Dimethylformamide → tert-Butyl{1-[2-(7-chloro-2-oxo-1,8-naphthyridin-1(2H)-yl)ethyl]piperidin-4-yl}carbamate

Participants

Reaction Steps

A solution of 7-chloro-1,8-naphthyridin-2(1H)-one [J. Org. Chem. 1990, 55, 4744-4750] in dry DMF (20 mL) (540 mg, 3.0 mmol) at 0° C. was treated with sodium hydride (144 mg, 60% in mineral oil, 3.6 mmol). The reaction mixture was allowed to warm to room temperature and stirred for 1 hour. The reaction was cooled using an ice bath. A solution of 2-{4-[(tert-butoxycarbonyl)amino]piperidin-1yl}ethyl methanesulfonate in DMF (Intermediate 6), 0.33 mmol/mL, 10 mL, 3.3 mmol) was then added over 1 hour. The reaction was allowed to warm to room temperature and stirred overnight. The reaction mixture was diluted with water and extracted with dichloromethane (3×50 mL). The combined organic layers were washed with saturated sodium chloride solution (3×10 mL), dried over sodium sulfate and evaporated. Chromatography on silica gel using methanol in dichloromethane (0-15%) gave the title compound as a brown foam (711 mg, 58%).

Provenance & Evidence