound (1.32 g, 117%)

Provenance & Evidence