Acetic Acid → tert-butyl (1-(2-(7-methoxy-2-oxo-1,8-naphthyridin-1(2H)-yl)ethyl)piperidin-4-yl)carbamate

Participants

Reaction Steps

To a solution of 1.6 g of (7-methoxy-2-oxo-1,8-naphthyridin-1(2H)-yl)acetaldehyde in 70 mL of dichloromethane, 1.5 g of tert-butyl (piperidin-4-yl)carbamate and 0.42 mL of acetic acid were added, the mixture was stirred for 20 minutes, then 2.3 g of sodium triacetoxyborohydride was added to the reaction mixture and the mixture was stirred at room temperature for 2 hours 10 minutes. Thereto were added water, a saturated aqueous sodium hydrogen carbonate solution and chloroform, the organic layer was separated, and the aqueous layer was extracted with chloroform. The organic layer and the extract were combined, the resultant solution was washed with a saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The resultant residue was purified by silica gel column chromatography using an eluent of chloroform:methanol=50:1 to obtain 2.8 g of tert-butyl (1-(2-(7-methoxy-2-oxo-1,8-naphthyridin-1(2H)-yl)ethyl)piperidin-4-yl)carbamate as a white foam.

Provenance & Evidence