Sodium Bicarbonate → tert-butyl (1-(2-(7-methoxy-2-oxo-1,5-naphthyridin-1(2H)-yl)ethyl)piperidin-4-yl)carbamate

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Reaction Steps

To 58 mL of chloroform, the obtained (7-methoxy-2-oxo-1,5-naphthyridin-1(2H)-yl)acetaldehyde was dissolved, 2.67 g of tert-butyl (piperidin-4-yl)carbamate and 0.80 g of acetic acid were added, and the mixture was stirred at room temperature for 1.5 hours. To the reaction mixture, 4.23 g of sodium triacetoxyborohydride was added, and the mixture was stirred for 15 hours. Thereto was added a saturated aqueous sodium hydrogen carbonate solution, and the organic layer was separated. The organic layer 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 silica gel; Silica Gel 60N made by KANTO CHEMICAL CO., INC. and an eluent of chloroform:methanol=10:1 to obtain 4.36 g of tert-butyl (1-(2-(7-methoxy-2-oxo-1,5-naphthyridin-1(2H)-yl)ethyl)piperidin-4-yl)carbamate as a white solid.

Provenance & Evidence