反应详情

(2-Ethoxy)-acetyl chloride [(1.72 g, 13.99 mmol), Tett. Lett., 35, (39), 7269; 1994)] was added to an ice-cold solution of 6-chloronicotinic acid hydrazide (2 g, 11.66 mmol) and N-methylmorpholine (1.92 mL, 17.49 mmol) in dichloromethane (60 mL) and the mixture was stirred at room temperature for 18 hours. The mixture was then washed with citric acid, sodium hydrogen carbonate solution and brine and the solvent was evaporated under reduced pressure to yield some title product as a white solid, 880 mg. The combined aqueous washings were extracted with ethyl acetate (×2) and the combined organic solutions were dried over sodium sulfate and concentrated in vacuo to afford a further crop of title compound as a pale yellow solid, 1.6 g (total yield of 83%).

1. washThe mixture was then washed with citric acid, sodium hydrogen carbonate solution and brine
2. customthe solvent was evaporated under reduced pressure